United States
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

xANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 20172020
or
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission File Number: 001-37822
¨TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission File Number: 001-37822
 
Advanced Emissions Solutions, Inc.
(Name of registrant as specified in its charter)
Delaware
27-5472457
Delaware27-5472457
(State of incorporation)
(IRS Employer

Identification No.)
640 Plaza Drive,8051 E. Maplewood Ave, Suite 270, Highlands Ranch,210, Greenwood Village, CO, 8012980111
(Address of principal executive offices) (Zip Code)
(Registrant’s telephone number, including area code): (720)(720) 598-3500
Securities registered under Section 12(b) of the Act:
Title of each classClassTrading SymbolName of each exchange on which registered
Common Stock, $0.001stock, par value $0.001 per shareADESNASDAQ Global Market

Securities registered under Section 12(g) of the Act: None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    ¨  Yes    x  No
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.    ¨  Yes    x  No
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    x  Yes    ¨  No
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    x  Yes    ¨  No
Indicate by check mark if disclosure of delinquent filers in response to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definition of “large"large accelerated filer,” “accelerated filer”" "accelerated filer" and “smaller"smaller reporting company”company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer¨Accelerated filerx¨
Non-accelerated filer¨xSmaller Reporting Company¨
Emerging growth company
¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☐ 
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act.)    ¨  Yes    x  No

The aggregate market value of the voting stock held by non-affiliates of the registrant was approximately $114.3$86.1 million based on the last reported bid price of the Common Stock on the NASDAQ Global Market on June 30, 2017.2020.  The number of shares outstanding of the registrant’s Common Stock, par value $0.001 per share, as of March 2, 20181, 2021 was 20,752,939.
Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date.18,518,846.
 
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Documents Incorporated By Reference
Portions of Part III of this Form 10-K are incorporated by reference from the Registrant's definitive proxy statement to be filed with the Securities and Exchange Commission no later than 120 days after the end of the Registrant's fiscal year.



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ADVANCED EMISSIONS SOLUTIONS, INC.
ANNUAL REPORT ON FORM 10-K
FOR THE FISCAL YEAR ENDED DECEMBER 31, 20172020


TABLE OF CONTENTS









PART I
Item 1. Business
General
ADA-ES, Inc. (“ADA”("ADA"), a Colorado corporation, was incorporated in 1997. Pursuant to an Agreement and Plan of Merger, ("Reorganization"), effective July 1, 2013, Advanced Emissions Solutions, Inc. (“ADES”("ADES"), a Delaware company incorporated in 2011, replacedsucceeded ADA as the publicly-held corporation and ADA became a wholly-owned subsidiary of ADES. Each outstanding share of ADA’s common stock automatically convertedIn 2018, ADA acquired ADA Carbon Solutions, LLC ("Carbon Solutions"). We acquired Carbon Solutions to enter into one share of common stock of ADESthe broader activated carbon ("AC") market and to expand our product offerings in the shareholders of ADA became stockholders of ADES on a one-for-one basis, holding the same number of shares inmercury control industry and the same ownership percentage of ADES after the reorganization as they held in and of ADA prior to the reorganization. ADES’s common stock became listed on the NASDAQ Capital Market under the symbol, "ADES," ADA’s previous symbol, and ADA’s stock ceased trading on the NASDAQ Capital Market on July 1, 2013. From March 30, 2015 through July 6, 2016, ADES's common stock was traded on the OTC Pink® Marketplace - Limited Information Tier under the trading symbol "ADES." Effective, July 7, 2016 ADES's common stock began trading on the NASDAQ Global Market under the symbol, ADES.other complementary activated carbon markets. This Annual Report on Form 10-K is referred to as the "Form 10-K" or the "Report."
As used in this filing pertains to the year ended December 31, 2017,Report, the terms the "Company," "we," "us" and "our" means ADA and its consolidated subsidiaries for the periods through and including the period ended June 30, 2013 and ADES and its consolidated subsidiaries forsubsidiaries.
We sell consumable products that utilize AC and chemical-based technologies to a broad range of customers, including coal-fired utilities, industrials, water treatment plants, and other diverse markets. Our proprietary technologies and associated product offerings provide purification solutions to enable our customers to reduce certain contaminants and pollutants to meet the dates or periods after July 1, 2013.challenges of existing and potential regulations.
As of December 31, 20172020 and 2016,2019, we held equity interests of 42.50%42.5% and 50.00%50.0% in Tinuum Group, LLC ("Tinuum Group") and Tinuum Services, LLC ("Tinuum Services"), respectively, which are both unconsolidated entities, and each of their operationsboth contribute significantly impactedto our financial position and results of operations for the years ended December 31, 2017, 20162020 and 2015.2019. We account for Tinuum Group and Tinuum Services under the equity method of accounting. As described further below, both Tinuum Group and Tinuum Services expect to significantly wind down their operations by the end of 2021 and we believe our Refined Coal ("RC") business will substantially cease as of December 31, 2021.
On July 27, 2017, the Company obtained a 50% membership interestAs further discussed below, in GWN Manager in exchange for a capital contribution of $0.1 million. GWN Manager subsequently purchased a 0.2% membership interestDecember 2020, we changed our operational management structure, which resulted in a subsidiary of Tinuum Group.
Business Purpose and Strategy
We provide emissions solutions to customersrevision in the coal-fired power generation and industrial boiler processes. We provide environmental control chemicals, equipment and technologies to our primary market that consists of approximately 650 coal-fired electrical generation units locatedreporting segments, as defined under accounting principles generally accepted in the United States.States ("U.S. GAAP"), to two reporting segments, RC and Advanced Purification Technologies ("APT"). Historically we had two reporting segments, RC and Power Generation and Industrials ("PGI"). The reporting segments are discussed in more detail later in this section.
Through our subsidiariesCustomer Supply Agreement
On September 30, 2020, we and joint ventures,Cabot Norit Americas, Inc., ("Cabot") entered into a supply agreement (the "Supply Agreement") pursuant to which we are a leader in emissions controlagree to sell and deliver to Cabot, and Cabot agrees to purchase and accept from us, certain lignite-based activated carbon products ("EC"Furnace Products") technologies and associated equipment, chemicals and services. Our proprietary environmental technologies enable our customers to reduce emissions of mercury and other pollutants, maximize utilization levels and improve operating efficiencies to meet the challenges of existing and pending EC regulations.
Our major activities include:
Development and sale of specialty chemicals, equipment, consulting services and other products designed to reduce emissions of mercury, acid gases, metals and other pollutants, and the providing of technology services in support of our customers' emissions compliance strategies; and
Through Tinuum Group, an unconsolidated entity, reduction of mercury and nitrogen oxide ("NOX") emissions at select coal-fired power generators through the production and sale of Refined Coal ("RC") that qualifies for tax credits under the Internal Revenue Code ("IRC") Section 45 - Production Tax Credit ("Section 45 tax credits"). We benefit from Tinuum Group's production and sale of RC, which generates tax credits, as well as the revenue from selling or leasing RC facilities to tax equity investors. See the separately filed financial statements of Tinuum Group included in Item 15 - "Exhibits, Financial Statement Schedules" ("Item 15") of this Report.
Markets for Our Products and Services
We expect that the share of coal-fired power generation as a percentage of U.S. electricity generation to be more stable compared to previous years when many coal-fired generating units were shut down in response to low gas prices and increasingly stringent environmental regulations. Further, we believe that coal-fired power generation will remain a significant component. The term of the U.S. power generation mixSupply Agreement is for many15 years given coal's abundance, affordability, reliability and availability as a domestic fuel source. Currently,with 10-year renewal terms that are automatic unless either party provides three years prior notice of intention not to renew before the Energy Information Administration ("EIA") estimates coal makes up 30%end of theany term.

United States electric generation. In its Annual Energy Outlook for 2017, the EIA projects that coal will provide between 24% and 33% of electricity generation in 2040 depending on whether the Clean Power Plan ("CPP") of the U.S. Environmental Protection Agency ("EPA"), which addresses limiting greenhouse gas emissions, is or is not implemented. The primary drivers for many of our products and services are environmental laws and regulations impacting the electric power generation industry and other coal users. These regulations include the Mercury and Air Toxics Standards ("MATS"), a U.S. federal regulation requiring all existing and any new coal-fired electric generating units to control mercury emissions, acid gases, and particulate matter, as well as various state regulations and permitting requirements for coal-fired electric generating units. In addition to the federal MATS rule, certain states have their own mercury rules that are similar to, or more stringent than, MATS,sale by us and many coal-fired electric generating units around the countrypurchase by Cabot of Furnace Products, we and Cabot have agreed to consent decrees, which require pollution controlsadditional terms whereby Cabot will reimburse us for certain capital expenditures we incur that are necessary to manufacture the Furnace Products. Reimbursements will be in some cases, are more restrictive than the existing regulations. form of revenues earned from capital expenditures incurred that will benefit both us and Cabot and capital expenditures incurred that will benefit Cabot exclusively.
We continue to believe the MATS regulation as well as certain state regulations createSupply Agreement will provide material incremental volume and capture lower operating cost efficiencies of our manufacturing plant located in Louisiana (the "Red River Plant"). As these incremental volumes come on-line and after our existing inventory balances are sold, we anticipate an increase in gross margins. Further, the Supply Agreement will expand our AC products to additional markets that are outside of coal-fired power generation.
On February 1, 2021, we and a subsidiary of Cabot Corporation ("Cabot Corporation") entered into a 5-year supply agreement ("EMEA Supply Agreement") to supply Cabot Corporation with lignite activated carbon products and other proprietary products used for mercury removal in utility and industrial coal-fired power plants in the EMEA market (as defined below). Cabot Corporation will be the exclusive and sole reseller of these products within Europe, Turkey, the Middle East and Africa ("EMEA"), and we will have a first right to provide the products to Cabot for our RCsale in the EMEA.
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Acquisition of Marshall Mine
Concurrently with the execution of the Supply Agreement, on September 30, 2020, we entered into an agreement to purchase (the "Mine Purchase Agreement") from Cabot 100% of the membership interests in Marshall Mine, LLC (the "Marshall Mine Acquisition") for a nominal cash purchase price. Marshall Mine, LLC owns a lignite mine located outside of Marshall, Texas (the "Marshall Mine"). Immediately after completion of the Mine Purchase Agreement, we independently determined to commence activities to shutter the Marshall Mine, and EC products.we will incur the associated reclamation costs.
In general, coal is a low cost, stable and reliable source of domestic energy that, unlike many other forms of energy, can be easily stored in large quantities. We believe coal is critical to ensuringconjunction with the U.S. has a secure and stable source of energy. With current environmental regulations, we believe it is unlikely that any new coal-fired electric generating units will be financed or constructed, which suggests that the average coal-fired electric generating unit age in 2040 will be 64 years old. However, following the retirement of manyexecution of the less efficient and generally smaller coal-fired electric generating units over the past few years,Supply Agreement and the announcement from the EPAMine Purchase Agreement, on October 10, 2017 of their proposalSeptember 30, 2020, we entered into a reclamation contract (the "Reclamation Contract") with a third party that provides a capped cost, subject to repeal the CPP, we believe thatcertain contingencies, in the amount of electricity generated from coal will remain relatively steadyapproximately $19.7 million plus an obligation to pay certain direct costs of approximately $3.6 million (collectively, the "Reclamation Costs") over the estimated reclamation period of 10 years. Under the terms of the Supply Agreement, Cabot is obligated to reimburse us for $10.2 million of Reclamation Costs (the "Reclamation Reimbursements"), which are payable semi-annually over 13 years and inclusive of interest. As of September 30, 2020, we recorded an asset retirement obligation related to the Reclamation Contract in the near term.amount of $21.3 million and a receivable related to the Reclamation Reimbursements in the amount of $9.7 million.
WhileAs the long-term futureowner of the Marshall Mine, we were required to post a surety bond to ensure performance of our reclamation activities in the amount of $30.0 million under the Surety Bond Indemnification Agreement (the "Surety Agreement"). For the obligations due under the Reclamation Contract, we were required, under the Surety Agreement, to post initial collateral of $5.0 million dollars as of September 30, 2020 and to post an additional $5.0 million dollars as of March 31, 2021.
Markets
AC is uncertain,a specialized sorbent material that is used widely in a host of industrial and consumer applications to remove impurities, contaminants or pollutants from gas, water and other product or waste streams. AC is produced by activating carbonaceous raw materials, including wood, coal, nut shells, resins and petroleum pitch. Properties such as coal assetssurface area, pore volume and particle size can be specifically engineered to selectively target various contaminants to meet end-use application requirements. AC can come in several different forms that are important for the end-use application, including powdered activated carbon ("PAC"), granular activated carbon ("GAC"), pellets, honeycombs, blocks or cloths.
Key markets include removal of heavy metal pollutants from coal-fired electrical generation processes, treatment of drinking and waste waters, industrial acid gas and odor removal, automotive gasoline emission control, soil and ground water remediation, and food and beverage process and product purification.
The AC market has been and is expected to continue to age,be driven by increasing environmental regulations pertaining to water and air purification, especially in the mature and more industrialized areas of the world. Additionally, we expect a continued purchasing trend towards variable costbelieve environmental issues will continue to be the predominant force in the AC markets of rapidly developing countries.
We see opportunities to continue to pursue diverse markets for our purification products and integrated solutions with low capital expenditure requirements and away from large capital equipmentoutside of coal-fire power generation, including industrial application, water treatment plants and other fixed cost solutionsend markets.
Segments
Refined Coal
Tinuum Group provides reduction of mercury and nitrogen oxide ("NOX") emissions at select coal-fired power generators through the production and sale of RC that are less likelyqualifies for tax credits ("Section 45 tax credits") under the Internal Revenue Code ("IRC") Section 45 - Production Tax Credit ("IRC Section 45"). We benefit from Tinuum Group's production and sale of RC through our share of earnings from Tinuum Group's sales or leases of RC facilities to have costs recovered.
We believe it is likely that many U.S. coal mines, coal-fired electric generating units, coal-centric large equipment providerstax equity investors. Both Tinuum Group and other coal-related businesses will have difficulty in adaptingTinuum Services expect to industry changessignificantly wind down their operations by the end of 2021 due to the expected inexpiration of the coming years. However, we see opportunities for companies that can offer their customers creative and cost-effective solutions that help the U.S. coal-related businesses meet regulatory compliance, improve efficiency, lower costs and maintain reliability.
AsSection 45 tax credit period as of December 31, 2017,2021. As such, our primary products, servicesearnings and RC technology licenses available to coal-fired electric generating units requiring solutions to assist with compliance with emissions standards included:
Chemicals:
Our patented M-ProveTM ("M-Prove") technology, which is also incorporated in our RC technologies, that provides a cost effective alternative to other halogen-based, oxidation chemicals used to enhance removal of mercury emissions. M-Provetechnology mitigates coal treatment corrosion risks to minimize maintenance and repair costs to enhance system reliability and risks associated with bromine discharge from plant wastewater; and
Our RESPond® ("RESPond") liquid chemical additive that is a highly effective ash resistivity modifier for power plants operating cold-side electrostatic precipitators. Unlike Sulfur Trioxide ("SO3")solutions, the incumbent chemical being used to modify ash resistivity, the RESPond additive does not interfere with or reduce the effectiveness of activated carbon injected into the flue gas for purposes of reducing mercury emissions.

RC technology licenses:
Our patented CyCleanTM ("CyClean") technology, a pre-combustion coal treatment process that provides electric power generators the ability to enhance combustion and reduce emissions of NOX and mercury from coals burned in cyclone boilers; and
Our patented M-45TM and patent pending M-45-PCTM technologies (collectively, the "M-45 Technology"), which are proprietary pre-combustion coal treatment technologies used to control emissions from circulating fluidized bed boilers and pulverized coal boilers, respectively.

Equipment:
Low capital expenditure mercury control technologies and systems such as Activated Carbon Injection ("ACI") systems, that effectively reduce mercury emissions over a broad range of plant configurations and coal types;
Dry Sorbent Injection systems ("DSI") that reduce emissions of Sulfur Dioxide ("SO2") and other acid gases such as SO3 and Hydrogen Chloride ("HC1"); and
Other equipment that may be necessary for longer term storage for consumable additives as well as our patented ADAirTM Mixer in-duct technology that alters flue gas flow to improve mixing and optimize particle dispersion to reduce sorbent consumption for ACI and DSI systems.

Consulting services and other:
We provide general consulting services as requested by our customers related to emissions control.
Additionally, we generate significant earningsdistributions from our investment in Tinuum Group. AsRC segment will substantially cease as of December 31, 2017,2021. See the separately filed financial statements of Tinuum Group has builtincluded in Item 15 - "Exhibits, Financial Statement Schedules" ("Item 15") of this Report.
Products
Our patented M-45TM and placed into serviceM-45-PCTM technologies (collectively, the "M-45 Technology") are proprietary pre-combustion coal treatment technologies used to control emissions from circulating fluidized bed boilers and pulverized coal boilers, respectively.
Our patented CyCleanTM technology, a totalpre-combustion coal treatment process provides electric power generators the ability to enhance combustion and reduce emissions of 28nitrogen oxides ("NOX") and mercury from coals burned in cyclone boilers.
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Our patents related to the RC segment are not expected to have significant commercial application post the expected expiration of the Section 45 tax credit period.
Sales and Customers
Our RC segment derives its revenues from license royalties ("M-45 Royalties") earned under a licensing arrangement (the "M-45 License") with Tinuum Group for their use of our proprietary chemical technologies, M-45TM and M-45-PCTM (the "M-45 Technology") at their RC facilities designed to producetreat coal for the reduction of emissions of both NOX and mercury. For the year ended December 31, 2020, M-45 Royalties comprised 22% of our total consolidated revenues. M-45 Royalties are recognized based upon a percentage of the per-ton, pre-tax margin as defined in the M-45 License. We also derive substantial earnings in the RC for salesegment from our equity method investments in Tinuum Group and Tinuum Services. Both Tinuum Group and Tinuum Services expect to coal-fired electric generating units. significantly wind down their operations by the end of 2021 due to the planned expiration of the Section 45 tax credit period as of December 31, 2021, and the loss of equity earnings and M-45 Royalties will have a material adverse effect on our financial condition and consolidated operating results compared to historical periods beginning in 2022. Additional information related to major customers is disclosed in Note 21 of the Consolidated Financial Statements included in Item 8 of this Report.
Coal-fired electricelectricity generating units use RC as one of a portfolio of tools to help comply with MATSMercury and Air Toxics Standards ("MATS") and other environmental regulations. These RC facilities produce and sell RC that qualifies for Section 45 tax credits, including meeting the "placed in service" requirements (referred to as "placed in service"). The IRS has issued guidance regarding emissions reductions in the production of electricity by coal-fired electric generating units, including measurement and certification criteria necessary to qualify for the Section 45 tax credits. The ability to produce and sell RC which generatesand generate Section 45 tax credits, expires 10 years after each RC facility iswas placed in service, but not later than December 31, 2021. Two of Tinuum Group's RC facilities were placedreached their 10-year life in service in 20092019, and related Section 45 tax credits forearned from these facilities substantially expireexpired in December 2019. As of December 31, 2020, Tinuum Group has built and placed into service a total of 26 RC facilities that produce RC for sale to coal-fired electricity generating units, and which are still eligible to produce RC qualifying for Section 45 tax credits. The ability to generate Section 45 tax credits related to thethose remaining 26 RC facilities expireexpires in 2021.
Once an RC facility is in operation, Tinuum Group may lease or sell it to a tax equity investor, which we refer to as an "invested" RC facility. The tax equity investor subsequently operates the RC facility to produce and sell RC to a utility. It is financially advantageous for Tinuum Group to lease or sell an RC facility, as the tax equity investor assumes the operating expenses for the RC facility and paysremits to Tinuum Group either an up-front paymentpayments to purchase or lease payments to lease the RC facility. We benefit from equity income and cash distributions accruing through our investment infrom Tinuum Group. Tax equity investors may benefit from their investment in RC facilities through the realization of tax assets and credits from the production and sale of RC.
RC facilities that are producing and selling RC and have not been leased or sold, are referred to as "retained" RC facilities, whereby the RC is produced and sold by Tinuum Group and, as an owner in Tinuum Group, we benefit from the related Section 45 tax benefits. As of December 31, 20172020 and 2016, respectively,2019, the Section 45 tax credits were $6.91$7.301 and $6.81$7.173 per ton, respectively, of RC produced and sold to a utility. The value of the Section 45 tax credits is adjusted annually based on inflation adjustment factors published in the Federal Register. As of December 31, 2017,2020, we have received,earned substantial tax credits from certain retained RC facilities through our ownership in Tinuum Group, but have not been able to fully utilize substantial tax credits and benefits from certain retained RC facilities that previously produced and sold RC for the benefit of Tinuum Group.them. See Note 1218 to our Consolidated Financial Statements included in Item 8 - "Financial Statements and Supplementary Data" ("Item 8") of this Report for additional information regarding our net operating losses, tax credits and other deferred tax assets.
As of December 31, 2017,2020, Tinuum Group had 1723 invested RC facilities producing RC at utility sites and no retained RC facilities. The remaining 11 RC facilities, although placed in service, were either installed but not operating, awaiting site selection or in various other stages of contract negotiation or permanent installation.
The RC facilities producing and selling RC as of December 31, 2017 are generally operated by Tinuum Services under operating and maintenance agreements with the owners or lesseessites. Absent an extension of the RC facilities.
Segment Information
Section 45 tax credit period, we do not believe that Tinuum will enter into additional contracts for invested facilities during 2021. As of December 31, 2017, our operations consisted of two reportable segments: (1) RC and (2) EC.
Financial information related to each of our reportable segments is set forth in Note 13 of the Consolidated Financial Statements included in Item 8 of this Report.

(1)RC Segment
Our RC segment derives its earnings from equity method investments as well as royalty payment streams and other revenues related to reduced emissions of both NOX and mercury from coal treated with our proprietary chemicals and burned at coal-fired electric generating units. Our equity method investments related to the RC segment include2020, Tinuum Group had nine facilities that are leased to affiliates of The Goldman Sachs Group (the "GS Affiliates"), and one of these GS Affiliates is also an owner of Tinuum Services and GWN Manager.
Group. A majority of Tinuum Group owns,Group's leases or sells facilities used in the production of RC. The RC facilities are located at coal-fired generation stations owned by regulated utilities, cooperatives, government agencies and wholesale power generators (collectively, "Generators"). The RC produced by the RC facilities is used by the Generators as fuel in the coal-fired boilers to produce electricity. For invested RC facilities, Tinuum Group collects lease income from the lessee if leased, or sales proceeds from the buyer if sold. We benefit from these transactions through our equity method investment in Tinuum Group. RC facilities that are producing RC, but that Tinuum Group has not leased or sold, are referred to as retained RC facilities. Tinuum Group produces and sells RC to Generatorsperiodically renewed and the ownersloss of Tinuum Group, including us, may benefitthese investors or material modification to the extent Section 45 tax creditslease terms of these facilities would have a significant adverse impact on Tinuum Group's financial position, results of operations and other tax benefits are realized from the operationcash flows, which in turn would have material adverse impact on our financial position, results of retained RC facilities.operations and cash flows.

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Tinuum Services operates and maintains RC facilities under operating and maintenance agreements with Tinuum Group and owners or lessees of RC facilities. Tinuum Group or theThe owners or lessees of the RC facilities pay Tinuum Services, subject to certain limitations, the costs of operating and maintaining the RC facilities plus various fees. Tinuum Services also arranges for the purchase and delivery of certain chemical additives under chemical agency agreements whichthat include the chemicals required for our CyCleanTM and M-45 Technologies that are necessary for the production of RC. The term of each chemical agency agreement runs concurrently with the respective RC facility's sale or leaseoperating and maintenance agreement.
We also earn royalties from the licensing of our M-45 Technology ("M-45 License") to Tinuum Group. Royalties are recognized based upon a percentage of the per-ton, pre-tax margin as defined in the M-45 License.
Key drivers to RC segment performance and cash distributions are the number of operating (leased or sold) versus retained RC facilities, production and sale of RC and royalty-bearing tonnage.
Refined Coal Data
The following table provides summary information related to the Company's investment in Tinuum Group and the related RC facilities as of December 31, 20172020 and tons of RC produced and sold for the year ended December 31, 2017:
2020:
     OperatingOperating
 # of RC Facilities Not Operating Invested Retained# of RC FacilitiesNot OperatingInvestedRetained
RC Facilities 28
 11
 17
(1)
RC Facilities26 23 (1)— 
RC tons produced and sold (000's)     46,887
 1,187
RC tons produced and sold (000's)64,982 693 
The following tables provide summary information of Tinuum Group's RC facilities as of December 31, 2019 and tons of RC produced and sold for the year ended December 31, 2019:
Operating
# of RC FacilitiesNot OperatingInvestedRetained
Facilities26 20 (1)— 
RC tons produced and sold (000's)66,481 1,505 
(1) One RC facility iswas approximately 50% invested with an independent third party. TheAs of December 31, 2019, the remaining approximate 50% iswas retained by Tinuum Group, the Company and another member of Tinuum Group. During the year ended December 31, 2020, Tinuum Group sold its interest in this RC facility.
Competition
We believe Chem-Mod, LLC and licensees of Chem-Mod's technology are Tinuum Group's principal competitors. Competition in the RC market is based primarily on price, the number of tons of coal burned at the coal-fired electric generating units where the RC facilities are operating and the Company.tax compliance facts associated with each RC facility.
Additional information related toRaw Materials
The principal raw materials used in our RC products are comprised of non-bromine based halogens.
Operations
Tinuum RC facilities is includedare located at coal-fired power plants in Item 7 - "Management’s Discussionthe U.S. As of December 31, 2020, Tinuum Group and Analysis of Financial Condition and Results of Operations" ("Item 7") of this Report.Tinuum Services had operations in 16 states.
(2)EC Segment
(a)Systems & Equipment- Activated Carbon Injection, Dry Sorbent Injection System and Other Systems
Historically, our EC segment included revenues and related expenses fromAdvanced Purification Technologies
Given the sale of ACI and DSI equipment systems, chemical sales, consulting services and other sales related to the reduction of emissionsdownward trends in the coal-fired electricpower generation processmarket, the prices of competing power generation sources as well as our recognition of the unavailability of Section 45 tax credits for RC after 2021, during 2020 we executed on plans to expand our AC products and diversify into new markets. As a result, internal changes, including changes in operating structure and the electric utility industry. Demand for ACImethod in which the Chief Operating Decision Maker ("CODM") allocates resources, resulted in the change in reportable segments.
Products
Our AC and DSI system contracts historically was driven bychemical products are used to purify coal-fired utilities, industrials, water treatment plants, and other markets. For the purification of air and gases, one of the uses of AC is to reduce mercury emissions and other air contaminants, specifically at coal-fired power plant utilities that needed to comply with MATS and Maximum Achievable Control Technology Standards ("MACT"). As the deadline for these standards has passed, and customers have now implemented ACI, DSIgenerators and other largeindustrial companies. Most of the North American coal-fired power generators installed equipment systemsto control air pollutants, such as mercury, prior to or since the inception of the MATS. However, many power generators need consumable products on a componentrecurring basis to chemically and physically capture mercury and other contaminants. AC has widely been adopted as the best available technology to capture mercury due to product efficiency and
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effectiveness and currently accounts for over 50% of their strategies to comply with applicable regulations, the Company does not anticipate entering into future long-term fixed price contracts for ACI or DSI systems. However, we may continue to provide smaller scale equipment products that may be needed by power generation units as part of their ongoing operations.
Currently, we are transforming ourselves into a consumable products-focused company to provide customers with emission reduction solutions within the mercury control consumables North American market.

(b)Chemicals
Current mercury control options include consumables that utilize powdered activated carbon (“PAC”), halogen and re-emissions technologies. These options provide coal-powered utilities and industrial boilers with mercury control solutions working in conjunction with ACI and DSI systems We offer AC and other pollutionchemical products and work with customers as they develop and implement a compliance control equipment, generally without the requirement for significant ongoing capital outlays. Our current proprietary chemical portfolio generally provides customers with halogen and flue gas conditioning technology options, which include M-Prove and RESPond, respectively. Currently, sales of these products comprise a small piece ofstrategy that utilizes the consumables market. Our currentsolutions that fit with their unique operating and future focus ispollutions control configuration.
For the purification of water, AC has been used in the treatment of drinking water, wastewater, contaminated soil and groundwater to increase our market share within the consumables market, both organicallyabsorb compounds causing unpleasant taste and through potential acquisition(s).
Our patented M-Prove pre-combustion coalodor and other contaminants. Both industrial and municipal wastewater treatment technology involves the application of chemicals to coal. This technology substantially reduces mercury emissions and also can reduce the amount of activated carbon or other sorbents used to meet regulatory mercury emission limits. The power industry is beginning to experience corrosion and wastewater issues in their plants that they attribute tohave deployed the use of bromineAC in their treatment processes. Groundwater contamination has become a matter of increasing concern to enhance the capture of mercury.
We believe the key benefits of the M-Prove additive are as follows:
effective at extremely low treatment rates;
significantly reduces "balance-of-plant" risks attributed to other halogen-based coal treatments, including corrosion to air pre-heater baskets;
minimizes ancillary halogen emissions in the stackfederal and state governments as well as fly ash and wastewater;to the public, especially in the last 10 years. The U.S. AC market may see significant growth from water purification markets, especially if future regulations are passed controlling certain chemicals in drinking water. At present, individual states are primarily responsible for the protection of groundwater.
reduces sorbent consumptionCoal, as a fuel source for ACI systems;
facilitates enhanced mercury removal by downstream pollution control devices;
supports fuel flexibility and potentialelectricity generation, continues to be a significant source of power generation, although significantly decreased from when coal was the primary power generation source for fuel cost savings.
the country. We experienced higher demandsee opportunities to continue to pursue diverse markets for our M-ProveTechnologypurification products outside of coal-fired power generation, including industrial applications, water treatment plants and other diverse markets. We expect the Supply Agreement with Cabot, as discussed above, does help expand our AC products into some of those diverse end-markets.
Sales and Customers
Sales of consumables are primarily made by the Company’s employees to a range of customers, including coal-fired utilities, industrial companies, water treatment plants and other customers. Some of our sales of AC are made under annual requirements-based contracts or longer-term agreements. Revenues from our top three customers comprised approximately 28% of our consolidated consumables revenues for the year ended December 31, 2020, and the loss of any of these customers would have a material adverse effect on the APT operating results.
Competition
Our primary competitors for consumable products include Cabot (CBT), Calgon Carbon, a subsidiary of Tokyo Stock Exchange listed Kuraray Co., Ltd., Donau Carbon Company, Midwest Energy Emissions Corp. (MEEC) and Nalco Holding Company, a subsidiary of Ecolab Inc. (ECL).
Raw Materials
The principal raw material we use in 2017the manufacturing of AC is lignite coal, which is, in general, readily available and we believe that related revenues will continue to increase in 2018 as plants gain experience with their mercury control systems and begin to optimize their strategy to reduce operational impacts, especially as they relate to corrosion and wastewater. In October 2012, we were awarded the first in a family of patents designed to protect this technology in the U.S., and are pursuing similar patents in various other countries.
We license certain emissions control technologies, including the M-Prove additive, to Tinuum Group for the production of RC to reduce emissions of both mercury and NOX from coal-fired boilers. We licensedhave an adequate supply through our patented CyClean technology to Tinuum Group upon formationownership of the entity in 2006Five Forks Mine, which is operated for use with cyclone boilers for the lifeus by Demery Resources Company, LLC ("Demery"), a subsidiary of the patents. In July 2012, we executed the M-45 LicenseNorth American Coal Company.
We purchase additives that are included in certain chemical products for resale to our customers through contracts with Tinuum Group, whichsuppliers. The manufacturing of these consumable products is effective for the durationdependent upon certain discrete additives that Section 45 tax credits are available. We believe these licenses will leverage Tinuum Group’s operating expertisesubject to price fluctuations and allow it the ability to provide and use either the CyClean or M-Prove Technologies to produce RC. Later in 2012, we made a technological advancement in the M-Prove Technology, which was incorporated in the M-45 License and allows it to be effective in “pulverized coal” (“PC”) boilers.supply constraints. In addition, the number of suppliers who provide the necessary additives needed to manufacture our products are limited. Supply agreements with these producers are generally renewed on an annual basis.
Operations
We own and operate the Red River plant that is located in Louisiana. We also lease a manufacturing and distribution facility located in Louisiana. Additionally, we have sales, product development and administrative operations located in Colorado.
Research and Development Activities
We have conducted research and development directed towards product development related to the royalty paymentsSupply Agreement and other markets. During the years ended December 31, 2020 and 2019, we receive from Tinuum Group, the useincurred expenses of M-Prove Technology in the production of RC provides valuable operating data$1.0 million and validates the effectiveness of the M-Prove Technology in a range of coal-fired boilers. We expect this information will help in our sales process for the M-Prove Technology. We are in the early stages of selling M-Prove into the EC market and a portion of our current revenues in this offering include application tests of M-Prove at customer sites.
We have deployed technologies for conditioning flue gas streams from coal-fired combustion sources and maybe used as an alternative to other mercury control products. Our flue gas conditioning chemicals, sold under the trade name RESPond®, allow existing air pollution control devices, such as electrostatic precipitators ("ESPs"), to operate more efficiently without the use of traditional SO3 additives, which have been shown to be detrimental to effective mercury control by partially negating the effectiveness of certain sorbents used to absorb mercury, including activated carbon. Such treatment of the flue gas stream allows for effective collection of fly ash particles that would otherwise escape into the atmosphere. The use of the proprietary chemical blends may help existing marginally sized ESPs continue to operate effectively when applied exclusively, or in combination with other chemicals such as hydrated lime, activated carbon products, or other high-resistivity materials.
(c)Consulting Services
Historically, we have provided consulting services to assist electric power generators, the electric utility industry and others in planning and implementing strategies to meet the new and increasing government emission standards requiring reductions in SO2, SO3, HC1, NOX, particulates, acid gases and mercury. We anticipate that consulting services revenue will continue to diminish as we shift our focus to selling in the emissions reduction consumables market.

The following table shows the amount of total revenue by type:
  Years Ended December 31,
(in thousands) 2017 2016 2015
Revenues:      
Equipment sales $31,401
 $46,949
 $60,099
Chemicals 4,246
 3,025
 888
Consulting services and other 45
 648
 1,752
Total revenues $35,692
 $50,622
 $62,739
$0.2 million, respectively.
Legislation and Environmental Regulations
Our products and services, as well as Tinuum Group’s production and sale of RC, are for the reduction of pollutants and other contaminants. To the extent that legislation and regulation limit the amount of pollutants and other contaminants permitted, the need for our products increases. Below is a summary of the primary legislation and regulation that affects the market for our products.

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U.S. Federal Mercury and Air Toxic Standards (“MATS”("MATS") Affecting Electric Utility Steam Generating Units
On December 16, 2011, theThe U.S. EPA issued theEnvironmental Protection Agency ("EPA") final "MATS Rule," which tookRule" went into effect in April 2012. The EPA structured the MATS Rule as a MACT-based hazardous pollutant regulation applicable to coal and oil-fired Electric Utility Steam Generating Units (“EGU”("EGU"), which generate electricity viathrough steam turbines and have a capacity of 25 megawatts or greater, and provide for, among other provisions, control of mercury, and particulate matter and control of acid gases such as HClhydrochloric acid ("HCl") and other Hazardous Air Pollutants ("HAPs"). Approximately 1,260 units were coal-fired EGUs.EGUs when the rule was enacted. According to our estimates, the standardMATS Rule sets a limit that we believe requires the capture of up to 80-90% of the mercury in the coal burned in electric power generation boilers as measured at the exhaust stack outlet for most plants. The MACT standards are also known as National Emission Standards for Hazardous Air Pollutants ("NESHAP"). Plants generally had four years to comply with the MATS Rule, and we estimate that, based on data reported to the EPA and conversations with plant operators, most plants were required to comply by April 2016 and implementation of the MATS Rule is now largely complete. We estimate that 48%42% of the coal-fired EGUs that were operating in December 2011 when the MATS ruleRule was finalized have been permanently shut down, leaving approximately 650527 EGUs in operation at the end of 2017.2019.
In April 2017, a review by the U.S. Court of Appeals for the D.C. Circuit of a 2016 “supplemental finding” associated with the cost benefit analysis of the MATS Rule conducted by the EPA was stayed at the request of the currentTrump Administration. The court case continues to be stayed indefinitely, butindefinitely. In May 2020, the EPA reconsidered and withdrew its 2016 "supplemental finding" associated with the cost benefit analysis of the MATS Rule. In this action, EPA found that it was not “appropriate and necessary” to regulate HAPs emissions from coal- and oil-fired EGUs. However, the EPA expressly stated that the reconsideration neither removed coal- and oil-fired EGUs from the list of sources that must comply with the MATS rule, nor rescinded the MATS Rule, which has remained continuously in effect. ADES joined a number of parties in seeking review of this EPA action before the U.S. Court of Appeals for the D.C. Circuit. President Biden identified EPA’s withdrawal of the supplemental finding as one of the actions to be reviewed for conformity with Biden Administration policy, and in February 2021, the Biden Administration moved that the pending judicial review of the supplemental finding withdrawal be held in abeyance. The Court has granted the administration’s motion, and this appeal also is stillnow in force until the issue is resolved.abeyance. The EPA has not issued any further official proceedings regarding MATS Rule.Rule remains in effect.
State Mercury and Air Toxics Regulations Affecting EGUs
In addition, certain states have their own mercury rules that are similar to or more stringent than the MATS Rule, and coal-fired electricelectricity generating units aroundin the countryU.S are subject to consent decrees that require the control of acid gases and particulate matter, in addition to mercury emissions. Twenty-three states
U.S. Federal Industrial Boiler MACT
In January 2013, the U.S. EPA issued the final set of adjustments to the MACT-based air toxics standards for industrial boilers, including mercury, particulate matter, and acid gas emission limits. Existing boilers typically had until January 31, 2017 to comply with the rule. On December 1, 2014, the EPA announced the reconsideration of the industrial boiler MACT ("IBMACT") and proposed amendments to the version published January 31, 2013, representing technical corrections and clarifications. The proposed amendments do not affect the applicability of the final rule.
The EPA estimated that approximately 600 coal-fired boilers will be affected by IBMACT, in industries such as pulp and paper. Our estimates, based on conversations with plant operators, suggest that most of the affected plants have mercury-specific rules that affect more than 283 generating units and more than 100 GW of generating capacity that were still operating ator will either shut down or switch fuels to natural gas to comply with the end of 2017.regulation.
Effluent Limitation Guidelines
On September 30,In 2015, the EPA set the first federal limits known as effluent limitation guidelines (“ELGs”) on the levels of toxic metals in wastewater that can be discharged from power plants. The final rule requires, among other things, zero discharge for fly ash and bottom ash transport water, and limits on mercury, arsenic, selenium, and nitrate from flue gas desulfurization ("FGD") wastewater (also known as "legacy wastewater").wastewater. In AprilSeptember 2017, the EPA Administrator announced his decision to reconsider the Effluent Limitations Guidelines ("ELG") Rule, and the U.S. Court of Appeals Fifth Circuit granted the motion to reconsider and placed the case in abeyance, whichfinalized a rule that delayed the earliestoriginal compliance datedeadlines for certain wastewater streams from November 2018 to November 2020. In September 2017,2020, with the EPA indicatedpossibility that plants would not need to comply before November 2020, with a possible extension of up to five yearsuntil December 2023 with state approval. Although halogens areIn April 2019, the U.S. Court of Appeals for the Fifth Circuit struck down the EPA’s ELGs that apply to leachate wastewater and "legacy wastewater," and directed the EPA to revise the limits on the levels of toxic metals in those wastewater streams. In November 2019, the EPA proposed to revise the ELGs for bottom ash and FGD wastewater. The final rule, published in the Federal Register on October 13, 2020 and effective on December 14, 2020, does not directly regulatedregulate halogens. It does, however, propose to establish a voluntary incentives program for the removal of certain halides. Though
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under several (though not all) of the proposed treatment options that the EPA is considering, selenium in the effluent guidelines, someFGD wastewater would be regulated. Some halogens may impact the effectiveness of biological wastewater treatment systems that are often used for the removal of selenium. We are evaluating whether the potential market opportunity supports our development of new products to help plants comply with these rules, as well as how these rules may affect our current product offerings.
Additional U.S. Legislation and Regulations
On August 3,In 2015, the EPA finalized rules to reducedreduce greenhouse gases ("GHGs") in the form of the CPP,Clean Power Plan ("CPP"), which established guidelines for states to follow in developing plans to reduce GHG emissions.emissions from fossil fuel-fired power plants. Under the CPP, states arewere required to prepare State Implementation Plans"State Plans" to meet state targets established based on emission reductions from affected sources. The CPP requires that the Best System of Emission Reduction ("BSER") be implemented and establishes three building blocks, which

include heat rate improvements at affected coal-fired electric generating units, substituting coal-fired generation with less carbon-intensive EGUs such as natural gas combined cycle plants, and substituting renewable generation. The CPP has beenwas challenged by multiple states in the U.S. Court of Appeals for the District of Columbia Circuit ("DC Circuit"). The CPP is currentlywas stayed by the U.S. Supreme Court, and a panel of 10 judges on the DC Circuit are reviewing the CPP following a hearing in September 2016. On October 10, 2017, the EPA announced a proposal to repeal the CPP.Court. The DC Circuit has been holdingheld the CPP litigation in abeyance sinceuntil April 28, 2017.2017, and dismissed the case once the EPA replaced the CPP.
In July 2019, the EPA repealed the CPP and replaced it with the Affordable Clean Energy ("ACE") rule, which established guidelines for states to follow in developing plans to reduce GHG emissions from fossil fuel-fired power plants. ACE also requires states to prepare State Plans and prescribes that they must be based on heat rate improvements at affected plants. Numerous states, power companies, and non-governmental organizations challenged the ACE rule in the D.C. Circuit, which vacated the ACE rule on January 19, 2021.
International Regulations
There are various international regulations related to mercury control. In Canada, the Canada-Wide Standard ("CWS") was initially implemented in 2010, with increasingly stringent limits through 2020 and with varying mercury emissions caps for each province. China and Germany both have limits for mercury emissions that are less stringent than U.S. limits whichand are typically met using co-benefits from other installed air pollution control equipment designed to control other pollutants. In May 2017, the EU ratified the Minimata Convention on Mercury, triggering mercury control regulations with implementation starting in 2021. Specific emissions limits are currently being developed guided by the best available technologies reference ("BREF") document for limiting stack emissions and liquid effluents from industrial processes. The BREF conclusions for large coal-fired electricelectricity generating units were adopted by the European Commission in July 2017.
Based upon the existing and potential regulations, we believe the international market for mercury control products may expand in the coming years, and we areyears. We believe the EMEA Supply Agreement will help facilitate positioning our patent portfolio and existing commercial products accordinglyin the EMEA region.
Mining Environmental and Reclamation Matters
Federal, state and local authorities regulate the U.S. coal mining industry with respect to matters such as employee health and safety and the environment, including the protection of air quality, water quality, wetlands, special status species of plants and animals, land uses, cultural and historic properties and other environmental resources identified during the permitting process. Reclamation is required during production and after mining has been completed. Materials used and generated by mining operations must also be preparedmanaged according to applicable regulations and law.
The Surface Mining Control and Reclamation Act of 1977 ("SMCRA"), establishes mining, environmental protection, reclamation and closure standards for all aspects of surface mining. Mining operators must obtain SMCRA permits and permit renewals from the Office of Surface Mining (the "OSM"), or from the applicable state agency if an international market for our products develops.the state agency has obtained regulatory primacy. A state agency may achieve primacy if the state regulatory agency develops a mining regulatory program that is no less stringent than the federal mining regulatory program under SMCRA. The Five Forks Mine operates in Louisiana, which has achieved primacy and issues permits in lieu of the OSM. The Marshall Mine operates in Texas, which has achieved primacy and issues permits in lieu of the OSM.
Competition
In the EC consumables market, our mercury control chemicals primarily compete againstMine operators are often required by federal and/or state laws, including SMCRA, to assure, usually through the use of brominated PAC, as well as the usesurety bonds, payment of bromine applied to thecertain long‑term obligations including mine closure or reclamation costs, federal and state workers’ compensation costs, coal prior to combustion. Our primary competitorsleases and other miscellaneous obligations. Although surety bonds are usually noncancelable during their term, many of these bonds are renewable on an annual basis and collateral requirements may change. As of December 31, 2020, we posted a surety bond of approximately $6.7 million for our coal additives are Nalco Water, Ecolab Company, and Midwest Energy Emissions Corp ("MEEC"). As it relates to brominated PAC providers, our primary competitors include ADA Carbon Solutions, Cabot Corporation, and Calgon Carbon.
In the RC market, we believe Chem-Mod, LLC ("Chem-Mod") and licenseesreclamation of the Chem-Mod technology are our principal competitors. Competition withinFive Forks Mine and $30.0 million for the RC market is based primarily on price, the numberreclamation of tons of coal burned at the coal-fired electric generating unit where the RC facilities are operating and the tax compliance facts associated with each RC facility. Additionally, competition for tax equity investors extends into other investment opportunities, including opportunities related to potential tax incentive transactions available to potential investors.Marshall Mine.
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Patents
As of December 31, 2017,2020, we held 3871 U.S. patents and three15 international patents that were issued or allowed, 1224 additional U.S. provisional patents or applications that were pending, and ninefive international patent applications that were either pending or filed relating to different aspects of our technology. Our existing patents generally have terms of 20 years from the date of filing, with our next patents expiring beginning in 2021. We consider many of our patents and pending patents to be critical to the ongoing conduct of our business.
Our Vendors and Supply of Materials
We purchase our proprietary chemicals through negotiated blending contracts that include confidentiality agreements with chemical suppliers. These arrangements attempt to assure continuous supply of our proprietary chemical blends. The manufacturing of our chemical products is dependent upon certain discrete chemicals that are subject to price fluctuations and supply constraints. In addition, the number of chemical suppliers who provide the necessary additives needed to manufacture our proprietary M-Prove and RESPond chemicals is limited. Supply agreements are generally renewed on an annual basis.
Seasonality of Activities
The sale of our chemicalconsumable products and RC facility operation levels depend on the operations of the coal-fired electric generatingpower generation units and industrial facilities to which the applicable chemicalsconsumables are provided and the location of the RC facilities, respectively. Coal-fired electricPower generation is weather dependent, with electricity and steam production varying in response to heating and cooling needs. Additionally, power generating units routinely schedule maintenance outages in the spring and/or fall depending upon the operation of the boilers. During the period in which an outage may occur, which may range from one week to over a month, no chemicalsconsumables are used orand no RC is produced andor sold, and our earnings and Tinuum's revenues canmay be correspondingly reduced. Additionally, power generation is
The sale of our AC products for water purification depends on demand from municipal water treatment facilities where these products are utilized. Depending on weather dependent, with electricityconditions and steam production varying in response to heating and cooling needs.

Dependence on Major Customers
We depend on our customer relationships with owners and operators of coal-fired power electric generating units as well as general marketother environmental factors the summer months historically have the highest demand for coal-fueled power generation. Additional informationPAC, as one of the major uses for PAC is for the treatment of taste and odor problems caused by increased degradation of organic contaminants and natural materials in water during the summer.
Safety, Health and Environment
Our operations are subject to numerous federal, state, and local laws, regulations, rules and ordinances relating to safety, health, and environmental matters ("SH&E Regulations"). These SH&E Regulations include requirements to maintain and comply with various environmental permits related to major customers is disclosed in Note 14the operation of many of our facilities, including mine health and safety laws required for continued operation of the Consolidated Financial Statements included in Item 8 of this Report.
Through our investment in Tinuum Group, we depend on our relationships with owners and operators of coal-fired power generation facilities, including various electric utilities and tax equity investors. Tinuum Group is the exclusive licensee for purposes of producing RC using the CyCleanand M-45 Technologies. Tinuum Group depends on tax equity investors, with significant concentration within affiliates of The Goldman Sachs Group, Inc. These investors could renegotiate or terminate their leases, or the utilities where the RC facilities are installed could materially reduce their use of RC.
Research and Development Activities
During 2017, we focused on pursuing the expansion of potential product offerings within the emissions reduction consumables market to complement our existing chemical solutions. Historically, we engaged in research and development activities that would bring the broader technologies to the EC market and expand our own offerings, including CO2 capture technology. This research and development was funded, in part, under contracts and/or cost reimbursement arrangements with the U.S. Department of Energy ("DOE") and other third parties.
Backlog
Backlog represents the dollar amount of revenues we expect to recognize in the future from fixed-price contracts, primarily for ACI and DSI systems as well as certain fixed-price chemical contracts that have been executed, but work has not commenced, and those that are currently in progress. A project is included within backlog when a contract is executed. Backlog amounts include anticipated revenues associated with the original contract amounts, executed change orders, and any claims that may be outstanding with customers. It does not include contracts that are in the bidding stage or have not been awarded. As a result, we believe the backlog figures are firm, subject to customer modifications, alterations or cancellation provisions contained in the various contracts.
Backlog may not be indicative of future operating results. Estimates of profitability could increase or decrease based on changes in direct materials, labor and subcontractor costs, and indirect costs related to contract performance, such as indirect labor, supplies, tools and repairs, and any claims with customers. Backlog is not a measure defined by accounting principles generally accepted in the United States and is not a measure of profitability. Our method for calculating backlog may not be comparable to methodologies used by other companies.
(in thousands)  
Backlog as of December 31, 2016 $49,468
New contracts 4,472
Change order and claims to existing contracts, net (76)
Revenues recognized (35,616)
Backlog as of December 31, 2017 $18,248
Based on our adoption of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09") on January 1, 2018, all the equipment system contracts that are included in backlog as of December 31, 2017, and costs related thereto, will be recognized through a balance sheet adjustment on January 1, 2018, and will not impact our earnings in 2018. All material backlog will be recognized as a balance sheet adjustment on January 1, 2018.
Operating Locations
During the years ended December 31, 2017 and 2016, we had domestic operations located in Colorado. During 2015, we had domestic and international operations, in which the domestic operations were located in Colorado and Pennsylvania. The Pennsylvania location, used as a manufacturing facility, was closed at the end of 2015, with certain wind-down activities remaining through early 2016. The international operations, which were not material to our total revenues or long-lived assets, were closed at the end of 2015. As of December 31, 2017, Tinuum Group and Tinuum Services had operations in 12 and 10 states, respectively, in the United States.

Five Forks Mine.
Employees
As of December 31, 20172020, we employed 29136 personnel, all of which were full-time and part-time personnel; allemployees; 35 employees were employed at our offices in Colorado.Colorado and 101 employees were employed at our facilities in Louisiana.
Available Information
Our periodic and current reports are filed with the SECSecurities and Exchange Commission ("SEC') pursuant to Section 13(a) of the Securities Exchange Act of 1934, as amended (the "Exchange Act") and are available free of charge within 24 hours after they are filed with, or furnished to, the SEC at the Company’s website at www.advancedemissionssolutions.com. The filings are also available through the SEC at the SEC's Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549 or by calling 1-800- SEC-0330.1-800-SEC-0330. Alternatively, these reports can be accessed at the SEC’s website at www.sec.gov. The information contained on our web sitewebsite shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act") or the Exchange Act.
Copies of Corporate Governance Documents
The following Company corporate governance documents are available free of charge at our website at www.advancedemissionssolutions.com and such information is available in print to any stockholder who requests it by contacting the Secretary of the Company at 640 Plaza Drive,8051 E. Maplewood Ave, Suite 270, Highlands Ranch210, Greenwood Village CO, 80129.80111.
Certificate of Incorporation
Bylaws
Code of Ethics and Business Conduct
Insider Trading Policy
Whistleblower Protection Policy
Board of Directors Responsibilities
Audit Committee Charter
Compensation Committee Charter
Nominating and Governance Committee Charter

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Forward-Looking Statements Found in this Report
This Report contains forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act that involve risks and uncertainties. In particular such forward-looking statements are found in this Part I and under the heading in Part II, Item 7 below. Words or phrases such as "anticipates," "believes," "expects," "intends," "plans," "estimates," "predicts," the negative expressions of such words, or similar expressions are used in this Report to identify forward-looking statements, and such forward-looking statements include, but are not limited to, statements or expectations regarding:
(a)the scope and impact of mercury and other regulations or pollution control requirements, including the impact of the final MATS;
(b)the production and sale of RC by the RC facilities will qualify for Section 45 tax credits;
(c)expected growth or contraction in and potential size of our target markets;
(d)expected supply and demand for our products and services;
(e)increasing competition in the emission control market;
(f)our ability to satisfy warranty and performance guarantee provisions;
(g)expected dissolution and winding down of certain of our wholly-owned subsidiaries;
(h)future level of research and development activities;
(i)the effectiveness of our technologies and the benefits they provide;
(j)Tinuum Group’s ability to profitably sell and/or lease additional RC facilities and/or RC facilities that may be returned to Tinuum Group, or recognize the tax benefits from production and sale of RC on retained RC facilities;
(k)probability of any loss occurring with respect to certain guarantees made by Tinuum Group ("Party Guarantees");
(l)the timing of awards of, and work and related testing under, our contracts and agreements and their value;
(m)the timing and amounts of or changes in future revenues, royalties earned, backlog, funding for our business and projects, margins, expenses, earnings, tax rate, cash flow, royalty payment obligations, working capital, liquidity and other financial and accounting measures;
(n)the outcome of current and pending legal proceedings;
(o)awards of patents designed to protect our proprietary technologies both in the U.S. and other countries;
(p)the materiality of any future adjustments to previously recorded reimbursements as a result of the DOE audits and the amount of contributions from the DOE and others towards planned project construction and demonstrations; and
(q)whether any legal challenges or EPA actions will have a material impact on the implementation of the MATS or other regulations and on our ongoing business.
(a)the scheduled expiration of the IRC Section 45 tax credit period in 2021 and the resulting wind down of the business of, and loss of revenue from, Tinuum Group and Tinuum Services;
(b)the production and sale of RC by RC facilities through the remainder of 2021 that will qualify for Section 45 tax credits;
(c)expected growth or contraction in and potential size of our target APT markets, including the water purification, food and beverage and pharmaceuticals markets;
(d)expected supply and demand for our APT products and services;
(e)increasing competition in the APT market;
(f)future level of research and development activities;
(g)the effectiveness of our technologies and the benefits they provide;
(h)probability of any loss occurring with respect to certain guarantees made by Tinuum Group ("Party Guarantees");
(i)the timing of awards of, and work and related testing under, our contracts and agreements and their value;
(j)the timing and amounts of or changes in future revenues, royalties earned, backlog, funding for our business and projects, gross margins, expenses, earnings, tax rates, valuation allowance on our deferred tax assets, cash flows, license royalties, working capital, liquidity and other financial and accounting measures;
(k)the outcome of current legal proceedings;
(l)awards of patents designed to protect our proprietary technologies both in the U.S. and other countries;
(m)the adoption and scope of regulations to control certain chemicals in drinking water; and
(n)opportunities to effectively provide solutions to U.S. coal-related businesses to comply with regulations, improve efficiency, lower costs and maintain reliability.
Our expectations are based on certain assumptions, including without limitation, that:
(a)coal will continue to be a major source of fuel for electrical generation in the United States;
(b)the IRS will allow the production and sale of RC to qualify for Section 45 tax credits;
(c)we will continue as a key supplier of equipment, chemicals and services to the coal-fired power generation industry as it seeks to implement reduction of mercury emissions;
(d)current environmental laws and regulations requiring reduction of mercury from coal-fired boiler flue gases will not be materially weakened or repealed by courts or legislation in the future;
(e)we will be able to meet any performance guarantees we make and to continue to meet our other obligations under contracts;
(f)we will be able to obtain adequate capital and personnel resources to meet our operating needs and to fund anticipated growth and our indemnity obligations;
(g)we will be able to establish and retain key business relationships with other companies;
(h)orders we anticipate receiving will be received;
(i)governmental audits of our costs incurred under DOE contracts will not result in material adjustments to amounts we have previously received under those contracts;
(j)we will be able to formulate new chemicals and blends that will be useful to, and accepted by, the coal-fired boiler power generation business;
(k)we will be able to effectively compete against others;
(l)we will be able to meet any technical requirements of projects we undertake;
(m)Tinuum Group will be able to sell or lease additional RC facilities, including RC facilities that may be returned to Tinuum Group, to third party investors; and
(n)we will be able to utilize our portion of the Section 45 tax credits generated by production and sale of RC from retained facilities.

(a)coal will continue to be a significant source of fuel for electrical generation in the U.S.;
(b)the IRS will allow the production and sale of RC to qualify for Section 45 tax credits through December 31, 2021;
(c)we will continue as a key supplier of consumables to the coal-fired power generation industry as it seeks to implement reduction of mercury emissions;
(d)we will be able to obtain adequate capital and personnel resources to meet our operating needs and to fund anticipated growth and our indemnity obligations;
(e)Cabot will continue to purchase Furnace Products from us under the Supply Agreement in the quantities specified;
(f)we will be able to establish and retain key business relationships with current and other companies;
(g)orders we anticipate receiving will be received;
(h)we will be able to formulate new consumables that will be useful to, and accepted by, the APT markets;
(i)we will be able to effectively compete against others;
(j)we will be able to meet any technical requirements of projects we undertake; and
(k)we will be able to utilize the Section 45 tax credits we have earned before they expire.
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The forward-looking statements included in this Report involve risks and uncertainties. Actual events or results could differ materially from those discussed in the forward-looking statements as a result of various factors including, but not limited to, timing of new and pending regulations and any legal challenges to or extensions of compliance dates of them; the U.S. government’s failure to promulgate regulations or appropriate funds that benefit our business; changes in laws and regulations, accounting rules, prices, economic conditions and market demand; impact of competition; availability, cost of and demand for alternative energy sources and other technologies; technical, start up and operational difficulties; failure of the RC facilities to produce RC; termination of or amendments to the contracts for sale or lease of RC facilities; decreases in the production of RC; our inability to commercialize our APT technologies on favorable terms; our inability to ramp up our operations to effectively address recent and expected growth in our APT business; loss of key personnel; potential claims from any terminated employees, customers or vendors; failure to satisfy performance guarantees; availability of materials and equipment for our businesses; intellectual property infringement claims from third parties; pending litigation; identification of additional material weaknesses or significant deficiencies; as well as other factors relating to our business, as described in our filings with the SEC, with particular emphasis on the risk factor disclosures contained in those filings and in Item 1A - "Risk Factors" of this Report. You are cautioned not to place undue reliance on the forward-looking statements made in this Report and to consult filings we have made and will make with the SEC for additional discussion concerning risks and uncertainties that may apply to our business and the ownership of our securities. The forward-looking statements contained in this Report are presented as of the date hereof, and we disclaim any duty to update such statements unless required by law to do so.

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Item 1A. Risk Factors
Risks relating to our business
The following risks relate to our businessus as of the date this Report is filed with the SEC, or any alternative date specified.SEC. This list of risks is not intended to be exhaustive, but reflects what we believe are the material risks inherent in our business and the ownership of our securities as of the specified dates. A statement to the effect that the occurrence of a specified event may have a negative impact on our business, results of operations, profitability, financial condition, or the like, is intended to reflect the fact that such an event, if it occurs, would be likely to have a negative impact on your investment in the Company,ADES, but should not imply the likelihood of the occurrence of such specified event. The order in which the following risk factors are presented is not intended as an indication of the relative seriousness of any given risk.
Demand for our products and services depends significantly on environmental laws and regulations. Uncertainty asRisks relating to the future of such laws and regulations, as well as changes to such laws and regulations, or granting of extensions of compliance deadlines has had, and will likely continue to have a material effect on our business.
A significant market driver for our existing products and services, and those planned in the future, are present and expected environmental laws and regulations, particularly those addressing the reduction of mercury and other emissions from coal-fired electric generating units. If such laws and regulations are delayed, or are not enacted or are repealed or amended to be less strict, or include prolonged phase-in periods, or are not enforced, our business would be adversely affected by declining demand for such products and services. For example:
The implementation of environmental regulations regarding certain pollution control and permitting requirements has been delayed from time to time due to various lawsuits. The uncertainty created by litigation and reconsiderations of rule-making by the EPA has negatively impacted our business, results of operations and financial condition and will likely continue to do so.
To the extent federal, state, and local legislation mandating that electric power generating companies serving a state or region purchase a minimum amount of power from renewable energy sources such as wind, hydroelectric, solar and geothermal, and such amount lessens demand for electricity from coal-fired plants, the demand for our products and services would likely decrease.
Federal, state, and international laws or regulations addressing emissions from coal-fired electric generating units, climate change or other actions to limit emissions, including public opposition to new coal-fired electric generating units, has caused and could continue to cause electricity generators to transition from coal to other fuel and power sources, such as natural gas, nuclear, wind, hydroelectric and solar. The potential financial impact on us of future laws or regulations or public pressure will depend upon the degree to which electricity generators diminish their reliance on coal as a fuel source. That, in turn, will depend on a number of factors, including the specific requirements imposed by any such laws or regulations, the periods over which those laws or regulations are or will be phased in, the amount of public opposition, and the state and cost of commercial development of related technologies and processes. In addition, Public Utility Commissions ("PUCs") may not allow utilities to charge consumers for, and pass on the cost of, emission control technologies without federal or state mandate. We cannot reasonably predict the impact that any such future laws or regulations or public opposition may have on our results of operations, financial condition or cash flows.
Reduction of coal consumption by U.S. electric power generators could result in less demand for our products and services. If utilities significantly reduce the number of coal-fired electric generating units or the amount of coal burned, without a corresponding increase in the services required at the remaining units, this could reduce our revenues and materially and adversely affect our business, financial condition and results of operations.
The amount of coal consumed for U.S. electric power generation is affected by, among other things, (1) the location, availability, quality and price of alternative energy sources for power generation, such as natural gas, fuel oil, nuclear, hydroelectric, wind, biomass and solar power; and (2) technological developments, including those related to competing alternative energy sources.
Natural gas-fueled generation has been displacing and may continue to displace coal-fueled generation, particularly from older, less efficient coal-powered generators. We expect that many of the new power plants needed to meet increasing demand for electricity generation will be fueled by natural gas because the price of natural gas has remained at relatively low levels after a period of sharp decline, and use of natural gas is perceived as having a lower environmental impact than burning coal. Natural gas-fired plants are cheaper to construct, and permits to construct these plants are easier to obtain, and ongoing costs of natural

gas-fired plants associated with meeting environmental compliance are lower. Possible advances in technologies and incentives, such as tax credits, to enhance the economics of renewable energy sources could make those sources more competitive with coal. Any reduction in the amount of coal consumed by domestic electric power generators, whether as a result of new power plants utilizing alternative energy sources or as a result of technological advances, could reduce the demand for our current products and services, thereby reducing our revenues and materially and adversely affecting our business and results of operations.
Additionally, long-term changes in environmental regulation that threaten or preclude the use of coal or other fossil fuels as a primary fuel source for electricity production, and result in the reduction or closure of a significant number of coal-fired electric generating units, may adversely affect our business, financial condition and results of operations.
The ability of Tinuum Group to generate revenues from the sale or lease of RC facilities to tax equity investors is not assured, and the inability to sell, lease or operate RC facilities to produce and sell RC and generate Section 45 production tax credits could adversely affect our future growth and profitability.
Except for RC facilities that Tinuum Group may retain and operate permanently for its own benefit, Tinuum Group is attempting to sell or lease the remaining RC facilities to third-party investors. The inability of Tinuum Group to successfully lease or sell additional RC facilities to third-party tax equity investors who may receive the benefit of the Section 45 tax credits that are expected to be generated from those RC facilities, as well as RC facilities that may be returned to Tinuum Group over time, would likely have an adverse effect on our future growth and profitability.
Furthermore, if, in the future, electric power generators decide to limit coal-fired generation for economic reasons and/or do not burn and use RC and instead switch to another power or fuel source, Tinuum Group would likely be unable to fully produce and sell the RC and the associated Section 45 production tax credits potentially available from RC facilities over the anticipated term of the Section 45 tax credit program.Refined Coal
The ability to generate Section 45 tax credits from existing operating RC facilities ends in 2021, which could eliminate the desire for investors to further lease RC facilities beyond this date, which wouldwill effectively eliminate Tinuum Group’s and Tinuum Services' income and cash flows from operations and significantly impact our financial condition and results of operations beyond 2021.
A substantial amountSubstantially all of our earnings and cash flows in 2017 are2020 and 2019 were comprised of equity method earnings from Tinuum Group and royalty earningslicense royalties generated from certain of Tinuum Group’s invested RC facilities. For the year ended December 31, 2017,2020, our RC and EC segmentssegment generated segment operating income of $59.9 million and $0.4 million, respectively.$42.7 million. As of December 31, 2017,2020, Tinuum Group has 1723 invested facilities and zerono retained facilities. OfAbsent an extension to the 17 invested facilities, one is currently generating Section 45 tax credits that will no longer generate Section 45 tax credits beyond 2019 andcredit period, the remaining 16 are generating Section 45 tax credits that23 invested facilities will no longer generate Section 45 tax credits beyond 2021. As a result, we believe that substantially all of the invested RC facilities will be returned to Tinuum Group commensurate withupon the expiration of the Section 45 tax credit program.period. If Tinuum Group electscontinues to continue operatingoperate these RC facilities, theirif any, its earnings will be significantly reduced and accordingly, our pro rata share will also be substantially reduced. 
Additionally,We will need to grow the earnings from our ECAPT segment is currently in its infancysubstantially to make up for the earnings we expect to lose from the winding down of our RC segment after the end of 2021, and there can be no assurances we will be able to fully replace these earnings.
From an earnings standpoint, our RC segment has been the larger of our two segments, and the APT segment must grow substantially, either organically or acquisitively, in order to replace earnings from Tinuum Group that will substantially end during the 2020 to 2022-time frame.2021. There can be no assurance that we will be able to increase our ECAPT segment earnings during this time frame2021 or beyond to cover our current operating expenses or to provide a return to shareholders that is comparable to the return currently provided by our RC segment.  If we are not able to cover operating expenses, we could be forced to raise additional capital, significantly reduce our operating expenses or take other alternative actions.
The recent change in income tax rates may make Section 45 production tax credits less attractive, which in turn could adversely affect our resultsability of operations or financial condition.
On December 22, 2017,Tinuum Group to continue to generate revenues from the Tax Cuts and Jobs Actoperation of 2017 (the “Tax Act”) became law. The Tax Act, among other things, lowered the federal income tax rate on corporations from 35% to 21%, effective for the year beginning January 1, 2018. This change to previous higher tax rates could negatively impact tax capacity of current or potentialRC facilities by tax equity investors making Section 45 production tax credits less attractive. At this point, we areis not fully certain howassured, and the tax credit investor market's reactioninability to the Tax Act’s rate changes and other changes could impact our businesses thatoperate RC facilities to produce and sell RC and generate Section 45 production tax credits which could adversely affect our future growth and profitability.
Tinuum Group has successfully sold and leased RC facilities to third party investors. The termination or cancellation of existing RC facility leases, or the cessation of the production of refined coal by existing facilities, in the near term, would likely have an adverse effect on our reported or future results of operations or financial condition.

Market uncertainty created by the lack of guidancegrowth and rulings issued by courts and the IRS related to Section 45 tax credits could inhibit Tinuum Group's ability to lease or sell additional RC facilities or require a restructuring of, or result in the termination of, existing arrangements.
While the Tax Act did not change the provisions of Section 45, the availability of Section 45 tax credits related to the production and sale of RC to taxpayers investing in RC facilities depends upon a number of factors, including the risk assumed by the taxpayer in the RC facility investment transaction. The law addressing when a taxpayer may and may not be considered the producer and seller of RC and avail itself of Section 45 production tax credits is not fully developed and is subject to rulings by courts, interpretations by the IRS and other official pronouncements on tax credit regulations. If rulings, guidance or other pronouncements of courts or the IRS are not definitive or interpreted as allowing the IRS to restrict availability, increase the difficulty, or prohibit or limit the ability of taxpayers to be considered to be the producer and seller of RC and take advantage of Section 45 production tax credits, several aspects of our current and future RC business could be adversely affected. For example, current investors in RC facilities may decide to terminate their existing agreements, or potential investors may reduce the price they are willing to pay for an RC facility or change the structure of the investment to account for perceived risks associated with being considered the producer and seller of RC and the availability of the associated Section 45 production tax credits.
Presently, a group of related tax equity investors accounts for a substantial portion of our earnings from Tinuum Group and any lease renegotiation or termination by these investors or any failure to continue to produce and sell RC at the related investors' RC facilities would have a material adverse effect on our business.
As of December 31, 2017, 11of Tinuum Group’s 28 RC facilities are leased to various affiliated entities. Significant components of our total cash flows come from Tinuum Group's distributions relating to payments received under these leases. These leases have an initial fixed period and then automatically renew, unless terminated at the option of the lessee, for successive one-year terms through 2019 or 2021. If these affiliated entities renegotiated or terminated their leases, or if the utilities where the RC facilities are installed materially reduce their use of RC, these events would have a material adverse effect on our business, results of operations or financial condition. Certain of these affiliated entities have amended their leases from time to time, with some of the amended leases including less favorable terms to Tinuum Group.profitability.
Our RC businesses are joint ventures and managed under operating agreements where we do not have sole control of the decision makingdecision-making process, and we cannot mandate decisions or ensure outcomes.
We oversee our joint ventures under the terms of their respective operating agreements by participating in the following activities: (1) representation on the respective governing boards of directors, (2) regular oversight of financial and operational performance and controls and establishing audit and reporting requirements, (3) hiring of management personnel, (4) technical support of RC facilities, and (5) other regular and routine involvement with our joint venture partners. Notwithstanding this regular participation and oversight, our joint venture partners also participate in the management of these businesses and they may have business or economic interests that divert their attention from the joint venture, or they may prefer to operate the business, make decisions or invest resources in a manner that is contrary to our preferences. Since material business decisions must be made jointly with our joint venture partners, we cannot mandate decisions or ensure outcomes.
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The financial effects of Tinuum Group providing indemnification under performance guarantees of its RC facilities are largely unknown and could adversely affect our financial condition.
Tinuum Group indemnifies certain utilities and lessees of RC facilities for particular risks associated with the operations of those facilities. We have provided limited, joint and several guarantees of Tinuum Group’s obligations under those leases. Any substantial payments made under such guarantees could have a material adverse effect on our financial condition, results of operations and cash flows.
Presently, the GS Affiliates account for a substantial portion of earnings for Tinuum Group and any further lease renegotiation or termination by the GS Affiliates or any failure to continue to produce and sell RC at the GS Affiliates' RC facilities would have a material adverse effect on our business.
As of December 31, 2020, nineof Tinuum Group’s 26 RC facilities are leased to the GS Affiliates. Significant components of our total cash flows come from Tinuum Group's distributions relating to payments received under these leases. These leases may be terminated at the option of the lessee at periodic intervals or upon the occurrence of specified events. In September 2019, Tinuum Group restructured all of the existing leases with the GS Affiliates, which resulted in a decrease in net lease payments for 2020 and 2021. Additional restructurings have occurred on certain GS Affiliate leases in 2020 and 2021, which have also resulted in a decrease in net lease payments for 2020 and 2021. If the GS Affiliates further renegotiate or terminate one or more of their leases, or if the utilities where the RC facilities are installed materially reduce their use of RC, these events would have a material adverse effect on our business, results of operations or financial condition.
Risks relating to our business
The COVID-19 pandemic and ensuing economic downturn has affected, and is expected to continue to affect and pose risks to our business, results of operations, financial condition and cash flows; and other epidemics or outbreaks of infectious diseases may have a similar impact.
In March 2020, the World Health Organization ("WHO") declared the outbreak of COVID-19 a global pandemic, which continues to spread throughout the United States ("U.S.") and the world and has resulted in authorities implementing numerous measures to contain the virus, including travel bans and restrictions, quarantines, shelter-in-place orders, and business limitations and shutdowns. We have been designated by Cybersecurity and Infrastructure Security Agency ("CISA") of the Department of Homeland Security as a critical infrastructure supplier to the energy sector. This designation provides some latitude in continuing to conduct our business operations compared to companies in other industries and markets. While we are unable to accurately predict the full impact that COVID-19 will have on our results from operations, financial condition, liquidity and cash flows due to numerous uncertainties, including the duration and severity of the pandemic and containment measures, our compliance with these measures has impacted our day-to-day operations and could continue to disrupt our business and operations, as well as that of our key customers, suppliers and other counterparties, for an indefinite period of time. To support the health and well-being of our employees, customers, partners and communities, a vast majority of our employees not directly involved in operating our plant have been working remotely since March 2020. In addition, many of our customers are working remotely, which may delay the timing of some orders and deliveries. The disruptions to our operations caused by COVID-19 have resulted, and are expected to continue to result in inefficiencies, delays and additional costs in our manufacturing, sales, marketing, and customer service efforts that we cannot fully mitigate through remote or other alternative work arrangements. Although such disruptions did not have a material adverse impact on our financial results for the first quarter of fiscal 2020, we incurred additional operating costs for the second quarter of fiscal year 2020, which included hazard pay, cleaning costs and sequestration costs related to our operating plant personnel. For 2021, we may see reduced demand for our products due to reduced interaction with our customers and our inability to target new customers and markets.
More generally, the pandemic raises the possibility of an extended global economic downturn and has caused volatility in financial markets, which could affect demand for our products and services and impact our results and financial condition even after the pandemic is contained and the shelter-in-place orders are lifted. For example, a decrease in orders in a given period could negatively affect our revenues in future periods, particularly if experienced on a sustained basis. We will continue to evaluate the nature and extent of the impact of COVID-19 to our business.
As previously disclosed, in April 2020, we entered into a loan (the "PPP Loan") in the amount of $3.3 million through a bank under the Paycheck Protection Program sponsored by the U.S. Small Business Administration ("SBA"). We entered into the PPP Loan to provide additional liquidity in light of our COVID-19-related higher employee costs. Proceeds from the PPP Loan were used to cover a portion of our existing payroll and related expenses, including sequestration pay for certain employees, as well as certain other operating costs as permitted under the Paycheck Protection Program. We expect that current cash and cash
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equivalent balances, inclusive of the PPP Loan, and cash flows that are generated from operations will be sufficient to meet our working capital needs and other capital and liquidity requirements for at least the next 12 months. However, if our business is more adversely impacted by COVID-19 than we expect, and our personnel costs remain higher than budgeted, our cash needs could increase.
Demand for our products and services depends significantly on environmental laws and regulations. Uncertainty as to the future of such laws and regulations, as well as changes to such laws and regulations, or granting of extensions of compliance deadlines has had, and will likely continue to have a material effect on our business.
A significant market driver for our existing products and services, and those planned in the future, are present and expected environmental laws and regulations, particularly those addressing the reduction of mercury and other emissions from coal-fired electricity generating units. If such laws and regulations are delayed, or are not enacted or are repealed or amended to be less strict, or include prolonged phase-in periods, or are not enforced, our business would be adversely affected by declining demand for such products and services. For example:
a.The implementation of environmental regulations regarding certain pollution control and permitting requirements has been delayed from time to time due to various lawsuits. The uncertainty created by litigation and reconsiderations of rule-making by the EPA has negatively impacted our business, results of operations and financial condition and will likely continue to do so.
b.To the extent federal, state, and local legislation mandating that electric power generating companies serving a state or region purchase a minimum amount of power from renewable energy sources such as wind, hydroelectric, solar and geothermal, and such amount lessens demand for electricity from coal-fired plants, the demand for our products and services would likely decrease.
Federal, state, and international laws or regulations addressing emissions from coal-fired electricity generating units, climate change or other actions to limit emissions, including public opposition to new coal-fired electricity generating units, has caused and could continue to cause electricity generators to transition from coal to other fuel and power sources, such as natural gas, nuclear, wind, hydroelectric and solar. The potential financial impact on us of future laws or regulations or public pressure will depend upon the degree to which electricity generators diminish their reliance on coal as a fuel source. That, in turn, will depend on a number of factors, including the specific requirements imposed by any such laws or regulations, the periods over which those laws or regulations are or will be phased in, the amount of public opposition, and the state and cost of commercial development of related technologies and processes. In addition, Public Utility Commissions ("PUCs") may not allow utilities to charge consumers for, and pass on the cost of, emissions control technologies without federal or state mandate. We cannot reasonably predict the impact that any such future laws or regulations or public opposition may have on our results of operations, financial condition or cash flows.
Action by the EPA related to MATS that decreases demand for our mercury removal products could have a material adverse effect on our APT segment.
Performance in our APT segment is largely dependent upon demand for mercury removal related product, which is largely impacted by the amount of coal-based power generation used in the U.S. and the continued regulation of utilities under MATS. In May 2020, the EPA reconsidered and withdrew its 2016 "supplemental finding" associated with the cost benefit analysis of the MATS Rule. In this action, the EPA found that it was not “appropriate and necessary” to regulate HAP emissions from coal- and oil-fired EGUs. However, the EPA expressly stated that the reconsideration neither removed coal- and oil-fired EGUs from the list of sources that must comply with the MATS rule, nor rescinded the MATS Rule, which has remained continuously in effect.ADES joined a number of parties in seeking review of this EPA action before the U.S. Court of Appeals for the D.C. Circuit.President Biden identified EPA’s withdrawal of the supplemental finding as one of the actions to be reviewed for conformity with Biden Administration policy, and in February 2021, the Biden Administration moved that the pending judicial review of the withdrawal be held in abeyance.The Court has granted the administration’s motion, and this appeal is also now in abeyance. The MATS Rule remains in effect.Any final action taken by the EPA related to MATS that decreases demand for our products for mercury removal will have a negative effect on the financial results of our PGI segment. The timing and content of the final reconsideration rule are unknown.
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The failure of tariffs placed on U.S. imports of Chinese activated carbon to adequately address the impact of low-priced imports from China could have a material adverse effect on the competitiveness and financial performance of our APT segment.
Our APT segment faces competition in the U.S. from low-priced imports of activated carbon products. If the volumes of these low-priced imports increase, especially if they are sold at less than fair value, our sales of competing products could decline, which could have an adverse effect on the earnings of our APT segment. In addition, sales of these low-priced imports may negatively impact our pricing. To limit these activities, regulators in the U.S. have enacted an anti-dumping duty order on steam activated carbon products from China. In 2018, the order was extended for an additional five years. The amount of anti-dumping duties collected on imports of steam activated carbon from China is reviewed annually by the U.S. Department of Commerce. To the extent the anti-dumping margins do not adequately address the degree to which imports are unfairly traded, the anti-dumping order may be less effective in reducing the volume of these low-priced activated carbon imports in the U.S., which could negatively affect demand and/or pricing for our AC products.
The market for chemicalsconsumables and other products that provide mercury emissionspollutant reduction is highly competitive and some of our competitors are significantly larger and more established than we are, which could adversely impede our growth opportunities and financial results.
We operate in a highly competitive marketplace. Our ability to compete successfully depends in part upon our ability to maintain a production cost advantage, competitive technological capabilities and to continue to identify, develop and commercialize new and innovative products for existing and future customers. We may face increased competition from existing or newly developed products offered by industry competitors or other companies whose products offer a similar functionality as our products and could be substituted for our products, which may negatively affect demand for our products. In addition, market competition could negatively impact our ability to maintain or raise prices or maintain or grow our market position.
We compete against certain significantly larger and/or more established companies in the market for chemicalsconsumables and other products that provide mercury emissions reduction, including Norit America, Inc.,water treatment and air purification.
Reduction of coal consumption by North American electricity power generators could result in less demand for our products and services. If utilities significantly reduce the number of coal-fired electricity generating units or the amount of coal burned, without a division of Cabot Corporation, Calgon Carbon, ADA Carbon Solutions and Nalco.
We are an early-stage companycorresponding increase in the consumables mercury emissions reduction businessservices required at the remaining units, this could reduce our revenues and materially and adversely affect our chemicals products have been introduced later to the market than many of our competitors’ products. If we are not able to displace current providers of mercury emissions reduction products at coal-fired electric generating units, it would likely have a material adverse effect on our future growth opportunities and business, financial condition and results of operations.

The amount of coal consumed for North American electricity power generation is affected by, among other things, (1) the location, availability, quality and price of alternative energy sources for power generation, such as natural gas, fuel oil, nuclear, hydroelectric, wind, biomass and solar power; and (2) technological developments, including those related to competing alternative energy sources.
Our dependence on certain discrete chemicalsNatural gas-fueled generation and renewable energy generation has been displacing and may continue to displace coal-fueled generation, particularly from older, less efficient coal-powered generators. We expect that a significant amount of the new power generation necessary to meet increasing demand for electricity generation will be fueled by these sources. The price of natural gas has remained competitive for power generation and the use of natural gas is perceived as having a lower environmental impact than burning coal. Natural gas-fired plants are both limitedcheaper to construct, and permits to construct these plants are easier to obtain, and ongoing costs of natural gas-fired plants associated with meeting environmental compliance are lower. Possible advances in supplytechnologies and subject to significant price fluctuations usedincentives, such as tax credits, that enhance the economics of renewable energy sources could make those sources more competitive than coal. Any reduction in the manufacturingamount of coal consumed by domestic electricity power generators, whether as a result of new power plants utilizing alternative energy sources or as a result of technological advances, could reduce the demand for our current products and services, thereby reducing our revenues and materially and adversely affecting our business and results of operations.
Additionally, long-term changes in environmental regulation that threaten or preclude the use of coal or other fossil fuels as a primary fuel source for electricity production may result in the reduction or closure of a significant number of coal-fired electric generating units, and may adversely affect our business, financial condition and results of operations.
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The loss of, or significant reduction in, purchases by our largest customers could adversely affect our business, financial condition or results of operations.
During the year ended December 31, 2020, we derived approximately 61% of our chemicaltotal consumable revenues from our ten largest customers. Many of these customers purchase our products that we sell to comply with emissions regulations, and if coal-fired generation decreases, it may have a negative impact on the amount of consumable products purchased. If any of our ten largest customers, were to significantly reduce the quantities of consumables they purchase from us, it may cause delaysadversely affect our business, financial condition and results of operations.
Volatility in products delivered to customers, delayed revenues, lossprice and availability of customers and increased costs to us.raw materials can significantly impact our results of operations.
The manufacturing and processing of our chemicalconsumable products is dependent uponrequires significant amounts of raw materials. The price and availability of those raw materials can be impacted by factors beyond our control. Our consumable products, exclusive of lignite coal, use a variety of additives. Significant movements or volatility in the costs of additives could have an adverse effect on our working capital or results of operations. Additionally, we obtain certain discrete chemicals thatraw materials from selected key suppliers. While we have inventory of such raw materials, if any of these suppliers are proneunable to significantmeet their obligations with us on a timely basis or at an acceptable price, fluctuations and supply constraints. Further, there are a limited number of suppliers that provide ingredients neededwe may be forced to manufacture our proprietary M-Prove and RESPond chemicals that are used at a customer's coal-fired electric generating unit. This makes us vulnerableincur higher costs to potentialobtain the necessary raw materials.
We may attempt to offset the increase in raw material costs with price increases fromallowed in our suppliers that could negatively impact our gross margins ifcontractual relationships or through cost reduction efforts. If we are unable to fully offset the increased cost of raw materials through price increases, it could significantly impact our business, financial condition and results of operations.
We face operational risks inherent in mining operations and our mining operations have the potential to cause safety issues, including those that could result in significant personal injury.
We own the Five Forks Mine, a lignite coal mine located in Louisiana, which is operated for us by a third party. Mining operations by their nature involve a high level of uncertainty and are often affected by risks and hazards outside of our control. At the Five Forks Mine, the risks are primarily operational risks associated with the maintenance and operation of the heavy equipment required to dig and haul the lignite and risks relating to lower than expected lignite quality or recovery rates. The failure to adequately manage these risks could result in significant personal injury, loss of life, damage to mineral properties, production facilities or mining equipment, damage to the environment, delays in or reduced production and potential legal liabilities.
We also own the Marshall Mine, a former lignite coal mine located in Texas, which ceased mining operations in the third quarter of 2020 and is currently being reclaimed. Reclamation operations by their nature involve a high level of uncertainty and are often affected by risks and hazards outside of our control. At the Marshall Mine, the current risks are primarily operational risks associated with the maintenance and operation of the heavy equipment. The failure to adequately manage these risks could result in significant personal injury, loss of life, equipment, damage to the environment, delays in reclamation and potential legal liabilities.
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Our operations and products are subject to extensive safety, health and environmental requirements that could increase the selling price to our customers. If suppliers are unable to procure discrete chemicals neededcosts and/or impair our ability to manufacture and sell certain products.
Our ongoing operations are subject to extensive federal, state and local laws, regulations, rules and ordinances relating to safety, health and environmental matters, many of which provide for substantial monetary fines and criminal sanctions for violations. These include requirements to obtain and comply with various environmental-related permits for constructing any new facilities (or modifications to existing facilities) and operating all of our chemical products or elect notexisting facilities. In addition, our Red River Plant may become subject to continue to do business with us,greenhouse gas emission trading requirements under which we may be delayed in fulfilling customer ordersrequired to purchase emission credits if our emission levels exceed our allocations. Greenhouse gas regulatory programs that have been adopted, such as cap-and-trade programs, have not had a significant impact on our business to date. Costs of complying with regulations could increase, as concerns related to greenhouse gases and might not be ableclimate change continue to fill orders at all. Delays in our ability to fulfill customer orders emerge. The enactment of new environmental laws and regulations and/or the lossmore aggressive interpretation of any ofexisting requirements could require us to incur significant costs for compliance or capital improvements or limit our suppliers would have a material adverse effect on our EC business, results ofcurrent or planned operations, and financial condition.
The quality and effectiveness of our technologies, products and services may not meet our customers’ expectations.
We utilize and rely on a limited number of suppliers to manufacture our proprietary M-Prove and RESPond chemicals. If these products are not manufactured to the standards and specifications that we have promised to our customers, we may suffer damage to our reputation and our customers may seek alternative products from competitors to fulfill their emissions reductions needs. In addition, if we have flaws in our service deliverables of delivery, installation, and performance testing and in our evaluation of our technologies, we could experience the loss of customers and resultant lower revenues. Historically, we have had minimal returns of chemicals sold to our customers due to non-compliance with agreed-upon specifications. While our suppliers are responsible and liable for any costs incurred to re-supply chemical products to our customers, including liability for liquidated damages, repair, replacement or service costs and for potential damage to our reputation, we have provided warranties and performance guarantees for certain ACI and DSI systems we have sold. Under those contractual arrangements, we are responsible for repair or replacement costs and certain operating costs within the limits provided by the contracts, if the agreed specifications are not met. Our efforts to monitor, develop, modify and implement acceptable chemicals and emissions reductions solutions may not be sufficient to avoid failures and meet performance criteria that may result in dissatisfied or lost customers, damage to our reputation, each of which could have a material adverse effect on our business,earnings or cash flow. We attempt to offset the effects of these compliance costs through price increases, productivity improvements and cost reduction efforts, and our success in offsetting any such increased regulatory costs is largely influenced by competitive and economic conditions and could vary significantly depending on the segment served. Such increases may not be accepted by our customers, may not be sufficient to compensate for increased regulatory costs or may decrease demand for our products and our volume of sales.
We may not be successful in achieving our growth expectations related to new products in our existing or new markets.
We may not be successful in achieving our growth expectations from developing new products for our existing or new markets. Further, we cannot ensure costs incurred to develop new products will result in an increase in revenues. Additionally, our ability to bring new products to the market will depend on various factors, including, but not limited to, solving potential technical or manufacturing difficulties, competition and market acceptance, which may hinder the timeliness and cost to bring such products to production. These factors or delays could affect our future operating results.
We may make future acquisitions or form partnerships and joint ventures that may involve numerous risks that could impact our financial condition, results of operations and cash flows.
Our strategy may include expanding our scope of products and services organically or through selective acquisitions, investments or creating partnerships and joint ventures. We have acquired, and may selectively acquire, other businesses, product or service lines, assets or technologies that are complementary to our business. We may be unable to find or consummate future acquisitions at acceptable prices and terms, or we may be unable to integrate existing or future acquisitions effectively and efficiently, and may need to divest those acquisitions. We continually evaluate potential acquisition opportunities in the ordinary course of business. Acquisitions involve numerous risks, including among others:
our evaluation of the synergies and/or long-term benefits of an acquired business;
integration difficulties, including challenges and costs associated with implementing systems, processes and controls to comply with the requirements of a publicly-traded company;
diverting management’s attention;
litigation arising from acquisition activity;
potential increased debt leverage;
potential issuance of dilutive equity securities;
entering markets in which we have no or limited direct prior experience and where competitors in such markets have stronger market positions;
unanticipated costs and exposure to undisclosed or unforeseen liabilities or operating challenges;
potential goodwill or other intangible asset impairments;
potential loss of key employees and customers of the acquired businesses, product or service lines, assets or technologies;
our ability to properly establish and maintain effective internal controls over an acquired company; and
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increasing demands on our operational and IT systems.
The success of acquisitions of businesses, new technologies and products, or arrangements with third parties is not always predictable and we may not be successful in realizing our objectives as anticipated. The Senior Term Loan and our bank line of credit facility contain certain covenants that limit, or that may have the effect of limiting, among other things, the payment of dividends, acquisitions, capital expenditures, the sale of assets and incurring additional indebtedness.
Natural disasters could affect our operations and financial condition.results.
We operate facilities, including the Red River Plant and Five Forks Mine, that are exposed to natural hazards, such as floods, windstorms and hurricanes. Extreme weather events present physical risks that may become more frequent as a result of factors related to climate change. Such events could disrupt our supply of raw materials or otherwise affect production, transportation and delivery of our products or affect demand for our products.
In addition, extreme and unusually cold or hot temperatures throughout the U.S. could result in abnormally high loads on geographic electrical grids that could result in the failure of coal-fired power plants to produce electricity. If these plants were off-line for a significant period of time, the demand for our products could be less, which would impact our operations and financial results.
Information technology vulnerabilities and cyberattacks on our networks could have a material adverse impact on our business.
We rely on information technology ("IT") to manage and conduct business, both internally and externally, with our customers, suppliers and other third parties. Internet transactions involve the transmission and storage of data including, in certain instances, customer and supplier business information. Therefore, maintaining the security of computers and other electronic devices, computer networks and data storage resources is a critical issue for us and our customers and suppliers because security breaches could result in reduced or lost ability to carry on our business and loss of and/or unauthorized access to confidential information.
We have limited personnel and other resources to address information technology reliability and security of our computer networks and to respond to known security incidents to minimize potential adverse impact. Experienced hackers, cybercriminals and perpetrators of threats may be able to penetrate our network security and misappropriate or compromise our confidential information or that of third parties, create system disruptions or cause shutdowns. These perpetrators of cyberattacks also may be able to develop and deploy viruses, worms, malware and other malicious software programs that attack our information and networks or otherwise exploit any security vulnerabilities of our information and networks.
Techniques used to obtain unauthorized access to or sabotage systems change frequently and often are not recognized until long after being launched against a target, and we may be unable to anticipate these techniques or to implement adequate preventative measures. A breach of our IT systems and security measures as a result of third party action, malware, employee error, malfeasance or otherwise could materially adversely impact our business and results of operations and expose us to customer, supplier and other third party liabilities.
Risks related to intellectual property
Failure to protect our intellectual property or infringement of our intellectual property by a third party could have an adverse impact on our financial condition.
We rely on a combination of patent, copyright and trademark laws, trade secrets, confidentiality procedures and contractual provisions to protect our proprietary rights. Such means of protecting our proprietary rights may not be adequate because they provide only limited protection or such protection may be prohibitively expensive to enforce. We also enter into confidentiality and non-disclosure agreements with our employees, consultants and many of our customers and vendors, and generally control access to and distribution of our proprietary information. Notwithstanding these measures, a third party could copy or otherwise obtain and use our proprietary information without authorization. We cannot provide assurance that the steps we have taken will prevent misappropriation of our technology and intellectual property, which could negatively impact our business and financial condition. In addition, such actions by third parties could divert the attention of our management from the operation of our business.
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We may be subject to intellectual property infringement claims from third parties that are costly to defend and that may limit our ability to use the disputed technologies.
If our technologies are alleged to infringe the intellectual property rights of others, we may be forced to mount a defense to such claims, which may be expensive and time consuming. During the pendency of litigation, we could be prevented from continuing sales ofmarketing and selling existing products or services and from pursuing research, development or commercialization of new or complimentary products or services. Further, we may be required to obtain licenses to third-partythird party intellectual property or be forced to develop or obtain alternative technologies. Our failure to obtain a license to a technology that we may require, or the need to develop or obtain alternative technologies, could significantly and negatively affect our business.

Agreements to indemnifyIndemnification of third-party licensees of our technologies against intellectual property infringement claims concerning our licensed technology and our products could be financially significant to us.
We have agreed to indemnify licensees of our technologies (including Tinuum Group) and purchasers of our products, and we may enter into additional agreements with others under which we agree to indemnify and hold them harmless from losses they may incur as a result of the alleged infringement of third-party rights caused by the use of our technologies and products. Infringement claims, which are expensive and time-consuming to defend, could have a material adverse effect on our business, operating results and financial condition, even if we are successful in defending ourselves (and the indemnified parties) against them.
Our future success depends in part on our ongoing identification and development of intellectual property and our ability to invest in and deploy new products, services and technologies into the marketplace efficiently and cost effectively.
The process of identifying customer needs and developing and enhancing products, services and solutions for our business segments is complex, costly and uncertain. Any failure by us to identify and anticipate changing needs, emerging trends and new regulations could significantly harm our future market share and results of operations. Historically, our approach to technology development, implementation and commercialization of products has focused on quickly taking technology to full-scale testing and enhancing it under actual power plant operating conditions. We continue to review and adjust methods to deploy products, services and technologies to our customers. Our results are subject to risks
Risk related to our investments in new technologies, products and services, but if we are unable to develop and scale up new technologies, products or services to meet the needs of our customers, our business and financial results would be adversely affected.
The effects of Tinuum Group providing payment under performance guarantees of its RC facilities are largely unknown and could adversely affect our financial condition.
Tinuum Group indemnifies certain utilities and lessees of RC facilities for particular risks associated with the operations of those facilities. We have provided limited, joint and several guarantees of Tinuum Group’s obligations under those leases. Any substantial payments made under such guarantees could have a material adverse effect on our financial condition, results of operations and cash flows.
Material adjustments pursuant to DOE audits of our past performance could have a detrimental impact on our business.
Certain of our completed and current contracts awarded by the DOE and related industry participants remain subject to government audits. Our historical experience with these audits has not resulted in significant adverse adjustments to reimbursement amounts previously received; however audits for the years 2013 and later have not been finalized. If the results of future audits require us to repay material amounts, our results of operations and business would likely suffer material adverse impacts.
We may make future acquisitions or form partnerships and joint ventures that may involve numerous risks that could impact our financial condition, results of operations and cash flows.
Our strategy may include expanding our scope of products and services organically or through selective acquisitions, investments or creating partnerships and joint ventures. We have acquired, and may selectively acquire, other businesses, product or service lines, assets or technologies that are complementary to our business. We may be unable to find or consummate future acquisitions at acceptable prices and terms, or we may be unable to integrate existing or future acquisitions effectively and efficiently and may need to divest those acquisitions. We continually evaluate potential acquisition opportunities in the ordinary course of business. Acquisitions involve numerous risks, including among others:
integration difficulties, including challenges and costs associated with implementing systems and processes to comply with requirements of being part of a publicly-traded company;
diverting management���s attention from normal daily operations of the business;
entering markets in which we have no or limited direct prior experience and where competitors in such markets have stronger market positions;
unanticipated costs and exposure to undisclosed or unforeseen liabilities or operating challenges;

potential loss of key employees and customers of the acquired businesses, product or service lines, assets or technologies;
our ability to properly establish and maintain effective internal controls over an acquired company; and
increasing demands on our operational and IT systems.
The success of acquisitions of businesses, new technologies and products, or arrangements with third parties is not always predictable and we may not be successful in realizing our objectives as anticipated. We may not be able to integrate any acquired businesses successfully into our existing businesses, make such businesses profitable, or realize anticipated cost savings or synergies, if any, from these acquisitions, which could adversely affect our results of operations and financial condition. In addition, acquisitions of businesses may require additional debt or equity financing, resulting in additional leverage or dilution of equity ownership. Our loan agreements contain certain covenants that limit, or that may have the effect of limiting, among other things, acquisitions, capital expenditures, the sale of assets and the incurrence of additional indebtedness.tax matters
An “ownership change”"ownership change" could limit our ability to utilize tax loss and credit carryforwards to offset future taxable income.
We have certain general business credit tax credits (“("Tax Attributes”Credits"). As of December 31, 2017,2020, we had $100.4$93.9 million of Tax Attributes,Credits, equaling 88%86% of our total gross deferred tax assets. Our ability to use these Tax AttributesCredits to offset future taxable income may be significantly limited if we experience an “ownership change”"ownership change" as discussed below.
On May 5, 2017, the Board of Directors ("Board") approved the Tax Asset Protection Plan (the “Protection Plan”) and declared a dividend of one preferred share purchase right (each, a “Right”) for each outstanding share of our common stock. The Protection Plan was adopted in an effort to protect stockholder value by attempting to diminish the risk that our ability to use the Tax Attributes to reduce potential future federal income tax obligations may become substantially limited. Under the IRCInternal Revenue Code ("IRC') and regulations promulgated by the U.S. Treasury Department, we may carry forward or otherwise utilize the Tax AttributesCredits in certain circumstances to offset any current and future taxable income, and thus reduce our federal income tax liability, subject to certain requirements and restrictions. To the extent that the Tax AttributesCredits do not otherwise become limited, we believe that we will have available a significant amount of Tax AttributesCredits in future years, and therefore the Tax AttributesCredits could be a substantial asset to us. However, if we experience an “ownership"ownership change," as defined in SectionSections 382 and 383 of the IRC, our ability to use the Tax AttributesCredits may be substantially limited, and the timing of the usage of the Tax AttributesCredits could be substantially delayed, which could therefore significantly impair the value of that asset.
In general, an “ownership change” for tax purposes"ownership change" under Sections 382 and 383 occurs if the percentage of stock owned by an entity’s 5% stockholders (as defined for tax purposes) increases by more than 50 percentage points over a rolling three-year period. An entity that experiences an ownership change generally will be subject to an annual limitation on its pre-ownership change tax loss and credit carryforwards equal to the equity value of the entity immediately before the ownership change, multiplied by the long-term, tax-exempt rate posted monthly by the IRS (subject to certain adjustments). The annual limitation would be increased each year to the extent that there is an unused limitation in a prior year. The limitation on our ability to utilize the Tax AttributesCredits arising from an ownership change under SectionSections 382 and 383 of the IRC would depend on the value of our equity at the time of any ownership change.  If we were to experience an “ownership"ownership change," it is possible that a significant portion of our tax loss and credit carryforwards could expire before we would be able to use them to offset future taxable income.
TheOn May 5, 2017, our Board of Directors (the "Board") approved the Tax Asset Protection Plan (the "TAPP") and declared a dividend of one preferred share purchase right (each, a "Right") for each outstanding share of our common stock. The TAPP was adopted in an effort to protect stockholder value by attempting to diminish the risk that our ability to use the Tax Credits to reduce potential future federal income tax obligations may become substantially limited.
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On April 8, 2020, the Board approved the Third Amendment to the TAPP ("Third Amendment") that amended the TAPP, as previously amended by the First and Second Amendments that were approved by the Board on April 6, 2018 and April 5, 2019, respectively. The Third Amendment amended the definition of "Final Expiration Date" under the TAPP to extend the duration of the TAPP and makes associated changes in connection therewith. At our 2020 annual meeting of stockholders, our stockholders approved the Third Amendment, thus the Final Expiration Date will be the close of business on December 31, 2021.
The TAPP, as amended, is intended to act as a deterrent to any person acquiring beneficial ownership of 4.99% or more of our outstanding common stock without the approval of the Board. Stockholders who beneficially owned 4.99% or more of our outstanding common stock upon execution of the Protection Plan will not trigger the Protection Plan so long as they do not acquire beneficial ownership of additional shares of Common Stock.our common stock. The Board may, in its sole discretion, also exempt any person from triggering the Protection Plan.
Changes in taxation rules or financial accounting standards could adversely affect our results of operations or financial condition.
Changes in taxation rules and accounting pronouncements (and changes in interpretations of accounting pronouncements) have occurred and may occur in the future.
The Tax Act, among other things, reduced the U.S. federal corporate tax rate from 35 percent to 21 percent, beginning January 1, 2018. As a result, as of December 31, 2017, we reduced our net deferred tax assets for the reduction in the federal rate in the

amount of $5.8 million, which increased our income tax expense by this amount for the year ended December 31, 2017. Our assessment and accounting for the income tax effects of the Tax Act affecting our consolidated financial statements is generally complete, subject to continued evaluation under the SEC Staff Accounting Bulletin 118 ("SAB 118"), which provides guidance on accounting for the tax effects of the Tax Act. We do not anticipate any other impacts to have a material adverse impact to our financial condition, results of operations and cash flows; however, our evaluation is ongoing and our conclusions are preliminary.
Information technology vulnerabilities and cyberattacks on our networks could have a material adverse impact on our business.
We rely upon information technology ("IT") to manage and conduct business, both internally and externally, with our customers, suppliers and other third parties. Internet transactions involve the transmission and storage of data including, in certain instances, customer and supplier business information. Therefore, maintaining the security of computers and other electronic devices, computer networks and data storage resources is a critical issue for us and our customers and suppliers because security breaches could result in reduced or lost ability to carry on our business and loss of and/or unauthorized access to confidential information. We have limited personnel and other resources to address information technology reliability and security of our computer networks and to respond to known security incidents to minimize potential adverse impact. Experienced hackers, cybercriminals and perpetrators of threats may be able to penetrate our network security and misappropriate or compromise our confidential information or that of third parties, create system disruptions or cause shutdowns. These perpetrators of cyberattacks also may be able to develop and deploy viruses, worms, malware and other malicious software programs that attack our information and networks or otherwise exploit any security vulnerabilities of our information and networks. Techniques used to obtain unauthorized access to or sabotage systems change frequently and often are not recognized until long after being launched against a target, and we may be unable to anticipate these techniques or to implement adequate preventative measures. A breach of our IT systems and security measures as a result of third-party action, malware, employee error, malfeasance or otherwise could materially adversely impact our business and results of operations and expose us to customer, supplier and other third-party liabilities.
Risks relating to our common stock
Our stock price is subject to volatility.
The market price of our common stock has experienceexperienced substantial price volatility in the past and may continue to do so. The market price of our common stock may continue to be affected by numerous factors, including:
a.actual or anticipated fluctuations in our operating results and financial condition;
b.changes in laws or regulations and court rulings and trends in our industry;
c.The expiration of the Section 45 Tax credit period and/or Tinuum Group’s ability to lease or sell RC facilities;
d.announcements of sales awards;
e.changes in supply and demand of components and materials;
f.adoption of new tax regulations or accounting standards affecting our industry;
g.changes in financial estimates by securities analysts;
h.perceptions of the value of corporate transactions;
our ability to continue to bei.trends in social responsibility and investment guidelines;
j.whether we are able and elect to pay cash dividendsdividends;
k.the numbercontinuation of repurchasing shares of common stock repurchased under stock repurchase programsprograms; and
l.the degree of trading liquidity in our common stock and general market conditions.

From January 1, 20162019 to December 31, 2017,2020, the closing price of our common stock ranged from $3.27$3.76 to $12.08$14.84 per share. In June 2017, we commenced a quarterly cash dividend program and paid out cash dividends in July, Septembereach succeeding quarter through March 31, 2020. In 2019 and December 2017. In May 2017,2020, we executed a modified Dutch Auction tender offerimplemented stock repurchase programs, and repurchased 1,370,891 sharesa total of our common stock. In December 2017, the Board authorized a stock repurchase program pursuant to which we may repurchase up to $10.0 million of our outstanding common stock from time to time. As of December 31, 2017, we had purchased 342,875553,958 shares of our common stock under this stock repurchase program.for the fiscal years 2019 and 2020 for cash of $6.0 million.
Stock price volatility over a given period may cause the average price at which we repurchase shares of our common stock to exceed the stock’s price at a given point in time. We believe our stock price should reflect expectations of future growth and profitability. Future dividends are subject to declaration by the Board, and under our current stock repurchase program, we are not obligated to acquire any specific number of shares. If we fail to meet expectations related to future growth, profitability, dividends, stock repurchases or other market expectations, our stock price may decline significantly, which could have a material adverse impact on our ability to obtain additional capital, investor confidence and employee retention, and could further reduce the liquidity of our common stock.
There can be no assurance that we will continue to declareresume declaring cash dividends at all or in any particular amounts.
We last paid a cash dividend on March 10, 2020. The Board first approved a $0.25 per share of common stock quarterly dividend in June 2017. During 2017,2019 and 2020, we declared three quarterly dividends in the aggregate amount of $15.8$23.2 million. We intend to continue to pay quarterly dividends subject to capital availability and periodic determinations by our Board that cash dividends are in the best interest of our stockholders and are in compliance with all laws and agreements applicable to the declaration and
22


The payment of cashfuture dividends by us. Future dividends maywill be affected by, among other factors: compliance with debt covenants; our views on potential future capital requirements for investments in acquisitions; legal risks; stock repurchase programs; changes in federal and state income tax laws or corporate laws; changes to our business model; and our increased interest and principal payments for 2021 required by our outstanding indebtednessunder the terms of the Senior Term Loan; and any additional indebtedness that we may incur in the future.
Under a covenant provided for the Senior Term Loan that requires a minimum for expected future net cash flows from refined coal business, as of December 31, 2020, we are precluded from paying dividends or repurchasing shares of our common stock until such time that we repay all outstanding principal and accrued interest related to the Senior Term Loan, absent a modification to the Senior Term Loan.
Our dividend payments may change from time to time, and we cannot provide assurance that we will continue to declareresume paying dividends at all or in any particular amounts. A reduction in ourOur election to not resume dividend payments could have a negative effect on our stock price.
Our certificate of incorporation and bylaws contain provisions that may delay or prevent an otherwise beneficial takeover attempt of us.
Certain provisions of our certificate of incorporation and bylaws could make it more difficult for a third party to acquire us, even if doing so would be beneficial to our stockholders. These include provisions that:

a.Limit the business at special meetings to the purpose stated in the notice of the meeting;
b.Authorize the issuance of “blank check”"blank check" preferred stock, which is preferred stock with voting or other rights or preferences that could impede a takeover attempt and that the Board can create and issue without prior stockholder approval;
c.Establish advance notice requirements for submitting nominations for election to the Board and for proposing matters that can be acted upon by stockholders at a meeting; and
d.Require the affirmative vote of the "disinterested" holders of a majority of our common stock to approve certain business combinations involving an "interested stockholder" or its affiliates, unless either minimum price criteria or procedural requirements are met, or the transaction is approved by a majority of our "continuing directors" (known as "fair price provisions").
These provisions, alone or in combination with each other, may discourage transactions involving actual or potential changes of control, including transactions that otherwise could involve payment of a premium over prevailing market prices to holders of our common stock, or could limit the ability of our stockholders to approve transactions that they may deem to be in their best interest.

An increased focus on environmental, social and governance factors by institutional investors may negatively impact our access to capital and the liquidity of our stock price.
Some institutional investors have recently adopted Environmental, Social and Governance ("ESG") investing guidelines that may prevent them from increasing or taking new stakes with companies with exposure to fossil fuels. Additional institutional investors may adopt similar ESG investment guidelines. This could limit the demand for owning our common stock and/or our access to capital. If such capital is desired, we cannot assure you that we will be able to obtain any additional equity or debt financing on terms that are acceptable to us. Given these emerging trends, liquidity in our common stock and our stock price may be negatively impacted.
We may require additional funding for our growth plans, and such funding may require us to issue additional shares of our common stock, resulting in a dilution of your investment.
We estimate our funding requirements in order to implement our growth plans. If the funding requirements required to implement growth plans should exceed these estimates significantly, or if we come across opportunities to grow through expansion plans which cannot be predicted at this time, andor our funds generated from our operations prove insufficient for such purposes, we may need to raise additional funds to meet these funding requirements.
These additional funds may be raised by issuing equity or debt securities or by borrowing from banks or other resources. We cannot assure you that we will be able to obtain any additional financing on terms that are acceptable to us, or at all. If we fail to
23


obtain additional financing on terms that are acceptable to us, we willmay not be able to implement such plans fully. Such financing, even if obtained, may be accompanied by conditions that limit our ability to pay dividends or require us to seek lenders’ consent for payment of dividends, or restrict our freedom to operate our business by requiring lender’s consent for certain corporate actions. Further, if we raise additional funds through the issuance of new shares of our common stock, any shareholders who are unable or unwilling to participate in such an additional round of fund raising may suffer dilution of their investment.
Item 1B. Unresolved Staff Comments
None.
Item 2. Properties
OfficeOffices and Warehouse LeasesFacilities
We lease office space in Greenwood Village, Colorado for our corporate headquarters and primary laboratory comprising approximately 21,000 square feet.
We also lease or own manufacturing, storage and distribution facilities in Louisiana. Our manufacturing plant is located on approximately 59 acres and the remaining facilities are comprised of a total of approximately 310,000 square feet.
Mining
As of December 31, 2017,2020, we owned or controlled primarily through long-term leases approximately 4,570 acres of coal land for surface mining. Of those acres, approximately 1,980 acres are located in Natchitoches Parish, Louisiana ("Five Forks"). The majority of the Five Forks land is leased for mineral rights and right-of-use purposes that expire at varying dates over the next 30 years and contain options to renew. The remaining land is owned by us.
Under our current mining plans, substantially all leased reserves will be mined out within the period of existing leases or within the time period of assured lease approximately 9,785 square feetrenewals. Royalties are paid to lessors either as a fixed price per ton or as a percentage of office spacethe gross sales price of the mined coal. The majority of the significant leases are on a percentage royalty basis. In some cases, a payment is required either at the time of execution of the lease or in Highlands Ranch, Colorado,annual installments. In most cases, the prepaid royalty amount is applied to reduce future production royalties.
The remaining 2,590 acres (of 4,570 acres of coal land for surface mining) were acquired on September 30, 2020 and located in Harrison and Panola Counties, Texas. Mining operations on this land ceased in the third quarter of 2020.
In 2018, the SEC issued new rules for disclosures under this Item for mining registrants. These rules amend Item 102 of Regulation S-K under the Securities Act and the Exchange Act and rescind Industry Guide 7 to direct mining registrants, and create a new subpart of Regulation S-K, which serves as our corporate headquarters. This lease wascontains all of the requirements for property disclosures by mining registrants from and after January 1, 2021 (the "Mining Disclosures"). The Mining Disclosures became effective on February 25, 2019 and allow mining registrants a transition period through January 1, 2021 to comply. We elected to adopt the Mining Disclosures effective February 28, 201725, 2019 and expireswere subject to the requirements effective with the filing of our Annual Report on May 31, 2020.
As ofForm 10-K for the fiscal year ended December 31, 2017,2018. Based on the materiality and the vertically-integrated company guidelines contained in the Mining Disclosures, we lease approximately 7,559 square feet of warehouse space in Highlands Ranch, Colorado, which expires in February 2019 and contains an optionhave concluded that no additional disclosures related to renew for two additional five-year periods.our mining operations are required under this Item.
Item 3. Legal Proceedings
From time to time, we are involved in various litigation matters arising in the ordinary course of our business. Information with respect to this item may be found in Note 4 “Commitments14 "Commitments and Contingencies”Contingencies" to the consolidated financial statements included in Item 8 of this Report.


Item 4. Mine Safety Disclosures
Not applicable.The statement concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K is included in Exhibit 95 to this Report.

24




PART II
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Market for Our Common Stock
As of December 31, 2017,2020, our common stock was quoted on the NASDAQ Global Market under the symbol "ADES." The table below sets forth the price range of our common stock for each quarter of 2017 and 2016, as well as dividends per common share declared in such quarter.
  High Low Dividends
2017      
First quarter $12.08
 $9.19
 $
Second quarter 9.99
 8.19
 0.25
Third quarter 11.21
 9.02
 0.25
Fourth quarter 12.01
 8.02
 0.25
       
2016      
First quarter $8.18
 $3.27
 $
Second quarter 8.19
 6.20
 
Third quarter 8.60
 6.40
 
Fourth quarter 9.89
 7.53
 
For the period beginning February 3, 2015 through July 6, 2016, our common stock traded on the OTC Pink® Marketplace - Limited Information Tier ("OTC") under the symbol ADES. The OTC quotations for this period reflected inter-dealer prices, without retail mark-up, markdown or commissions, and, as such, were not necessarily representative of actual transactions or the value of our common stock.

The trading volume for our common stock is relatively limited. There is no assurance that an active trading market will provide adequate liquidity for our existing stockholders or for persons who may acquire our common stock in the future.
Dividends
Prior to June 2017, we had never paid dividends. In June 2017, we commenced a quarterly cash dividend program. Beginning in the June 2017 quarter, we declared quarterly cash dividendsprogram of $0.25 per common share which were paid on July 17, 2017, September 7, 2017 and December 6, 2017. Our ability to pay dividendsmade our most recent payment in March 2020.
In the future, will be dependent upon earnings, financial condition and other factors considered relevant by the Board of Directors ("Board") and will be subject to limitations imposed under Delaware law.
We intend to continue towe may declare and pay a cash dividend on shares of our common stock on a quarterly basis.stock. Whether we do, however, and the timing and amounts of dividends will be subject to approval and declaration by ourthe Board and will depend on a variety of factors including, but not limited to, our financial results, cash requirements, financial condition, compliance with loan covenants and other contractual restrictions and other factors considered relevant by our Board.
Performance Graph
The following performance graph illustrates a five-year comparison of cumulative total return of our common stock, the Russell 3000 IndexBoard, and a select industry peer group ("Peer Group") for the period beginning on December 31, 2012 and ending on December 31, 2017. The graph assumes an investment of $100 on December 31, 2012 and assumes the reinvestment of all dividends.

The performance graph is not intended towill be indicative of future performance. The performance graph shall not be deemed "soliciting material" or to be "filed" with the SEC for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilitieslimitations imposed under that Section, and shall not be deemed to be incorporated by reference into any of the Company’s filings under the Securities Act or the Exchange Act.


Five Year Cumulative Total Shareholder Return Comparison
Advanced Emissions Solutions Return Relative to the Russell 3000 Index and Select Industry Peer Group

The select industry Peer group includes the following: American Vanguard Corp., Calgon Carbon Corporation, CECO Environmental Corp., Clean Energy Fuels Corp., FutureFuel Corp., Fuel-Tech, Inc., Flotek Industries Inc., Hawkins Inc., KMG Chemicals Inc., Lydall Inc., Rentech, Inc., and TerraVia Holdings, Inc.Delaware law.
Holders
The number of holders of record of our common stock as of March 2, 20181, 2021 was approximately 900. The approximate number of beneficial stockholders is estimated at 4,372.6,900.
Purchases of Equity Securities by the Company and Affiliated Purchasers
InWe had no repurchases of our common stock for the three months ended December 2017, our Board authorized31, 2020.
We maintain a program for us to repurchase up to $10.0$20.0 million of shares of our common stock under a stock repurchase program (the "Stock Repurchase Program") through open market transactions at prevailing market prices. ThisThe Board most recently approved an amendment to The Stock Repurchase Program in which it authorized an incremental $7.1 million, resulting in a total of $10.0 million allowable to repurchase. As of December 31, 2020, $7.0 million remained outstanding to repurchase shares of our common stock repurchase programunder the Stock Repurchase Program, which will remain in effect until December 31, 2018 unlessall amounts are utilized or it is otherwise modified by the Board. The following table summarizes the common stock repurchase activity for the three months ended December 31, 2017:

Period (a) Total number of shares (or units) purchased (b) Average price paid per share (or unit) (c) Total number of shares (or units) purchased as part of publicly announced programs 
(d) Maximum number (or approximate dollar value) of shares (or units) that may yet be purchased under the plans or programs (in thousands)
October 1 to 31, 2017 
 $
 
 $
November 1 to 30, 2017 
 
 
 
December 1 to 31, 2017 342,875
 9.82
 342,875
 6,627
Total 342,875
 $9.82
 342,875
 $6,627

Item 6. Selected Financial Data
Five-year Summary of Selected Financial Data

The following selected financial data are derived from the audited Consolidated Financial Statements for the years ended December 31, 2017, 2016, 2015, 2014 and 2013 and shouldinformation under this Item is not required to be read in conjunction with Item 1A, Item 7 and our Consolidated Financial Statements and the related notes included in Item 8 of this Report.provided by smaller reporting companies.
25
  Years Ended December 31,
(in thousands, except per share amounts) 2017 2016 2015 2014 2013
Statement of operations data: 
 
 
 
 
Revenues $35,692
 $50,622
 $62,739
 $16,923
 $13,286
Earnings from equity method investments $53,843
 $45,584
 $8,921
 $42,712
 $15,502
Royalties, related party $9,672
 $6,125
 $10,642
 $6,410
 $2,505
Income tax (benefit) expense (1)
 $24,152
 $(60,938) $20
 $296
 $463
Net income (loss) (2) (3)
 $27,873
 $97,678
 $(30,141) $1,387
 $(15,987)
Net income (loss), per common share, basic (4)
 $1.30
 $4.40
 $(1.37) $0.06
 $(0.78)
Net income (loss), per common share, diluted (4) (5)
 $1.29
 $4.34
 $(1.37) $0.06
 $(0.78)
Dividends declared per common share $0.75
 $
 $
 $
 $


  As of December 31,
(in thousands) 2017 2016 2015 2014 2013
Balance sheet data: 
 
 
 
 
Total assets $82,618
 $107,296
 $60,775
 $93,699
 $73,524
Total debt $
 $
 $28,025
 $15,910
 $
Stockholders’ equity (deficit) $73,455
 $76,165
 $(24,978) $(697) $(6,167)

(1) As described in Note 12 of the Consolidated Financial Statements included in Item 8 of this Report, during the fourth quarter of 2016, the Company released $61.4 million of the valuation allowance related to the deferred tax assets, which resulted in an income tax benefit during 2016 of $60.9 million. During 2017, the Company recorded an income tax expense of $24.2 million, inclusive of the impact of the Tax Act, which increased the Company's income tax expense by $5.8 million.
(2) As described in Note 18 of the Consolidated Financial Statements included in Item 8 of this Report, during the years ended December 31, 2016 and 2015, we recorded restructuring charges of $1.6 million and $10.4 million, respectively. Additionally, during the year ended December 31, 2014, we recorded restructuring charges of $3.5 million. The restructuring charges were recorded in connection with a reduction in force, the departure of executive officers and management's further alignment of the business with strategic objectives.
(3) As described in Note 2 of the Consolidated Financial Statements included in Item 8 of this Report, on February 10, 2014, we purchased a 24.95% membership interest in RCM6, which owns a single RC facility that produces and sells RC that qualifies for Section 45 tax credits, from Tinuum Group through an up-front payment of $2.4 million and an initial note payable to Tinuum Group of $13.3 million. During the year ended December 31, 2016, the Company recognized equity method losses related to RCM6 of $0.6 million. On March 3, 2016, the Company sold its 24.95% membership interest in RCM6 for a cash payment of $1.8 million and assumption of the outstanding note payable made by the Company in connection with its purchase of RCM6 membership interests from Tinuum Group in February 2014, resulting in a $2.1 million gain being recognized during 2016.
(4) For the year ended December 31, 2013, the number of common shares and per common share amounts have been retroactively restated to reflect the two-for-one stock split of our common stock, which was effected in the form of a common stock dividend distributed on March 14, 2014.
(5) For the years ended December 31, 2015 and 2013, the computation of diluted net loss per common share was the same as basic net loss per common share as the inclusion of potentially dilutive securities for those years would have been anti-dilutive.

The Notes to the Consolidated Financial Statements included in Item 8 of this Report contain additional information about charges resulting from other operating expenses and other income (expense) which affects the comparability of information presented.


Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
Overview
This Form 10-KWe operate two segments: RC and APT. Our RC segment is comprised of our equity ownership in Tinuum Group and Tinuum Services, both of which are unconsolidated entities in which we generate substantial earnings. Tinuum Group provides reduction of mercury and NOx emissions at select coal-fired power generators through the production and sale of RC that qualifies for Section 45 tax credits under IRC Section 45. We benefit from Tinuum Group's production and sale of RC, which generates tax credits, as well as its revenue from selling or leasing RC facilities to tax equity investors. We also earn royalties for technologies that we license to Tinuum Group and are used at certain RC facilities to enhance combustion and reduced emissions of NOx and mercury from coal burned to generate electrical power. Tinuum Services operates and maintains the year endedRC facilities under operating and maintenance agreements with Tinuum Group and owners or lessees of the RC facilities. Both Tinuum Group and Tinuum Services expect to significantly wind down their operations by the end of 2021 due to the expected expiration of the Section 45 tax credit period as of December 31, 20172021. As such, our earnings and distributions from our RC segment will substantially cease as of December 31, 2021.
Our APT segment is filed by Advanced Emissionsmaterially operated through a wholly-owned subsidiary, Carbon Solutions, Inc. together with its consolidated subsidiaries (collectively, "ADES,"which we acquired on December 7, 2018 (the "Carbon Solutions Acquisition"). We sell consumable products that utilize AC and chemical based technologies to a broad range of customers, including coal-fired utilities, industrials, water treatment plants, and other diverse markets through the "Company," "we," "us," or "our" unless the context indicates otherwise).
Wecustomer supply agreement defined below. Our primary products are a leader in emissions reductionscomprised of AC, which is produced from lignite coal. Our AC products include PAC and GAC. Our proprietary technologies and associated specialty chemicals, primarily serving the coal-fired power generation and industrial boiler industries. Our proprietary environmental technologies and specialty chemicalsproduct offerings provide purification solutions to enable our customers to reduce emissions of mercurycertain contaminants and other pollutants maximize utilization levels and improve operating efficiencies to meet the challenges of existing and potential emissions control ("EC") regulations. Additionally, through Carbon Solutions, we also own an associated lignite mine that supplies the primary raw material for manufacturing our products.
See further discussion of our business included in Item 1 -"Business" ("Item 1") of this Report. Discussion regarding segment information is included withinin the discussion of our consolidated results under this Item 7. Additionally, discussion related to our reportable segments is included in Item 1 and Note 1319 of the Consolidated Financial Statements, which are included in Item 8 of this Report.
We believe there are opportunities to continue to pursue diverse markets for our purification products outside of coal-fire power generation, including industrial applications and water. The Supply Agreement with Cabot, as discussed below, will help our expansion of our AC products to those diverse end-markets and drive the Company’s post-Refined Coal future.
Drivers of Demand and Key Factors Affecting Profitability
Drivers of demand and key factors affecting our profitability differ by segment. In the RC segment, demand is driven primarily from investors who purchase or lease RC facilities that qualify under the Section 45 tax credit period, which is expected to expire no later than December 31, 2021. Operating results in RC are affected by: (1) the ability to sell, lease or operate RC facilities; (2) lease renegotiation or termination; and (3) changes in tonnage of RC due to changing coal-fired dispatch and electricity power generation sources. Earnings and distributions from our RC segment will substantially cease as of December 31, 2021 as a result the significant wind down of both Tinuum Group and Tinuum Services due to the expected expiration of the Section 45 tax credit period as of December 31, 2021.
In the APT segment, demand is driven primarily by consumables-based solutions for coal-fired power generation and other industrials, municipal water customers, and since September 30, 2020, demand from Cabot's customers through the Supply Agreement discussed below. Operating results in APT has been influenced by: (1) changes in our sales volumes; (2) changes in price and product mix; and (3) changes in coal-fired dispatch and electricity power generation sources.
Customer Supply Agreement
On September 30, 2020, we and Cabot entered into the Supply Agreement pursuant to which we agree to sell and deliver to Cabot, and Cabot agrees to purchase and accept from us, Furnace Products. The term of the Supply Agreement is for 15 years with 10-year renewal terms that are automatic unless either party provides three years prior notice of intention not to renew before the end of any term.
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In addition to the sale by us and purchase by Cabot of Furnace Products, we and Cabot have agreed to additional terms whereby Cabot will reimburse us for certain capital expenditures incurred by us that are necessary to manufacture the Furnace Products. Reimbursements will be in the form of revenues earned from capital expenditures incurred that will benefit both us and Cabot (referred to as "Shared Capital") and capital expenditures incurred that will benefit Cabot exclusively (referred to as "Specific Capital").
We believe the Supply Agreement will provide material incremental volume and capture lower operating cost efficiencies of our manufacturing plant. As these incremental volumes come on-line and after our existing inventory balances are sold, we anticipate an increase in gross margins. Further, we expect the Supply Agreement will expand our activated carbon products to diverse end markets that are outside of coal-fired power generation.
Acquisition of Marshall Mine
Concurrently with the execution of the Supply Agreement, on September 30, 2020, we entered into the Mine Purchase Agreement from Cabot 100% of the membership interests in Marshall Mine, LLC (the "Marshall Mine Acquisition") for a nominal purchase price. Marshall Mine, LLC owns a lignite mine located outside of Marshall, Texas (the "Marshall Mine"). We independently determined to immediately commence activities to shutter the Marshall Mine and will incur the associated reclamation costs.
In conjunction with the execution of the Supply Agreement and the Mine Purchase Agreement, on September 30, 2020, we entered into the Reclamation Contract with a third party that provides a capped cost, subject to certain contingencies, in the amount of approximately $19.7 million plus an obligation to pay certain direct costs of approximately $3.6 million (collectively, the "Reclamation Costs") over the estimated reclamation period of 10 years. We are accounting for this obligation as an asset retirement obligation under U.S. GAAP. Under the terms of the Supply Agreement, Cabot is obligated to reimburse us for $10.2 million of Reclamation Costs (the "Reclamation Reimbursements"), which are payable semi-annually over 13 years and inclusive of interest.
As the owner of the Marshall Mine, we were required to post a surety bond to ensure performance of our reclamation activities in the amount of $30.0 million under the Surety Agreement. For the obligations due under the Reclamation Contract, we were required to post collateral of $5.0 million dollars as of September 30, 2020 and to post an additional $5.0 million dollars as of March 31, 2021.
Settlement with Former Customer
On December 29, 2020, we and a former customer (the "Parties") reached a settlement (the "Settlement") on various litigation matters (the "Litigation Matters") that resulted in the former customer (the "Former Customer") agreeing to pay to us cash of $2.5 million (the "Settlement Amount"), which was received on January 27, 2021. This payment was in exchange for full dissolution of all claims and counterclaims that the two Parties have asserted or could have asserted against each other in the Litigation Matters, or which have arisen or may arise against each other but are presently unknown, arising out of or related to the Litigation Matters and related to any other of the Parties’ business dealings, conduct and/or transactions through the date of the Settlement, including all claims for damages, fees, costs, sanctions, or any other amounts due or to become due in connection with the foregoing. We applied the Settlement Amount cash proceeds to both an outstanding trade account receivable and note receivable due from the Former Customer and recognized the excess cash received as a gain from the Settlement of $1.1 million, which is included as a reduction of operating expenses for the year ended December 31, 2020, See further discussion under "Results of Operations" under this Item 7.
Impact of COVID-19
In March 2020, the WHO declared COVID-19 a global pandemic. We are designated by CISA of the Department of Homeland Security as a critical infrastructure supplier to the energy sector. Our operations have been deemed essential and, therefore, our facilities remain open and our employees employed. We follow the COVID-19 guidelines from the Centers for Disease Control concerning the health and safety of our personnel, including remote working for those that have the ability to do so, sequestered employees at our plant and other heath safety measures. Additionally, we have taken proactive and precautionary steps to ensure the safety of our employees, customers and suppliers, including frequent cleaning and disinfection of workspaces, property, plant and equipment, instituting social distancing measures and mandating remote working environments, where possible, for all employees. These measures have resulted in an increase in our personnel costs, operational inefficiencies and the incurrence of incremental costs to allow manufacturing operations to continue; while at the same time we have faced a general downturn in our sales and marketing efforts.
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The duration of these measures is unknown, may be extended and additional measures may be imposed. We cannot predict the long-term effects on our business, including our financial position or results of operations, if governmental restrictions or other such directives continue for a prolonged period of time and cause a material negative change in power generation demand, materially disrupt our supply chain, substantially increase our operating costs or limit our ability to serve existing customers and seek new customers.
In response to the COVID-19 outbreak, in March 2020, the federal government passed the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act"). The CARES Act provided, among other things, the deferral of payroll tax payments for all payroll taxes incurred through December 31, 2020 and created the Paycheck Protection Program ("PPP"), which is sponsored and administered by the SBA. "). In June 2020, the Paycheck Protection Program Flexibility Act of 2020 (the "PPPFA") was signed into law and established the payment dates in the event that amounts borrowed under the PPP are not forgiven. See further discussion below of the loan made to us under the PPP under the section "PPP Loan" under this Item.
The Company elected to defer payments of payroll taxes for the periods allowed under the CARES Act and will repay 50% by December 31, 2021 and 50% by December 31, 2022. As of December 31, 2020, total payroll tax payments deferred under the CARES Act were $0.4 million.
For the year ended December 31, 2020, we incurred costs of $0.4 million related to sequestration of certain of our employees at our Red River plant. These costs included hazard pay, lodging and meal expenses for 30 days.
Our customers may also be impacted by COVID-19 pandemic as the utilization of energy has changed. We cannot predict the long-term impact on our customers and the subsequent impact on our business.
Components of Revenue, Expenses and Equity Method Investees
The following briefly describes the components of revenues and expenses as presented in the Consolidated StatementStatements of Operations. Descriptions of the revenue recognition policies are included in Note 1 to the Consolidated Financial Statements included in Item 8 of this Report.

Revenues and costscost of revenue

Equipment sales
Equipment sales represent the sale of activated carbon injection ("ACI") systems to control mercury, dry sorbent injection ("DSI") systems to control SO2, SO3, and HCl and electrostatic precipitator ("ESP") liquid flue gas conditioning systems. Revenue from extended equipment contracts is recorded using the completed contract method of accounting.

We also enter into other non-extended equipment contracts for which we generally recognize revenues on a time and material basis as services to build equipment systems are performed or as equipment is delivered.

ChemicalsConsumables
We sell AC and proprietary chemical blends toblend technologies for purification of air and water contaminants and other industries. Currently, our products mostly serve coal-fired utilities and other industrial boilers that allow the respective utilities to comply with the regulatory air emissions standards.standards as well as water treatment plants to remove contaminants from the water. Additionally, we sell AC to Cabot and its customers through the Supply Agreement. Revenue is generally recorded upon delivery of our product.
License royalties, related party
We recognize license royalties under the chemicals.

Certain chemicals customer contractsM-45 License, under our M-45 Technology, to Tinuum Group. License royalties are comprised of evaluation testsbased on a percentage of the Company's chemicals' effectivenessper-ton, pre-tax margin, inclusive of depreciation expense and efficiencyother allocable expenses, as defined in reducing emissionsthe M-45 License. Because Section 45 tax credits from the production and entail the deliverysale of chemicalsRC will likely not be available after 2021 and both Tinuum Group and Tinuum Services expect to the customer and the Company evaluating results of emissions reduction over the term of the contract. The Company generally recognizes revenue from these types of contracts over the duration of the contract based on the cost of chemicals consumedsignificantly wind down their operations by the customer.

Consulting services and other
We provide consulting servicesend of 2021, we do not expect to assist electric power generators and others in planning and implementing strategies to meet the new and increasingly stringent government emission standards requiring reductions in SO2, NOx, particulates, acid gases and mercury.

receive license royalties after 2021.
Other Operating Expenses

Payroll and benefits
Payroll and benefits costs include personnel related fringe benefits, sales and administrative staff labor costs and stock compensation expenses. Payroll and benefits costs exclude direct labor included in Cost of revenue.

Rent and occupancy
Rent and occupancy costs include rent, insurance, and other occupancy-related expenses.

Legal and professional fees
Legal and professional costs include external legal, audit and consulting expenses.


General and administrative
General and administrative costs include director fees and expenses, bad debt expense, research and development expense and other general costs of conducting business.

Research and development costs, net of reimbursements from cost-sharing
Research
28


arrangements, are charged to expense in the period incurred and development expense consists of research relating to continued product development for our ongoing businessare reported in the General and various other projects. Historically, we have entered into reimbursement contracts with the Department of Energy ("DOE") related to certain of our research and development contracts. These contracts were best-effort-basis contracts. We have often included and continued to include industry cost-share partners to offset the costs incurred in excess of funded amounts from the DOE or from our own research and development project budgets. We recognize amounts funded by the DOE and industry partners under research-and-development-cost-sharing arrangements as an offset to our aggregate research and development expenses within the Research and development, netadministrative line item in the Consolidated Statements of Operations included in Item 8 of this Report.Operations.

Depreciation, amortization, depletion and amortizationaccretion
Depreciation and amortization expense consists of depreciation expense related to property, plant and equipment and the amortization of long lived intangibles.

long-lived intangible assets. Depletion and accretion expense consists of depletion expense related to the depletion of mine development costs and the accretion of mine reclamation liabilities.
Other Income (Expense), net

Earnings from equity method investments
Earnings from equity method investments relates torepresent our share of earnings (losses) related to our equity method investments.
Our equity method earnings in Tinuum Group, LLC ("Tinuum Group"), a related party in which weWe own a 42.5% equity interest and a 50% voting interest in Tinuum Group. Our equity method earnings in Tinuum Group are positively impacted when Tinuum Group obtains an investor in a refined coal ("RC")RC facility and receives cash payments under either a lease payments from the lessee,arrangement or purchase payments from the sale,sales arrangement of the RC facility. If Tinuum Group operates a retained RC facility, the Company's equity method earnings will beare negatively impacted as operating retained RC facilities generate operating losses. However, we benefit on an after-tax basis if we are able to utilize tax credits associated with the production and sale of RC from operation of retained RC facilities by Tinuum Group. These benefits, if utilized, will increase our consolidated net income as a result of a reduction in income tax expense. In addition, our equity method earnings in Tinuum Group are negatively impacted due to an annual preferred return to which one of Tinuum Group's equity owners, GSFS, is entitled. Therefore, Tinuum Group's equity earnings available to its common members are equal to Tinuum Group's net income less the preferred return due to GSFS. In February 2018, the unrecovered investment balance associated with the preferred return was repaid in full.

Tinuum Services, LLC ("Tinuum Services"), a related party in which weWe own both a 50% equity and voting interest in Tinuum Services, which operates and maintains RC facilities under operating and maintenance agreements. Tinuum Group or theThe lessee/owner of thean RC facilitiesfacility pays Tinuum Services, subject to certain limitations, the costs of operating and maintaining the RC facilities plus certain fees. Tinuum Services also arranges for the purchase and delivery of certain chemical additives under chemical agency agreements necessary for the production of refined coal.RC. Tinuum Services consolidates certain RC facilities leased or owned by tax equity investors that are deemed to be VIE's.variable interest entities ("VIE's"). All net income (loss) associated with these VIE's is allocated to the noncontrolling equity holders of Tinuum Services and therefore does not impact our equity earnings (loss) from Tinuum Services.

On July 27, 2017, we obtained a 50% membership interest in GWN Manager, LLC ("GWN Manager") in exchange for a capital contribution of $0.1 million. GWN Manager subsequently purchased a 0.2% membership interest in a subsidiary of Tinuum Group, which owns a single RC facility that produces RC that qualifies for Section 45 tax credits. Tinuum Group sold 49.9% of the subsidiary that owns the RC facility to an unrelated third party and retained ownership of the remaining 49.9%. GWN Manager is subject to monthly capital calls based on estimated working capital needs.

Through March 3, 2016, we owned a 24.95% equity interest in RCM6, LLC ("RCM6"), a related party, which owned a single RC facility that was managed by Tinuum Group. The economics to us were consistent with an invested facility discussed above except that we were subject to funding our share of RCM6's operating costs during 2014 and 2015 and through March 3, 2016.

Royalties, related party
We license our M-45TM and M-45-PCTM emission control technologies ("M-45 License") to Tinuum Group and realize royalty income based upon a percentage of the per-ton, pre-tax margin as defined in the M-45 License.

Other income (expense)
The remaining components of other income (expense) include interest income, interest expense and other miscellaneous items. For 2017, miscellaneous items included various items related to litigation accruals and settlement with a third-party service provider. For 2016, miscellaneous items included an adjustment to a litigation loss accrual and change in estimate related to royalty indemnity expense.

We record interest expense due to our share of Tinuum Group's equity method earnings for RC facility leases or sales that are treated as installment sales for tax purposes. IRS Section 453A requires taxpayers using the installment method to pay an interest charge on the portion of the tax liability that was deferred under the installment method. We refer to this as "453A interest."

Results of Operations
For comparison purposes, the following tables set forth our results of operations for the years presented in the Consolidated Financial Statements included in Item 8 of this Report. The year-to-year comparison of financial results is not necessarily indicative of financial results that may be achieved in future years.

Year ended December 31, 20172020 Compared to Year ended December 31, 2016

2019
Total Revenue and Cost of Revenue
A summary of the components of revenues and cost of revenue for the years ended December 31, 20172020 and 20162019 is as follows:
Years Ended December 31,Change
(Amounts in thousands except percentages)
20202019($)(%)
Revenues:
Consumables$48,122 $53,187 $(5,065)(10)%
License royalties, related party13,440 16,899 (3,459)(20)%
Other15 — 15 *
Total revenues$61,577 $70,086 $(8,509)(12)%
Consumables cost of revenue, exclusive of depreciation and amortization$45,176 $49,443 $(4,267)(9)%
Other cost of revenue, exclusive of depreciation and amortization(563)— (563)*
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  Years Ended December 31, Change
(Amounts in thousands except percentages)
 2017 2016 ($) (%)
Revenues:        
Equipment sales $31,401
 $46,949
 $(15,548) (33)%
Chemicals 4,246
 3,025
 1,221
 40 %
Consulting services and other 45
 648
 (603) (93)%
Total revenues 35,692
 50,622
 (14,930) (29)%
Operating expenses:        
Equipment sales cost of revenue, exclusive of depreciation and amortization 28,438
 37,741
 (9,303) (25)%
Chemicals cost of revenue, exclusive of depreciation and amortization 3,434
 1,700
 1,734
 102 %
Consulting services and other cost of revenue, exclusive of depreciation and amortization 13
 376
 (363) (97)%
* Calculation not meaningful

Equipment salesConsumables revenue and Equipment salesconsumables cost of revenue
DuringFor the years ended December 31, 20172020 and 2016, we entered into zero and five long-term (6 months or longer) fixed price contracts to supply ACI systems with aggregate contract values, net of change orders of $0.1 million and $2.9 million, respectively. During the years ended December 31, 2017 and 2016, we completed four and 17 ACI systems, recognizing revenues of $3.4 million and $26.9 million and cost of2019, consumables revenue of $2.4 million and $20.5 million, respectively. We recognized zero and $0.5 million in loss provisions related to ACI system contracts during the years ended December 31, 2017 and 2016, respectively. As of December 31, 2017, all ACI system contracts are complete.

During the years ended December 31, 2017 and 2016, we did not enter into any long term (6 months or longer) fixed price contracts to supply DSI systems and other material handling equipment with contract values including associated change orders of zero and $1.5 million, respectively. During the years ended December 31, 2017 and 2016, we completed five and 11 DSI systems, recognizing revenues of $27.8 million and $15.8 million and cost of revenue of $26.0 million and $14.8 million, respectively. During the year ended December 31, 2017, we recognized zero in loss provisions related to DSI system contracts. During the year ended December 31, 2016, we recorded a reduction of $0.1 million in previously recognized loss provisions included in cost of revenue related to DSI system contracts.

Additionally, in 2016, we executed sales-type lease agreements related to ACI and DSI systems and recognized revenue of $3.4 million and cost of revenue of $1.2 million during the year ended December 31, 2016.

The remaining changes were due to other equipment sales.

As a result of using the completed contract method for revenue recognition on long-term equipment contracts, our revenue and cost of revenue information may not be comparable to the information of our competitors who do not use the completed contract method. For example, due to the long-term revenue recognition period on certain contracts, we may recognize less revenue and related cost of revenue during a particular period, but record significant deferred revenue and deferred project costs. This impacts our outstanding backlog as is discussed in more detail in Item 1 of this Report.

Demand for ACI and DSI system contracts during 2015 and 2016 was driven by coal-fired power plant utilities that need to comply with the Mercury and Air Toxics Standards ("MATS") and the Maximum Achievable Control Technology ("MACT") standards by 2016. Revenues related to ACI and DSI system contracts have historically fluctuated due to changes in the number of contracts entered into as well as the long duration of completing certain contracts, which involve long-lead time requirements for manufacturing, installation and testing of the equipment. As the deadline for these standards has now passed, we do not anticipate entering into long-term fixed price contracts for ACI or DSI systems in the future.

Chemicals and Chemical cost of revenue
During the years ended December 31, 2017 and 2016, revenues increaseddecreased year over year primarily due to an overall increaseless favorable price and product mix of approximately $7.6 million combined. Offsetting these decreases was higher volume resulting in poundsrevenue of our chemicals sold. Gross marginsapproximately $2.6 million. However, for the quarterly period ended December 31, 2020, both volumes and revenue increased both sequentially and compared to the quarterly period ended December 31, 2019, primarily due to the Supply Agreement, which was executed on sales of chemicalsSeptember 30, 2020.
Consumables revenue is affected by electricity demand, driven by seasonal weather and related power generation needs, as well as competitor prices related to alternative power generation sources such as natural gas. According to data provided by the EIA, for the year ended December 31, 2017 were lower than 2016 due to price compression in the EC consumables market and increased field testing of our M-ProveTM ("M-Prove") consumable, which results in significantly lower gross margins2020, power generation from coal-fired power dispatch was down approximately 19.0% compared to recurring sales. Futurethe corresponding period revenues are expected to be negatively impacted byin 2019. Additionally, there was a major customer who is not expected to purchase chemicals going forward, as well as the effectsdecrease in total power generation from all sources of continued price compressionapproximately 4.0% in 2020 compared to historical periods. As we continue to expand our customer base and attempt to increase the volume, size and duration of chemical sale arrangements, we are faced with the challenge of a competitive market with a long lead-to-sale cycle. Increasing future sales of chemicals is our primary focus of the EC business at this time.corresponding period in 2019.

Consulting services and other and Consulting servicesConsumables cost of revenue
We reported minimal revenue related to consulting services was positively impacted for the year ended December 31, 2017. Due2020 due to diminishinghigher volumes driving lower per unit fixed costs. However, we incurred additional expense from safety actions taken by the Company to provide for continued operation of our manufacturing facilities in response to COVID-19 of approximately $0.4 million. For the year ended December 31, 2019, consumables cost of revenue was negatively impacted as a result of $5.0 million of costs recognized as a result of the step-up in inventory fair value recorded from the Carbon Solutions Acquisition.
For 2021, based on current market demandestimates and the expected benefits from the Supply Agreement, we believe that consumables revenue and volumes will be higher for 2021 compared to 2020. In addition to the Supply Agreement, the most significant drivers related to historical services provided,this expected volume increase are expected higher natural gas prices and the expansion of energy generation sources related to natural gas and renewables. For 2021, we doexpect to incur additional plant costs that were not believe this revenue component will be materialincurred in 2020 for the planned plant turnaround occurring in 2021.
License royalties, related party
License royalties decreased in 2020 compared to 2019 primarily due to a reduction in the near term.royalty rate per ton. This decrease was primarily attributable to higher depreciation recognized of approximately $1.7 million on all royalty bearing RC facilities as a result of a reduction in their estimated useful lives as determined by Tinuum Group in the second half of 2019. Further reducing the rate per ton was a decrease in net lease payments of approximately $1.3 million as a result of Tinuum Group restructuring RC facility contracted leases with its largest customer in the second half of 2019. As a result of higher depreciation and lower lease payments, we expect that the lower royalty rate per ton will continue in 2021.
Offsetting the year over year decrease in license royalties from a decrease in the royalty rate per ton, there was an increase year over year in tons of RC produced from RC produced using the M-45 Technology under the M-45 License, which increased from 47.3 million tons in 2019 to 49.4 million tons in 2020.
Other cost of revenue
For the year ended December 31, 2020, we recognized a credit of $0.6 million to Other cost of revenue for the reversal of an allowance, originally recorded as of December 31, 2016, on a trade account receivable due from the Former Customer. We also provide consulting services related to emissions regulations.recorded the reversal of this reserve based on our quarterly collectability review of financial assets that was performed as of December 31, 2020. See further discussion below of the reversal of an allowance on a note receivable due from the Former Customer in this section under the caption "General and administrative."
Additional information related to revenue concentrations and contributions by class and reportable segment can be found withinis included in the segment discussion below"Business Segments" section of this Item and in Note 1413 and Note 19 to the Consolidated Financial Statements included in Item 8 of this Report.


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Other Operating Expenses
A summary of the components of our operating expenses, exclusive of cost of revenue items (presented above), for the years ended December 31, 20172020 and 20162019 is as follows:
Years Ended December 31,Change
(in thousands, except percentages)20202019($)(%)
Operating expenses:
Payroll and benefits$10,621 $10,094 $527 %
Legal and professional fees5,585 9,948 (4,363)(44)%
General and administrative8,228 8,123 105 %
Depreciation, amortization, depletion and accretion8,537 7,371 1,166 16 %
Impairment of long-lived assets26,103 — 26,103 *
Gain on settlement(1,129)— (1,129)*
$57,945 $35,536 $22,409 63 %
  Years Ended December 31, Change
(in thousands, except percentages) 2017 2016 ($) (%)
Operating expenses:        
Payroll and benefits $7,669
 $12,390
 $(4,721) (38)%
Rent and occupancy 795
 2,168
 (1,373) (63)%
Legal and professional fees 4,354
 8,293
 (3,939) (47)%
General and administrative 3,857
 3,721
 136
 4 %
Research and development, net 157
 (648) 805
 (124)%
Depreciation and amortization 789
 979
 (190) (19)%
  $17,621
 $26,903
 $(9,282) (35)%
* Calculation not meaningful

Payroll and benefits
Payroll and benefits expenses decreased in 2017 compared to 2016increased year over year primarily due to severance related costs of $1.4 million incurred in 2020 associated with the resignation of an executive officer, offset by a decrease in averagesalaries related to our current headcount, which remained relatively consistent year over year.
Legal and professional fees
Legal and professional fees decreased year over year primarily due to decreased outsourced shared service costs, which included legal, general consulting and audit and accounting fees of approximately 40% during 2017. Additionally, restructuring$2.8 million, and a reduction in outsourced IT costs specific to the completion of the integration of Carbon Solutions of $1.5 million.
General and administrative
General and administrative expenses decreased duringincreased year over year primarily due to an increase in product development expenses of approximately $0.8 million related to the Supply Agreement, an increase in rent and occupancy of approximately $0.6 million relating to property taxes and office rent, and an increase in costs incurred due to the sequestration of certain of our employees at our Red River plant of approximately $0.4 million.
Offsetting these increases was the reversal of an allowance on a note receivable from the Former Customer (See "Other cost of revenue" discussion of above under this section) of $0.4 million, which we reversed as part of our financial asset collectability review performed as of December 31, 2020. See further discussion below in this section under the caption "Gain on settlement." Further reductions year over year included travel, as a preventative measure related to the COVID-19 pandemic, and recruiting fees.
Depreciation, amortization, depletion and accretion
Depreciation and amortization expense increased year over year primarily due to increased sales volumes in 2020 and lower absorption due to the drawdown of inventory, resulting in an increase of depreciation expense of $1.1 million. Further, the addition of leasehold improvements at our corporate headquarters in 2020 and the addition of accretion expense related to Marshall Mine contributed approximately $0.7 million of depreciation and amortization expense in 2020. Offsetting these increases was a decrease year over year in depreciation and amortization expense of approximately $0.6 million related to impaired property, plant and equipment assets as of June 30, 2020, which resulted in lower net book values of the impaired assets of June 30, 2020 and lower depreciation and amortization recorded in the second half of 2020.
Impairment of long-lived assets
As of June 30, 2020, we recorded an impairment charge of $26.1 million, which is included in the Statement of Operations for the year ended December 31, 2017 compared2020 and was solely attributable to 2016 in connection with the departure of certain executive officers and management's alignmentour APT segment. This impairment charge was necessitated by an analysis of the business with strategic objectives in 2016. During the years ended December 31, 2017 and December 31, 2016, we recorded net restructuring charges of zero and $1.6 million, respectively. In addition, bonuses and stock-based compensation decreased by $1.4 million in 2017 compared to 2016.


Rent and occupancy
Rent and occupancy expenses decreased in 2017 compared to 2016 primarily due to lower rent and occupancy expense in 2017 as a result of the relocationcarrying values of our corporate headquarters in the first quarter of 2017APT segment's long-lived assets and the acceleration of deferred rent and tenant improvement allowances recorded in 2017 associated with the termination of the lease agreementcertain other long-lived assets (the "Asset
31


Group"), which are comprised of our former corporate headquarters.manufacturing plant and related assets and our lignite mine assets, to their respective fair values.

Gain on settlement
Legal and professional fees
Legal and professional fees expenses decreased in 2017 compared to 2016 as a result of a reduction in the professional resources deployed to address the restatement of our consolidated financial statements, including litigation associated with such restatement. Expenses related to the restatement duringAs noted above under this Item 7, for the year ended December 31, 2017 and 2016 were zero and $2.0 million, respectively. Additional decreases during the year ended December 31, 2017 were driven by a decrease in costs related to outsourced shared service costs, including accounting consultants, legal fees and audit fees.

General and administrative
General and administrative expenses remained relatively flat in 2017 compared to 2016 as we began to experience normalization of our operating expenses in most categories following our cost-containment initiatives implemented in 2016. During the year ended December 31, 2017, we incurred expenses related to the implementation of a new enterprise resource planning ("ERP") system and a $0.4 million reserve on an asset related to a letter of credit asset draw made by a former customer that we are contesting and pursing legal actions. These increases were offset by decreases in travel and professional expenses. During the year ended December 31, 2016,2020, we recognized impairment chargesa gain of $1.1 million on property and equipment and inventory of $0.5 million, as projected future cash flows from operations related to such property and equipment and inventory did not support the carrying value of these assets.

Research and development, net
Research and development expense increased in 2017 compared to 2016 primarily due toSettlement with the reimbursements of research and development expense recognized in 2016 from final billings to the DOE on one research and development contract, which resulted in negative research and development expense for 2016, and an increase in research and development activities during 2017 incurred in pursuit of the expansion of potential product offerings within the emissions reduction consumables market to complement our existing chemicals solutions. The net increase in 2017 was offset by a decrease in our asset retirement obligation estimate, which was primarily driven by a reduction in the scope of the obligation.

Depreciation and amortization
Depreciation and amortization expense decreased in 2017 compared to 2016 primarily due to higher depreciation recorded in 2016 as a result of the acceleration of depreciation on certain fixed assets that were disposed of in 2016 in connection with our corporate office relocation, which resulted in a lower depreciable base in 2017. Additionally, during 2016, we terminated a technology license arrangement, which resulted in approximately $0.1 million decrease in the related amortization expense. in 2017.

Former Customer.
Other Income (Expense), net
A summary of the components of our other income (expense), net for the years ended December 31, 20172020 and 20162019 is as follows:
 Years Ended December 31, ChangeYears Ended December 31,Change
(Amounts in thousands, except percentages) 2017 2016 ($) (%)(Amounts in thousands, except percentages)20202019($)(%)
Other income (expense):        Other income (expense):
Earnings from equity method investments $53,843
 $45,584
 $8,259
 18 %Earnings from equity method investments$30,978 $69,176 $(38,198)(55)%
Royalties, related party 9,672
 6,125
 3,547
 58 %
Interest income 54
 268
 (214) (80)%
Interest expense (3,024) (5,066) 2,042
 (40)%Interest expense(3,920)(7,174)3,254 (45)%
Litigation settlement and royalty indemnity expense, net 3,269
 3,464
 (195) (6)%
Other 2,025
 2,463
 (438) (18)%Other132 427 (295)(69)%
Total other income $65,839
 $52,838
 $13,001
 25 %Total other income$27,190 $62,429 $(35,239)(56)%
Earnings infrom equity method investments
The following table presents the equity method earnings by investee for the years ended December 31, 20172020 and 2016:2019:
Years Ended December 31,Change
(in thousands)20202019($)(%)
Earnings from Tinuum Group$24,396 $60,286 $(35,890)(60)%
Earnings from Tinuum Services6,582 8,896 (2,314)(26)%
Earnings (loss) from other— (6)(100)%
Earnings from equity method investments$30,978 $69,176 $(38,198)(55)%
  Years Ended December 31, Change
(in thousands) 2017 2016 ($) (%)
Earnings from Tinuum Group $48,875
 $41,650
 $7,225
 17 %
Earnings from Tinuum Services 4,963
 4,491
 472
 11 %
Earnings (losses) from other 5
 (557) 562
 (101)%
Earnings from equity method investments $53,843
 $45,584
 $8,259
 18 %


Earnings from equity method investments, and changes related thereto, are impacted by our most significant equity method investees: Tinuum Group and Tinuum Services. Earnings from equity method investments increased duringFor the year ended December 31, 2017 compared to 2016 primarily as a result of an increase2020, we recognized $24.4 million in cash distributions due to the addition of four invested facilities, three of which were fully invested by third parties during 2017. See the discussion below regarding the accounting ofequity earnings from Tinuum Group.

DuringGroup, which was equal to our proportionate share of Tinuum Group's net income for the year. For the year ended December 31, 2017,2019, we recognized $48.9$60.3 million in equity earnings from Tinuum Group compared to our proportionate share of Tinuum Group's net income of $46.6$62.0 million for the year. DuringThis difference was the year ended December 31, 2016, we recognized $41.7 million in equity earningsresult of cumulative distributions received from Tinuum Group compared to our proportionate share of Tinuum Group's net income of $35.0 million for the year. The difference between our pro-rata share of Tinuum Group's net income and our earnings from our Tinuum Group equity method investment as reported on the Condensed Consolidated Statements of Operations relates to us receiving cumulative distributionsbeing in excess of the carrying value of the investment, and therefore recognizingwe recognized such excess distributions as equity method earnings in the periodyear the distributions occur, as discussed in more detail below.
As a resultoccurred. See further discussion of cash flows from invested RC facilities, Tinuum Group distributions to us during the year ended December 31, 2017 were $48.9 million, which exceeded our pro-rata share of Tinuum Group's net income, resulting in us having cumulative cash distributions that exceeded our cumulative pro-rata share of Tinuum Group's net income as of December 31, 2017.
The following table for Tinuum Group presents our investment balance, equity earnings, cash distributions received and cash distributions in excess of the investment balance for the years ended December 31, 2017 and 2016 (in thousands).
Description Date(s) Investment balance ADES equity earnings (loss) Cash distributions Memorandum Account: Cash distributions and equity loss in (excess) of investment balance
Total investment balance, equity earnings (loss) and cash distributions 12/31/2015 $
 $
 $
 $(3,263)
ADES proportionate share of net income from Tinuum Group (1)
 2016 activity 35,019
 35,019
 
 
Recovery of cash distributions in excess of investment balance (prior to cash distributions) 2016 activity (3,263) (3,263) 
 3,263
Cash distributions from Tinuum Group 2016 activity (41,650) 
 41,650
 
Adjustment for current year cash distributions in excess of investment balance 2016 activity 9,894
 9,894
 
 (9,894)
Total investment balance, equity earnings (loss) and cash distributions 12/31/2016 
 41,650
 41,650
 (9,894)
ADES proportionate share of net income from Tinuum Group (1)
 2017 activity 46,551
 46,551
 
 
Recovery of cash distributions in excess of investment balance (prior to cash distributions) 2017 activity (9,894) (9,894) 
 9,894
Cash distributions from Tinuum Group 2017 activity (48,875) 
 48,875
 
Adjustment for current year cash distributions in excess of investment balance 2017 activity 12,218
 12,218
 
 (12,218)
Total investment balance, equity earnings and cash distributions 12/31/2017 $
 $48,875
 $48,875
 $(12,218)

(1) The amounts of our 42.5% proportionate share of net income as shown in the table above differ from mathematical calculations of the Company’s 42.5% equity interest in Tinuum Group multiplied by the amounts of Net Income available to Class A members as shown in the table above of Tinuum Group results of operations due to adjustments related to the Class B preferred return and the elimination of Tinuum Group's earnings attributable to RCM6, of which we owned 24.95%, for the period from January 1 to March 3, 2016.
Tinuum Group's consolidated financial statements as of December 31, 2017 and 2016, and for the years ended December 31, 2017, 2016 and 2015 are included in Item 15 of this Report.
Equity earnings from our interest in Tinuum Services increased by $0.5 million in 2017 compared to 2016. As of December 31, 2017 and 2016, Tinuum Services provided operating and maintenance services to 16 and 13 RC facilities, respectively. However, the weighted-average number of RC facilities for which Tinuum Services provided operating and maintenance services, based upon the number of months each facility was operated during the respective years, did not change year over year. Tinuum Services derives earningsyear changes in Earnings from both fixed-fee arrangements as well as fees that are tied to actual RC production, depending upon the specific RC facility operating and maintenance agreement.
On March 3, 2016, we sold our 24.95% membership interestEquity Investments in RCM6 for a cash payment of $1.8 million and assumption of a note payable (the "RCM6 Note Payable") made by us in connection with our purchase of the RCM6 membership interest from Tinuum Group in February 2014. Through March 3, 2016, we recognized equity losses related to our investment in RCM6 of $0.6 million.
On July 27, 2017, we obtained a 50% membership interest in GWN Manager in exchange for a capital contribution of $0.1 million. GWN Manager subsequently purchased a 0.2% membership interest in a subsidiary of Tinuum Group, which owns a single RC facility that produces RC that qualifies for Section 45 tax credits. Tinuum Group sold 49.9% of the subsidiary that owns the RC facility to an unrelated third party and retained ownership of the remaining 49.9%. We are subject to monthly capital calls to GWN Manager based on estimated working capital needs. Our investment in GWN Manager as of December 31, 2017, was $0.1 million. Equity earnings from our interest in GWN Manager included our share of net income from inception to December 31, 2017.
"Business Segments" under this Item. Additional information related to equity method investments can be foundis included in Note 27 to the Consolidated Financial Statements included in Item 8 of this Report.

Tinuum Group's audited consolidated financial statements as of December 31, 2020 and 2019 and for the years then ended are included in Item 15 - "Exhibits and Financial Statement Schedules" ("Item 15") of this Report.
Tax Credits and Obligations
WeHistorically, we have earned the followingSection 45 tax credits that may be available for future benefit related to the production of RC from the operation of retained RC facilities under the Internal Revenue Code ("IRC") Section 45 - Production Tax Credit ("Section 45 tax credits"):
  Years Ended December 31,
(in thousands) 2017 2016
Section 45 tax credits earned $3,496
 $2,956
The increase in thewhich we have held both direct ownership and indirect ownership through Tinuum's direct ownership. We refer to these RC facilities as "retained facilities." Future earned Section 45 tax credits earned during the year ended December 31, 2017 comparedfor 2021 are expected to December 31, 2016 was collectively due to our membership interest in GWN Manager and Tinuum Group's ownership in the single RC facility that is generating tax credits.
As discussed in Item 1 of this Report, Tinuum Group operates and leases or sells facilities used in the production and sale of RC to third party tax equity investors. All dispositions of such facilities are treated as sales for federal income tax purposes at Tinuum Group. The resulting gain from these sales is reported by Tinuum Group pursuant to the installment method under IRC Section 453. Under IRC Section 453A ("453A"), taxpayers using the installment method for income tax purposes are required to pay interest ("453A interest") calculated on the portion of the tax liability that is deferred under the installment method.be consistent with 2020. As of December 31, 2017, ADES’s allocable share of the gross deferred installment gain from Tinuum Group to be recognized in future years was approximately $202 million.
Due to the production and sale of RC from the operation of retained RC facilities, Tinuum Group has generated production tax credits ("PTCs") that qualify as General Business Credits ("GBCs"). These GBC's are allocated to the owners of Tinuum Group, including us, who may benefit to the extent that the GBC's are realized from the operation of retained RC facilities. As of December 31, 2017,2020, we had approximately $100.2$93.9 million in GBCSection 45 tax carryforwards.
In the hypothetical event of an ownership change, as defined by IRC Section 382, utilization of the GBC'sgeneral business credits ("GBC's") generated prior to the change would be subject to an annual limitation imposed by IRC Section 383 for GBC's. The results of a recent analysis indicated that we had not experienced an ownership change as of December 31, 2017,2020, as defined by IRC Section 382. Such analysis for the period from January 1, 20182021 through the date of this Report has not been completed.
32


Therefore, it is possible that we experienced an ownership change between January 1, 20182021 and the date of this filing, thus subjecting our GBC

carryforwards to limitation. Should
Interest expense
Interest expense decreased year over year by $3.3 million primarily due to a limitation exist, however, we would likely bereduction in a position to substantially increase the limitation amount by virtuecoupon interest of our approximately $202$2.4 million deferred installment sale gain at Tinuum Group.
Specifically, IRC Section 382 provides that a corporation with a net unrealized built-in gain ("NUBIG") immediately before an ownership change may increase its limitation by the amount of recognized built-in gain ("RBIG") arising from the sale of a built-in gain asset during a recognition period, which is generally the five-year period immediately following an ownership change. Built-in gain reported on the installment sale method that is attributable to assets sold by the corporation before or during the recognition period may increase the corporation’s limitation during and after the recognition period. Therefore, it is likely that any IRC Section 382 limitation imposed upon an ownership change may be increased by our share of RBIG from Tinuum Group’s installment sale gain attributable to RC facilities sold before or during the period in which the change in ownership occurred.
There are numerous assumptions that must be considered in calculating the RBIG related to Tinuum Groupsenior term loan (the "Senior Term Loan"), as the principal balance was reduced from payments made of $24.0 million in 2020 and the increaseweighted-average interest rate for 2019 compared to our IRC Section 383 limitation. Assuming2020 decreased from 7.1% to 5.8%. Interest expense related to debt discount and debt issuance costs related to the following assumptions below, we may be able to increase the total limitationSenior Term Loan also decreased by approximately $202$0.3 million over the duration of the installment sale. As of December 31, 2017, after increasing the total hypothetical limitation, we would likely not have been able to utilize approximately $41.0 million of tax credits.
The Tinuum Group RBIG isas a result of the sale of RC facilities by Tinuum Group and its election to utilize the installment sale method for tax purposes;
Investors in RC facilities will not terminate existing contracts as completion of an installment sale transaction is necessary to realize RBIG;
We have no net unrealized built-in loss to offset the NUBIG from Tinuum Group;
Our RBIG is equal to the deferred gain allocated from Tinuum Group or, approximately $202 million;
We will have a NUBIG immediately before a hypothetical ownership change such that the Tinuum Group RBIG is available to increase the IRC Section 382 limitation;
We will continue our historic business operations for at least two years following a hypothetical ownership change; and
A second ownership change does not occur.
The annual limitation will be increased by the amount of RBIG that is included in taxable income each year. 
Royalties, related party
Royalty income increased in 2017 compared to 2016 primarily due to obtaining additional tax equity investors for four incremental new facilities during 2017 compared to 2016, all of which use our M-45 License. The total facilities that use our M-45 License increased from six facilities in 2016 to 10 facilities in 2017. The increase in facilities resulted in an increase in rental and sales payments to Tinuum Group and an increasedecrease in the related tons produced and sold subject to the M-45 License. During the years ended December 31, 2017 and 2016, there were 22.6 million tons and 16.2 million tons, respectively, of RC produced using the M-45 License.

Interest expense
Interest expense decreased in 2017 compared to 2016 primarily due to interest expense incurred in 2016 related to a credit agreement for a $15.0 million short-term loan with a related party (the "Credit Agreement"), which was terminated in June 2016 and resulted in aSenior Term Loan principal. The remaining decrease of $2.1 million. In addition, interest expense decreased in 2017 compared to 2016 by $0.3 million related to the RCM6 Note Payable, which was eliminated in March 2016.

Offsetting these decreases in interest expense was an increase of $0.1 millionyear over year related to lower interest expense ("Section 453A interest") in 2020 compared to 2019 related to IRS section 453A ("Section 453A"), which was primarily due to an increasedecreased by $0.7 million in 20172020 year over year as a result of a decrease in the aggregate deferred tax liability which was primarily driven by an increase in investedfor the year ended December 31, 2020 associated with RC facilities in which Tinuum Group recognized as installment sales for tax purposes from 13 as of December 31, 2016 to 17 as of December 31, 2017.

purposes.
The following table shows the balance of the tax liability that has been deferred and the applicable interest rate used to calculate 453A interest:
As of December 31,
(in thousands)20202019
Tax liability deferred on installment sales (1)
$10,653 $20,783 
Interest rate3.00 %5.00 %
  As of December 31,
(in thousands) 2017 2016
Tax liability deferred on installment sales (1)
 $70,739
 $71,559
Interest rate 4.00% 4.00%
(1) Represents the approximate tax effected liability utilizing the federal tax rate in effect for the applicable years ended related to the deferred gain on installment sales (approximately $202$59.8 million as of December 31, 2017)2020).


BasedWe expect the tax liability deferred on the interest rate in effect as of the date of this filing, the 453A interest rate for the year ended December 31, 2018 is expectedinstallment sales to be 5%.

Revision of estimated litigation settlement and royalty indemnity expense, net
During the years ended December 31, 2017 and 2016, management revised its estimate for future Royalty Award (as defined in Note 4 to the Consolidated Financial Statements included in Item 8 of this Report) payments based in part on updated forecasts provided to us by ADA Carbon Solutions, LLC ("Carbon Solutions"). As discussed in Note 4 to the Consolidated Financial Statements, we were required to pay additional damages related to certain future revenues generated from Carbon Solutions. These forecasts provided in 2017 and 2016 included a material reduction in estimated future revenues generated at the specific activated carbon plant from which the royalties are generated.

In December 2017, we, Carbon Solutions and the parent company of Carbon Solutions agreed to terminate certain provisions of the Indemnity Settlement Agreement (the " Indemnity Termination Agreement"). Pursuant to an agreement executed concurrently with the Indemnity Termination Agreement, the Company, Norit and an affiliate of Norit (collectively referred to as “Norit”) agreed to a final payment in the amount of $3.3 million (the "Settlement Payment") to settle all outstanding royalty obligations owed under the terms of the Norit Settlement Agreement. This amount was paid by the Company on December 29, 2017. As a result of changes in estimates and the final Settlement Payment, the Litigation settlement and royalty indemnity expense, net line item was positively impacted by $3.3 million and $3.5 million during the years ended December 31, 2017 and 2016, respectively.

Other
The components of Other income (expense) include the following significant items:

Settlement with service provider
In November 2017, we entered into a settlement agreement with a former third-party service provider and as part of the settlement we received cash in the amount of $3.5 million. Cash from this settlement was received in December 2017.

Advanced Emission Solutions, Inc. Profit Sharing Retirement Plan
The Advanced Emissions Solutions, Inc. Profit Sharing Retirement Plan (the “401(k) Plan”) is subject to the jurisdiction of the Internal Revenue Service ("IRS") and the Department of Labor ("DOL"). The DOL opened an investigation into the 401(k) Plan, and we are responding to all requests for documents and information from the DOL. The DOL has not issued any formal findings as of the date of this Report. Although we believe there has been no breach of fiduciary duty with respect to the 401(k) Plan, we believe a liability for contributions to the 401(k) Plan is probable and estimable and, as such, should be accrued for in the amount of $1.0 millionminimal as of December 31, 2017. The liability is recorded in the Other current liabilities line item on the Consolidated Balance Sheets. The expense recognized related to this accrual is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2017.2021.

Impairment of cost method investment
In November 2014, we acquired an 8% ownership interest in the common stock of Highview ("Highview"), a London, England based development stage company specializing in power storage. We accounted for our investment in Highview (the "Highview Investment") under the cost method. As of September 30, 2017, we recorded an impairment charge of $0.5 million for the Highview Investment based on an estimated fair value of £1.00 compared to the estimated carrying value prior to the impairment charge of £2.00 per share. As of December 31, 2017, the estimated fair value of the Highview Investment was based on an equity raise that commenced during the third quarter of 2017 at a price of £1.00 per share. The impairment charge is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2017.

As of December 31, 2016, we recorded an impairment charge of $1.8 million for the Highview Investment based on an estimated fair value of £2.00 per share compared to the estimated carrying value prior to the impairment charge of £4.25 per share. The impairment charge is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.

Gain on sale of equity method investment
On March 3, 2016, we sold our 24.95% membership interest in RCM6 for a cash payment of $1.8 million and the assumption, by the buyer, of the RCM6 Note Payable. The outstanding balance on the RCM6 Note Payable at the time of the sale was $13.2 million. With the sale of our membership interest in RCM6, we recognized a gain on the sale of $2.1 million, which is included within the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.


Gain on settlement of note payable
During the first quarter of 2016, we entered into an agreement to settle the remaining amounts owed to the former owner of the DSI equipment assets that we acquired in 2014 (the "DSI Business Owner"), resulting in a gain of approximately $0.9 million, which is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.

Gain on settlement of licensed technology obligation
On June 15, 2016, we entered into an agreement with Highview to terminate a license agreement (the "Highview License") in exchange for a one-time payment by us of £0.2 million (approximately $0.2 million). According to the agreement, this payment will only be made upon the sale of our shares in Highview to satisfy the liability. As a result of terminating the Highview License, we eliminated the licensed technology asset, reduced the corresponding long-term liability to the amount of the one-time payment, and recognized a gain of approximately $0.2 million, which is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.

Gain on lease termination
On September 30, 2016, we and the lessee terminated a sale-type lease, and we recorded a lease termination fee of $3.6 million, which was in excess of the carrying value of the net investment in sales-type lease of $2.7 million. As a result of this lease termination, we recognized a gain of $0.9 million, which is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.

Income tax expense (benefit)
New Tax Legislation
On December 22, 2017 (the "Enactment Date"), the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). The Tax Act makes broad and complex changes to the U.S. tax code and key provisions applicable, or that may be applicable, to us or certain of Tinuum Group's existing or potential customers for 2018 include the following: (1) reduction of the U.S. federal corporate tax rate from 35 percent to 21 percent; (2) elimination of the corporate alternative minimum tax (AMT); (3) a new limitation on deductible interest expense; (4) limitations on the deductibility of certain executive compensation; (5) limitations on the use of foreign tax credits ("FTCs") to reduce the U.S. income tax liability; (6) limitations on net operating losses (“NOL’s”) generated after December 31, 2017 to 80 percent of taxable income; and (7) the introduction of the Base Erosion Anti-Abuse Tax (“BEAT”) for tax years beginning after December 31, 2017.

Concurrent with the enactment of the Tax Act, in December 2017, the SEC staff issued Staff Accounting Bulletin 118 ("SAB 118"), which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Enactment Date for companies to complete the accounting under Accounting Standards Codification 740 - Income Taxes ("ASC 740"). In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 is complete. To the extent that an entity's accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act.

Our assessment and accounting for the income tax effects of the Tax Act affecting our consolidated financial statements is generally complete, subject to continued evaluation under SAB 118, and as such, we recorded an adjustment to our recorded deferred tax assets and deferred tax liabilities as of the Enactment Date from 35 percent to 21 percent. Accordingly, we have recorded a reduction of $5.8 million to our net deferred tax assets as of December 22, 2017 with a corresponding entry to deferred tax expense for the year ended December 31, 2017 for those temporary differences expected to reverse after the Enactment Date. This adjustment is reflected in our income tax expense for the year ended December 31, 2017 and was the primary factor that increased our effective income tax rate to 46% for 2017. We do not anticipate any other accounting impacts of the Tax Act during the period within one year from the Enactment Date, however, we will continue to assess any potential impact from the Tax Act through this period.

Beginning January 1, 2018, our effective income tax rate for 2018 and future years will be substantially lower as a result of the lowering of the U.S. federal corporate tax rate to 21%, however, this decrease in tax rate may also result in decreased utilization of deferred tax assets prior to their expiration.
For the year ended December 31, 2017, we recorded2020, our reported income tax expense of $24.2$6.5 million compared to andiffered from federal income tax benefit of $60.9$2.9 million, for 2016. Thecomputed by applying the U.S. statutory federal income tax expense forrate (the "Federal Rate") and state income tax benefit of $0.4 million, primarily due to the increase in the valuation allowance on our deferred income tax assets of $9.1 million.
For the year ended December 31, 2017 includes $5.8 million associated with the reduction of2019, our net deferred tax asset as of the Enactment Date of the Tax Act. Excluding the impact of the Tax Act,

we would have recorded a tax benefit of approximately $14.0 million during the fourth quarter of 2017 due to a reduction in the valuation allowance recorded against our deferred tax assets. However, after the impact of the Tax Act, we recordedreported income tax expense of $11.5 million. The$12.0 million differed from income tax expense of $10.0 million, computed using the Federal Rate, primarily due to an increase in income tax expense from state income tax expense, net of federal benefit for 2016 primarily reflects a $61.4 million reversal of the valuation allowance of our deferred tax assets. As of December 31, 2017 and 2016, we had a valuation allowance recorded of $75.4 million and $75.9 million, respectively, against our deferred tax assets.$1.6 million.
Accounting for income taxes requires that companies assess whether a valuation allowance should be recorded against their deferred tax asset based on an assessment of the amount of the deferred tax asset that is “more likely than not” to be realized. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount that is more likely than not to be realized. 
We assess the valuation allowance recorded against deferred tax assets at each reporting date. The determination of whether a valuation allowance for deferred tax assets is appropriate requires the evaluation of positive and negative evidence that can be objectively verified. Consideration must be given to all sources of taxable income available to realize the deferred tax asset, including, as applicable, the future reversal of existing temporary differences, future taxable income forecasts exclusive of the reversal of temporary differences and carryforwards, taxable income in carryback years and tax planning strategies. In estimating taxes, we assess the relative merits and risks of the appropriate tax treatment of transactions taking into account statutory, judicial, and regulatory guidance.
As of December 31, 2017,2020, we concluded it is more likely than not we will generate sufficient taxable income within the applicable NOLnet operating loss and tax credit carry-forwardcarryforward periods to realize $38.7$10.6 million of our net deferred tax assets, and therefore, reversed $0.5 million of the valuation allowance.assets. In reaching this conclusion, we most significantlyprimarily considered: (1) forecaststhe future reversal of continued future taxable income,existing temporary differences; and (2) changes to the current deferred tax asset ("DTA") balances related to the effects of the Tax Act, (3) changes to forecasts of future utilizationtaxable income. As of DTA's related to the effects of the Tax Act,December 31, 2020 and (4) impacts of additional RC invested facilities during 2017.
Prior to 2016,2019, we had recorded a valuation allowance for all of $88.8 million and $79.6 million, respectively, on our deferred tax assets, primarily due to our historical three-year cumulative loss position. However, as of December 31, 2016, we concluded it was more likely than not that we would generate sufficient taxable income within the applicable NOL and tax credit carry-forward periods to realize $61.4 of our net deferred tax assets, and therefore, reversed $61.4 million of the valuation allowance, after utilizing $11.0 million during 2016. This conclusion was reached after weighing all of the evidence and determining that the positive evidence outweighed the negative evidence. The positive evidence considered by management in arriving at its conclusion to partially reverse the valuation allowance includes factors such as: (1) emergence from the previous three-year cumulative loss position during the fourth quarter of 2016, (2) completion of four consecutive quarters of profitability and (3) forecasts of continued future profitability.assets.
The ability to recognize the remaining deferred tax assets that continue to be subject to a valuation allowance is evaluated on a quarterly basis to determine if there are any significant events that would affect the ability to utilize those deferred tax assets.
33


Our estimate of future taxable income is based on internal projections whichthat consider historical performance, multiple internal scenariosassumptions on future performance and assumptions, as well as external data that we believe is reasonable.data. If events are identified that affect our ability to utilize our deferred tax assets, or if additional deferred tax assets are generated, thewe update our analysis will be updated to determine if any adjustmentsan increase to the valuation allowance areis required. If actual results differ negatively from the current estimates of future taxable income, even if caused by adverse macro-economic conditions, the remaining valuation allowance may need to be increased. Such an increase could have a material adverse effect on our financial condition and results of operations. Conversely, better than expected results and continued positive results and trends could result in further releasesan decrease to the deferred tax valuation allowance, and any such decreases could have a material positive effect on our financial condition and results of operations.
See additional discussion in Note 1218 of the Consolidated Financial Statements included in Item 8 of this Report.

Year ended December 31, 2016 Compared to Year ended December 31, 2015

Total Revenue and Cost of Revenue
A summary of the components of revenues and costs of revenue for the years ended December 31, 2016 and 2015 is as follows:
34
  Years Ended December 31, Change
(in thousands except percentages)
 2016 2015 ($) (%)
Revenues:        
Equipment sales $46,949
 $60,099
 $(13,150) (22)%
Chemicals 3,025
 888
 2,137
 241 %
Consulting services and other 648
 1,752
 (1,104) (63)%
Total revenues 50,622
 62,739
 (12,117) (19)%
Operating expenses:        
Equipment sales cost of revenue, exclusive of depreciation and amortization 37,741
 45,433
 (7,692) (17)%
Chemicals cost of revenue, exclusive of depreciation and amortization 1,700
 601
 1,099
 183 %
Consulting services and other cost of revenue, exclusive of depreciation and amortization 376
 1,518
 (1,142) (75)%



Non-GAAP Financial Measures
Equipment salesTo supplement our financial information presented in accordance with GAAP, we are providing non-GAAP measures of certain financial performance. These non-GAAP measures include Consolidated EBITDA, Consolidated Adjusted EBITDA, RC Segment EBITDA, RC Segment Adjusted EBITDA, APT Segment EBITDA and Equipment sales cost of revenue
During the years ended December 31, 2016 and 2015, we entered into five and four long-term (six months or longer) fixed price contractsAPT Segment Adjusted EBITDA. We have included non-GAAP measures because management believes that they help to supply ACI systems with aggregate contract values including change orders of $2.9 million and $5.5 million, respectively. During the years ended December 31, 2016 and 2015, we completed 17 and 32 ACI systems, recognizing revenues of $26.9 million and $51.7 million and cost of revenue of $20.5 million and $38.4 million, respectively. We recognized $0.5 million and $0.1 million in loss provisions relatedfacilitate period to ACI system contracts during the years ended December 31, 2016 and 2015, respectively.

During the years ended December 31, 2016 and 2015, we entered into zero and one long-term (6 months or longer) fixed price contracts to supply DSI systems and other material handling equipment with contract values including associated change orders of $1.5 million and $2.4 million, respectively. During the years ended December 31, 2016 and 2015, we completed 11 and seven DSI systems and zero and two other material handling equipment systems, recognizing revenues of $15.8 million and $7.2 million and cost of revenue of $14.8 million and $5.9 million, respectively. During the year ended December 31, 2016, we recognized a reduction of $0.1 million in previously recognized loss provisions included in cost of revenue related to DSI system contracts. During the year ended December 31, 2015, we recognized $0.2 million in loss provisions included in costs of revenue related to DSI systems contracts.

Additionally, in 2016, we executed sales-type lease agreements related to ACI and DSI systems and recognized revenue of $3.4 million and cost of revenue of $1.2 million during the year ended December 31, 2016

The remaining changes were due to other equipment projects.

Demand for ACI and DSI system contracts during 2016 and 2015 was driven by coal-fired electric generating units that needed to comply with MATS and MACT standards by 2016. Revenues related to ACI and DSI system contracts in these years fluctuated due to changes in the number of contracts entered into as well as the long duration of completing certain contracts, which involved long-lead time requirements for manufacturing, installation and testing of the equipment.

Chemicals and Chemicals cost of revenue
During the years ended December 31, 2016 and 2015, revenues increased year over year primarily due to an overall increase in pounds of our chemicals sold, most significantly driven by higher sales of our M-Prove consumable during the second half of 2016. The increase in revenue was largely due to our increased focus on selling these products to coal-fired power plants to be in compliance with applicable regulations.



Consulting services and other and Consulting services cost of revenue
During the years ended December 31, 2016 and 2015, revenues decreased year over year due to a decrease in the number of consulting service engagements performed. The decrease in the number of consulting services engagements was due in part to us no longer performing consulting services engagements for one customer.

Additional information related to revenue concentrations and contributions by class and reportable segment can be found within the segment discussion below and in Note 13 to the Consolidated Financial Statements included in Item 8 of this Report.

Other Operating Expenses
A summary of the componentsperiod comparisons of our operating results. We believe the non-GAAP measures provide useful information to both management and users of the financial statements by excluding certain expenses, exclusivegains and losses that may not be indicative of costcore operating results and business outlook. Management uses these non-GAAP measures in evaluating the performance of revenue items (presented above),our business.
These non-GAAP measures are not in accordance with, or an alternative to, measures prepared in accordance with GAAP and may be different from non-GAAP measures used by other companies. In addition, these non-GAAP measures are not based on any comprehensive set of accounting rules or principles. These measures should only be used to evaluate our results of operations in conjunction with the corresponding GAAP measures.
We define Consolidated EBITDA as net income adjusted for the years ended December 31, 2016 and 2015 is as follows:
  Years Ended December 31, Change
(in thousands, except percentages) 2016 2015 ($) (%)
Operating expenses:        
Payroll and benefits $12,390
 $23,589
 $(11,199) (47)%
Rent and occupancy 2,168
 3,309
 (1,141) (34)%
Legal and professional fees 8,293
 16,604
 (8,311) (50)%
General and administrative 3,721
 6,104
 (2,383) (39)%
Research and development, net (648) 5,362
 (6,010) (112)%
Depreciation and amortization 979
 2,019
 (1,040) (52)%
Total operating expenses $26,903
 $56,987
 $(30,084) (53)%

Payroll and benefits
Payroll and benefits expenses decreased in 2016 compared to 2015 primarily due to a decrease in restructuring expenses in connection with the departure of certain executive officers and management's alignmentimpact of the business with strategic objectives. Duringfollowing items that are either non-cash or that we do not consider representative of our ongoing operating performance: depreciation, amortization, depletion, accretion, interest expense, net and income tax expense. We define Consolidated Adjusted EBITDA as Consolidated EBITDA reduced by the years ended December 31, 2016 and December 31, 2015, we recorded net restructuring charges of $1.6 million and $10.4 million, respectively, including the modification and accelerationnon-cash impacts of equity awards of $0.4 million and $3.4 million, respectively. Additionally, we had a decrease in headcount of approximately 70% during 2016 compared to 2015 in connection with employees impacted by management's alignment of the business with strategic objectives.

Rent and occupancy
Rent and occupancy expenses decreased in 2016 compared to 2015 primarily due to the shutdown of our office and fabrication facilities located in Pennsylvania in the fourth quarter of 2015. During the first quarter of 2016, we entered into an agreement to terminate various lease agreements covering approximately 207 thousand square feet of manufacturing, warehouse and office space in Pennsylvania. As consideration for terminating the leases, we agreed to pay the lessor a termination fee of $0.3 million in April 2016 and the same amount in April 2017. During the first quarter of 2016, we recorded a gain of $0.2 million related to the difference between the amount accrued as of the cease-use date of December 31, 2015 and the settlement amount. In December 2016, we entered into an agreement to terminate approximately 37 thousand square feet of office space and relocate our corporate office in Colorado. In exchange for terminating the lease, we agreed to pay the lessor a termination fee of $0.3 million. The amount was paid in full in December 2016.

Legal and professional fees
Legal and professional fees expenses decreased in 2016 compared to 2015 as a result of a reduction in the professional resources deployed to address the restatement of our consolidated financial statements, including litigation associated with such restatement. Expenses related to the restatement during the year ended December 31, 2016 and 2015 were $2.0 million and $9.5 million, respectively. In addition, legal and professional fees decreased as a result of a reduction in other consulting fees during 2016.

General and administrative
General and administrative expenses decreased in 2016 compared to 2015 due to a $0.5 million allowance recorded during 2015 against the entire principal balance of a note receivable. Additionally, during the year ended December 31, 2016, there was a decrease in expenses of $1.6 million due to the shutdown of our Pennsylvania office and fabrication facilities in the fourth quarter of 2015. Other decreases during the year ended December 31, 2016 were due to decreases in general operating expenses, including travel and professional expenses. These decreases were partially offset by impairment charges recognized

during the year ended December 31, 2016 on property and equipment and inventory of $0.5 million, as projected future cash flows from operations related to such property and equipment and inventory did not support the carrying value of these assets.
Research and development, net
Research and development expense decreased in 2016 compared to 2015 primarily due to a decrease in research and development activities in 2016, as we concluded all material research and development activities except for continued product development necessary to our ongoing business. We also reduced research and development expense by $0.8 million during the year ended December 31, 2016 due to final billings made during this period to the DOE for one research and development contract, which resulted in negative expense during 2016. Additional decreases in research and development expense were due to expenses incurred during 2015 related to our investment in ADA Analytics of $2.6 million, of which $1.9 million related to an impairment charge we recognized in 2015.

Depreciation and amortization
Depreciation and amortization expense decreased in 2016 compared to 2015 by approximately $0.8 million due to the shutdown of our Pennsylvania office and fabrication facility in 2015 and by approximately $0.2 million due to the termination of the Highview License.

Other Income (Expense), net
A summary of the components of our other income (expense), net for the years ended December 31, 2016 and 2015 is as follows:
  Years Ended December 31, Change
(in thousands, except percentages) 2016 2015 ($) (%)
Other income (expense):        
Earnings from equity method investments $45,584
 $8,921
 $36,663
 411 %
Royalties, related party 6,125
 10,642
 (4,517) (42)%
Interest income 268
 24
 244
 *
Interest expense (5,066) (8,402) 3,336
 (40)%
Litigation settlement and royalty indemnity expense, net 3,464
 
 3,464
 *
Other 2,463
 494
 1,969
 399 %
Total other income $52,838
 $11,679
 $41,159
 352 %

Earnings in equity method investments
The following table shows the equity method earnings by investee, for the years ended December 31, 2016 and 2015:
  Years Ended December 31, Change
(in thousands) 2016 2015 ($) (%)
Earnings from Tinuum Group $41,650
 $8,651
 $32,999
 381 %
Earnings from Tinuum Services 4,491
 4,838
 (347) (7)%
Earnings (losses) from other (557) (4,568) 4,011
 (88)%
Earnings from equity method investments $45,584
 $8,921
 $36,663
 411 %

Earnings from equity method investments and changes related thereto, were impactedgain on settlement, and increased by our equity method investees: Tinuum Group, Tinuum Services and RCM6 (through the date of the sale of our interest in RCM6 on March 3, 2016). Earningscash distributions from equity method investments, increased during the year ended December 31, 2016 compared to 2015 primarilyimpairment of long-lived assets and amortization of upfront customer consideration that was recorded as a resultcomponent of an increase in cash distributions,the Marshall Mine Acquisition ("Upfront Customer Consideration"). Because Consolidated Adjusted EBITDA omits certain non-cash items, we believe that the measure is less susceptible to variances that affect our operating performance.
We define APT Segment EBITDA Loss as Tinuum Group didAPT Segment operating loss adjusted for the impact of the following items that are either non-cash or that we do not invest significant capital expenditures related toconsider representative of our ongoing operating performance: depreciation, amortization, depletion, accretion and interest expense, net. We define APT Segment Adjusted EBITDA loss as APT Segment EBITDA loss reduced by gain on settlement and increased by impairment of long-lived assets and amortization of Upfront Customer Consideration.
We define RC Segment EBITDA as RC Segment operating income adjusted for the installationimpact of the following items that are either non-cash or that we do not consider representative of our ongoing operating performance: depreciation, amortization, depletion, accretion and interest expense. We define RC facilities or incur significant costs to operate retainedSegment Adjusted EBITDA as RC facilities during 2016 as they had done during 2015. See discussion below regardingSegment EBITDA reduced by the accountingnon-cash impact of earnings from Tinuum Group.

During the year ended December 31, 2016, we recognized $41.7 million in equity earnings from Tinuum Group compared to our proportionate share of Tinuum Group's net income of $35.0 million for the year. During the year ended December 31, 2015, we recognized $8.7 million in equity earnings from Tinuum Group compared to our proportionate share of Tinuum Group's net income of $35.3 million for the year. The difference between our pro-rata share of Tinuum Group's net income and our earnings recognized from our Tinuum Group equity method investmentinvestments and increased by cash distributions from equity method investments.
When used in conjunction with GAAP financial measures, we believe these non-GAAP measures are supplemental measures of operating performance that explain our operating performance for our period to period comparisons and against our competitors' performance. Generally, we believe these non-GAAP measures are less susceptible to variances that affect our operating performance results.
With the exception of impairment on long-lived assets and gain on settlement, the adjustments to Consolidated Adjusted EBITDA and APT Segment Adjusted EBITDA in future periods are generally expected to be similar. These non-GAAP measures have limitations as analytical tools, and should not be considered in isolation or as a substitute for analyzing our results as reported on the Condensed Consolidated Statements of Operations relates to us receiving cumulative distributions in excess of the carrying value of the investment, and therefore

recognizing such excess distributions as equity method earnings in the period the distributions occur, as discussed in more detail below.

The following table for Tinuum Group shows our investment balance, equity earnings, cash distributions received and cash distributions in excess of the investment balance for the years ended December 31, 2016 and 2015 (in thousands):

under GAAP.
35


Description Date(s) Investment balance ADES equity earnings (loss) Cash distributions Memorandum Account: Cash distributions and equity loss in (excess) of investment balance
Beginning balance 12/31/2014 $
 $
 $
 $(29,877)
ADES proportionate share of net income from Tinuum Group (1)
 2015 activity 35,265
 35,265
 
 
Recovery of cash distributions in excess of investment balance (prior to cash distributions) 2015 activity (29,877) (29,877) 
 29,877
Cash distributions from Tinuum Group 2015 activity (8,651) 
 8,651
 
Adjustment for current year cash distributions in excess of investment balance 2015 activity 3,263
 3,263
 
 (3,263)
Total investment balance, equity earnings (loss) and cash distributions 12/31/2015 $
 $8,651
 $8,651
 $(3,263)
ADES proportionate share of net income from Tinuum Group (1)
 2016 activity 35,019
 35,019
 
 
Recovery of cash distributions in excess of investment balance (prior to cash distributions) 2016 activity (3,263) (3,263) 
 3,263
Cash distributions from Tinuum Group 2016 activity (41,650) 
 41,650
 
Adjustment for current year cash distributions in excess of investment balance 2016 activity 9,894
 9,894
 
 (9,894)
Total investment balance, equity earnings (loss) and cash distributions 12/31/2016 $
 $41,650
 $41,650
 $(9,894)
Consolidated EBITDA and Consolidated Adjusted EBITDA

Year ended December 31,
20202019
Net (loss) income (1)
$(20,302)$35,537 
Depreciation, amortization, depletion and accretion8,537 7,371 
Interest expense, net3,793 6,913 
Income tax expense6,511 11,999 
Consolidated EBITDA (loss)(1,461)61,820 
Cash distributions from equity method investees62,441 73,888 
Equity earnings(30,978)(69,176)
Impairment26,103 — 
Gain on settlement(1,129)— 
Amortization of Upfront Customer Consideration158 — 
Consolidated Adjusted EBITDA$55,134 $66,532 
(1) The amounts of our 42.5% proportionate share of netNet income as shown in the table above differ from mathematical calculations of the Company’s 42.5% equity interest in Tinuum Group multiplied by the amounts of Net Income available to Class A members as shown in the table above of Tinuum Group results of operations due to adjustments related to the Class B preferred return and the elimination of Tinuum Group earnings attributable to RCM6, of which we owned 24.95%, for the period from January 1 to March 3, 2016 and for the year ended December 31, 2015.

Equity earnings from our interest in Tinuum Services decreased by $0.32019 was inclusive of a $5.0 million in 2016 compared to 2015 primarilyadjustment, which increased cost of revenue due to a decreasestep-up in the numberbasis of RC facilities being operated by Tinuum Services throughout the year. The weighted-average number of RC facilities for which Tinuum Services provided operating and maintenance services, based upon the number of months each facility was operated during the respective years, decreased year over year. As of December 31, 2016 and 2015, Tinuum Services provided operating and maintenance services to 13 and 14 RC facilities, respectively. Tinuum Services derives earnings from both fixed-fee arrangements as well as fees that are tied to actual RC production, depending upon the specific RC facility operating and maintenance agreement. The reduction in operating facilities during the year ended December 31, 2016 compared to the year ended December 31, 2015 was due to suspending operations on retained facilities to reduce operating expenses.

Equity losses from our interest in RCM6 decreased during the year ended December 31, 2016 compared to the year ended December 31, 2015 due to the sale of our 24.95% membership interest in RCM6 on March 3, 2016.

Tax credits
We earned the following tax credits that may be available for future benefitinventory acquired related to the production of RC from the operation of retained RC facilities:Carbon Solutions Acquisition.
  Years Ended December 31,
(in thousands) 2016 2015
Section 45 tax credits earned $2,956
 $38,998

The decrease in production and sale of RC, and the related tax credits earned during the year ended December 31, 2016 compared to December 31, 2015 was due to the suspension of retained RC facilities, as described above.

Royalties, related party
Royalty income decreased in 2016 compared to 2015 primarily due to a decrease from 2015 to 2016 in the number of RC facilities and related tons of RC produced using the M-45 License, which resulted in 16.2 million and 22.0 tons produced during 2016 and 2015, respectively. The decrease in tonnage was primarily due to the suspension of retained operations at facilities during the fourth quarter of 2015 and the first quarter of 2016 to reduce operating expenses. The decrease in royalties we earned in 2016 was also the result of higher Tinuum Group operating expenses in 2016 due to higher payments made to secure the location for an RC facility in advance of securing a lease or a sale with a tax equity investor.

Interest expense
Interest expense decreased in 2016 compared to 2015 due to a decrease in 453A interest and the elimination of the RCM6 Note Payable. These decreases were $2.1 million and $2.2 million, respectively, for the year ended December 31, 2016 compared to 2015. These decreases were offset by an increase in interest expense in 2016 of $0.7 million related to the Credit Agreement, which was entered into during the fourth quarter of 2015 and was paid off as of June 30, 2016.

During the year ended December 31, 2016 compared to 2015, there was an increase in RC facilities from 12 to 13 in which Tinuum Group recognized installment sales for tax purposes and are therefore subject to 453A interest.

The following table shows the balance of the tax liability that has been deferred and the applicable interest rate to calculate section 453A interest:
  As of December 31,
(in thousands) 2016 2015
Tax liability deferred on installment sales (1)
 $71,559
 $111,905
Interest rate 4.00% 4.00%

(1) Represents the approximate tax effected liability utilizing the federal tax rate in effect for the applicable years ended related to the deferred gain on installment sales (approximately $204 million as of December 31, 2016).

Revision of estimated litigation settlement and royalty indemnity expense, net
During the fourth quarter of 2016, management revised its estimate for future Royalty Award payments based on an updated forecast provided to the Company by a former equity method investment for which we are required to pay additional damages related to certain future revenues generated from the former equity method investment. This forecast included a material reduction in estimated future revenues generated at the specific activated carbon plant from which the royalties are generated. Based primarily on the updated forecast, management recorded a $4.0 million reduction to its Royalty Award accrual as of December 31, 2016.

During the year ended December 31, 2016, we recorded an expense for the estimated payment of monetary penalties in connection with litigation in the amount of $0.5 million.

Other
Gain on sale of equity method investment
On March 3, 2016, we sold our 24.95% membership interest in RCM6 for a cash payment of $1.8 million and the assumption, by the buyer, of the RCM6 Note Payable. The outstanding balance on the RCM6 Note Payable at the time of the sale was $13.2 million. With the sale of our membership interest in RCM6, we recognized a gain on the sale of $2.1 million, which is included within the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.

Gain on settlement of note payable
In February 2016, we entered into an agreement with the DSI Business Owner to settle the remaining amounts owed (the "DSI Business Owner Note Payable") of approximately $1.1 million for a one-time payment of $0.3 million. The one-time payment was made during the first quarter of 2016, and we recognized a gain of approximately $0.9 million, which is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.

Gain on settlement of licensed technology obligation
On June 15, 2016, we entered into an agreement with Highview to terminate the Highview License in exchange for a one-time payment by us of £0.2 million (approximately $0.2 million). According to the agreement, this amount is only payable upon the

sale of our shares in Highview to satisfy the liability. As a result of terminating this license agreement, we eliminated the licensed technology asset, reduced the corresponding long-term liability to the amount of the one-time payment, and recognized a gain of approximately $0.2 million, which is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.

Impairment of cost method investment
As of December 31, 2016, we estimated the fair value of the Highview Investment based upon an anticipated equity raise by Highview at a price of £2.00 per share, which was less than our cost per share of £4.25. As a result, we recorded an impairment charge of $1.8 million, which is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.

Gain on lease termination
In 2016, we and the lessee terminated a sale-type lease, and we recorded a lease termination fee of $3.6 million, which was in excess of the carrying value of the net investment in sales-type lease of $2.7 million. As a result of this lease termination, we recognized a gain of $0.9 million, which is included in the Other line item in the Consolidated Statements of Operations for the year ended December 31, 2016.

Income tax expense (benefit)
As of December 31, 2016 and 2015, we had a valuation allowance recorded of $75.9 million and $148.3 million, respectively, against our deferred tax assets. During 2016, we recorded an income tax benefit of $60.9 million compared to income tax expense of zero for 2015. The income tax benefit for 2016 primarily reflects a $61.4 million reversal of the valuation allowance of our deferred tax assets. Historically, we had recorded a valuation allowance for all of our deferred tax assets primarily due to a historical three-year cumulative loss position. However, as of December 31, 2016, we concluded that it was more likely than we will generate sufficient taxable income within the applicable NOL and tax credit carry-forward periods to realize $61.4 million of our net deferred tax assets and, therefore, reversed the valuation allowance by this amount. This conclusion was reached after weighing all of the evidence and determining that the positive evidence outweighed the negative evidence. The positive evidence considered by management in arriving at its conclusion to partially reverse the valuation allowance included factors such as the emergence from the previous three-year cumulative loss position during the fourth quarter of 2016, achievement of four consecutive quarters of profitability and forecasts of continued future profitability under several potential scenarios derived from currently contracted business within the RC segment. We believed these factors supported the partial utilization of deferred tax assets attributable to temporary differences that do not expire and NOL's and tax credits prior to their expiration between 2031 through 2036.

Business Segments
As of December 31, 2017,2020, we have two reportable segments: (1) RC;segments, RC and (2) EC.APT.
The business segment measurements provided to and evaluated by our chief operating decision maker ("CODM") are computed in accordance with the principles listed below:
The accounting policies of the operating segments are the same as those described in the summary of significant accounting policies except as described below.
Segment revenues include equity method earnings and losses from our equity method investments. Segment revenue also includes royalty earnings from Tinuum Group and income related to sales-type leases.
Segment operating income (loss) includes segment revenues, gains related to sales of equity method investments and allocation of certain "Corporate general and administrative expenses," which include Payroll and benefits, Rent and occupancy, Legal and professional fees, and General and administrative.administrative, and Depreciation, amortization, depletion and accretion.
RC segment operating income includes interest expense directly attributable to the RC segment.

The principal products and services of our segments are:

1.
RC - Our RC segment derives its earnings from equity method investments as well as royalty payment streams and other revenues related to enhanced combustion of and reduced emissions of both NOX and mercury from the burning of RC. Our equity method investments related to the RC segment include Tinuum Group, Tinuum Services as well as other immaterial equity method investments. Segment revenues include equity method earnings (losses) from our equity method investments and royalty earnings from Tinuum Group. These earnings are included within the Earnings from equity method investments and Royalties, related party line items in the Consolidated Statements of Operations included in Item 8 of this Report. Key drivers to RC segment performance are operating and retained produced and

sold RC, royalty-bearing tonnage, and the numberare described in Item 1 of operating (leased or sold) and retained RC facilities. These key drivers impact our earnings and cash distributions from equity method investments.

2.EC - Our EC segment includes revenues and related expenses from the sale of ACI and DSI equipment systems, chemical sales, consulting services and other sales related to the reduction of emissions in the coal-fired power generation and industrial boiler industries. These amounts are included within the respective revenue and cost of revenue line items in the Consolidated Statements of Operations included in Item 8 of this Report.

Management uses segment operating income (loss) to measure profitability and performance at the segment level. Management believes segment operating income (loss) provides investors with a useful measure of our operating performance and underlying trends of the businesses. Segment operating income (loss) may not be indicative of our overall consolidated performance and therefore, should be read in conjunction with our Consolidated Results of Operations.

this document. The following table presents our operating segment results for the years ended December 31, 2017, 20162020 and 2015:2019:
36


 Years Ended December 31, Change Years Ended December 31,Change
(in thousands) 2017 2016 2015 ($) ($)(in thousands)20202019($)
Revenues:          Revenues:
Refined Coal:          Refined Coal:
Earnings in equity method investments $53,843
 $45,584
 $8,921
 $8,259
 $36,663
Earnings in equity method investments$30,978 $69,176 $(38,198)
Consulting services 
 
 55
 
 (55)
Royalties, related party 9,672
 6,125
 10,642
 3,547
 (4,517)
 63,515
 51,709
 19,618
 11,806
 32,091
Emissions Control:          
Equipment sales 31,401
 46,949
 60,099
 (15,548) (13,150)
Chemicals 4,246
 3,025
 888
 1,221
 2,137
Consulting services 45
 648
 1,697
 (603) (1,049)
License royalties, related partyLicense royalties, related party13,440 16,899 (3,459)
44,418 86,075 (41,657)
Advanced Purification Technologies:Advanced Purification Technologies:
ConsumablesConsumables48,122 53,187 (5,065)
OtherOther15 — 15 
48,137 53,187 (5,050)
 35,692
 50,622
 62,684
 (14,930) (12,062)
Total segment reporting revenues $99,207
 $102,331
 $82,302
 $(3,124) $20,029
Total segment reporting revenues92,555 139,262 (46,707)
Adjustments to reconcile to reported revenues:          Adjustments to reconcile to reported revenues:
Refined Coal:          
Earnings in equity method investments $(53,843) $(45,584) $(8,921) (8,259) (36,663)Earnings in equity method investments(30,978)(69,176)38,198 
Royalties, related party (9,672) (6,125) (10,642) (3,547) 4,517
 (63,515) (51,709) (19,563) (11,806) (32,146)
          
Total reported revenues 35,692
 50,622
 62,739
 (14,930) (12,117)Total reported revenues$61,577 $70,086 $(8,509)
Segment operating income (loss)          Segment operating income (loss)
Refined Coal (1)
 $59,908
 $51,264
 $12,131
 $8,644
 $39,133
Refined Coal (1)
$42,689 $83,471 $(40,782)
Emissions Control (2)
 379
 7,334
 (7,583) (6,955) 14,917
Advanced Purification Technologies (2)
Advanced Purification Technologies (2)
(39,958)(13,600)(26,358)
Total segment operating income $60,287
 $58,598
 $4,548
 $1,689
 $54,050
Total segment operating income$2,731 $69,871 $(67,140)
(1) Included withinin the RC segment operating income for the yearyears ended December 31, 20162020 and 2019 is a $2.1453A interest expense of $0.3 million gain onand $1.0 million, respectively.
(2) Included in the sale of RCM6 andAPT segment operating loss for the years ended December 31, 2017, 20162020 and 2015 453A interest expense of $2.6 million, $2.52019 was $7.9 million and $4.6$7.2 million, respectively, of depreciation, amortization, depletion and interest expense related toaccretion expenses on mine- and plant-related long-lived assets and liabilities. Included in the RCM6 Note Payable of zero, $0.3 million, and $2.5 million, respectively.
(2) Included within the ECAPT segment operating incomeloss for the year ended December 31, 2016 is a $0.92020 was an impairment charge of $26.1 million offset by gain on settlement of $1.1 million. Included in the APT segment operating loss for the year ended December 31, 2019 was approximately $5.0 million of cost of revenue expense related to a terminationstep up in basis of a sales-type lease.

the fair value of inventory and of depreciation, amortization.
A reconciliation of segment operating income to consolidated net income (loss) is included in Note 1319 of the Consolidated Financial Statements included in Item 8 of this Report.


RCRefined Coal
The following table details the segment revenues of our respective equity method investments for the years ended December 31, 2017, 20162020 and 2015:2019:
Year ended December 31,
(in thousands)20202019
Earnings from Tinuum Group$24,396 $60,286 
Earnings from Tinuum Services6,582 8,896 
Earnings (loss) from other— (6)
Earnings from equity method investments$30,978 $69,176 
  Year ended December 31,
(in thousands) 2017 2016 2015
Earnings from Tinuum Group $48,875
 $41,650
 $8,651
Earnings from Tinuum Services 4,963
 4,491
 4,838
Earnings (losses) from other 5
 (557) (4,568)
Earnings from equity method investments $53,843
 $45,584
 $8,921

RC earnings increased primarily due to increasedFor 2020, equity earnings from Tinuum Group were positively impacted by the addition of two new RC facilities during the second half of 2019, three new RC facilities added during the year ended December 31, 2017 compared to2020 and the yearsale by Tinuum Group of its 49.9% remaining interest in an RC facility in the quarterly period ended December 31, 2016, as presented above. OurSeptember 30, 2020. However, equity earnings increased primarily due to an increase in cash distributions from Tinuum Group for 2020 decreased from 2019 primarily from the point-in-time revenue recognition in 2019 of two new RC facilities and due to higher depreciation recognized of approximately $4.9 million in 2020 on all Tinuum Group RC facilities as
37


a result of a reduction in RC facilities estimated useful lives as determined by Tinuum Group during the second half of 2019. Further contributing to the decrease in equity earnings for 2020 compared to 2019 was the restructuring of RC facility leases with Tinuum Group's largest customer in 2019, which decreased lease payments and equity earnings beginning in the second half of 2019, and the termination of two RC facility leases in the fourth quarter of 2019 for RC facilities located at two coal-fired utilities that were announced for closure in 2019. Also, in the fourth quarter of 2020, Tinuum Group recorded an impairment charge of $3.0 million on certain of its assets located at RC facilities and a retention accrual related to the wind down of its operations by the end of 2021.
As a result of higher depreciation, lower lease payments and the termination of RC facilities' leases throughout 2021 due to the addition of four invested facilities, three of which were fully invested by third parties, as discussed in the consolidated results above. For the year ended December 31, 2017, Tinuum Group's consolidated earnings increased $26.6 million from the comparable December 31, 2016 period due to an increase in lease revenues driven by significant sales of facilities to third-party investors.

As discussed above and in Note 2expiration of the Consolidated Financial Statements included in Item 8 of this Report,Section 45 tax period applicable to those RC facilities' leases, we expect our earnings in Tinuum Group may not equal our pro-rata shareto decrease in 2021. However, in 2021, and consistent with 2020, we expect that cash distributions will substantially exceed earnings.
RC earnings related to M-45 license royalties decreased from 2020 to 2019 as a result of reduction in the royalty rate per ton year over year offset by an increase in tonnage produced by RC facilities subject to the M-45 License.
Equity earnings from Tinuum Services decreased by $2.3 million in 2020 compared to 2019 primarily as a result of recording an impairment charge of $2.9 million for year ended December 31, 2020 as well as a reduction in tonnage for the RC facilities that Tinuum Services operated in 2020 compared to 2019. As of December 31, 2020 and 2019, Tinuum Services provided operating and maintenance services to 22 and 19 RC facilities, respectively. Tinuum Services derives earnings from both fixed-fee arrangements as well as fees that are tied to actual RC production, as determined by the specific RC facility operating and maintenance agreement.
Outlook
Both Tinuum Group and Tinuum Services expect to significantly wind down their operations by the end of 2021 due to the accounting relatedplanned expiration of the Section 45 tax credit period as of December 31, 2021, and the loss of equity earnings, distributions and M-45 Royalties beginning in 2022 will have a material adverse effect on our financial condition and consolidated operating results compared to our equity method investment.historical periods. Earnings in the RC segment for 2021 will continue to be impacted by coal-fired dispatch and invested facilities with leases subject to periodic renewals being terminated, repriced, or otherwise subject to renegotiated terms. As such,a result of higher depreciation and lower lease payments for 2021, as well as the expiration of the Section 45 tax program as of December 31, 2021, we expect our earnings in Tinuum Group to decrease in 2021. However, in 2021, and consistent with 2020, cash distributions will substantially exceed earnings.
RC Segment EBITDA and Adjusted EBITDA
Year ended December 31,
(in thousands)20202019
RC Segment operating income$42,689 $83,471 
Depreciation, amortization, depletion and accretion116 83 
Interest expense331 1,039 
RC Segment EBITDA43,136 84,593 
Cash distributions from equity method investees62,441 73,888 
Equity earnings(30,978)(69,176)
RC Segment Adjusted EBITDA$74,599 $89,305 
Advanced Purification Technologies
APT segment operating loss increased by $7.2 million during the year ended December 31, 20172020 compared to 2019 primarily due to the impairment charge of $26.1 million, a reduction in consumable revenue and associated margins and costs incurred related to COVID-19. During the year ended December 31, 20162020, Consumables revenue and margins also continued to be negatively impacted by low coal-fired power dispatch driven by power generation from sources other than coal and a decline in part due to $48.9 millionoverall U.S. power generation during 2020 of cash distributions received that were in excess of our pro-rata share of cumulative earnings in Tinuum Group.approximately 4.0%.

RC operating income in 2017 was also positively impacted for the following:

The sale of RCM6 in 2016, which had incurred losses from inception;
An increase in earnings from Tinuum Services, which was primarily due to an increase in the number of RC facilities operated by Tinuum Services during 2017;
An increase in M-45 royalties earned as a result of increased tonnage; and
A decrease in 453A interest expense as a result of the declining deferred tax liability.

EC
Discussion of revenues derived from our EC segment and costs related thereto are included within our consolidated results in Item 8 of this Report.
EC segment operating income decreased duringDuring the year ended December 31, 2017 compared2020, we incurred costs of $0.4 million related to 2016 primarily duesequestration of certain of our employees at our Red River plant. These costs included hazardous pay, lodging expense and other related costs for 60 days.
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Outlook
Based on current market estimates, we believe that the APT segment will continue to be negatively impacted, as power generation from coal-fired power plants declines and the decreasemarket focuses on other sources, including natural gas and renewable energy. Future demand will also be impacted by prices of competing energy sources such as natural gas. Low prices of alternative energy sources and decreasing power generation from coal-fired utilities reduce demand for our products. However, in revenues2021 and beyond, we expect the Supply Agreement to play significant roles in diversifying our product mix into markets outside of power generation.

APT Segment EBITDA Loss and Adjusted EBITDA Loss
Year ended December 31,
(in thousands)20202019
APT Segment operating loss (1)
$(39,958)$(13,600)
Depreciation, amortization, depletion and accretion7,870 7,206 
Interest expense, net402 368 
APT Segment EBITDA loss(31,686)(6,026)
Impairment26,103 — 
Gain on settlement(1,129)— 
Amortization of Upfront Customer Consideration158 — 
APT Segment Adjusted EBITDA loss$(6,554)$(6,026)
(1) Segment operating loss for the year over year, as discussed within the consolidated results. The decrease in EC segment operating incomeended December 31, 2019 was offset by decreases in segment operating expenses. Specifically, Payroll and benefits decreased year over year by $1.2inclusive of an adjustment of $5.0 million, primarilywhich increased cost of revenue due to a decreasestep-up in severance expensebasis of $1.0 million. Additional decreases in segment operating expenses were primarily due to a decrease in impairment charges of $1.3 millioninventory acquired related to the Highview investment. Offsetting the net decrease in segment operating expenses was the $0.9 million gain on settlement recognized in 2016 of the DSI Business Owner Note Payable as well as a $0.4 million reserve recorded in 2017 on an asset related to a letter of credit asset draw made by a former customer that we are contesting and pursing legal actions.Carbon Solutions Acquisition.



39


Liquidity and Capital Resources
Overview of Factors Affecting Our Liquidity
During 2017,2020, our liquidity position was positively affected primarily due tofrom cash distributions from Tinuum Group and Tinuum Services, royalty payments from Tinuum Group, PPP Loan distributions and borrowing availability under our bank ("Lender") line of credit (the "Line of Credit").
As a result, our working capital position as of December 31, 2017 improved by $14.8 million compared to December 31, 2016.
Our2020, our principal future sources of liquidity currently include:
cash on hand;and cash equivalents;
distributions from Tinuum Group and Tinuum Services;
royalty payments from Tinuum Group;
operations of the APT segment; and
the Line of Credit.
Our principal uses of liquidity duringFor the year ended December 31, 20172020, our principal uses of liquidity included:

our business operating expenses, including capital expenditures, reclamation costs, federal and state tax payments and cash severance payments,
payment of debt principal and interest;
payment of dividends; and
repurchases of shares of common stock pursuant to a modified Dutch Auction tender offer ("Tender Offer");stock.
repurchases of shares of common stock pursuant to a stock repurchase program by which the Company may repurchase up to $10.0 million of the Company's outstanding common stock, from time to time;
our business operating expenses, including federalTinuum Group and state tax payments;
delivering on our existing contracts and customer commitments; and
repayments on the Line of Credit.

Tinuum Services Distributions
The following table summarizes the cash distributions from our equity method investments, which most significantly impactaffected our consolidated cash flow results, for the years ended December 31, 2017, 20162020 and 2015:2019:
Year ended December 31,
(in thousands)20202019
Tinuum Group$53,289 $65,238 
Tinuum Services9,152 8,650 
Distributions from equity method investees$62,441 $73,888 
Cash distributions from Tinuum Group for 2020 decreased by $11.9 million compared to 2019 primarily due to reductions in lease payments received by Tinuum Group from its largest customer as a result of renegotiations of certain leases, which occurred in the second half of 2019 between Tinuum Group and this customer, and the shuttering of two coal-fired utilities in the fourth quarter of 2019 where two invested RC facilities were operating.
Future cash flows from Tinuum are expected to range from $70 to $90 million, and key drivers in achieving these future cash flows are based on the following:
23 invested facilities as of December 31, 2020 and inclusive of all net Tinuum cash flows (distributions and license royalties), offset by estimated federal and state income tax payments and 453A interest payments.
Expected future cash flows from Tinuum Group are based on the following key assumptions:
Tinuum Group continues to not operate retained facilities;
Tinuum Group does not have material unexpected capital expenditures or unusual operating expenses;
Tax equity lease renewals on invested facilities are not terminated or repriced; and
Coal-fired power generation remains consistent with existing contractual expectations.
Both Tinuum Group and Tinuum Services expect to significantly wind down their operations by the end of 2021 due to the expected expiration of the Section 45 tax credit period as of December 31, 2021. As such, our distributions from our RC segment will substantially cease as of December 31, 2021.

40


  Year ended December 31,
(in thousands) 2017 2016 2015

      
Tinuum Group $48,875
 $41,650
 $8,651
Tinuum Services 4,638
 4,500
 5,019
Other 
 
 
Distributions from equity method investees $53,513
 $46,150
 $13,670
PPP Loan
On May 5, 2017, our Board authorizedApril 20, 2020, we entered into the commencementPPP Loan under the PPP, evidenced by a promissory note, with BOK providing for $3.3 million in proceeds, which was funded on April 21, 2020. The PPP Loan matures April 21, 2022. The PPP Loan principal may be forgiven subject to the terms of the Tender OfferPPP and approval by the SBA. The interest rate on the PPP Loan is 1.00%. The PPP Loan is unsecured and contains customary events of default relating to, purchaseamong other things, payment defaults, making materially false and misleading representations to the SBA or BOK, or breaching the terms of the PPP Loan. The occurrence of an event of default may result in the repayment of all amounts outstanding, collection of all amounts owing from us, or filing suit and obtaining judgment against us.
Under the PPPFA, as defined above, monthly payments of principal and interest commence on the later of 10 months following the "covered period" (as defined in the PPPFA) or the date that BOK notifies us that the SBA has notified BOK that all or a portion of the PPP Loan has not been forgiven. In January 2021, we submitted an application to the SBA for forgiveness of the PPP Loan and we are awaiting the SBA's response on our application for forgiveness. Accordingly, we have determined that any amounts due under the PPP Loan would commence in August 2021.
Our business has been classified as an essential business, and therefore we continue to operate on a modified basis to comply with governmental restrictions and public health authority guidelines. In April 2020, we sequestered approximately 60 employees to continue to run our manufacturing plant and build-up inventory in order to supply our customers. This resulted in additional costs as the sequestered employees received hazard pay. We used proceeds from the PPP Loan to fund our payroll costs.
Restricted Cash
As of December 31, 2020, we had short-term restricted cash upof $5.0 million as required under a minimum cash balance requirement of a Senior Term Loan covenant, and long-term restricted cash of $5.0 million as required under the Surety Agreement related to 925,000the Reclamation Contract. Under the Surety Agreement, we are required to increase the restricted cash balance by $5.0 million as of March 31, 2021.
Senior Term Loan
On December 7, 2018, we executed the Senior Term Loan with Apollo in the principal amount of $70.0 million, less original issue discount of $2.1 million. We also paid debt issuance costs of $2.0 million related to the Senior Term Loan. The Senior Term Loan matures on December 7, 2021 and bears interest at a rate equal to 3-month LIBOR (subject to a 1.5% floor) + 4.75% per annum, which is adjusted quarterly to the current 3-month LIBOR rate, and interest is payable quarterly in arrears. As of December 31, 2020, we have $16.0 million in outstanding principal which, per the contractual requirements, we expect to fully repay in 2021. The Senior Term Loan is secured by substantially all of our assets, including the cash flows from Tinuum Group and Tinuum Services, but excluding our equity interests in those Tinuum entities.
The Senior Term Loan includes, among others, the following covenants: (1) As of the end of each fiscal quarter, we must maintain a minimum cash balance of $5.0 million and shall not permit "expected future net cash flows from the refined coal business" (as defined in the Senior Term Loan) to be less than 1.75 times the outstanding principal amount of the Senior Term Loan; (2) Annual collective dividends and buybacks of shares of our common stock at a price per sharein an aggregate amount, not to exceed $30.0 million, are permitted so long as (a) no default or event of notdefault exists under the Senior Term Loan and (b) expected future net cash flows from the refined coal business as of the end of the most recent fiscal quarter exceed $100.0 million. As of December 31, 2020, our expected future net cash flows from the refined coal business are less than $9.40 nor greater than $10.80, for a maximum aggregate purchase price of $10.0$100.0 million with an optionand we have no plans in 2021 to purchase an additional 2% of the outstanding shares of commoneither declare cash dividends on our stock if the Tender Offer was oversubscribed. The Tender Offer expired on June 6, 2017 and a total of 2,858,425 shares were validly tendered and not properly withdrawn at or below the final purchase price of $9.40 per share.
Because the Tender Offer was oversubscribed, we purchased a prorated portion of the shares properly tendered by each tendering stockholder (other than "odd lot" holders whose shares were purchased on a priority basis) at the final per share purchase price. Accordingly, we acquired 1,370,891repurchase shares of our common stock ("Tendered Shares") at a pricestock. See also "Item 1A Risk Factors" of $9.40 per share, for a total cost of approximately $12.9 million, excluding fees and other expenses relatedthis Report - "Risks relating to the Tender Offer. The Tendered Shares represented approximately 6.2% of our outstanding shares of our common stock prior to the Tender Offer. The Tendered Shares include the 925,000 shares we initially offered to purchase and 445,891 additional shares- There can be no assurance that we electedwill continue to purchase pursuant todeclare cash dividends at all or in any particular amounts."
Stock Repurchases and Dividends
In November 2018, our rightBoard authorized us to purchase up to an additional 2%$20.0 million of our outstanding sharescommon stock under a stock repurchase program (the "Stock Repurchase Program"), which was to remain in effect until December 31, 2019 unless otherwise modified by the Board. As of common stock.November 2019, $2.9 million remained outstanding related to Stock Repurchase Program. In November 2019, the Board authorized an incremental $7.1 million to the Stock Repurchase Program and provided that it will remain in effect until all amounts are utilized or it is otherwise modified by the Board.
41


During the year ended December 2017, our Board authorized the repurchase31, 2020, we paid quarterly cash dividends to stockholders of up to $10.0$4.6 million, which was paid on March 10, 2020.
Line of outstanding common stock in open market transactions. Credit
As of December 31, 2017, we had purchased 342,875 shares2020, there were no outstanding borrowings under the Line of common stock for cash payments of $3.4 million, inclusive of commissionsCredit.
In September 2013, ADA, as borrower, ADES, as guarantor, and fees.
Our Board declared quarterly cash dividends of $0.25 per share on the outstanding shares of our common stock on each of June 14, 2017, August 7, 2017, and November 6, 2017, payable to stockholders of record as of the close of business on June 28, 2017, August 21, 2017, and November 17, 2017, respectively. The payments of $5.2 million, $5.3 million and $5.2 million were subsequently made in July, September, and December 2017, respectively. The total amount of dividends paid by the Company during the twelve months ended December 31, 2017 was $15.7 million. Dividends in the amount of $0.1 million

have been accrued and represent dividends accumulated on nonvested shares of our common stock held by our employees and directors that contain dividend rights that are forfeitable and not payable until the underlying shares vest.

During the third quarter of 2017, we amendedLender entered into the Line of Credit ("Eleventh Amendment") withfor an aggregate principal amount of $10.0 million that was secured by certain amounts due to the Lender.Company from certain Tinuum Group RC leases. The Eleventh Amendment decreasedLine of Credit has been amended 14 times from the period from December 2, 2013 through December 31, 2020, which included a reduction in the principal amount to $5.0 million in September 2018.
On September 29, 2020, ADA, ADES and the Lender entered into an amendment to the Line of Credit to $10.0 million due to decreased collateral requirements for the Company's outstanding letters of credit ("LC's"(the "Fourteenth Amendment"), which extended the maturity date of the Line of Credit to September 30, 2018, and permittedMarch 31, 2021. In addition, the Fourteenth Amendment retained covenants from the prior amendments to the Line of Credit, which included ADA's ability to be usedenter into the Senior Term Loan as collateral (in placea guarantor so long as the principal amount of the Senior Term Loan did not exceed $70.0 million and the revision of covenants that were consistent with the Senior Term Loan covenants, including maintaining a minimum cash balance of $5.0 million.
Cash Flows
Cash, cash equivalents and restricted cash) for LC's up to $8.0cash increased from $17.1 million related to equipment projects, the remaining estimated payments due under the Royalty Award and certain other agreements. Additionally, under the Eleventh Amendment there is no minimum balance requirement based on the Company meeting certain conditions and maintaining minimum trailing twelve-month EBITDA (earnings before interest, taxes, depreciation and amortization as defined in the Eleventh Amendment) of $24.0 million.

As of December 31, 2017, there were no outstanding borrowings under the Line of Credit, however, LC's in the aggregate amount of $3.52019 to $35.9 million related to obligations due under the Royalty Award ("Royalty Award LC's") were secured under the Line of Credit, resulting in borrowing availability of $6.5 million. On December 29, 2017, pursuant to the execution of the Indemnity Termination Agreement on December 29, 2017, we settled all remaining obligations due under the Royalty Award in exchange for the Settlement Payment of $3.3 million resulting in remaining LC availability of $4.5 million. Pursuant to the Indemnity Settlement Agreement, the LC’s were terminated in January 2018.

Asas of December 31, 2016, we had Royalty Award LC's totaling $7.22020, an increase of $18.9 million. The following table summarizes our cash flows for the years ended December 31, 2020 and 2019, respectively:
Years Ended December 31,
(in thousands)20202019Change
Cash provided by (used in):
Operating activities$54,469 $62,262 $(7,793)
Investing activities(7,887)(13,238)5,351 
Financing activities(27,730)(55,716)27,986 
Net change in Cash and Cash Equivalents and Restricted Cash$18,852 $(6,692)$25,544 
Cash flows from operating activities
Cash flows provided by operating activities for the year ended December 31, 2020 decreased by $7.8 million outstanding thatcompared to the year ended December 31, 2019 and were collateralizednegatively impacted primarily by restricted cash.the following: (1) a decrease in Distributions from equity method investees, return on investment of $11.4 million; (2) a decrease of $5.2 million in deferred income tax expense; and (3) a reduction due to the Gain on settlement of $1.1 million recognized in 2020 . Offsetting these decreases to operating cash flows was primarily a decrease in earnings from equity method investments of $38.2 million and Impairment of long-lived assets of $26.1 million recorded in 2020.
During March 2017,Cash flows from investing activities
Cash flows used in investing activities for the year ended December 31, 2020 decreased by $5.4 million compared to the year ended December 31, 2019 primarily due to a customer drew on an LC relateddecrease in expenditures for mine development costs of $3.5 million. Also contributing to anthe decrease in cash flows used in investing activities were decreases in cash flows used in investing activities for acquisition of property, plant, equipment system inand intangibles of $1.2 million and the amountfinal cash payment for the Carbon Solutions Acquisition of $0.8$0.7 million, which was fundedmade in 2019.
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Cash flows from financing activities
Cash flows used in financing activities for the year ended December 31, 2020 were $27.7 million compared to cash flows provided by borrowing availability underfinancing activities of $55.7 million for the Lineyear ended December 31, 2019. This net decrease in cash flows used in financing activities was primarily due a decrease in dividends paid and shares repurchased of Credit. We subsequently repaid this amount$13.3 million and $5.6 million, respectively, in an effort to preserve cash due to uncertainties arising from the COVID-19 pandemic in 2020. Also contributing to the Lender duringdecrease were lower principal payments on the three months ended March 31, 2017. We are contesting the draw on this LCSenior Term Loan of $6.0 million and are pursuing actions to recover this amount$3.3 million of cash proceeds in 2020 from the customer.PPP Loan .

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Liquidity Outlook
Our ability to continue to generate sufficient cash flow required to meet ongoing operational needs and obligations, as well asand make potential future expected dividend payments and potential future share repurchases depends upon several factors, includingincludes executing on our contracts and initiatives, receiving royalty payments from Tinuum Group and distributions from Tinuum Group and Tinuum Services, and increasing our share of the market for EC products,APT consumables, including expanding our overall AC business into additional adjacent markets.
Our liquidity was negatively impacted from COVID-19 due to increased operating losses in our APT segment from higher operating costs as a result of measures taken to support our ability to deliver as a critical infrastructure business, primarily from sequestration efforts and "hazard pay," which is a premium on wages, for a substantial number of our employees, and overall plant operating inefficiencies. However, in particular EC chemicals sales. IncreasedApril 2020, we took steps to enhance our short-term liquidity through the PPP Loan as discussed above under this Item.
In 2021, our primary source of liquidity is expected to be distributions from Tinuum Group and Tinuum Services. These distributions in 2021 will provide sufficient cash on hand to fund operations in 2021 and 2022. For 2021, we expect to spend $9.5 million in capital expenditures compared to $7.1 million incurred in 2020. This increase is primarily the result of product specific capital related to the Supply Agreement and routine scheduled maintenance outages planned for 2021.
Due to the expiration of the Section 45 tax period as of December 31, 2021 and the resultant wind down of Tinuum Group's and Tinuum Services' operations by the end of 2021, distributions from Tinuum Group will likelyno longer be dependent upon both preserving existing contractual relationshipsa source of liquidity after 2021.
As we look to 2022 and beyond, our primary source of liquidity is expected to be through our ongoing operations from our APT segment. We believe the securing of additional tax equity investors for those Tinuum Group facilities that are currently not operating.
SourcesSupply Agreement will provide material incremental volume and Uses of Cash
Year ended December 31, 2017 Compared to Year ended December 31, 2016
Cash, cash equivalents and restricted cash increased from $26.9 million as of December 31, 2016 to $30.7 million as of December 31, 2017, an increase of $3.7 million. The following table summarizes our cash flows for the years ended December 31, 2017 and 2016, respectively.
  Years Ended December 31,  
(in thousands)
 2017 2016 Change
Cash provided by (used in):      
Operating activities $(11,748) $(18,257) $6,509
Investing activities 48,386
 39,899
 8,487
Financing activities (32,889) (15,671) (17,218)
Net change in Cash and Cash Equivalents and Restricted Cash $3,749
 $5,971
 $(2,222)
Cash flows fromcapture lower operating activities
Cash flows from operating activities for the year ended December 31, 2017 increased by $6.5 million compared to the year ended December 31, 2016 and were positively impacted primarily by the following: (1) a decrease in deferred tax benefit of $60.9 million, which was recorded in 2016 as a result of the release of a portioncost efficiencies of our valuation allowance on our deferred tax assets; (2) a decrease in deferred tax assets during 2017 of $23.2 million as a result of utilization in 2017 as we generated taxable income; (3) net changes in working capital and other liabilities of $10.6 million, primarily due to significant reductions to Accounts payable, Accrued payroll, Other current liabilities and Other long-term liabilities that occurred in 2016 as a result of the Company becoming current on, or settling, significant amounts related to these liabilities. Offsetting these increases to operating cash flows were primarily the following: (1) a decrease in net income of $69.8 million, which was primarily due to

the deferred tax benefit recorded in 2016; (2) an increase in earnings from equity method investees of $8.3 million; (3) a net decrease in the Royalty Award of $7.6 million in 2017 as a result of the final payments and settlement of all remaining royalties due; and (4) a decrease in cash distributions from equity method investees, return on investment of $3.3 million, primarily from a decrease in cash distributions received from Tinuum Group, as all of its cash distributions for 2017 were reported as distributions in excess of cumulative earnings within Investing cash flows.

Cash flows from investing activities
Distributions from equity method investees
Our cash flows from investing activities are significantly impacted by cash distributions from equity method investees that represent a return in excess of cumulative earnings, which increased from $38.3 million in 2016 to $48.9 million in 2017. All of these cash distributions were received from Tinuum Group. During the year ended December 31, 2016, Tinuum Group distributions of $3.4 million were reported within operating cash flows, and $38.3 million were reported within investing cash flows.

Equity method investment
Cash flows from investing activities for the year ended December 31, 2017 also decreased as a result of the cash proceeds received of $1.8 million from the sale of RCM6 in 2016, as discussed in Note 2 of the Consolidated Financial Statements included in Item 8 of this Report.

Cash flows from financing activities
Dividends Paid and Stock Repurchases
During the year ended December 31, 2017, we paid Dividends of $15.7 million. In addition, during the year ended December 31, 2017, we repurchased 1,370,891 shares of our common stock in the amount of $13.0 million pursuant to the Tender Offer conducted in May and June of 2017 and 342,875 shares of our common stock in the amount of $3.4 million in open market transactions that occurred in December 2017.

Short term borrowings
During the year ended December 31, 2016, we repaid all principal amounts due under the Credit Agreement of $13.3 million, including the pay-off amount of $9.9 million, which occurred as a result of the termination of the Credit Agreement on June 30, 2016. During the year ended December 31, 2016, we paid $0.8 million in debt issuance costs related to the Second Amendment of the Credit Agreement and amendment fees related to the Line of Credit. Additionally, during the year ended December 31, 2016, we paid a debt prepayment penalty of $0.2 million for the pay-off the Credit Agreement prior to maturity. During the year ended December 31, 2017, we paid fees in connection with amendments to the Line of Credit of approximately $0.1 million.

Notes payable activity
During the year ended December 31, 2016, we repaid $1.2 million of principal on the RCM6 and the DSI Business Owner Notes Payable.

Equity Award Activity
During the years ended December 31, 2017 and 2016, we used cash of $0.6 million and $0.2 million, respectively, for the repurchase of shares to satisfy tax withholdings upon the vesting of equity-based awards.
Year ended December 31, 2016 Compared to Year ended December 31, 2015
Cash, cash equivalents and restricted cash increased from $21.0 million as of December 31, 2015 to $26.9 million as of December 31, 2016, an increase of $6.0 million.
  Years Ended December 31,  
(in thousands)
 2016 2015 Change
Cash provided by (used in):      
Operating activities $(18,257) $(29,869) $11,612
Investing activities 39,899
 4,334
 35,565
Financing activities (15,671) 10,029
 (25,700)
Net change in Cash and Cash Equivalents and Restricted Cash $5,971
 $(15,506) $21,477

Cash flows from operating activities
Cash flows from operating activities for the year ended December 31, 2016 increased by $11.6 million compared to the year ended December 31, 2015 and were positively impacted primarily by the following: (1) an increase in net income, which was $97.7 million for the year ended December 31, 2016, compared to a net loss of $30.1 million in 2015; (2) an increase in cash distributions from equity method investees, return on investment of $2.9 million; and (3) net changes in working capital and other liabilities, primarily due to significant reductions as a result of a reduction in the professional resources deployed to address the restatement. Offsetting these increases to operating cash flows were primarily the following: (1) a decrease in deferred tax benefit of $61.4 million, which was a result of the release of a portion of our valuation allowance on our deferred tax assets; (2) an increase in earnings from equity method investees of $36.7 million, primarily received from Tinuum Group; and (3) deferred revenue and project costs resulted in a change in a useRed River plant, providing additional sources of operating cash flows in the future. Full and partial reimbursements on a net basiscapital expenditures from Cabot will help limit our uses of $6.0 million dueinvesting cash flows. Further, we intend to productionfund the remaining portion of ACI and DSI equipment systems.
Cash flowthe Reclamation Costs from investing activities

Distributions from equity method investees
Our cash flows from investing activities are significantly impacted byon hand as well as cash distributions from equity method investees that represent a return in excess of cumulative earnings, which increased from $8.7 million in 2015 to $36.3 million in 2016. All of these cash distributions were received from Tinuum Group.

Maturity of investments in securities, restricted
During 2016, we ceased to pledge investments to support letters of credit and instead used restricted cash as necessary.

Acquisition and disposal of property and equipment, net
Acquisitions of property and equipment were $0.3 million and $0.5 million for the years ended December 31, 2016 and December 31, 2015, respectively.

Proceedsgenerated from the sale of propertySupply Agreement. In 2022 and equipment, netbeyond, our capital expenditures are expected to average approximately $5.0 million.
Proceeds from the sale of property and equipment were $0.1 million and $0.9 million for the years ended December 31, 2016 and December 31, 2015, respectively. During 2015, we disposed of property and equipment related to the termination of manufacturing operations at our Pennsylvania fabrication facility.


Advance on note receivable
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In December 2014, we loaned $0.5 million to an independent third party to provide financing for the pursuit of emissions technology projects, bearing annual interest of 8%. Interest and principal were payable at maturity of the agreement in June 2015. In March 2015, we loaned an additional $0.5 million to the third party, also bearing annual interest at 8%. All interest and principal payments under both loans were then deferred until March 2018.



Acquisition of a business
During March 2015, we acquired certain assets of Clearview Monitoring Solutions Ltd. ("Clearview"), which operated as ADA Analytics, for $2.4 million cash, $2.1 million of which was paid during 2015. We acquired the in-process research and development assets of Clearview in order to potentially commercialize and expand our analytics services available to customers. However, in August 2015, as part of a broader strategic restructuring of our business to simplify our operating structure in a manner to increase customer focus, better support sales and product delivery and also align our cost structure as the EC market shifted towards compliance solutions for MATS, our management approved an action to wind down operations of ADA Analytics.

Equity method investment
On February 10, 2014, we purchased a 24.95% membership interest in RCM6, which owned a single RC facility that produced RC that qualified for Section 45 tax credits. As part of the purchase, we were subject to quarterly capital calls and variable payments based upon differences in originally forecasted RC production as of the purchase date and actual quarterly production. During the years ended December 31, 2016 and 2015, we funded capital calls and made variable payments of $0.2 million and $2.4 million, respectively. We sold our investment in RCM6 in March 2016 and received proceeds from the sale of $1.8 million in cash and the assumption, by the buyer, of all unpaid amounts outstanding under the RCM6 Note Payable.

Cash flow from financing activities

Short term borrowings
During the year ended December 31, 2016, we repaid all principal amounts due under the Credit Agreement of $13.3 million, including the pay-off amount of $9.9 million, which occurred as a result of the termination of the Credit Agreement on June 30, 2016. During the year ended December 31, 2016, we paid $0.8 million in debt issuance costs related to the Second Amendment of the Credit Agreement and amendment fees related to the Line of Credit. Additionally, during the year ended December 31, 2016, we paid a debt prepayment penalty of $0.2 million for the pay-off the Credit Agreement prior to maturity.

Notes payable activity
During the year ended December 31, 2016 and 2015 we used $1.2 million and $1.5 million cash, respectively, for repayments of principal on the RCM6 and the DSI Business Owner Notes Payable,

Contractual Obligations
Our contractual obligations as of December 31, 20172020 are as follows:
Payment Due by Period
(in thousands)(in thousands)TotalLess than 1 year1-3 years4-5 yearsAfter 5 years
 Payment Due by Period
(in thousands) Total Less than 1 year 1-3 years 4-5 years After 5 years
Operating leases $585
 $298
 $287
 $
 $
Senior Term Note (1)
Senior Term Note (1)
$16,000 $16,000 $— $— $— 
Finance lease obligationsFinance lease obligations6,344 1,859 1,988 2,497 — 
Operating lease obligationsOperating lease obligations3,119 1,994 1,125 — — 
 $585
 $298
 $287
 $
 $
Reclamation liability, Marshall Mine (2)
Reclamation liability, Marshall Mine (2)
20,281 10,257 8,122 1,109 793 
$45,744 $30,110 $11,235 $3,606 $793 
We have not included(1) Includes outstanding principal amounts due through the maturity date of the Senior Term Loan.
(2) Includes payments due under a capped fee contract with a third-party mining operator for reclamation of the Marshal Mine (the "Marshall Mine ARO"). Payments on this contract are due through approximately 2031. Reclamation costs related to the Marshall Mine ARO are based on a stated fee by month structure, based on the initial estimate of the total costs of reclamation, which provides for certain contingencies that could increase or decrease the reclamation fee over time. The timing of payments may vary, and the Company accounts for these timing differences in valuing the reclamation on a quarterly basis. As well, the Company accounts for changes in actual reclamation costs on a quarterly basis.
The table above excludes obligations related to 453A interest payments, which are variable due to uncertainty of amounts payableannual changes in future periods relating to matters impacting future obligations such as the statutory rate established by the IRS and changes in Tinuum Group's deferred tax liability balanceliabilities associated with taxes that have been deferred under the installment method at each futurefor sales or leases of certain of Tinuum Group's RC facilities. We do not expect that our obligations for 453A interest will be material for 2021. During 2021, Tinuum Group will be likely closing RC facilities commensurate with the expiration of the Section 45 tax credit period, which expires 10 years after a respective facility was in service and eligible to generate Section 45 tax credits. As a result, Tinuum Group's composite deferred tax liability will decline through 2021 and our 453A interest payments will also decline in proportion to the decrease in Tinuum Group's deferred tax liability.
The table above also excludes our asset retirement obligation ("ARO") related to reclamation of the Five Forks Mine (the "Five Forks ARO"). As of December 31, 2020, our consolidated balance sheet datereflects a liability of $3.3 million for the Five Forks ARO. The Five Forks Mine ARO was recorded at fair value. The timing and changes in interest rates. Ifamount of payments to satisfy the Five Forks ARO are uncertain and are based on numerous factors including, but not limited to, the Five Forks Mine closure date.
We had no additional RC facilities become invested in the future, the deferred liability balance would decrease and interest payments, assuming no changes in the applicable tax and interest rates, would also decrease throughout the periods in the table above.
Outstandingoutstanding letters of credit were issued in connection with equipment sales agreements, collateral support for future obligations due under the Royalty Award and other items. A summaryas of the information related to our letters of credit is as follows:December 31, 2020.
  Total Outstanding        
  As of December 31, Expiration of Letters of Credit as of December 31, 2017
(in thousands) 2017 Less than 1 year 1-3 years 4-5 years After 5 years
LC's $3,500
 $3,500
 $
 $
 $
Additional information related to the letters of credit is included in Note 4 to the Consolidated Financial Statements included in Item 8 of this Report.
Off-Balance Sheet Arrangements
During 2017, 2016Surety Bonds
As of December 31, 2020, we had outstanding surety bonds of $36.7 million related to performance requirements under reclamation contracts associated with both the Five Forks Mine and 2015,the Marshall Mine. As of December 31, 2020, we did not engage in any off-balance sheet financing activities other than those includedhad restricted cash of $5.0 million securing the Surety Agreement and will be required to post an additional $5.0 million of restricted cash on March 31, 2021. We expect that the obligations secured by these surety bonds will be performed in the “Contractual Obligations” discussion aboveordinary course of business and those reflected in Note 4accordance with the applicable contractual terms. To the extent that the obligations are performed, the related surety bonds should be released, and we should not have any continuing obligations. However, in the event any surety bond is called, our indemnity obligations could require us to reimburse the Consolidated Financial Statements included in Item 8issuer of this Report. the surety bond.
Critical Accounting Policies and Estimates
Our significant accounting policies are discussed in Note 1 to the Consolidated Financial Statements included in Item 8 of this Report. In presenting our financial statements in conformity with accounting principles generally accepted in the United States ("U.S. GAAP"),GAAP, we are required to make estimates and assumptions that affect the amounts reported therein. Several of the estimates and assumptions we are required to make relate to matters that are inherently uncertain as they pertain to future events. Our estimates are based on historical experience and other assumptions believed to be reasonable under the circumstances, and we evaluate these estimates on an ongoing basis. Actual results may differ from these estimates under different assumptions or conditions.
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We believe that the accounting estimates discussed below are critical to understanding our historical and future performance, as these estimates relate to the more significant areas involving management’s judgments and estimates.

Revenue RecognitionBusiness Combinations, including asset acquisitions
We recognize revenue when: (i) persuasive evidenceallocate the purchase price of aacquired companies to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values at the acquisition date. This also includes accounting for asset acquisitions. The purchase price allocation process requires us to make significant estimates and assumptions with respect to assets acquired and liabilities assumed. Although we believe the assumptions and estimates we have made are reasonable, they are based in part on historical experience, market conditions and information obtained from management of the acquired company or group of assets and are inherently uncertain. Examples of critical estimates in valuing certain of the intangible assets we have acquired or may acquire in the future include but are not limited to:
future expected cash flows from revenues;
historical and expected customer arrangement exists; (ii) attrition rates and anticipated growth in revenues from acquired customers;
the price is fixed or determinable; (iii) collectability is reasonably assured;acquired company’s developed technology as well as assumptions about the period of time the acquired developed technology will continue to be used in the combined company's product portfolio;
the expected use and (v) product delivery has occurred or services have been rendereduseful lives of the acquired assets; and it is probable that performance guarantees, if any, will be met.
Equipment salesvaluation methods and discount rates used in estimating the values of the assets acquired and liabilities assumed.
In regard to the Marshall Mine Acquisition, which was accounted for as an asset acquisition, we recorded the fair value of assumed assets, which included property, plant and equipment and spare parts and assumed liabilities, which included accrued liabilities. In addition, we recorded assets including, Upfront Customer Consideration and the Cabot Receivable, and liability of Marshall Mine ARO.
Carrying value of long-lived assets and intangibles
We have entered into contractsreview and evaluate our long-lived assets and intangibles for impairment at least annually, or more frequently when events or changes in circumstances indicate that require, over a period of months, the designrelated carrying amounts may not be recoverable. An impairment loss is measured and construction of emissions control systems ("extended equipment contracts"). Revenue from such extended equipment contracts is recorded using the percentage of completion, cost to cost methodfor long-lived assets and intangibles based on costs incurred to date compared with total estimated contract costs. However, if there is not sufficient information to estimate costs for extended equipment contracts at the time the contract was entered into, the completed contract method is used.
Under the completed contract method, revenues and costs from extended equipment contracts are deferred and recognized when contract obligations are substantially complete. We define substantially complete as delivery of equipment and start-up at the customer site, and, as applicable to DSI systems, the completion of any major warranty service. Such costs are accumulated in the Costs in excess of billings on uncompleted contracts line itemtheir carrying amounts over their estimated fair values. Fair value is typically determined through the use of an income approach utilizing estimates of discounted pre-tax future cash flows or a market approach utilizing recent transaction activity for comparable properties.
Asset Retirement Obligations
Accounting for AROs requires management to make estimates of future costs unique to a specific mining operation that we will incur to complete the reclamation and remediation work required to comply with existing laws and regulations. Any such changes in future costs, the Consolidated Balance Sheets included in Item 8timing of this Reportreclamation activities, scope, or the exclusion of certain costs not considered reclamation and typically include direct materials, direct laborremediation costs, could materially impact the amounts charged to earnings for reclamation and subcontractor costs,remediation. Additionally, future changes to environmental laws and indirectregulations could increase the extent of reclamation and remediation work required.
Five Forks Mine ARO - Reclamation costs related to contract performance, such as indirect labor, supplies, toolsthe Five Forks Mine ARO are allocated to expense over the life of the related mine assets, and repairs. Basedare periodically adjusted to reflect changes in the estimated present value resulting from the passage of time and revisions to the estimates of either the timing or amount of the reclamation costs. Remediation costs for the Five Forks Mine are accrued based on management’s best estimate at the end of each period of the costs expected to be incurred. Such cost estimates may include ongoing care, maintenance and monitoring costs. Reclamation obligations are based on the above factors,timing of estimated spending for each ofan existing environmental disturbance. We review, on at least an annual basis, the years ended December 31, 2017, 2016 and 2015, we recognized revenue under the completed contract method in which revenues andFive Forks Mine ARO.
Marshall Mine ARO - Reclamation costs were deferred until the equipment was placed into service and contract obligations were substantially complete.
When multiple contracts exist with a single counterparty, we evaluate revenue recognition on a contract by contract basis. Provisions for estimated losses on uncompleted contracts are recognized when it has been determined that a loss is probable.
Costs of revenue include all labor, fringe benefits, subcontract labor, chemical and coal costs, materials, equipment, supplies, travel costs and any other costs and expenses directly related to the production of revenue. To the extent that they occur, we recognize estimated loss provisions related to contracts in the period that the potential loss is identified.
In addition, warranty costs for ACI equipment systemsMarshall Mine are estimated based on historical experience and are recorded as a percentage of revenue when the equipment is substantially complete. Warranty costs, comprised of the cost of replacement materials and direct labor, are included within the Equipment sales cost of revenue line of the Consolidated Statements of Operations included in Item 8 of this Report.
Warranty costs for DSI equipment systems could not be estimated at the time the contracts were entered into due to a lack of historical experience manufacturing DSI systems and the resulting claims history, if any, needed to determine an appropriate warranty cost estimate. As warranty claims are incurred, such costs have been deferred within the Costs in excess of billings on uncompleted contracts line item in the Consolidated Balance Sheets included in Item 8 of this Report until such time that revenue and cost of revenue are recognized.
Demand for ACI and DSI system contracts was historically driven by coal-fired electric generating units that needed to comply with MATS and MACT. As the deadline for these standards has passed, we do not expect to enter into any future extended equipment contracts for ACI and DSI systems.
Additional details related to long-term equipment revenues, and the expected impact to the Company's consolidated financial statements upon the adoption of the FASB's ASC 606 - Revenue from Contracts with Customers ("ASC 606"), which we will adopt effective January 1, 2018,are described in Note 1 of the Consolidated Financial Statements included in Item 8 of this Report.
Royalty Award
During 2015, 2016 and 2017, we estimated future obligations due under the Royalty Award, which represented significant liabilities to us. Our estimates of amounts due under the Royalty Award were based upon projections of future revenues, as provided by Carbon Solutions. During the years ended December 31, 2017 and 2016, we revised our estimates and recorded reductions of $3.4 million and $4.0 million to the Royalty Award liability. In December 2017, we settled all future obligations due under the Royalty Award through the execution of the Indemnity Termination Agreement and the related Settlement Payment of $3.3 million. Refer to Note 4 of our Consolidated Financial Statements included in Item 8 of this Report for additional information regarding the Royalty Award.

Stock-Based Compensation Expense

We grant certain executives stock options that generally vest based on performance measures and the grantee's continuous service with us. Compensation expense is recognized for these options on a straight-line basis over the estimated service periodcapped fee structure, based on the estimated fair value at the date of grant using a Black-Scholes model. Different estimates of key inputs in the Black-Scholes model such as the expected term of an option and the expected volatility of our stock price, the estimate of dividends, as well as ourinitial estimate of the service period,total costs of reclamation, which provides for certain contingencies that could impactincrease or decrease the share-based compensation expense we would recognize over the award period in our Consolidated Statements of Operations. Refer to Note 6 of our Consolidated Financial Statements included in Item 8 of this Report for additional information regarding our stock option awards.
Estimated Company Contribution to the 401(k) Plan
As part of an ongoing investigation of our 401(k) Plan by the Department of Labor ("DOL"), we have estimated and recorded a liability in the amount of $1.0 million for a potential contribution we may need to make to the 401(k) Plan. The estimate isreclamation fee based on information currently available tothe reclamation agreement executed between us and involves elementsthe Marshall Mine operator. The timing of judgmentpayments may vary, and significant uncertainties. The DOL has not issued any formal findings as of the date of this Report and, although we believe there has been no breach of fiduciary duty with respect toCompany accounts for these timing differences in valuing the 401(k) Plan, we believe that it is probable thatreclamation on a quarterly basis. As well, the DOL will require us to make some contribution to the 401(k) PlanCompany accounts for changes in order to close the investigation. We have determined that this amount is both probable and reasonably estimable and, as such, we have recordedactual reclamation costs on a liability and related expense of $1.0 million as of December 31, 2017 and for the year ended December 31, 2017, respectively. Refer to Note 4 of our Consolidated Financial Statements included in Item 8 of this Report for additional information regarding this matter.quarterly basis.
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Income Taxes
We account for income taxes as required by U.S. GAAP, under which management judgment is required in determining income tax expense and the related balance sheet amounts. This judgment includes estimating and analyzing historical and projected future operating results, the reversal of taxable temporary differences, tax planning strategies, and the ultimate outcome of uncertain income tax positions. Actual income taxes paid may vary from estimates, depending upon changes in income tax laws, actual results of operations, and the final audit of tax returns by taxing authorities. Tax assessments may arise several years after tax returns have been filed. Changes in the estimates and assumptions used for calculating income tax expense and potential differences in actual results from estimates could have a material impact on our results of operations and financial condition.
Deferred tax assets and liabilities are determined on the basis of the differences between the financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date.    
We recognize deferred tax assets to the extent that we believe these assets are more likely than not to be realized. In making such a determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies and results of recent operations.

We establish a valuation allowance against our deferred tax assets when, based upon the weight of all available evidence, we believe it is more likely than not that some portion or all of the deferred tax assets will not be realized. As of December 31, 20172020 and 2016,2019, we have established valuation allowances for our deferred tax assets that, in our judgment, will not be realized. In making this determination, we have considered the relative impact of all of the available positive and negative evidence regarding future sources of taxable income and tax planning strategies. However, there could be a material impact to our effective tax rate if there is a significant change in our estimates of future taxable income and tax planning strategies. If and when our estimates change, or there is a change in the gross balance of deferred tax assets or liabilities causing the need to reassess the realizability of deferred tax assets, thenwe adjust the valuation allowances are adjustedallowance through the provision for income taxes in the period in which this determination is made. Refer to Note 1218 of our Consolidated Financial Statements included in Item 8 of this Report for additional information regarding our net deferred tax assets and related deferred income tax expense (benefit).

Recently Issued Accounting Standards

Refer to Note 1 of the Consolidated Financial Statements included in Item 8 of this Report for information regarding recently issued accounting standards.

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Item 7A. Quantitative and Qualitative Disclosures About Market Risk
Interest Rate RiskThe information under this Item is not required to be provided by smaller reporting companies.
We are exposed to market risk from changes in interest rates. Our assets include cash equivalents subject to variable interest rates. As of December 31, 2017, $30.7 million of cash was earning interest at 0.35%.
We are exposed to interest rate risk related to our obligations to pay 453A interest to the IRS. As of December 31, 2017, the applicable 453A interest rate, which, according to the applicable rules is rounded to the nearest full percentage to determine interest due, which as of December 31, 2017 was 4.00%. A change of 1% in the applicable interest rate during the year ended December 31, 2017 would have caused a change in pretax income of $0.6 million.
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We are also exposed to interest rate risk in connection with the Line of Credit, if amounts are drawn, which bears interest at a variable rate, which is the higher of 5% or the "Prime Rate" plus 1%. As of December 31, 2017 the Prime Rate was 4.50%, but no amounts were outstanding on the Line of Credit.

Using the December 31, 2017 cash balances, a 10% proportionate increase in short-term interest rates on an annualized basis compared to the actual interest rates as of December 31, 2017, and a corresponding and parallel shift in the remainder of the yield curve, would result in an increase to pretax income of $12 thousand. Conversely, a corresponding decrease in interest rates would result in a comparable decrease to pretax income. Actual interest rates could change significantly more than 10%. There are inherent limitations in the sensitivity analysis presented, primarily due to the assumption that interest rate movements are not linear and instantaneous. As a result, the analysis is unable to reflect the potential effects of more complex market changes that could arise, which may positively or negatively affect pretax income.

Commodity Price Risk
In the normal course of our business, we are exposed to market risk or price fluctuations related to the goods we procure related to our revenue-producing activities. The manufacturing of our chemical products is dependent upon certain discrete chemicals that are prone to significant price fluctuations and supply constraints. Further, there are a limited number of suppliers that provide ingredients needed to manufacture our proprietary chemicals that are used at a customer's power plant, which makes us vulnerable to potential price increases from our suppliers that could negatively impact our gross margins if we are unable to increase the selling price to our customers. We do not engage in commodity hedging transactions for raw materials, though we have committed and will continue to commit to purchase certain materials for specified periods of time. Significant increases in the prices of our products due to increases in our suppliers' cost of discrete chemicals could have a negative effect on demand for products and on profitability. We may not be able to pass cost increases on to our customers, and our margins maybe negatively impacted given the competitive prices of other products within the mercury control market.

Item 8. Financial Statements and Supplementary Data

Advanced Emissions Solutions, Inc.
Index to Financial Statements



49



Report of Independent Registered Public Accounting Firm


To the Stockholders and the Board of Directors of
Advanced Emissions Solutions, Inc. and Subsidiaries


Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheetsheets of Advanced Emissions Solutions, Inc. and subsidiaries (the “Company”)Company) as of December 31, 2017,2020 and 2019, the related consolidated statements of operations, changes in stockholders’ equity and cash flows for the yearyears then ended, and the related notes (collectively referred to as the “consolidated"consolidated financial statements”statements"). In our opinion, the consolidated financial statements present fairly, in all material respects, the consolidated financial position of the Company as of December 31, 2017,2020 and 2019, and the consolidated results of its operations and its cash flows for the yearyears then ended, in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated March 12, 2018, expressed an unqualified opinion on the Company’s internal control over financial reporting.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s consolidated financial statements based on our audit.audits. We are a public accounting firm registered with the PCAOBPublic Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our auditaudits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.
Our auditaudits included performing procedures to assess the risks of material misstatement of the consolidatedfinancial statements, whether due to error or fraud, and performing procedures to respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our auditaudits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our auditaudits provides a reasonable basis for our opinion.

Critical Audit Matters
The critical audit matters communicated below are matters arising from the current period audit of the consolidated financial statements that were communicated or required to be communicated to the audit committee and that (1) relate to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing a separate opinion on the critical audit matters or on the accounts or disclosures to which they relate.
Income Taxes – Realizability of Deferred Tax Assets
As described in Notes 1 and 18 to the consolidated financial statements, the Company recognizes deferred income taxes for the effects of temporary differences between the tax basis of an asset or liability and their reported amounts in the accompanying consolidated balance sheet. These temporary differences result in taxable or deductible amounts in future years. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount that is more likely than not to be realized. As of December 31, 2020 the Company concluded it is more likely than not the Company will generate sufficient taxable income within the applicable net operating loss and tax credit carry-forward periods to realize $10.6 million of its net deferred tax assets, which resulted in a valuation allowance of $88.8 million.

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We identified the realizability of deferred tax assets as a critical audit matter due to the Company’s tax structure and the significant judgments and estimates made by management to determine that sufficient taxable income will be generated to realize a portion of deferred tax assets prior to expiration. This required a high degree of auditor judgment and an increased extent of effort when performing audit procedures to evaluate management’s estimates of taxable income prior to expiration.
The primary procedures we performed to address this critical audit matter included:
Recalculating the mathematical accuracy of management’s accounting for the previously described taxes, which included supporting calculations, schedules, and reconciliations.
Reading and evaluating management’s documentation of the accounting for income taxes, including relevant significant accounting policies, and information obtained by management from third party tax specialists which details management’s basis for the accounting and impact to the consolidated financial statements.
Obtaining and evaluating the supporting tax analyses and documentation prepared by management, as a framework and initial support for audit procedures. This includes the Company’s deferred tax calculations, which also integrates management’s analysis of valuation allowances, current tax expenses (benefits), and IRC Section 45 credits.
Consulting with internal tax specialists in evaluating management’s calculation of its provision for income taxes and that the significant judgments used were applied consistently with the tax code.
Validating the parameters employed by management in their analysis of the partial valuation allowance, in order to gain comfort with relevant positive and negative evidence available and utilized in performing the analysis.
Evaluating whether significant estimates and judgments used were consistent with past performance related to said estimates, the consistency of future forecasts and projections based on current operating conditions and future expectations, and that all were consistent with evidence obtained in procedures performed in other areas of the audit.
Accounting for Cabot Transactions
As described in Notes 2, 3, and 4 to the consolidated financial statements, on September 30, 2020, the Company entered into a supply agreement (the Supply Agreement) with Cabot Norit Americas, Inc. (Cabot) to sell and deliver certain lignite-based AC products. Concurrently with the execution of the Supply Agreement, the Company entered into an agreement to purchase (the Mine Purchase Agreement) from Cabot 100% of the membership interests in Marshall Mine, LLC for a nominal purchase price. Marshall Mine, LLC owns a lignite mine located outside of Marshall, Texas (the Marshall Mine). The Company independently determined to immediately commence activities to shutter the Marshall Mine and will incur the associated reclamation costs. In conjunction with the execution of the Supply Agreement and the Purchase Agreement, the Company entered into a reclamation contract (the Reclamation Contract) with a third party that provides a capped cost, subject to certain contingencies, in the amount of approximately $19.7 million plus an obligation to pay certain direct costs of approximately $3.6 million (collectively, the Reclamation Costs) over the estimated reclamation period of 10 years. Under the terms of the Supply Agreement, Cabot is obligated to reimburse the Company for $10.2 million of the Reclamation Costs (the Reclamation Reimbursements). In connection with the Supply Agreement, Purchase Agreement, and the Reclamation Contract, the Company assumed the obligations to reclaim and restore the land associated with the Marshall Mine. As of September 30, 2020, the Company recorded an asset retirement obligation for the total Reclamation Costs of $21.3 million. The Company also recorded a receivable for the Reclamation Reimbursements at its estimated fair value of $9.7 million. These transactions also resulted in the recording of property, plant, and equipment of $3.9 million, spare parts of $0.1 million, receivables of $0.5 million, accounts payable and accrued liabilities of $0.5 million, and upfront customer consideration of $7.6 million. The upfront customer consideration is the excess of the fair value of the liabilities assumed over assets acquired and will be amortized on a straight-line basis as a reduction to revenue over the expected 15-year contractual period of the Supply Agreement.
We identified the accounting for these agreements and contracts as a critical audit matter due to the subjective judgment required to evaluate the appropriateness of the accounting guidance followed in recording these transactions, including the conclusions surrounding the interrelatedness of the transactions and the application of Generally Accepted Accounting Principles surrounding the treatment of the upfront customer consideration.
The primary procedures we performed to address this critical audit matter included:
Evaluating management’s significant accounting policies related to the various aspects of these transactions for appropriateness, which incorporated the use of a subject matter expert on technical accounting matters.
51


Gaining an understanding of the transactions, including the business purpose and terms, by obtaining and reading the related contracts and through discussion with management.
Evaluating the estimated future cash flows for consistency with the terms laid out in the contract.
Assessment of Impairment of Long-lived Assets
As described in Note 5 to the consolidated financial statements, as part of its periodic review of the carrying value of long-lived assets, the Company assesses its long-lived assets for potential impairment. At June 30, 2020, in assessing impairment of its advanced purification technologies (APT) segment and certain other long-lived asset groups (the Asset Group), based on market conditions such as current and future years’ forecasted revenue and historically low prices of alternative power generation sources, management concluded there should be an impairment analysis of the Asset Group. Accordingly, the Company completed an undiscounted cash flow analysis of the Asset Group and estimated that the undiscounted cash flows from the Asset Group were less than the carrying value of the Asset Group. As such, the Company completed an assessment of the Asset Group’s fair value, resulting in a $26.1 million impairment and write-down of the Asset Group.
We identified the assessment and measurement of the impairment of the Asset Group as a critical audit matter due to the auditor judgment required to evaluate management’s process for assessing and quantifying the impairment. Specifically, assessing certain internally developed assumptions included the need to involve our fair value specialists. These assumptions included cash flow forecasts and revenue growth rates, estimates relating to the cost structure and operating margins, and the discount rate.
The primary procedures we performed to address this critical audit matter included:
Recalculating the mathematical accuracy of both the undiscounted cash flow analysis and the assessment of the Asset Group’s fair value.
Evaluating the Company’s estimated cash flow forecasts and long-term revenue growth rates by comparing to historical data, current market conditions, and our knowledge of the Company’s operations and the industry.
Obtaining and evaluating the fair value report used to estimate the Asset Group’s fair value which was prepared by management’s third-party valuation specialist and was evaluated and approved by the Company’s management team. This evaluation incorporated the use of the expertise of our internal fair value specialists. The work of our fair value specialists included reviews and analysis of the model and related assumptions used for the valuation of the Asset Group and the appropriateness of such modeling for the type of valuation being performed.

/s/ Moss Adams LLP


Denver, Colorado
March 12, 201810, 2021



We have served as the Company’s auditor since 2017.

52
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM




Board of Directors and Stockholders
Advanced Emissions Solutions, Inc. and Subsidiaries


We have audited the accompanying consolidated balance sheet of Advanced Emissions Solutions, Inc. and subsidiaries as of December 31, 2016, and the related consolidated statements of operations, stockholders’ equity, and cash flows for each of the two years in the period ended December 31, 2016. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.
In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Advanced Emissions Solutions, Inc. and subsidiaries as of December 31, 2016, and the results of their operations and their cash flows for each of the two years in the period ended December 31, 2016, in conformity with U.S. generally accepted accounting principles.



/s/ Hein & Associates LLP

Denver, Colorado
March 13, 2017



Advanced Emissions Solutions, Inc. and Subsidiaries
Consolidated Balance Sheets
  As of December 31,
(in thousands, except share data) 2017 2016
ASSETS    
Current assets:    
Cash and cash equivalents $30,693
 $13,208
Restricted cash 
 13,736
Receivables, net 1,113
 8,648
Receivables, related party 3,247
 1,934
Prepaid expenses and other assets 1,835
 1,382
Total current assets 36,888
 38,908
Property and equipment, net of accumulated depreciation of $1,486 and $2,920, respectively 410
 735
Equity method investments 4,351
 3,959
Deferred tax assets 38,661
 61,396
Other assets 2,308
 2,298
Total Assets $82,618
 $107,296
LIABILITIES AND STOCKHOLDERS’ EQUITY    
Current liabilities:    
Accounts payable $1,000
 $1,920
Accrued payroll and related liabilities 1,384
 2,121
Billings in excess of costs on uncompleted contracts 1,830
 4,947
Legal settlements and accruals 
 10,706
Other current liabilities 2,664
 4,017
Total current liabilities 6,878
 23,711
Legal settlements and accruals, long-term 
 5,382
Other long-term liabilities 2,285
 2,038
Total Liabilities 9,163
 31,131
Commitments and contingencies (Notes 3 and 4) 
 
Stockholders’ equity:    
Preferred stock: par value of $.001 per share, 50,000,000 shares authorized, none outstanding 
 
Common stock: par value of $.001 per share, 100,000,000 shares authorized, 22,465,821 and 22,322,022 shares issued and 20,752,055 and 22,024,675 shares outstanding at December 31, 2017 and 2016, respectively 22
 22
Treasury stock, at cost: 1,713,766 and zero shares as of December 31, 2017 and 2016, respectively (16,397) 
Additional paid-in capital 105,308
 119,494
Accumulated deficit (15,478) (43,351)
Total stockholders’ equity 73,455
 76,165
Total Liabilities and Stockholders’ Equity $82,618
 $107,296
See Notes to the Consolidated Financial Statements.

Advanced Emissions Solutions, Inc. and Subsidiaries
Consolidated Statements of Operations
  Years Ended December 31,
(in thousands, except per share data) 2017 2016 2015
Revenues:      
Equipment sales $31,401
 $46,949
 $60,099
Chemicals 4,246
 3,025
 888
Consulting services and other 45
 648
 1,752
Total revenues 35,692
 50,622
 62,739
Operating expenses:      
Equipment sales cost of revenue, exclusive of depreciation and amortization 28,438
 37,741
 45,433
Chemicals cost of revenue, exclusive of depreciation and amortization 3,434
 1,700
 601
Consulting services and other cost of revenue, exclusive of depreciation and amortization 13
 376
 1,518
Payroll and benefits 7,669
 12,390
 23,589
Rent and occupancy 795
 2,168
 3,309
Legal and professional fees 4,354
 8,293
 16,604
General and administrative 3,857
 3,721
 6,104
Research and development, net 157
 (648) 5,362
Depreciation and amortization 789
 979
 2,019
Total operating expenses 49,506
 66,720
 104,539
Operating loss (13,814) (16,098) (41,800)
Other income (expense):      
Earnings from equity method investments 53,843
 45,584
 8,921
Royalties, related party 9,672
 6,125
 10,642
Interest income 54
 268
 24
Interest expense (3,024) (5,066) (8,402)
Litigation settlement and royalty indemnity expense, net 3,269
 3,464
 
Other 2,025
 2,463
 494
Total other income 65,839
 52,838
 11,679
Income (loss) before income tax expense 52,025
 36,740
 (30,121)
Income tax expense (benefit) 24,152
 (60,938) 20
Net income (loss) $27,873
 $97,678
 $(30,141)
Earnings (loss) per common share (Note 1):      
Basic $1.30
 $4.40
 $(1.37)
Diluted $1.29
 $4.34
 $(1.37)
Weighted-average number of common shares outstanding:      
Basic 21,367
 21,931
 21,773
Diluted 21,413
 22,234
 21,773
Cash dividends declared per common share outstanding: $0.75
 $
 $
As of December 31,
(in thousands, except share data)20202019
ASSETS
Current assets:
Cash, cash equivalents and restricted cash$30,932 $12,080 
Receivables, net13,125 7,430 
Receivables, related party3,453 4,246 
Inventories, net9,882 15,460 
Prepaid expenses and other current assets4,597 7,832 
Total current assets61,989 47,048 
Restricted cash, long-term5,000 5,000 
Property, plant and equipment, net of accumulated depreciation of $3,340 and $7,444, respectively29,433 44,001 
Intangible assets, net1,964 4,169 
Equity method investments7,692 39,155 
Deferred tax assets, net10,604 14,095 
Other long-term assets, net29,989 20,331 
Total Assets$146,671 $173,799 
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable$7,849 $8,046 
Accrued payroll and related liabilities3,257 3,024 
Current portion of long-term debt18,441 23,932 
Other current liabilities12,996 4,311 
Total current liabilities42,543 39,313 
Long-term debt, net of current portion5,445 20,434 
Other long-term liabilities13,473 5,760 
Total Liabilities61,461 65,507 
Commitments and contingencies (Notes 14)00
Stockholders’ equity:
Preferred stock: par value of $.001 per share, 50,000,000 shares authorized, NaN outstanding
Common stock: par value of $.001 per share, 100,000,000 shares authorized, 23,141,284 and 22,960,157 shares issued and 18,523,138 and 18,362,624 shares outstanding at December 31, 2020 and 2019, respectively23 23 
Treasury stock, at cost: 4,618,146 and 4,597,533 shares as of December 31, 2020 and 2019, respectively(47,692)(47,533)
Additional paid-in capital100,425 98,466 
Retained earnings32,454 57,336 
Total stockholders’ equity85,210 108,292 
Total Liabilities and Stockholders’ equity$146,671 $173,799 
See Notes to the Consolidated Financial Statements.

53




Advanced Emissions Solutions, Inc. and Subsidiaries
Consolidated Statements of Operations
Years Ended December 31,
(in thousands, except per share data)20202019
Revenues:
Consumables$48,122 $53,187 
License royalties, related party13,440 16,899 
Other15 
Total revenues61,577 70,086 
Operating expenses:
Consumables cost of revenue, exclusive of depreciation and amortization45,176 49,443 
Other cost of revenue, exclusive of depreciation and amortization(563)
Payroll and benefits10,621 10,094 
Legal and professional fees5,585 9,948 
General and administrative8,228 8,123 
Depreciation, amortization, depletion and accretion8,537 7,371 
Impairment of long-lived assets26,103 
Gain on settlement(1,129)
Total operating expenses102,558 84,979 
Operating loss(40,981)(14,893)
Other income (expense):
Earnings from equity method investments30,978 69,176 
Interest expense(3,920)(7,174)
Other132 427 
Total other income27,190 62,429 
(Loss) income before income tax expense(13,791)47,536 
Income tax expense6,511 11,999 
Net (loss) income$(20,302)$35,537 
(Loss) earnings per common share (Note 1):
Basic$(1.12)$1.96 
Diluted$(1.12)$1.93 
Weighted-average number of common shares outstanding:
Basic18,044 18,154 
Diluted18,044 18,372 
See Notes to the Consolidated Financial Statements.


54


Advanced Emissions Solutions, Inc. and Subsidiaries
Consolidated Statements of Changes in Stockholders’ Equity (Deficit)

  Common Stock Treasury Stock      
(in thousands, except share data) Shares Amount Shares Amount Additional Paid-in Capital Accumulated Deficit Total Stockholders’
Equity (Deficit)
Balances, January 1, 2015 21,853,263
 $22
 
 $
 $110,169
 $(110,888) $(697)
Stock-based compensation 127,867
 
 
 
 6,462
 
 6,462
Clawback of equity awards (20,656) 
 
 
 (325) 
 (325)
Repurchase of shares to satisfy tax withholdings (16,602) 
 
 
 (277) 
 (277)
Net loss 
 
 
 
 
 (30,141) (30,141)
Balances, December 31, 2015 21,943,872
 $22
 
 $
 $116,029
 $(141,029) $(24,978)
Stock-based compensation 405,354
 
 
 
 2,762
 
 2,762
Repurchase of shares to satisfy tax withholdings (27,204) 
 
 
 (196) 
 (196)
Reclassification and settlement of equity awards 
 
 
 
 899
 
 899
Net income 
 
 
 
 
 97,678
 97,678
Balances, December 31, 2016 22,322,022
 $22
 
 $
 $119,494
 $(43,351) $76,165
Stock-based compensation 199,734
 
 
 
 2,209
 
 2,209
Repurchase of shares to satisfy tax withholdings (55,935) 
 
 
 (566) 
 (566)
Dividends declared on common stock 
 
 
 
 (15,829) 
 (15,829)
Repurchase of common shares 
 
 (1,713,766) (16,397) 
 
 (16,397)
Net income 
 
 
 
 
 27,873
 27,873
Balances, December 31, 2017 22,465,821
 $22
 (1,713,766) $(16,397) $105,308
 $(15,478) $73,455
Common StockTreasury Stock
(in thousands, except share data)SharesAmountSharesAmountAdditional Paid-in CapitalRetained Earnings/(Accumulated Deficit)Total Stockholders’
Equity
Balances, January 1, 201922,640,677 $23 (4,064,188)$(41,740)$96,750 $12,914 $67,947 
Cumulative effect of change in accounting principle (Note 7)— — — — — 27,442 27,442 
Stock-based compensation298,573 — — — 2,011 — 2,011 
Issuance of stock upon exercise of options, net50,268 — — — 156 — 156 
Repurchase of common shares to satisfy tax withholdings(29,361)— — — (451)— (451)
Cash dividends declared on common stock— — — — — (18,557)(18,557)
Repurchase of common shares— — (533,345)(5,793)— — (5,793)
Net income— — — — — 35,537 35,537 
Balances, December 31, 201922,960,157 $23 (4,597,533)$(47,533)$98,466 $57,336 $108,292 
Stock-based compensation278,910 — — — 2,496 — 2,496 
Repurchase of common shares to satisfy tax withholdings(97,783)— — — (537)— (537)
Cash dividends declared on common stock— — — — — (4,580)(4,580)
Repurchase of common shares— — (20,613)(159)— — (159)
Net loss— — — — — (20,302)(20,302)
Balances, December 31, 202023,141,284 $23 (4,618,146)$(47,692)$100,425 $32,454 $85,210 
See Notes to the Consolidated Financial Statements.



55


Advanced Emissions Solutions, Inc. and Subsidiaries
Consolidated Statements of Cash Flows

Years Ended December 31,
(in thousands)20202019
Cash flows from operating activities
Net (loss) income$(20,302)$35,537 
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Deferred income tax expense3,491 8,655 
Depreciation, amortization, depletion and accretion8,537 7,371 
Amortization of debt discount and debt issuance costs1,418 1,678 
Operating lease expense3,559 3,192 
Impairment of long-lived assets26,103 
Gain on settlement(1,129)
Recovery of accounts receivable and other receivables(990)
Stock-based compensation expense2,496 2,011 
Earnings from equity method investments(30,978)(69,176)
Other non-cash items, net192 638 
Changes in operating assets and liabilities, net of effects of acquired businesses:
Receivables, net(2,541)2,124 
Related party receivables794 37 
Prepaid expenses and other current assets3,234 (2,200)
Inventories, net4,748 5,505 
Other long-term assets, net(1,005)(262)
Accounts payable(196)2,218 
Accrued payroll and related liabilities233 (5,255)
Other current liabilities(520)(261)
Operating lease liabilities(2,200)(3,180)
Other long-term liabilities(2,916)(258)
Distributions from equity method investees, return on investment62,441 73,888 
Net cash provided by operating activities54,469 62,262 
56


  Years Ended December 31,
(in thousands) 2017 2016 2015
Cash flows from operating activities      
Net income (loss) $27,873
 $97,678
 $(30,141)
Adjustments to reconcile net income (loss) to net cash used in operating activities:      
Deferred tax benefit from release of valuation allowance (474) (61,396) 
Depreciation and amortization 789
 979
 2,019
Debt prepayment penalty and amortization of debt issuance costs 109
 1,380
 987
Impairment of property, equipment, inventory, intangibles and cost method investment 464
 2,280
 2,087
Provision for accounts receivable and other receivables 385
 13
 633
Interest costs added to principal balance of notes payable 
 
 923
Share-based compensation expense, net 2,209
 2,868
 6,879
Earnings from equity method investments (53,843) (45,584) (8,921)
Gain on sale of equity method investment 
 (2,078) 
Gain on settlement of note payable, licensed technology, and sales-type lease 
 (1,910) 
Other non-cash items, net 44
 35
 285
Changes in operating assets and liabilities, net of effects of acquired businesses:      
Receivables 6,743
 (301) 8,361
Related party receivables (1,313) (16) (479)
Prepaid expenses and other assets (351) 1,195
 (107)
Costs incurred on uncompleted contracts 27,048
 29,623
 6,492
Deferred tax asset, net 23,208
 
 
Other long-term assets 41
 961
 205
Accounts payable (920) (4,254) (1,340)
Accrued payroll and related liabilities (738) (2,887) (102)
Other current liabilities (1,586) (3,105) (812)
Billings on uncompleted contracts (30,140) (32,272) (15,186)
Advance deposit, related party 
 (2,980) (3,544)
Other long-term liabilities 154
 (2,175) 595
Legal settlements and accruals (16,088) (4,211) (3,722)
Distributions from equity method investees, return on investment 4,638
 7,900
 5,019
Net cash used in operating activities (11,748) (18,257) (29,869)

  Years Ended December 31,
(in thousands) 2017 2016 2015
Cash flows from investing activities      
Distributions from equity method investees in excess of cumulative earnings 48,875
 38,250
 8,651
Maturity of investment securities, restricted 
 336
 
Acquisition of property and equipment (485) (289) (507)
Proceeds from sale of property and equipment 57
 52
 942
Advance on note receivable 
 
 (500)
Acquisition of business 
 
 (2,124)
Purchase of and contributions to equity method investee (61) (223) (2,128)
Proceeds from sale of equity method investment 
 1,773
 
Net cash provided by investing activities 48,386
 39,899
 4,334
Cash flows from financing activities      
Borrowings on Line of Credit 808
 
 
Repayments on Line of Credit (808) 
 
Short-term borrowings 
 
 13,539
Repayments on short-term borrowings and notes payable, related party 
 (14,496) (3,234)
Short-term borrowing loan costs and debt prepayment penalty (236) (979) 
Repurchase of shares to satisfy tax withholdings (566) (196) (276)
Dividends paid (15,690) 
 
Repurchase of common shares (16,397) 
 
Net cash (used in) provided by financing activities (32,889) (15,671) 10,029
Increase (Decrease) in Cash and Cash Equivalents and Restricted Cash 3,749
 5,971
 (15,506)
Cash and Cash Equivalents and Restricted Cash, beginning of year 26,944
 20,973
 36,479
Cash and Cash Equivalents and Restricted Cash, end of year $30,693
 $26,944
 $20,973
Supplemental disclosure of cash flow information:      
Cash paid for interest $3,644
 $3,647
 $6,274
Cash paid for income taxes, net of refunds received $1,672
 $541
 $29
Supplemental disclosure of non-cash investing and financing activities:      
Settlement of RCM6 note payable $
 $13,234
 $
Non-cash reduction of equity method investment $
 $11,156
 $
Stock award reclassification (liability to equity) $
 $899
 $
Dividends payable $139
 $
 $
Years Ended December 31,
(in thousands)20202019
Cash flows from investing activities
Acquisition of property, plant, equipment, and intangible assets, net(6,685)(7,851)
Mine development costs(1,202)(4,726)
Acquisition of business, net of cash acquired(661)
Net cash used in investing activities(7,887)(13,238)
Cash flows from financing activities
Principal payments on term loan(24,000)(30,000)
Borrowings from Paycheck Protection Program Loan3,305 
Dividends paid(4,979)(18,274)
Principal payments on finance lease obligations(1,360)(1,354)
Repurchase of shares to satisfy tax withholdings(537)(451)
Repurchase of common shares(159)(5,793)
Other156 
Net cash used in financing activities(27,730)(55,716)
Increase (decrease) in Cash, Cash Equivalents and Restricted Cash18,852 (6,692)
Cash, Cash Equivalents and Restricted Cash, beginning of year17,080 23,772 
Cash, Cash Equivalents and Restricted Cash, end of year$35,932 $17,080 
Supplemental disclosure of cash flow information:
Cash paid for interest$2,489 $5,650 
Cash (received) paid for income taxes$(84)$4,308 
Supplemental disclosure of non-cash investing and financing activities:
Acquisition of property, plant and equipment under finance lease$158 $
Dividends payable$32 $284 
See Notes to the Consolidated Financial Statements.
57


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements




Note 1 - Summary of Operations and Significant Accounting Policies
Nature of Operations
Advanced Emissions Solutions, Inc. ("ADES" or the "Company") is a Delaware corporation with its principal office located in Highlands Ranch, Colorado.Greenwood Village, Colorado and operations located in Louisiana. The Company is principally engaged in emissions controlthe sale of consumable air and water treatment options including activated carbon ("EC"AC") and chemical technologies. The Company's proprietary technologies and associated equipment, consumables and services. Our proprietary environmentalin the advanced purification technologies ("APT") market enable customers to reduce emissions ofair and water containments, including mercury and other pollutants, to maximize utilization levels and improve operating efficiencies to meet the challenges of existing and pending ECemission control regulations. TheThrough its wholly-owned subsidiary, ADA Carbon Solutions, LLC ("Carbon Solutions"), which the Company acquired on December 7, 2018 (the "Carbon Solutions Acquisition"), the Company manufactures and sells AC used to capture and remove contaminants for coal-fired power plants, industrial and water treatment markets. Carbon Solutions also owns an associated lignite mine ("Five Forks Mine") that supplies the primary raw material for manufacturing AC.
Through its equity ownership in Tinuum Group, LLC ("Tinuum Group") and Tinuum Services, LLC ("Tinuum Services"), both of which are unconsolidated entities, the Company generates substantial earningsearnings. Tinuum Group provides reduction of mercury and nitrogen oxide ("NOx") emissions at select coal-fired power generators through the production and sale of refined coal ("RC") that qualifies for tax credits under Section 45 ("Section 45 tax credits") of the Internal Revenue Code ("IRC") from its equity investments in certain entities and royalty payment streams related toSection 45 - Production Tax Credit ("Section 45 tax credits"). The Company also earns royalties for technologies that are licensed to Tinuum Group LLC, a Colorado limited liability company ("Tinuum Group"). Such technologies allow Tinuum Group to provide their customers with various solutionsand used at certain RC facilities to enhance combustion and reduced emissions of nitrogen oxide ("NOx")NOx and mercury from coal burned to generate electrical power. The Company’s sales occur principally throughoutTinuum Services operates and maintains the United States. See Note 13 for additional information regardingRC facilities under operating and maintenance agreements with Tinuum Group and owners or lessees of the Company's operating segments.RC facilities. Both Tinuum Group and Tinuum Services expect to significantly wind down their operations by the end of 2021 due to the expected expiration of the Section 45 tax credit period as of December 31, 2021.
Principles of Consolidation
The Consolidated Financial Statements include accounts of wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
All investments in partially owned entities for which the Company has greater-than-20%greater than 20% ownership are accounted for using the equity method based on the legal form of the Company's ownership percentage and the applicable ownership percentage of the entity and are included in the Equity method investments line item in the Consolidated Balance Sheets. As of December 31, 2017,2020, the Company holds equity interests of 42.5%, 50.0% and 50.0% in Tinuum Group and Tinuum Services, LLC ("Tinuum Services") and GWN Manager, LLC ("GWN Manager"), respectively. As discussed in Note 2, the Company purchased its interest in GWN Manager in July 2017 and sold its equity method investment in RCM6, LLC ("RCM6") in March 2016. Tinuum Group is deemed to be variable interest entity ("VIE") under the VIE model of consolidation, but the Company does not consolidate Tinuum Group as it is not deemed to be its primary beneficiary.
Cash, cash equivalents and Cash Equivalentsrestricted cash
Cash and cash equivalents include bank deposits and other highly liquid investments purchased with an original maturity of three months or less.
Restricted Cash
As of December 31, 2017, all cash and cash equivalents were unrestricted and all cash requirements for contractual performance guarantees and payments were satisfied under the borrowing availability of the 2013 Loan and Security Agreement ("Line of Credit"). As of December 31, 2016, restricted cash primarily consistedconsists of funds withheld to provide collateral support for certain letters of credit issued to i) customers related to certain contractual performance and payment guarantees, ii) certain settlement parties to provide security for continuing royalty indemnification payments related to the settlement of certain litigation (the "Royalty Award"), and iii) minimum cash balance requirements under the LineTerm Loan and Security Agreement (the "Senior Term Loan") and a surety bond indemnification agreement (the "Surety Agreement") associated with reclamation of Credit.a mine. Restricted cash is classified consistent with the underlying obligation.
Receivables, net
Receivables, net are recorded at net realizable value. This carrying value includes an appropriate allowance for estimated uncollectible amounts to reflect any loss anticipated on the receivables balances. Increases and Credit Policies
Receivable balances represent unsecured, customer obligations due under trade terms typically requiring payment within 30-45 days fromdecreases in the invoice date and are stated net of allowance for doubtful accounts.accounts are established based upon changes in the credit quality of receivables and are included as a component of the General and administrative line item in the Consolidated Statements of Operations. The Company records allowancesallowance for doubtful accounts when it is probable thatbased on historical experience, general economic conditions and the accounts receivable balances will not be collected. The following tables showcredit quality of specific accounts.
Inventories, net
Inventories, net are stated at the receivables balances:
  As of December 31,
(in thousands) 2017 2016
Trade receivables $1,240
 $4,289
Less: Allowance for doubtful accounts (127) (200)
Trade receivables, net 1,113
 4,089
Other receivables (1)
 
 4,559
Total $1,113
 $8,648
(1) Aslower of December 31, 2016, Other receivables included settlement amounts subsequently funded byaverage cost or net realizable value and consist principally of raw materials and finished goods related to the Company's insurance carriers for legal proceedings described in Note 4.AC and chemical product offerings. The cost of inventory is determined using the average cost method.
58


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


During the years ended December 31, 2017, 2016Inventories are periodically reviewed for both potential obsolescence and 2015,potential declines in anticipated selling prices. In this review, the Company recognized zero, zeromakes assumptions about the future demand for and $0.1 million, respectively,market value of bad debt expense related to the write-off of specific accounts whose ultimate collection was in doubt. Bad debt expense is included within the Generalinventory, and administrative line item in the Consolidated Statements of Operations.
Notes receivable are reported at their outstanding principal balances, adjusted for any amounts determined to be uncollectible. As of December 31, 2017 and 2016, the Company had a Note Receivable outstanding inestimates the amount of $1.0 million, which is fully reserved as substantial doubt exists asany obsolete, unmarketable, slow moving or overvalued inventory. The Company will write down the value of inventories by an amount equal to collectability.the difference between the cost of the inventory and its estimated net realizable value.
Interest income is accrued and credited to income based on the unpaid principal balance outstanding. The accrual of interest is discontinued when substantial doubt exists about the ability to collect principal and interest based upon the contractual terms. Current portion of notes receivable is included within Prepaid expenses and other assets and long-term portion is included in the Other assets line item in the Consolidated Balance Sheets. Additional details regarding Note receivableInventory balances are included in Note 10.9.
Inventory
Inventories are stated at the lower of cost or market and consist principally of finished goods related to the Company's chemical product offerings. The cost of inventory is determined using the first-in-first-out ("FIFO") method. Inventories are included within the Other assets line item in the Consolidated Balance Sheets. As of December 31, 2017 and 2016, the balance of inventory was comprised of finished goods of $0.1 million and zero, respectively.
Other Intangible Assets
Other Intangible assets consist of patents, and licensed technology, customer relationships, developed technologies and are included in the Other assets line item in the Consolidated Balance Sheets.trade names.
The Company has developed technologies resulting in patents being granted by the U.S. Patent and Trademark Office.Office or other regulatory offices. Legal costs associated with securing the patent are capitalized and amortized over the legal or useful life beginning on the patent filing date. The weighted-averageremaining intangible assets were recorded at fair value in connection with the Carbon Solutions Acquisition.
The following table details the components of the Company's intangible assets:
As of December 31,
20202019
(in thousands, except years)Weighted average amortization (in years)Initial Cost (1)Net of Accumulated AmortizationInitial CostNet of Accumulated Amortization
Customer relationships5$835 $713 $2,200 $1,731 
Patents91,306 733 1,489 1,039 
Developed technology5607 518 1,600 1,259 
Trade name236 300 140 
Total$2,784 $1,964 $5,589 $4,169 
(1) As of December 31, 2020, initial costs were inclusive of the write down of intangibles to fair value based on the impairment charge taken during the year ended December 31, 2020 and further described in Note 5.
Included in the Consolidated Statements of Operations is amortization periodexpense related to intangible assets of $1.0 million and $1.0 million for the Company's patentsyears ended December 31, 2020 and 2019, respectively. The estimated future amortization expense for existing intangible assets as of December 31, 2020 is 16expected to be $0.3 million for each of the five succeeding fiscal years.
All research and development costs associated with the technology development are expensed as incurred.
Investments
The investments in entities in which the Company does not have a controlling interest (financial or operating), but where it has the ability to exercise significant influence over operating and financial policies, are accounted for using the equity method of accounting. Whether or not the Company exercises significant influence with respect to an investee depends on an evaluation of several factors including, among others, representation on the investee company’s board of directors and the Company's ownership level. Under the equity method of accounting, an investee company’s accounts are not reflected withinin the Company’s Consolidated Balance Sheets and Consolidated Statements of Operations; however, the Company’s share of the earnings or losses of the investee company is reported in the Earnings from equity method investments line item in the Consolidated Statements of Operations, and the Company’s carrying value in an equity method investee company is reported in the Equity method investments line in the Consolidated Balance Sheets.
When the Company receives distributions in excess of the carrying value of the investment and has not guaranteed any obligations of the investee norand/or is itnot required to provide additional funding to the investee, the Company recognizes such excess distributions as equity method earnings in the period the distributions occur. When the investee subsequently reports income, the Company does not record its share of such income until it equals the amount of distributions in excess of carrying value that were previously recognized in income. During the years ended December 31, 2017, 20162020 and 2015,2019, the Company had no guarantees or requirements to provide additional funding to investees.
Additionally, when the Company's carrying value in an equity method investment is zero, and the Company has not guaranteed any obligations of the investee norand/or is itnot required to provide additional funding to the investee, the Company will not recognize its share of any reported losses by the investee until future earnings are generated to offset previously unrecognized
59


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

losses. As a result, equity income or loss reported onin the Company's Consolidated Statements of Operations for certain equity method investees may differ from a mathematical calculation of net income or loss attributable to its equity interest based uponon the percentage ownership of the Company's equity interest and the net income or loss attributable to equity owners as shown onin the investee company's statements of operations. Likewise, distributions from equity method investees are reported onin the Consolidated Statements of Cash Flows as “return on investment” withinin Operating cash flows until such time as the carrying value in an equity method investee company is reduced to zero; thereafter, such distributions are reported as “distributions"distributions in excess of cumulative earnings” withinearnings" in Investing cash flows. See Note 27 for additional information regarding the Company's equity method investments.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Investments in partially-owned subsidiaries for which the Company has less-than-20% ownership are accounted for usingin accordance with accounting guidance applicable to equity investments that do not qualify for the cost method. Costequity method of accounting. The Company evaluates these types of investments are evaluated for impairment upon an indicator of impairment such as an event orchanges in fair value and, if there is change, recognizes the change in circumstances that may have a significant adverse effect on the fair valueConsolidated Statement of the investment.Operations. If no such events or changes in circumstances have occurred related to these types of investments, the fair value is estimated only if practicable to do so.
Royalties, Related Party

The Company licenses its M-45TM and M-45-PCTM emission control technologies ("M-45 License") to Tinuum Group and realizes royalty income based upon a percentage of the per-ton, pre-tax margin as defined in the M-45 License.
Property, Plant and Equipment
Property, plant and equipment is stated at cost less accumulated depreciation and includes leasehold improvements. Depreciation on assets is computed using the straight-line method over the lesser of the estimated useful lives of the related assets or the lease term (ranging from 21 to 731 years). Maintenance and repairs that do not extend the useful life of the respective asset are charged to Operating expenses as incurred. When assets are retired, or otherwise disposed of, the property accounts are relieved of costs and accumulated depreciation and any resulting gain or loss is credited or charged to income. The Company performs an evaluation of the recoverability of the carrying value of its long-lived assetsproperty, plant and equipment to determine if facts and circumstances indicate that thetheir carrying value of assets may be impairedimpaired. Impairment charges are recorded to Operating expenses in the Consolidated Statements of Operations. Amortization of finance leased assets is included in depreciation expense and if any adjustment is warranted.calculated using the straight-line method over the term of the lease.
Revenue RecognitionLeases
The Company recognizes revenues when: (i) persuasive evidencerecords a right of use ("ROU") asset and related liability under a contract or part of a customer arrangement exists; (ii)contract when it conveys the price is fixed or determinable; (iii) collectability is reasonable assured;right to control the use of an identified asset for a period of time in exchange for consideration. Control over the use of an identified asset means that an entity has both the right to obtain substantially all of the economic benefits from the use of an identified asset and (iv) product delivery has occurred or services have been renderedthe right to direct the use of that identified asset. The determination of whether a contract contains a lease may require significant assumptions and it is probable that performance guarantees, if any, will be met.judgments.
Equipment sales
The Company has entered into construction-type contracts that entail the design and constructionFor all classes of emissions control systems ("extended equipment contracts"). Revenues from such extended equipment contracts are recorded using the percentage of completion cost to cost method based on costs incurred to date compared with total estimated contract costs. However, ifunderlying assets, the Company does not separate nonlease components from lease components and accounts for each separate lease component and the nonlease components associated with that lease component as a single lease component. The Company records lease liabilities and related ROU assets for all leases that have sufficient information to estimate either costs incurred or total estimated costs for extended equipment contracts at the time contracts are entered into, the completed contract method is used.a term of greater than one year. For allshort-term leases (leases with terms of its Dry Sorbent Injection ("DSI") contracts,less than one year), the Company has usedexpenses lease payments on a straight-line basis over the completed contract method from inceptionlease term.
Variable lease payments represent payments made by a lessee for the right to use an underlying asset that vary because of changes in facts or circumstances occurring after the commencement date of a lease other than the passage of time. Variable lease payments that are based on an index or rate, calculated by using the index or rate that exists on the lease commencement date, are included in the measurement of a lease liability. Certain of the contract to recognize revenuesCompany’s operating leases for office facilities contain variable lease components that are not based on an index or rate, and related cost of revenue.the Company recognizes these payments as lease expense in the period in which the obligation for those payments is incurred.
Under the completed contract method, revenues and costs from extended equipment contracts are deferred and recognized when contract obligations are substantially complete. The Company defines substantially complete as deliverycalculates lease liabilities based on the present value of equipmentlease payments discounted by the rate implicit in the lease or, if not readily determinable, the Company’s incremental borrowing rate.
Finance lease liabilities are subsequently measured by increasing the carrying amount to reflect interest expense on the finance lease liability and start-up atreducing the customer site or, as applicable to DSI systems, the completion of any major warranty service period. For eachcarrying amount of the years ended December 31, 2017, 2016lease liability to reflect lease payments made during the period. Interest on finance lease liabilities is determined in each period during the lease term as the amount that produces a constant periodic discount rate on the remaining balance of the lease liability. ROU assets under finance leases are amortized over the remaining lease term on a straight-line basis. Interest expense related to finance lease liabilities and 2015, the Company did not have sufficient information to measure ongoing performance for its extended equipment contracts. Accordingly, the completed contract methodamortization of revenue recognition has been used for each of these years,ROU assets under finance leases are included in Interest expense and revenuesDepreciation, amortization, depletion and costs are deferred until the equipment is placed into service and contract obligations are substantially complete. For the years ended December 31, 2017 and 2016, the Company did not enter into any extended equipment contracts.
Deferred revenue and related costs are accumulated in the Costs in excess of billings on uncompleted contracts or Billings in excess of costs on uncompleted contracts line itemsaccretion, respectively, in the Consolidated Balance Sheets, and typically include direct materials, direct labor and subcontractor costs, and indirect costs related to contract performance, such as indirect labor, supplies, tools and repairs.Statement of Operations.
When multiple contracts exist with a single counterparty, the Company evaluates revenue recognition on a contract-by-contract basis. Provisions for estimated losses on uncompleted contracts are recognized when it has been determined that a loss is probable.
60

The Company also enters into other non-extended equipment contracts for which the Company recognizes revenues as services to build equipment systems are performed or as equipment is delivered.

Chemicals
Revenues for direct sales of chemicals are recognized at the date of delivery to, and acceptance by, the customer.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


Certain chemicals customer contractsOperating lease liabilities are comprised of evaluation testssubsequently measured at the present value of the Company's chemicals' effectivenesslease payments not yet paid discounted using the discount rate for the lease established at the inception date of the lease. ROU assets under operating leases are subsequently measured at the amounts of the related operating lease liability, adjusted for, as applicable, prepaid or accrued lease payments, the remaining balance of any lease incentives received, unamortized initial direct costs and efficiencyimpairment. Lease expense from operating leases is recognized as a single lease cost over the remaining lease term on a straight-line basis. Variable lease payments not included in reducing emissionsoperating lease liabilities are recognized as expense in the period in which the obligation for those payments is incurred. Lease expense from operating leases is included in the "General and entailadministrative" line in the deliveryConsolidated Statement of chemicalsOperations.
Other Assets
Mine Development Costs
Mine development costs are related to the customerFive Forks Mine and the Company evaluating results of emissions reduction over the term of the contract. The Company generally recognizes revenue from these types of contracts over the duration of the contract based onare stated at cost less accumulated depletion and include acquisition costs, the cost of chemicals consumed byother development work and mitigation costs. Costs are amortized over the customer.estimated life of the related mine reserves, which is 16 years. The Company performs an evaluation of the recoverability of the carrying value of mine development costs to determine if facts and circumstances indicate that their carrying value may be impaired and if any adjustment is warranted. Mine development costs are reported in the "Other long-term assets, net" line item in the Consolidated Balance Sheet.
Consulting servicesSpare Parts
Spare parts include critical spares required to support plant operations. Parts and othersupply costs are determined using the lower of cost or estimated replacement cost. Parts are recorded as maintenance expenses in the period in which they are consumed. Spare parts are reported in the "Other long-term assets, net" line item in the Consolidated Balance Sheet.
Revenue Recognition
The Company recognizes revenue from a contract with a customer when a performance obligation under the terms of a contract with a customer is satisfied, which is when the customer controls the promised goods or services that are transferred in satisfaction of the performance obligation. Revenue is measured as the amount of consideration that is expected to be received in exchange for transferring goods or providing services, and the transaction price is generally fixed and generally does not contain variable or noncash consideration. In addition, the Company’s contracts with customers generally do not contain customer refund or return provisions or other similar obligations. Transfer of control and satisfaction of performance obligations are further discussed in each of the revenue components listed below.
The Company uses estimates and judgments in determining the nature and timing of satisfaction of performance obligations, the standalone selling price ("SSP") of performance obligations and the allocation of the transaction price to multiple performance obligations, if any.
The Company’s revenue components are Consumables sales and License royalties.
Consumables
The Company is principally engaged in the sale of consumable products that utilize activated carbon ("AC") and chemical based technologies to a broad range of customers, including coal-fired utilities, water treatment plants, and other diverse markets. Our proprietary technologies and associated product offerings provide purification solutions to enable our customers to reduce certain contaminants and pollutants and thus maximize utilization levels and improve operating efficiencies to meet the challenges of existing and potential regulations.
Generally, customer contracts for consumables are short duration and performance obligations generally do not extend beyond one year.
License royalties, related party
The Company generates revenues from royalties ("M-45 Royalties") earned under a licensing arrangement ("M-45 License") of its M-45TM and M-45-PCTM emissions control technologies ("M-45 Technology") between the Company and Tinuum Group. The Company recognizes M-45 Royalties at a point in time based on timethe use of the M-45 Technology at certain RC facilities or through Tinuum Group’s use of licensed technology for rates in excess of amounts allowed for RC application. The amount of M-45 Royalties recognized is generally based on a percentage of pre-tax margins (as defined in the M-45 License) of the RC facilities using the M-45 Technology.
61


Advanced Emissions Solutions, Inc. and materialSubsidiaries
Notes to Consolidated Financial Statements

Practical Expedients and Exemptions
The Company does not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.
Sales and other taxes that are collected concurrently with revenue-producing activities are excluded from revenue.
The Company accounts for freight costs as servicesactivities to fulfill the promise to transfer the goods, and therefore these activities are performed.also not assessed as a separate service to customers.
The Company accounts for all shipping and handling activities that occur after control of the related good transfers as fulfillment activities. These activities are included in Cost of Revenue line items om the Consolidated Statement of Operations.
CostsThe Company generally expenses sales commissions when incurred because the amortization period of the asset that the Company would have recognized is one year or less. These costs are recorded in sales and marketing expenses in the Depreciation, amortization, depletion and accretion line item on the Consolidated Statement of Operations.
Cost of Revenue
Cost of revenue includeincludes all labor, fringe benefits, subcontract labor, chemicaladditive and coal costs, materials, equipment, supplies, travel costs and any other costs and expenses directly related to the Company’s production of revenues. The Company records estimated contract losses, if any, in the period they are determined.
Warranty costs for Activated Carbon Injection ("ACI") equipment systems are estimated based on historical experience and are recorded as a percentage of revenue when the equipment is substantially complete. Warranty costs, comprised of the cost of replacement materials and direct labor, are included within the Equipment sales cost of revenue line in the Consolidated Statements of Operations.
Warranty costs for DSI equipment systems have not been estimable at the time the contracts were entered into, as the Company lacked historical experience in manufacturing DSI systems and was unable to reasonably estimate costs to complete as well as warranty claims. Therefore, revenue recognition on DSI equipment systems has been deferred until the end of the warranty period, which has generally been 12 to 24 months following substantial completion.
As warranty claims are incurred, such costs are deferred within the Costs in excess of billings on uncompleted contracts line item in the Consolidated Balance Sheets, until such time that revenues and cost of revenue are recognized. Subsequent to revenues being recognized, warranty claims are included within the Other long-term liabilities line item in the Consolidated Balance Sheets and within Cost of revenue line of the Consolidated Statements of Operations. The changes in the carrying amount of the Company’s warranty obligations, which do not include amounts for DSI systems as revenues, are deferred until the end of the warranty period, and are disclosed in Note 10.
Payroll and Benefits
Payroll and benefits costs include direct payroll, personnel related fringe benefits, sales and administrative staff labor costs and stock compensation expense. Payroll and benefits costs exclude direct labor included in Cost of revenue.
Rent and Occupancy
Rent and occupancy costs include rent, insurance and other occupancy-related expenses.
Legal and Professional
Legal and professional costs include external legal, audit and consulting expenses.
General and Administrative
General and administrative costs include director fees and expenses, rent, insurance and occupancy-related expenses, bad debt expense, impairments and other general costs of conducting business.
Research and Development Costs
Research and development costs are charged to expense in the period incurred.
Researchincurred and development expense consists of research relating to continued product development for the Company's ongoing business and various other projects including the CO2 capture and control market. The Company historically entered into development and cost-sharing contracts with the U.S. Department of Energy (the "DOE"). These contracts were best-effort-basis contracts, and the Company generally included industry cost-share partners to offset the costs incurred that are anticipated to be in excess of funded amounts from the DOE. The Company accounts for these contracts with the DOE and industry cost-share partners by recognizing amounts funded by the DOE under research-and-development-cost-sharing arrangements as an offset to research and development expense, which is reported in the ResearchGeneral and development, netadministrative line item in the Consolidated Statements of Operations. During the years ended December 31, 2020 and 2019, the Company recorded research and development costs of $1.0 million and $0.2 million, respectively.
Asset Retirement Obligations
Asset retirement obligations ("ARO") are comprised of mine reclamation activities required under operating agreements related to the Five Forks Mine and the Marshall Mine (as defined in Note 3) and are recognized when incurred and recorded as liabilities at fair value. An ARO is accreted over time through periodic charges to earnings. Accounting for reclamation and remediation obligations requires the Company to make estimates of future costs unique to a specific mining operation that the Company expects to incur to complete the reclamation and remediation work required to comply with existing laws and regulations. AROs are periodically adjusted to reflect changes in the estimated present value resulting from the passage of time and revisions to the estimates of either the timing or amount of the reclamation costs.
Five Forks Mine
For the Five Forks Mine ARO, a corresponding ARO asset is depreciated over its estimated life. Reclamation costs related to the Five Forks Mine are allocated to expense over the life of the related mine assets, and are periodically adjusted to reflect changes in the estimated present value resulting from the passage of time and revisions to the estimates of either the timing or amount of the reclamation costs. Remediation costs for the Five Forks Mine are accrued based on management’s best estimate at the end of each period of the costs expected to be incurred. Such cost estimates may include ongoing care, maintenance and monitoring costs. Reclamation obligations are based on the timing of estimated spending for an existing environmental disturbance. On an annual basis, unless otherwise deemed necessary, the Company reviews its estimates and assumptions of the Five Forks Mine ARO.
62


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


Asset Retirement Obligations
Asset retirement obligations, or "ARO liabilities," consistThe Company’s mining activities at the Five Forks Mine are subject to various domestic laws and regulations governing the protection of estimated costs to remove equipment and reclaim the land associated with one research and development project.environment. The Company estimates ARO liabilitiesconducts its mining activities to protect public health and the environment and believes its operations are in compliance with applicable laws and regulations in all material respects. The Company has made, and expects to make in the future, expenditures to comply with such laws and regulations, but cannot predict the full amount of such future expenditures. Estimated future reclamation costs are based principally on current legal and regulatory requirements.
Marshall Mine (refer to Note 3)
Reclamation costs related to the Marshall Mine are largely based on a capped fee structure, based on the initial estimate of the total costs of reclamation, which provides for finalcertain contingencies that could increase or decrease the reclamation fee based upon bids obtained from independent third partieson the reclamation agreement executed between the Company and other exit alternatives, which are adjustedthe Marshall Mine operator. The timing of payments may vary and the Company accounts for inflation and then discounted at a credit-adjusted risk-free rate. Changesthese timing differences in estimates could occur due to revisions of estimated costs andvaluing the reclamation as well as changes in timing and performance of theactual reclamation activities. ARO liabilities are included within the Other long-term liabilities line item in the Consolidated Balance Sheets and discussed further in Note 10. As of December 31, 2017 and December 31, 2016, the ARO liability was zero and $1.3 million, respectively.costs on a quarterly basis.
Income Taxes
The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined on the basis of the differences between the financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in operations in the period that includes the enactment date.    
The Company recognizes deferred tax assets and liabilities and maintains valuation allowances where it is more likely than not that all or a portion of deferred tax assets will not be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations.    
The Company records uncertain tax positions on the basis of a two-step process whereby (1) the Company determines whether it is more-likely-than-not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.

The Company records interest expense due to the Company's share of Tinuum Group's equity method earnings for Refined Coal ("RC") facilities, in which the sale of an RC facility or lease income or sale isgenerated from an RC facility are treated as installment sales for federal income tax purposes. IRS section 453A requires taxpayers using the installment method to pay an interest charge on the portion of the tax liability that is deferred under the installment method. The Company recognizes IRS section 453A interest ("453A interest") and other interest and penalties related to unrecognized tax benefits in the Interest expense line item in the Consolidated Statements of Operations.
Stock-Based Compensation
Stock-based compensation expense is measured at the grant date based on the estimated fair value of the stock-based award and is generally expensed on a straight-line basis over the requisite service period and/or performance period of the award. Forfeitures are recognized when incurred. These costs are recordedStock-based compensation expense related to manufacturing employees and administrative employees is included in the Consumables, Cost of revenues and Payroll and benefits orline items, respectively, on the Consolidated Statement of Operations. Stock-based compensation expense related to non-employee directors and consultants is included in the General and administrative for director related expense, line itemsitem in the Consolidated StatementsStatement of Operations.
Dividends
When a sufficient amount of available earnings exists at the time of a dividend declaration, dividends are charged to Retained earnings when declared. If a sufficient amount of available earnings is not available, dividends declared are charged as a reduction to Additional paid-in capital.
Earnings (Loss) Per Share
Basic earnings (loss) per share is computed using the two-class method, which is an earnings allocation formula that determines earnings (loss) per share for common stock and any participating securities according to dividend and participating rights in undistributed earnings. The Company's restricted stock awards ("RSA's") granted prior to December 31, 2016 contain non-forfeitablenon-
63


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

forfeitable rights to dividends or dividend equivalents and are deemed to be participating securities.securities ("Participating Securities"). RSA's granted subsequent to December 31, 2016 do not contain non-forfeitable rights to dividends and are not deemed to be participating securities.
Under the two-class method, net income (loss) for the period is allocated between common stockholders and the holders of the participating securities based on the weighted-average of common shares outstanding during the period, excluding participating, unvested RSA's ("common shares"), and the weighted-average number of participating, unvested RSA's outstanding during the period, respectively. The allocated, undistributed income for the period is then divided by the weighted-average number of common shares and participating, unvested RSA's outstanding during the period to determine basic earnings per common share and participating security for the period, respectively. Pursuant to accounting principles generally accepted in the United States ("U.S. GAAP"),Participating Securities. As permitted, the Company has elected not to separately present basic or diluted earnings per share attributable to participating securitiesParticipating Securities in the Consolidated StatementsStatement of Operations.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Diluted earnings per share is computed in a manner consistent with that of basic earnings per share, while considering other potentially dilutive securities. Potentially dilutive securities consist of both unvested, participatingParticipating Securities and non-participating RSA's, as well as outstanding options to purchase common stock ("Stock Options") and contingent performance stock units ("PSU's") (collectively, "Potential dilutive shares"). The dilutive effect, if any, for non-participating RSA's, Stock Options and PSU's is determined using the greater of dilution as calculated under the treasury stock method or the two-class method. Potential dilutive shares are excluded from diluted earnings (loss) per share when their effect is anti-dilutive. When there is a net loss for a period, all Potential dilutive shares are anti-dilutive and are excluded from the calculation of diluted loss per share for that period.
Each PSU represents a contingent right to receive shares of the Company’s common stock, and the number of shares may range from zero to two times the number of PSU's granted on the award date depending upon the price performance of the Company's common stock as measured against a general index and a specific peer group index over requisite performance periods. The number of Potential dilutive shares related to PSU's is based on the number of shares of the Company's common stock, if any, that would be issuable at the end of the respective reporting period, assuming that the end of the reporting period is the end of the contingency period applicable to such PSU's. See Note 616 for additional information related to PSU's.
The following table sets forth the calculations of basic and diluted earnings (loss) per common share:
 Years Ended December 31, Years Ended December 31,
(in thousands, except per share amounts) 2017 2016 2015(in thousands, except per share amounts)20202019
Net income (loss) $27,873
 $97,678
 $(30,141)
Less: Dividends and undistributed income (loss) allocated to participating securities 171
 1,105
 (275)
Income (loss) attributable to common stockholders $27,702
 $96,573
 $(29,866)
Net (loss) incomeNet (loss) income$(20,302)$35,537 
Less: Dividends and undistributed income allocated to Participating SecuritiesLess: Dividends and undistributed income allocated to Participating Securities(5)44 
(Loss) income attributable to common stockholders(Loss) income attributable to common stockholders$(20,297)$35,493 

 

 

 

Basic weighted-average number of common shares outstanding 21,367
 21,931
 21,773
Basic weighted-average number of common shares outstanding18,044 18,154 
Add: dilutive effect of equity instruments 46
 303
 
Add: dilutive effect of equity instruments218 
Diluted weighted-average shares outstanding 21,413
 22,234
 21,773
Diluted weighted-average shares outstanding18,044 18,372 
Earnings (loss) per share - basic $1.30
 $4.40
 $(1.37)Earnings (loss) per share - basic$(1.12)$1.96 
Earnings (loss) per share - diluted $1.29
 $4.34
 $(1.37)Earnings (loss) per share - diluted$(1.12)$1.93 
For the years ended December 31, 20172020 and 2016, options to purchase2019, 0.6 million and 0.3 million and 0.2 million shares of common stock for each of the years presentedweighted-average equity instruments, respectively, were outstanding but were not included in the computation of diluted net incomeearnings per share because the exercise price exceeded the average price of the underlying shares and thetheir effect would have been anti-dilutive. For the year ended December 31, 2015, 0.4 million shares of the Company's outstanding equity awards were excluded from the calculation of diluted loss per share because their inclusion would have been anti-dilutive. For the years ended December 31, 2017, 2016 and 2015, options to purchase of 0.2 million, 0.2 million and 0.1 million shares of common stock, respectively, which vest based on the Company achieving specified performance targets, were outstanding, but not included in the computation of diluted net income per share because they were determined not to be contingently issuable.
Use of Estimates
The preparation of the Company’s consolidated financial statements in conformity with accounting principles generally accepted in the United States ("U.S. GAAPGAAP") requires the Company’s management to make estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. Actual results could differ from those estimates. The Company makes assumptions on the following significant financial statement components including:
revenue recognition and warranty estimates accruals related to the Company's extended equipment contracts;business combinations, including asset acquisitions;
the carrying value of its long-lived assets;
the allowance for doubtful accounts receivable;carrying value of its intangible assets;
stock compensation costs;AROs; and
estimates related to future obligations, including the Royalty Award, and other legal accruals; and
income taxes, including the valuation allowance for deferred tax assets and uncertain tax positions.
Due to the coronavirus ("COVID-19") pandemic, there has been uncertainty and disruption in the global economy and financial markets. Additionally, due to COVID-19, overall power generation and coal-fired power demand may change, which could also
64


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

have a material adverse effect on the Company. The Company is not aware of any specific event or circumstance due to COVID-19 that would require an update to its estimates or judgments or a revision of the carrying values of its assets or liabilities through the date of this Report. These estimates may change as new events occur and additional information is obtained. Actual results could differ materially from these estimates under different assumptions or conditions
Risks and Uncertainties
The Company’s earnings are significantly affected by equity earnings it receives from Tinuum Group. As of December 31, 2020, Tinuum Group has 1723 invested RC facilities of which 119 are leased to a single customer. A majorityBoth Tinuum Group and Tinuum Services expect to significantly wind down their operations by the end of these leases are periodically renewed and2021 due to the
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

expected expiration of the Section 45 tax credit period as of December 31, 2021. The loss of this customer by Tinuum Group wouldGroup's customers, reduction in revenue streams as a result of lease renewals and the expiration of Section 45 tax credits will have a significant adverse impact on itsTinuum Group's financial position, results of operations and cash flows, which in turn wouldwill have a material adverse impact on the Company’s financial position, results of operations and cash flows.
Reclassifications
Certain balances have been reclassified from prior years to conform to the current year presentation. Such reclassifications had no effect on the Company’s results of operations or financial position in any of the periods presented.
New Accounting Guidance
In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which provides a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific guidance. The core principle of ASU 2014-09 is that “an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 and its related amendments are effective for reporting periods (including interim periods) beginning after December 31, 2017. The standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption ("modified retrospective method"). The Company will adopt the standard under the modified retrospective method effective January 1, 2018, which will be reflected in its financial statements as of and for the three months ended March 31, 2018.Not yet Adopted
As of the date of this filing, the Company has completed its assessment of ASU 2014-09 for the impact to the financial statements as of the adoption date, completed a detailed review of individual customer contracts, completed its review of controls and procedures that will be revised or added from the adoption of the standard, and completed its documentation of the standard's financial statement impact at adoption, financial statement presentation and disclosure changes and changes to existing revenue recognition policies, controls and procedures.
As of the adoption date of ASU 2014-09, the Company has determined that deferred revenue and deferred project costs on uncompleted contracts as of December 31, 2017 related to equipment sales projects will be derecognized through a cumulative effect adjustment, which will reduce the opening balance of the Accumulated deficit in the amount of approximately $1.7 million, net of income taxes. In addition, as of the adoption date, the Company will also derecognize deferred revenue and deferred project costs as of December 31, 2017 for a technology licensing arrangement through a cumulative effect adjustment, which will reduce the Accumulated deficit in the amount of approximately $1.3 million, net of income taxes. Except for the reclassification of the Company's royalties received from related parties from Other income to Revenue, the Company expects that there will be no material financial statement impact as of the adoption date from other uncompleted contracts.

In January 2016, the FASB issued ASU 2016-01, Financial Instruments (Subtopic 825-10) - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"). This standard provides guidance on how entities measure certain equity investments and present changes in the fair value. This standard requires that entities measure certain equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and recognize any changes in fair value in net income. ASU 2016-01 is effective for fiscal years beginning after December 31, 2017. The Company is currently evaluating the provisions of this guidance and assessing its impact on the Company's financial statements and disclosures. The Company does not believe this standard will have a material impact on the Company's financial statements and disclosures.
In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) ("ASU 2016-02"), which requires lessees to recognize a right of use asset and related lease liability for those leases classified as operating leases at the commencement date and have lease terms of more than 12 months. This topic retains the distinction between finance leases and operating leases. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those years, and must be applied under a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company is currently evaluating the provisions of this guidance and assessing its impact on the Company's financial statements and disclosures.
In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments(" ("ASU 2016-13"). The main objective of ASU 2016-13 is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in ASU 2016-13 replace the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 is effective for "smaller reporting companies" (as defined by the Securities and Exchange Commission) for fiscal years beginning after December 15, 2019,2022, including interim periods within those years, and must be adopted under a modified retrospective method approach. Entities may adopt ASU 2016-13 earlier as of the fiscal years beginning after December 15, 2018, including interim periods within those years. The Company is currently evaluating the
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

provisions of this guidance and assessing its impact on the Company's financial statements and disclosures. The Companydisclosures and does not believe this standard will have a material impact on the Company's financial statements and disclosures.
In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740) Simplifying the Accounting for Income Taxes ("ASU 2019-12"). The amendments in ASU 2019-12 simplify various aspects related to accounting for income taxes by removing certain exceptions contained in Topic 740 and also clarifies and amends existing guidance in Topic 740 to improve consistent application. ASU 2019-12 is effective for public business entities beginning after December 15, 2020, including interim periods within those years, and early adoption is permitted. The Company is currently evaluating the provisions of this guidance and assessing its impact on the Company's financial statements and disclosures and does not believe this standard will have a material impact on the Company's financial statements and disclosures.
Note 2 - Customer Supply Agreement
On September 30, 2020, the Company and Cabot Norit Americas, Inc., ("Cabot") entered into a supply agreement (the "Supply Agreement") pursuant to which the Company agrees to sell and deliver to Cabot, and Cabot agrees to purchase and accept from the Company certain lignite-based AC products ("Furnace Products"). The term of the Supply Agreement is for 15 years with 10-year renewal terms that are automatic unless either party provides three years prior notice of intention not to renew before the end of any term.
In addition to the sale by the Company and purchase by Cabot of Furnace Products, the Company and Cabot have agreed to additional terms whereby Cabot will reimburse the Company for certain capital expenditures incurred by the Company that are necessary to manufacture the Furnace Products. Reimbursements will be in the form of revenues earned from capital expenditures incurred that will benefit both the Company and Cabot (referred to as "Shared Capital") and capital expenditures incurred that will benefit Cabot exclusively (referred to as "Specific Capital").
65


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Revenues are earned on Shared Capital ("Shared Capital revenues") based on the percentage of planned Furnace Products produced and sold divided by the Company’s total products produced and sold for each year multiplied by a factor, which is based on the cost of Shared Capital assets placed in service amortized as an annuity over the expected asset life (lives) using an interest rate that is mutually agreed to by both the Company and Cabot. Shared Capital revenues are recognized and billable beginning on the first day of a half year (either January 1 or July 1 of a calendar year) following the placed in service date of a Shared Capital asset(s).
Revenues are earned on Specific Capital ("Specific Capital revenues") and are based on a factor, which is based on the cost of Specific Capital assets placed in service amortized as an annuity over five years using an interest rate that is mutually agreed to by both the Company and Cabot. Specific Capital revenues are recognized beginning on the first day of a half year (either January 1 or July 1 of a calendar year) following the placed in service date of a Specific Capital asset(s) and are billable in quarterly installments beginning on the first day of a half year following the placed in service date of a Specific Capital asset(s). In the event that Cabot ceases to make purchases under the Supply Agreement, Cabot is obligated to pay the balance of any outstanding payments for Specific Capital.
Note 3 - Acquisition of Marshall Mine
Concurrently with the execution of the Supply Agreement, on September 30, 2020, the Company entered into an agreement to purchase (the "Mine Purchase Agreement") from Cabot 100% of the membership interests in Marshall Mine, LLC (the "Marshall Mine Acquisition") for a nominal purchase price. Marshall Mine, LLC owns a lignite mine located outside of Marshall, Texas (the "Marshall Mine"). The Company independently determined to immediately commence activities to shutter the Marshall Mine and will incur the associated reclamation costs.
In conjunction with the execution of the Supply Agreement and the Mine Purchase Agreement, on September 30, 2020, the Company entered into a reclamation contract (the "Reclamation Contract") with a third party that provides a capped cost, subject to certain contingencies, in the amount of approximately $19.7 million plus an obligation to pay certain direct costs of approximately $3.6 million (collectively, the "Reclamation Costs") over the estimated reclamation period of 10 years (the "Reclamation Period"). Under the terms of the Supply Agreement, Cabot is obligated to reimburse the Company for $10.2 million of Reclamation Costs (the "Reclamation Reimbursements"), which are payable semi-annually over 13 years and inclusive of interest. In the event that Cabot has a change in control as described in the Supply Agreement, all outstanding balances of the Reclamation Reimbursements shall be due and payable in full. See further discussion of the Reclamation Costs and Reclamation Reimbursements in Note 4.
As the owner of the Marshall Mine, the Company was required to post a surety bond to ensure performance of its reclamation activities. On September 30, 2020, the Company and a third party entered into a Surety Bond Indemnification Agreement (the "Surety Agreement") pursuant to which the Company secured and posted a $30.0 million surety bond (the "Bond") with the local regulatory agency. The Bond will remain in place until the Marshall Mine is fully shuttered, and it may be reduced in amount from time to time as the Company progresses with its reclamation activities. For the obligations due under the Reclamation Contract, the Company was required to post collateral of $5.0 million as of September 30, 2020 and to post an additional $5.0 million as of March 31, 2021.
The Marshall Mine Acquisition included the acquisition of certain assets that will be consumed and the assumption of certain liabilities that will be paid in reclamation of the Marshall Mine, in addition to the incurrence of an obligation for the Reclamation Costs. The Company determined that the Marshall Mine Acquisition should be accounted for as an asset acquisition as it did not meet the definition of a business. The Company's conclusion was based on the Marshall Mine not having any economic reserves, as the Company commenced full reclamation as of September 30, 2020, and therefore lacked inputs.
As the Marshall Mine Acquisition represents a transaction with a customer of net assets acquired and liabilities assumed from Cabot, the Company has accounted for the excess of the fair value of liabilities assumed over assets acquired as upfront consideration transferred to a customer, Cabot (the "Upfront Customer Consideration"). The amount of the Upfront Customer Consideration was recognized net of an additional asset recognized in the Marshall Mine Acquisition, which was comprised of a receivable from Cabot (the "Cabot Receivable") for the Reclamation Reimbursements. The Cabot Receivable is further discussed in Note 4.
The total Upfront Customer Consideration is amortized on a straight-line basis as a reduction to revenue over the expected 15-year contractual period of the Supply Agreement.
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Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

The Company paid a nominal cash amount to Cabot in the form of cash for the Marshall Mine and also assumed liabilities whose fair value exceeded the fair value of assets acquired. The net assets acquired and liabilities assumed and the additional assets recorded for the Marshal Mine Acquisition as of September 30, 2020 are shown in the table below. Subsequent to this date, the Company completed additional analysis and adjustments were made as noted in the table below:
(in thousands)As Originally ReportedAdjustmentsAs Adjusted
Assets acquired:
Receivables$$513 $513 
Property, plant and equipment3,863 3,863 
Spare parts100 100 
Liabilities assumed:
Accounts payable and accrued expenses(673)160 (513)
Asset retirement obligation(21,328)(21,328)
Net assets acquired and liabilities assumed from Marshall Mine acquisition(18,038)673 (17,365)
Cabot receivable9,749 9,749 
Upfront Customer Consideration$8,289 $(673)$7,616 
The Company also evaluated the Marshall Mine entity as a VIE, and determined that because of its structure and closing-stage status, it does not have sufficient equity at-risk and would not likely be able to obtain additional subordinated financial support to complete its closing stage obligations. The Company purchased all of the membership interests in Marshall Mine, LLC and has determined that it meets the definition of a VIE and that the Company is the primary beneficiary. Therefore, Marshall Mine, LLC’s assets and liabilities are consolidated as of December 31, 2020.
Note 4 - Marshall Mine Asset Retirement Obligation and related Cabot Receivable
Asset Retirement Obligation
In connection with the Supply Agreement, Mine Purchase Agreement and the Reclamation Contract, the Company assumed the obligation to reclaim and restore the land associated with the Marshall Mine. The Company determined that the Marshall Mine does not have any remaining economic reserves. As of September 30, 2020, the Company recorded an ARO (the "Marshall Mine ARO") for the total Reclamation Costs of $21.3 million as measured at the expected future cash flows of $23.7 million, inclusive of contingency costs, discounted to their present value using a discount rate based on a credit-adjusted, risk-free rate of 7.0%.
Cabot Receivable
As previously disclosed, under the terms of the related Supply Agreement, Cabot is obligated to pay Reclamation Reimbursements to the Company for $10.2 million of the Reclamation Costs, inclusive of interest. As of September 30, 2020, the Company recorded the Cabot Receivable for the Reclamation Reimbursements at its estimated fair value, which was measured using a discounted cash flows valuation model that considers the estimated credit risk associated with the obligor’s (Cabot’s) future performance. Interest is accreted on a monthly basis and recognized as interest income. There were no significant related fees or costs associated with the Cabot Receivable.
As of September 30, 2020, the Company recorded the Cabot Receivable at its estimated fair value of $9.7 million, reflecting a discount rate of approximately 1.5% or $0.5 million. Allowances for this asset are assessed periodically, and 0 allowance was deemed necessary as of December 31, 2020.
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Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Note 5 - Impairment
As part of its periodic review of the carrying value of long-lived assets, the Company assessed its long-lived assets for potential impairment. In assessing impairment of its APT segment's long-lived asset groups, the Company considered factors such as the significant decline in both the APT segment's trailing twelve months revenues and current and future years’ forecasted revenues. These factors were largely due to the significant drop in coal-fired power dispatch amid historically low prices of alternative power generation sources, such as natural gas, leading to an increase in natural gas usage as well as other competing energy sources.
As of June 30, 2020, the Company completed an undiscounted cash flow analysis of its APT segment's long-lived assets (the "Asset Group"), which were comprised of its manufacturing plant and related assets and its lignite mine assets. The estimated undiscounted cash flows from the Asset Group was $54.7 million, which was less than the carrying value of the Asset Group of $58.3 million. Accordingly, the Company completed an assessment of the Asset Group’s fair value and estimated the fair value of the Asset Group at $32.2 million. This resulted in an impairment and write-down of the Asset Group (the "Impairment Charge") of $26.1 million as of June 30, 2020. The Impairment Charge is reflected as "Impairment of long-lived assets" in the Consolidated Statement of Operations for the year ended December 31, 2020, and was allocated to the APT segment.
The following table summarizes the allocation to the Asset Group of the Impairment Charge of $26.1 million recorded as of June 30, 2020:
(in thousands)
Property, plant and equipment, net$18,986 
Intangible assets, net1,445 
Other long-term assets, net5,672 
Total impairment$26,103 
The Company engaged an independent third party to perform the valuation of the Asset Group in order to determine the estimated fair value of the Asset Group. This valuation was based on the use of several established valuation models including an expected future discounted cash flow model using Level 3 inputs. The cash flows are those expected to be generated by market participants discounted at the risk-free rate of interest. Because of the continued future uncertainty surrounding the level of coal-fired dispatch, the impact of historically low natural gas prices and other estimates impacting the expected future cash flow, it is reasonably possible that the expected future cash flows may change in the near term and may result in the Company recording additional impairment of the Asset Group.
Note 6 - COVID-19
In response to the COVID-19 outbreak, in March 2020, the federal government passed the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act"). The CARES Act provided, among other things, the creation of the Paycheck Protection Program ("PPP"), which is sponsored and administered by the U.S. Small Business Administration ("SBA"). In June 2020, the Paycheck Protection Program Flexibility Act of 2020 (the "PPPFA") was signed into law and established the payment dates in the event that amounts borrowed under the PPP are not forgiven.
On April 20, 2020, the Company entered into a loan (the "PPP Loan") under the PPP, evidenced by a promissory note, with BOK, NA dba Bank of Oklahoma ("BOK") providing for $3.3 million in proceeds, which was funded to the Company on April 21, 2020. The PPP Loan matures April 21, 2022. The PPP Loan principal may be forgiven subject to the terms of the PPP and approval by the SBA. The Company recorded the PPP Loan as a debt obligation and is accruing interest over the term of the PPP Loan. There is no assurance that the PPP Loan will be forgiven.
The interest rate on the PPP Loan is 1.0%. The PPP Loan is unsecured and contains customary events of default relating to, among other things, payment defaults, making materially false and misleading representations to the SBA or BOK, or breaching the terms of the PPP Loan. The occurrence of an event of default may result in the repayment of all amounts outstanding, collection of all amounts owing from the Company, or filing suit and obtaining judgment against the Company.
Under the PPPFA, monthly payments of principal and interest commence on the later of 10 months following the "covered period" (as defined in the PPPFA) or the date that BOK notifies the Company that the SBA has notified BOK that all or a portion of the PPP Loan has not been forgiven. In January 2021, the Company submitted its application to the SBA for
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Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

forgiveness of the PPP Loan, and the Company is awaiting the SBA's response on its application for forgiveness. Accordingly, the Company has determined that any amounts due under the PPP Loan would commence in August 2021 and, as of December 31, 2020, has classified a portion of the PPP Loan principal and accrued interest as current in the Consolidated Balance Sheet.
The CARES Act also provided the deferral of payroll tax payments for all payroll taxes incurred through December 31, 2020. The Company elected to defer payments of payroll taxes for the periods allowed under the CARES Act and will repay 50% by December 31, 2021 and 50% by December 31, 2022. As of December 31, 2020, the Company has deferred $0.4 million of payroll tax payments under the CARES Act.
Note 27 - Equity Method Investments
Tinuum Group, LLC
As of December 31, 20172020 and 2016,2019, the Company’s ownership in Tinuum Group was 42.5%. Tinuum Group supplies technology, equipment and technical services to cyclone-fired and other boiler users, but its primary purpose is to place into operation facilities that produce and sell RC that lower emissions and therefore qualifies for Section 45 tax credits. NexGen Refined Coal, LLC ("NexGen") and GSFS Investments I Corp. (“GSFS”("GSFS"), an affiliate of The Goldman Sachs Group, Inc. ("GS"), own the remaining 42.5% and 15.0%, respectively of Tinuum Group. GSFS' ownership interest is in the form of Class B units whichthat do not have voting rights but provide certain preferences over ADA and NexGen as to liquidation and profit distribution, including a guaranteed 15% annual return on GSFS' unrecovered investment balance, which is calculated as the original GSFS investment, plus a 15% annual return thereon, less any distributions, including the allocation of Section 45 tax credits to the members. Additionally, on the 10-year anniversary of the date the last RC facility owned by Tinuum Group or one of its subsidiaries is placed into service, but no later than December 31, 2021, if GSFS's unrecovered investment balance has not been reduced to zero, GSFS may require Tinuum Group to redeem its Class B units for an amount equal to the then unrecovered investment balance, payable within 180 days of the notice of redemption. GSFS has no further capital call requirements and does not have a voting interest, but does have approval rights over certain corporate transactions. However, the Class B units do not have voting rights and ADA and NexGen each maintain a 50% voting interest in Tinuum Group. In February 2018, the unrecovered investment balance associated with the Class B units was repaid in full.distribution.
The Company has determined that Tinuum Group is a VIE, however, the Company does not have the power to direct the activities that most significantly impact Tinuum Group's economic performance and has therefore accounted for the investment under the equity method of accounting. The Company determined the voting partners of Tinuum Group have identical voting rights, equity control interests and board control interests, and therefore, concluded that the power to direct the activities that most significantly impact Tinuum Group's economic performance was shared.
The following tables summarize the assets, liabilities and results of operations of Tinuum Group:
  As of December 31,
(in thousands) 2017 2016
Current assets $31,068
 $24,584
Non-current assets $75,592
 $83,621
Current liabilities $48,280
 $43,117
Non-current liabilities $8,350
 $11,456
Redeemable Class B equity $821
 $18,250
Members equity attributable to Class A members $40,452
 $26,475
Noncontrolling interests $8,757
 $8,907
  Years Ended December 31,
(in thousands) 2017 2016 2015
Gross profit $95,552
 $92,305
 $108,416
Operating, selling, general and administrative expenses 22,958
 23,662
 23,405
Income from operations 72,594
 68,643
 85,011
Other expenses (4,520) (8,775) (2,203)
Class B preferred return (1,712) (3,901) (6,157)
Loss attributable to noncontrolling interest 43,474
 27,234
 10,675
Net income available to Class A members $109,836
 $83,201
 $87,326
ADES equity earnings from Tinuum Group $48,875
 $41,650
 $8,651
As of December 31,
(in thousands)20202019
Current assets$142,440 $129,377 
Non-current assets$28,649 $124,916 
Current liabilities$44,278 $59,392 
Non-current liabilities$5,186 $13,340 
Members equity attributable to Class A members$59,221 $117,006 
Members equity attributable to Class B members$18,769 $28,967 
Noncontrolling interests$43,635 $35,588 
Years Ended December 31,
(in thousands)20202019
Gross profit$6,649 $104,976 
Operating, selling, general and administrative expenses58,008 37,641 
(Loss) income from operations(51,359)67,335 
Other income (expense)17,260 (95)
Loss attributable to noncontrolling interest91,501 78,544 
Net income available to Class A and B members$57,402 $145,784 
ADES equity earnings from Tinuum Group$24,396 $60,286 
As shown above, the Company reported earnings from its equity investment in Tinuum Group of $48.9 million, $41.7$24.4 million and $8.7$60.3 million for the years ended December 31, 2017, 20162020 and 2015,2019, respectively.
As shown in the table below, the Company’s carrying value in Tinuum Group was reduced to zero for all years presented as cumulative cash distributions received from Tinuum Group exceeded the Company's pro-rata share of cumulative earnings in
69


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


Tinuum Group. The carrying value of the Company's investment in Tinuum Group shall remain zerobe 0 as long as the cumulative amount of distributions received from Tinuum Group continues to exceedexceeds the Company's cumulative pro-rata share of Tinuum Group's net income available to Class A members. For periods during which the ending balance of the Company's investment in Tinuum Group is zero,0, the Company only recognizes equity earnings from Tinuum Group to the extent that cash distributions are received from Tinuum Group during the period. For periods during which the ending balance of the Company's investment is greater than zero0 (e.g., when the cumulative earnings in Tinuum Group exceeds cumulative cash distributions received), the Company recognizes its pro-rata share of Tinuum Group's net income available to Class A members for the period, less any amount necessary to recover the cumulative earnings short-fall balance as of the end of the immediately preceding period. As of December 31, 2017,shown in the Company'stable below, the Company’s carrying value in Tinuum Group has been reduced to zero, asfor the cumulative cash distributions received from Tinuum Group have exceeded the Company's pro-rata share of cumulative earnings in Tinuum Group. If Tinuum Group subsequently reports net income, the Company will not record its pro-rata share of such net income until the cumulative share of pro-rata income equals or exceeds the amount of its cumulative income recognized due to the receipt of cash distributions. Until such time, the Company will only report income from Tinuum Group to the extent of cash distributions received during the period.years ended December 31, 2020 and 2019 were $3.4 million and $32.3 million, respectively.
Thus, the amount of equity earnings or loss reported on the Consolidated Statement of Operations may differ from a mathematical calculation of earnings or loss attributable to the equity interest based upon the factor of the equity interest and the net income or loss available to Class A members as shown on Tinuum Group’s statement of operations. Additionally, for periods during which the carrying value of the Company's investment in Tinuum Group is greater than zero, distributions from Tinuum Group are reported on the Consolidated Statements of Cash Flows as "Distributions from equity method investees, return on investment" within Operating cash flows. For periods during which the carrying value of the Company's investment in Tinuum Group is zero, such cash distributions are reported on the Consolidated Statements of Cash Flows as "Distributions from equity method investees in excess of investment basis" within Investing cash flows.
The following table presents the Company's investment balance, equity earnings, cash distributions and cash distributions in excess of the investment balance for the years ended December 31, 2015 through2019 and December 31, 20172020 (in thousands):
DescriptionDate(s)Investment balanceADES equity earnings (loss)Cash distributionsMemorandum Account: Cash distributions and equity loss in (excess) of investment balance
Beginning balance12/31/2018$$$$(1,672)
Impact of adoption of accounting standards (1)
2019 activity37,232 0 
ADES proportionate share of net income from Tinuum Group2019 activity61,958 61,958 
Recovery of cash distributions in excess of investment balance (prior to cash distributions)2019 activity(1,672)(1,672)0 1,672 
Cash distributions from Tinuum Group2019 activity(65,238)65,238 
Total investment balance, equity earnings (loss) and cash distributions12/31/2019$32,280 $60,286 $65,238 $
ADES proportionate share of net income from Tinuum Group2020 activity24,396 24,396 
Cash distributions from Tinuum Group2020 activity(53,289)53,289 
Total investment balance, equity earnings and cash distributions12/31/2020$3,387 $24,396 $53,289 $
Description Date(s) Investment balance ADES equity earnings (loss) Cash distributions Memorandum Account: Cash distributions and equity loss in (excess) of investment balance
Beginning balance 12/31/2014 $
 $
 $
 $(29,877)
ADES proportionate share of net income from Tinuum Group (1)
 2015 activity 35,265
 35,265
 
 
Recovery of cash distributions in excess of investment balance (prior to cash distributions) 2015 activity (29,877) (29,877) 
 29,877
Cash distributions from Tinuum Group 2015 activity (8,651) 
 8,651
 
Adjustment for current year cash distributions in excess of investment balance 2015 activity 3,263
 3,263
 
 (3,263)
Total investment balance, equity earnings (loss) and cash distributions 12/31/2015 $
 $8,651
 $8,651
 $(3,263)
ADES proportionate share of net income from Tinuum Group (1)
 2016 activity $35,019
 $35,019
 $
 $
Recovery of cash distributions in excess of investment balance (prior to cash distributions) 2016 activity (3,263) (3,263) 
 3,263
Cash distributions from Tinuum Group 2016 activity (41,650) 
 41,650
 
Adjustment for current year cash distributions in excess of investment balance 2016 activity 9,894
 9,894
 
 (9,894)
Total investment balance, equity earnings (loss) and cash distributions 12/31/2016 $
 $41,650
 $41,650
 $(9,894)
ADES proportionate share of net income from Tinuum Group (1)
 2017 activity $46,551
 $46,551
 $
 $
Recovery of cash distributions in excess of investment balance (prior to cash distributions) 2017 activity (9,894) (9,894) 
 9,894
Cash distributions from Tinuum Group 2017 activity (48,875) 
 48,875
 
Adjustment for current year cash distributions in excess of investment balance 2017 activity 12,218
 12,218
 
 (12,218)
Total investment balance, equity earnings and cash distributions 12/31/2017 $
 $48,875
 $48,875
 $(12,218)
Advanced Emissions Solutions, Inc.(1) Tinuum Group adopted ASC Topic 606, Revenue from Contracts with Customers ("ASC 606") and Subsidiaries
Notes to Consolidated Financial Statements

(1) The amountsASC Topic 842, Leases ("ASC 842") as of January 1, 2019. As a result of Tinuum Group’s adoption of these standards, the Company recorded a cumulative adjustment of $27.4 million, net of the impact of income taxes, related to the Company's 42.5% proportionate share of net income as shown in the table above differ from mathematical calculations of the Company’s 42.5% equity interest in Tinuum Group multiplied by the amounts of Net Income available to Class A members as shown in the table abovepercentage of Tinuum Group's resultscumulative effect adjustment that increased the Company's Retained earnings as of operations due to adjustments related to the Class B preferred return and the elimination of Tinuum Group's earnings attributable to RCM6, of which the Company owned 24.95% during the year ended December 31, 2015 and for the period from January 1, through March 3, 2016. As noted below, the Company sold its interest in RCM6 on March 3, 2016.2019.
Additional information related to Tinuum Group pursuant to Regulation S-X Rule 3-09 ("Rule 3-09") of the Securities and Exchange Act of 1934 (the "Exchange Act") is included withinin Item 15 - "Exhibits and Financial Statement Schedules" ("Item 15") of this Form 10-K.Report.
Tinuum Services, LLC
In 2010, the Company, together with NexGen, formed Tinuum Services for the purpose of operating and maintaining RC facilities, including those RC facilities leased or sold to third parties. The Company has determined that Tinuum Services is not a VIE and has evaluated theTinuum Services for potential consolidation analysis under the Voting Interest Model. The Company has a 50% voting and economic interest in Tinuum Services, which is equivalent to the voting and economic interest of NexGen. Therefore, asmodel. Because the Company does not holdown greater than 50% of the outstanding voting interests, either directly or indirectly,shares, it has accounted for theits investment in Tinuum Services under the equity method of accounting.
As of December 31, 20172020 and 2016,2019, the Company’s 50% investment in Tinuum Services was $4.3$4.2 million and $4.0$6.8 million, respectively.

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Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

The following tables summarize the assets, liabilities and results of operations of Tinuum Services:
  As of December 31,
(in thousands) 2017 2016
Current assets $546,681
 $278,001
Non-current assets $98,640
 $3,426
Current liabilities $178,376
 $97,093
Non-current liabilities $75,717
 $1,488
Equity $8,569
 $7,918
Noncontrolling interests $382,659
 $174,928
  Years Ended December 31,
(in thousands) 2017 2016 2015
Gross loss $(64,796) $(54,644) $(42,496)
Operating, selling, general and administrative expenses 147,917
 134,782
 161,456
Loss from operations (212,713) (189,426) (203,952)
Other expenses (68) (56) (118)
Loss attributable to noncontrolling interest 222,707
 198,464
 213,746
Net income $9,926
 $8,982
 $9,676
ADES equity earnings from Tinuum Services $4,963
 $4,491
 $4,838
 As of December 31,
(in thousands)20202019
Current assets$301,670 $308,249 
Non-current assets$45,575 $99,261 
Current liabilities$187,097 $155,836 
Non-current liabilities$6,451 $55,277 
Equity$8,483 $13,626 
Noncontrolling interests$145,214 $182,771 
 Years Ended December 31,
(in thousands)20202019
Gross loss$(87,723)$(102,172)
Operating, selling, general and administrative expenses171,095 199,691 
Loss from operations(258,818)(301,863)
Other expenses(1,282)(1,422)
Loss attributable to noncontrolling interest273,262 321,077 
Net income$13,162 $17,792 
ADES equity earnings from Tinuum Services$6,582 $8,896 
Included withinin the Consolidated Statement of Operations of Tinuum Services duringfor the years ended December 31, 2017, 20162020 and 20152019 were losses related to VIE entities that are consolidated within Tinuum Services of $222.7 million, $198.5$273.3 million and $213.7$321.1 million, respectively. These losses do not impact the Company's equity earnings from Tinuum Services as 100% of those losses are attributable to a noncontrolling interest and eliminated in the calculations of Tinuum Services' net income attributable to the Company's interest.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Other
On March 3, 2016, the Company sold its 24.95% membership interest in RCM6 for a cash payment of $1.8 million and the assumption, by the buyer, of an outstanding note payable made (the ("RCM6 Note Payable") by the Company in connection with its purchase of RCM6 membership interests from Tinuum Group. In doing so, the Company recognized a gain on the sale of $2.1 million for the year ended December 31, 2016, which is included within the Other line item in the Consolidated Statements of Operations. As a result of the sale of its ownership interest, the Company ceased to be a member of RCM6 and, as such, is no longer subject to any quarterly capital calls and variable payments to RCM6. In addition, the Company has no future obligations related to the RCM6 Note Payable. However, the Company still receives its pro-rata share of income and cash distributions through its ownership in Tinuum Group based on the RCM6 lease payments made to Tinuum Group.
Prior to the sale of its ownership interest, the Company recognized equity losses related to its investment in RCM6 of $0.6 million for the three months ended March 31, 2016.
On July 27, 2017, the Company obtained a 50% membership interest in GWN Manager in exchange for a capital contribution of $0.1 million. GWN Manager subsequently purchased a 0.2% membership interest in a subsidiary of Tinuum Group, which owns a single RC facility that produces RC that qualifies for Section 45 tax credits. Tinuum Group sold 49.9% of the subsidiary that owns the RC facility to an unrelated third party and retained ownership of the remaining 49.9%. GWN Manager is subject to monthly capital calls based on estimated working capital needs.
The Company has determined that GWN Manager is not a VIE and has evaluated the consolidation analysis under the Voting Interest Model. Because the Company does not own greater than 50% of the outstanding voting shares, either directly or indirectly, it has accounted for its investment in GWN Manager under the equity method of accounting.
As December 31, 2017, the Company's ownership in GWN Manager was 50%. The Company's investment in GWN Manager as of December 31, 2017, was $0.1 million.
The following table details the carrying value of the Company's respective equity method investments included withinin the Equity method investments line item on the Consolidated Balance Sheets and indicates the Company's maximum exposure to loss:
 As of December 31, As of December 31,
(in thousands) 2017 2016(in thousands)20202019
Equity method investment in Tinuum Group $
 $
Equity method investment in Tinuum Group$3,387 $32,280 
Equity method investment in Tinuum Services 4,284
 3,959
Equity method investment in Tinuum Services4,242 6,813 
Equity method investment in other 67
 
Equity method investment in other63 62 
Total equity method investments $4,351
 $3,959
Total equity method investments$7,692 $39,155 
The Company evaluates the investments for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment might not be recoverable. NoNaN impairments were recorded during the years ended December 31, 2017, 20162020 and 2015.2019.

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Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

The following table details the components of the Company's respective earnings or loss from equity method investments included withinin the Earnings from equity method investments line item onin the Consolidated Statements of Operations:
 Year ended December 31,Year ended December 31,
(in thousands) 2017 2016 2015(in thousands)20202019
Earnings from Tinuum Group $48,875
 $41,650
 $8,651
Earnings from Tinuum Group$24,396 $60,286 
Earnings from Tinuum Services 4,963
 4,491
 4,838
Earnings from Tinuum Services6,582 8,896 
Earnings (losses) from other 5
 (557) (4,568)
Earnings (loss) from otherEarnings (loss) from other(6)
Earnings from equity method investments $53,843
 $45,584
 $8,921
Earnings from equity method investments$30,978 $69,176 
The following table details the components of the cash distributions from the Company's respective equity method investments included withinas a component of cash flows from operating activities in the Consolidated Statements of Cash Flows. Distributions from equity method investees are reported onin the Consolidated Statements of Cash Flows as “return"return on investment” withininvestment" in Operating cash flows until such time as the carrying value in an equity method investee company is reduced to zero;0; thereafter, such distributions are reported as “distributions"distributions in excess of cumulative earnings” within Investingearnings" as a component of cash flows.flows from investing activities.
Year ended December 31,
(in thousands)20202019
Distributions from equity method investees, return on investment
Tinuum Group$53,289 $65,238 
Tinuum Services9,152 8,650 
Included in Operating Cash Flows$62,441 $73,888 
Note 8 - Acquisition of ADA Carbon Solutions
On December 7, 2018 (the "Acquisition Date"), the Company completed the Carbon Solutions Acquisition. The Company acquired Carbon Solutions primarily to expand the Company's product offerings in the consumable air treatment markets.
The Company completed the Carbon Solutions Acquisition for a total purchase price of $75.0 million (the "Purchase Price"). The fair value of the purchase consideration totaled $66.5 million and consisted of cash of $65.8 million and an additional purchase adjustment amount payable to Carbon Solutions' secured lender of $0.7 million, which was paid in March 2019. The Purchase Price was adjusted by assumed debt and contractual commitments of $11.8 million, and less cash acquired of $3.3 million. The Company also paid $4.5 million in acquisition-related costs (or transaction costs). The Company funded the cash consideration from cash on hand and the proceeds from a senior term loan facility (the "Senior Term Loan") in the principal amount of $70.0 million, as more fully described in Note 11.
72


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


  Year ended December 31,
(in thousands) 2017 2016 2015
Distributions from equity method investees, return on investment      
Tinuum Group (1)
 $
 $3,400
 $
Tinuum Services 4,638
 4,500
 5,019
Included in Operating Cash Flows $4,638
 $7,900
 $5,019
Distributions from equity method investees in excess of cumulative earnings      
Tinuum Group $48,875
 $38,250
 $8,651
Included in Investing Cash Flows $48,875
 $38,250
 $8,651
The following table summarizes the final Purchase Price allocation. Subsequent to December 31, 2018, the Company completed additional analysis and adjustments were made to the preliminary Purchase Price allocations as noted in the table below:
(1)
Fair value of assets acquired:As Originally ReportedAdjustmentsAs Adjusted
Cash$3,284 $$3,284 
Receivables6,409 6,409 
Inventories22,100 (356)21,744 
Prepaid expenses and other current assets2,992 61 3,053 
Spare parts3,359 3,359 
Property, plant and equipment43,033 (377)42,656 
Mine leases and development2,500 200 2,700 
Mine reclamation asset2,402 2,402 
Intangible assets4,000 100 4,100 
Other assets168 168 
Amount attributable to assets acquired87,845 2,030 89,875 
Fair value of liabilities assumed:
Accounts payable4,771 4,771 
Accrued liabilities7,354 254 7,608 
Equipment lease liabilities8,211 8,211 
Mine reclamation liability626 1,776 2,402 
Other liabilities437 437 
Amount attributable to liabilities assumed21,399 2,030 23,429 
Net assets acquired$66,446 $$66,446 
Adjustments to the preliminary Purchase Price allocation primarily related to changes in fair values assigned to property, plant and equipment, intangible assets, mine reclamation liability and the related mine reclamation asset as a result of the final valuation report from the Company's third-party valuation firm issued in May 2019. During the three monthsyear ended MarchDecember 31, 2016,2019 based on new information of facts and circumstances that existed as of the Acquisition Date, the Company revised its estimates used as of the Acquisition Date related to the net realizable value of certain finished goods inventory items as well as values assigned to certain prepaid and accrued expense items.
The adjustments were recorded as of June 30, 2019 and were included in the Consolidated Balance Sheet as of that date and the resultant impact to the Statement of Operations was reflected for the year ended December 31, 2019.
The following table represents the intangible assets identified as part of the Carbon Solutions Acquisition:
(in thousands)AmountWeighted Average Useful Life (years)
Customer relationships$2,200 5
Developed technology1,600 5
Trade name300 2
Total intangibles acquired$4,100 
73


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Note 9 - Inventories, net
The following table summarizes the Company's cumulative shareinventories recorded at the lower of pro-rata Tinuum Group'saverage cost or net income availablerealizable value as of December 31, 2020 and 2019:
As of December 31,
(in thousands)20202019
Product inventory$8,361 $13,515 
Raw material inventory1,521 1,945 
$9,882 $15,460 
Note 10 - Property, Plant and Equipment
The carrying basis and accumulated depreciation of property, plant and equipment at December 31, 2020 and 2019 are summarized in the table below:
Life in YearsAs of December 31,
(in thousands)20202019
Land and land improvements0-31$891 $1,764 
Plant and operating equipment1-3025,703 44,015 
Furniture and fixtures3-111,259 1,201 
Machinery and equipment1-8688 1,235 
Leasehold improvements2-32,089 245 
Construction in progress2,143 2,985 
32,773 51,445 
Less accumulated depreciation(3,340)(7,444)
Total property, plant and equipment, net$29,433 $44,001 
Included in plant and operating equipment as of December 31, 2020 and 2019 is mining equipment financed under various lease facilities, and obligations due under these facilities are included in finance lease obligations in the Consolidated Balance Sheet. The total amount recorded for ROU assets as of December 31, 2020 and 2019 related to Class A members exceeded the amountfinance lease obligations was $2.4 million and $5.9 million, respectively, net of its cumulative earnings recognized due to cash being distributed. As such, the Company recognized $3.4accumulated depreciation of $0.5 million as "return on investment."and $2.3 million.

DuringDepreciation expense for the years ended December 31, 2017, 20162020 and 2015,2019 was $6.8 million and $6.0 million, respectively.
74


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Note 11 - Debt Obligations
Years ended December 31,
(in thousands)20202019
Senior Term Loan due December 2021, related party$16,000 $40,000 
Less: net unamortized debt issuance costs(465)(1,163)
Less: net unamortized debt discount(480)(1,200)
Senior Term Loan due December 2021, net15,055 37,637 
PPP Loan3,305 
Finance lease obligations5,526 6,729 
23,886 44,366 
Less: Current maturities(18,441)(23,932)
Total long-term borrowings$5,445 $20,434 

Senior Term Loan
On December 7, 2018, the Company, and ADA-ES, Inc. ("ADA"), a wholly-owned subsidiary, and certain other subsidiaries of the Company as guarantors, The Bank of New York Mellon as administrative agent, and Apollo Credit Strategies Master Fund Ltd and Apollo A-N Credit Fund (Delaware) L.P. (collectively "Apollo”), affiliates of a beneficial owner of greater than 5 percent of the Company's common stock and a related party, entered into the Senior Term Loan in the aggregate, made purchasesamount of $70.0 million, less original issue discount of $2.1 million. Proceeds from the Senior Term Loan were used to fund the Carbon Solutions Acquisition as disclosed in Note 8. The Company also paid debt issuance costs of $2.0 million related to the Senior Term Loan. The Senior Term Loan matures on December 7, 2021 and contributionsbears interest at a rate equal to 3-month LIBOR (subject to a 1.5% floor) + 4.75% per annum, which is adjusted quarterly to the current 3-month LIBOR rate, and interest is payable quarterly in arrears. Quarterly principal payments of $6.0 million were required beginning in March 2019, and the Company may prepay the Senior Term Loan at any time without penalty. The Senior Term Loan is secured by substantially all of the assets of the Company, including the cash flows from Tinuum Group and Tinuum Services (collectively, the "Tinuum Entities"), but excluding the Company's equity method investmentsinterests in the Tinuum entities.
The Senior Term Loan includes, among others, the following covenants: (1) As of $0.1 million, $0.2the end of each fiscal quarter, the Company must maintain a minimum cash balance of $5.0 million and $2.4shall not permit "expected future net cash flows from the refined coal business" (as defined in the Senior Term Loan) to be less than 1.75 times the outstanding principal amount of the Senior Term Loan; (2) Annual collective dividends and buybacks of Company shares in an aggregate amount, not to exceed $30.0 million, respectively.are permitted so long as (a) no default or event of default exists under the Senior Term Loan and (b) expected future net cash flows from the refined coal business as of the end of the most recent fiscal quarter exceed $100.0 million.
Waiver and Limited Consent on Senior Term Loan
Pursuant to entering into the PPP Loan, on April 20, 2020, the Company and Apollo executed the First Amendment to the Senior Term Loan, which permitted the Company to enter into the PPP Loan.
On September 30, 2020, the Company and Apollo entered into a limited consent, which permitted the Company to (i) enter into the Surety Agreement, open the collateral bank accounts and post collateral required under the Surety Agreement, and (ii) acquire the membership interests in Marshall Mine, LLC., as described in Note 3 - Borrowings3.
75


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

As of December 31, 2020, the following table presents the future aggregate annual maturities of the Senior Term Loan excluding unamortized discounts and deferred financing costs:
Year ended December 31,
(in thousands)Principal Amount
2021$16,000 
2022
2023
2024
2025
Total$16,000 
Line of Credit
In September 2013, ADA,ADA-ES, Inc. ("ADA"), a wholly-owned subsidiary of the Company, as borrower, and the Company, as guarantor, entered into the 2013 Loan and Security Agreementa line credit (the "Line of Credit") with a bank (the "Lender") for an aggregate principal amount of $10$10.0 million that was secured by certain amounts due to the Company from certain Tinuum Group RC leases (the "Line of Credit").leases. The Line of Credit washas been amended nine14 times from the period from December 2, 2013 through November 25, 2016, most notablyDecember 31, 2020, which included a reduction in the principal amount to extend$5.0 million in September 2018.
On September 29, 2020, ADA, the maturity date with each amendment. In addition, during this period,Company and the Lender also granted 10 waivers related"Lender entered into an amendment to various transactions and obligations to provide financial information to the Lender. Covenants in the Line of Credit included a borrowing base limitation that was based on a percentage of the net present value of ADA’s portion of payments due to Tinuum Group from the RC leases. The Line of Credit also contained other affirmative and negative covenants and customary indemnification obligations of ADA to the Lender and provided for the issuance of letters of credit ("LC's"(the "Fourteenth Amendment") provided that the aggregate amount of the LC's plus all advances then outstanding did not exceed the calculated borrowing base. The Company guarantees the obligations and agreements of ADA under the Line of Credit. Amounts outstanding under the Line of Credit bear interest payable monthly at a rate per annum equal to the higher of 5% or the “Prime Rate” (as defined in the Line of Credit) plus 1%. As a result of various covenant violations, the Company had no borrowing availability under the Line of Credit from inception through November 29, 2016.
On November 30, 2016, ADA-ES, Inc., a wholly-owned subsidiary of the Company, as borrower, the Company, as guarantor, and a bank (the "Lender") entered into an amendment (the "Tenth Amendment") to the Line of Credit. The Tenth Amendment increased the Line of Credit to $15.0 million,which extended the maturity date of the Line of Credit to September 30, 2017 and permittedMarch 31, 2021. In addition, the Fourteenth Amendment retained covenants from the prior amendments to the Line of Credit, which included ADA's ability to be usedenter into the Senior Term Loan as collateral (in placea guarantor so long as the principal amount of restricted cash) for LC's related to equipment projects, the Royalty Award, as defined in Note 4,Senior Term Loan did not exceed $70.0 million and certain other agreements. Additionally, this amendment collateralizedthe revision of covenants that were consistent with the Senior Term Loan covenants, including maintaining a minimum cash balance of $5.0 million.
As of December 31, 2020 and 2019, there were 0 outstanding borrowings under the Line of Credit with amounts due toCredit.
Note 12 - Leases
As of December 31, 2020 and 2019, the Company from an additional existing RChas obligations under finance leases of $5.5 million and $6.7 million, respectively, and obligations under operating leases of $3.0 million and $5.2 million, respectively. ROU assets under finance leases are mining equipment used at the Company’s lignite mine, which provides the key raw material for manufacturing the Company’s products. ROU assets under operating leases are primarily plant equipment used at the Company’s manufacturing facility, lease, which amountsbut also factor into the borrowing base limitation,include other office equipment, vehicles and amended certain financial covenants. Pursuant to the Tenth Amendment,office facilities. As of December 31, 2020 and 2019, the Company was required to maintain a deposit account withhas ROU assets, net of accumulated amortization, under finance leases of $2.4 million and $5.9 million and ROU assets, net of accumulated amortization, under operating leases of $1.9 million and $5.1 million, respectively.
Certain of the Lender, initially with a minimum balancefinance and operating leases have options permitting renewals for additional periods and buy-out options. Renewal and buy-out options for applicable leases have not been included in the measurement of $6.0 million, which was reduced to $3.0 million based onthe respective lease liabilities as the Company meetingis not reasonably certain conditionsthat it will exercise the respective option or the lessor does not have an exclusive right to exercise the option.
Finance leases
ROU assets under finance leases and maintaining minimum trailing twelve-month EBITDA (earnings before interest, taxes, depreciationfinance lease liabilities are included in Property, plant and amortization as definedequipment and Current portion and Long-term portion of borrowings, respectively, in the Tenth Amendment) of $24.0 million. The minimum deposit balance was classified as Restricted Cash on the Consolidated Balance Sheets as of December 31, 2016.2020 and 2019.
On September 30, 2017, ADA, as borrower,Interest expense related to finance lease liabilities and amortization of ROU assets under finance leases are included in Interest expense and Depreciation, amortization, depletion and accretion, respectively, in the Company, as guarantor, and the Lender entered into an amendment (the "Eleventh Amendment") to the LineConsolidated Statement of Credit. The Eleventh Amendment decreased the Line of Credit to $10.0 million due to decreased collateral requirementsOperations for the Company's outstanding LC's, extended the maturity date of the Line of Credit to September 30, 2018,years ended December 31, 2020 and permitted the Line of Credit to be used as collateral (in place of restricted cash) for LC's up to $8.0 million related to equipment projects, the Royalty Award2019.
Operating leases
ROU assets under operating leases and certain other agreements. Additionally, under the Eleventh Amendment there is no minimum balance requirement based on the Company meeting certain conditionsoperating lease liabilities are included in Other long-term assets and maintaining minimum trailing twelve-month EBITDA (earnings before interest, taxes, depreciationOther liabilities and amortization as definedOther long-term liabilities, respectively, in the Eleventh Amendment) of $24.0 million.
AsConsolidated Balance Sheets as of December 31, 2017, there were no outstanding borrowings under the Line of Credit, however, LC's in the aggregate amount of $3.5 million were secured under the Line of Credit, resulting in borrowing availability of $6.5 million2020 and LC availability of $4.5 million.2019.
76


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


Letters of Credit
The Company has LC's related to the Royalty Award (as described in Note 4), equipment projects, certain other agreements. During March 2017, a customer drew on an LC related to an equipment system in the amount of $0.8 million ("LC Draw"), which was funded by borrowing availability under the LOC. The Company subsequently repaid the LC Draw to the Lender as of March 31, 2017. The Company is contesting the LC Draw and is pursuing legal actions to recover the entire amount of the LC Draw from the customer. The Company recorded an assetLease expense for operating leases for the LC Draw netyear ended December 31, 2020 was $4.4 million, of estimated allowance of $0.4which $3.8 million which is included in Other assets onConsumables cost of revenue, exclusive of depreciation and amortization, and $0.6 million is included in General and administrative in the Consolidated Balance Sheets.
The following tables summarizeStatement of Operations for the LC's outstandingyear ended December 31, 2020. Lease expense for operating leases for the year ended December 31, 2019 was $4.4 million, of which $3.9 million is included in Consumables cost of revenue, exclusive of depreciation and collateral, by asset type, reported onamortization, and $0.5 million is included in General and administrative in the Consolidated Balance Sheets:Statement of Operations for the year ended December 31, 2019.
In August 2019, the Company entered into a new lease agreement covering approximately 21,000 square feet of office space for a term of 3.5 years and recorded an ROU asset of $1.2 million and a corresponding operating lease liability of $1.2 million.
  As of December 31, 2017
(in thousands) LC Outstanding Utilization of LOC Availability Restricted Cash
Royalty Award (1)
 $3,500
 $3,500
 $
Total LC outstanding $3,500
 $3,500
 $
Lease financial information as of and for the years ended December 31, 2020 and 2019 is provided in the following table:
Year ended December 31,
(in thousands)20202019
Finance lease cost:
Amortization of right-of-use assets$1,471 $2,149 
Interest on lease liabilities401 365 
Operating lease cost2,340 3,673 
Short-term lease cost2,067 771 
Variable lease cost (1)
163 371 
Total lease cost$6,442 $7,329 
Other Information:
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases$401 $365 
Operating cash flows from operating leases$2,200 $3,180 
Financing cash flows from finance leases$1,360 $1,354 
Right-of-use assets obtained in exchange for new finance lease liabilities$158 $
Right-of-use assets obtained in exchange for new operating lease liabilities$59 $1,309 
Weighted-average remaining lease term - finance leases3.5 years4.2 years
Weighted-average remaining lease term - operating leases1.8 years2.4 years
Weighted-average discount rate - finance leases6.2 %6.1 %
Weighted-average discount rate - operating leases8.5 %8.5 %
(1) As further discussed in Note 4, the Company settled the liability relatedPrimarily includes common area maintenance, property taxes and insurance payable to the Royalty Award on December 29, 2017. The Company and other parties associated with the LC, executed the termination of the LC in January 2018.lessors.

77

  As of December 31, 2016
(in thousands) LC Outstanding Utilization of LOC Availability Restricted Cash
Contract performance - equipment systems $1,855
 $1,776
 $86
Royalty Award 7,150
 
 7,150
Other 6,500
 
 6,500
Total LC outstanding $15,505
 $1,776
 $13,736

The following tables summarizes the expiration periods of the LC's based on the ultimate maturity date of the LC's as of December 31, 2017:
  Expiration of Letters of Credit as of December 31, 2017
(in thousands) Less than 1 year 1-3 years 4-5 years After 5 years
LC's $3,500
 $
 $
 $

Credit Agreement
On June 30, 2016, the Company, the required lenders and the administrative agent under a $15.0 million short-term loan (the "Credit Agreement") agreed to terminate the Credit Agreement prior to the maturity date of July 8, 2016, effective upon the Company’s prepayment on June 30, 2016 of $9.9 million, which was comprised of the total principal balance of the loan and advances made to or for the benefit of the Company, together with all accrued, but unpaid, interest and the total amount of all fees, costs, expenses and other amounts owed by the Company thereunder, including a prepayment premium.
The Lenders were beneficial owners of common stock in the Company. The Credit Agreement was approved by the Board and the Audit Committee as a related party transaction.
Tinuum Group - RCM6 Note Payable
The Company acquired a 24.95% membership interest in RCM6 from Tinuum Group in February 2014 through an up-front payment and the RCM6 Note Payable. Due to the payment terms of the note purchase agreement, the RCM6 Note Payable periodically added interest to the outstanding principal balance. The stated rate associated with the RCM6 Note Payable was 1.65% and the effective rate of the RCM6 Note Payable at inception was 20%. As discussed in Note 2, on March 3, 2016, the Company sold its 24.95% membership interest in RCM6 and, as a result, the Company has no future obligations related to the RCM6 Note Payable.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


The following table summarizes the Company's future lease payments under finance and operating leases as of December 31, 2020:
DSI Business Owner
(in thousands)Operating
Lease
Commitments
Finance
Lease
Commitments
Total Lease Commitments
2021$1,994 $1,859 $3,853 
2022748 1,008 1,756 
2023377 980 1,357 
20241,928 1,928 
2025569 569 
Thereafter
Total lease payments3,119 6,344 9,463 
Less: Imputed interest(127)(818)(945)
Present value of lease payments$2,992 $5,526 $8,518 
In February 2016,
Note 13 - Revenues
Contract Assets and Liabilities
Contract assets are comprised of unbilled receivables and are included in Receivables, net in the Consolidated Balance Sheets. Unbilled receivables represent a conditional right to consideration in exchange for goods or services transferred to a customer.
Trade receivables represent an unconditional right to consideration in exchange for goods or services transferred to a customer. The Company invoices its customers in accordance with the terms of the contract. Credit terms are generally net 30 from the date of invoice. The timing between the satisfaction of performance obligations and when payment is due from the customer is generally not significant. The Company records allowances for doubtful trade receivables when it is probable that the balances will not be collected.
Contract liabilities are comprised of deferred revenue, which represents an obligation to transfer goods or services to a customer for which the Company entered into an agreement to settle an outstanding note payable of approximately $1.1 million for $0.3 million withhas received consideration from the former owner of a business ("DSI Business Owner") acquired by the Company in 2012, which was paid during the first quarter of 2016. The Company recognized a gain related to the settlement of $0.9 million, whichcustomer and, if deliverable within one year or less, is included in the Other line itemcurrent liabilities in the Condensed Consolidated StatementsBalance Sheets and, if deliverable outside of Operationsone year, is included in Other long-term liabilities in the Consolidated Balance Sheets.
Trade receivables, net
The following table shows the components of Trade receivables, net:
 As of December 31,
(in thousands)20202019
Trade receivables$12,241 $8,057 
Less: Allowance for doubtful accounts(37)(627)
Trade receivables, net$12,204 $7,430 
During the years ended December 31, 2020 and 2019, the Company recognized 0 and $0.1 million, respectively, as bad debt expense related to specific accounts whose ultimate collection was in doubt.
Upfront Customer Consideration
As described in Note 3, as of September 30, 2020, the Company recorded an asset for Upfront Customer Consideration of $7.6 million in connection with the Supply Agreement. The amount is included in Other long-term assets, net on the Company's Consolidated Balance Sheet as of December 31, 2020. The Upfront Customer Consideration is being amortized on a straight-line basis as a reduction to revenue over the expected 15-year contractual period of the Supply Agreement.
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Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Disaggregation of Revenue and Earnings from Equity Method Investments
For the years ended December 31, 2020 and 2019, all performance obligations related to revenues recognized were satisfied at a point in time. The Company disaggregates its revenues by its major components as well as between its 2 operating segments, which are further discussed in Note 19 to the consolidated financial statements. The Company does not disaggregate revenue by geographic region as revenue is generated primarily from customers in the United States; however, in the APT segment for the year ended December 31, 2016.2020, approximately 15% of APT revenue was generated in Canada. The following tables disaggregate revenues by major source for the year ended December 31, 2020 and 2019 (in thousands):
Year ended December 31, 2020
Segment
(in thousands)APTRCTotal
Revenue component
Consumables$48,122 $$48,122 
License royalties, related party13,440 13,440 
Other15 15 
Revenues from customers48,137 13,440 61,577 
Earnings from equity method investments30,978 30,978 
Total revenues and earnings from equity method investments$48,137 $44,418 $92,555 
Year ended December 31, 2019
Segment
(in thousands)APTRCTotal
Revenue component
Consumables$53,187 $$53,187 
License royalties, related party16,899 16,899 
Revenues from customers53,187 16,899 70,086 
Earnings from equity method investments69,176 69,176 
Total revenues and earnings from equity method investments$53,187 $86,075 $139,262 
As further discussed in Note 19, as of December 31, 2020 the Company had a change in reportable segments. The Company has recast the segment information above for the year ended December 31, 2019 to be consistent with the new reportable segments as of December 31, 2020.
Note 414 - Commitments and Contingencies
Legal Proceedings
The Company is from time to time subject to, and is presently involved in, various pending or threatened legal actions and proceedings, including those that arise in the ordinary course of its business. Such matters are subject to many uncertainties and to outcomes, the financial impacts of which are not predictable with assurance and that may not be known for extended periods of time. The Company records a liability in its consolidated financial statements for costs related to claims, settlements, and judgments where management has assessed that a loss is probable, and an amount can be reasonably estimated. The Company’sCompany did not have any significant legal proceedings are discussed below.proceedings.
Securities class action lawsuit: United Food and Commercial Workers Union v. Advanced Emissions Solutions, Inc., No. 14-cv-01243-CMA-KMT (U.S. District Court, D. Colo.)
79

As of December 31, 2016, the Company had a recorded liability and insurance receivable of $4.0 million in connection with this lawsuit as the losses in connection with this matter were probable and reasonably estimable under U.S. GAAP. The liability was originally recorded as of June 30, 2016 in the Legal settlements and accruals line item of the Consolidated Balance Sheet. The Company's insurance carriers funded the full settlement in November 2016. On February 10, 2017, the Company received an order and final judgment that the lawsuit was settled, and the entire case had been dismissed with prejudice.

Stockholder derivative lawsuits: In Re Advanced Emissions Solutions, Inc. Shareholder Derivative Litigation, No. 2014CV-30709 (District Court, Douglas County, Colorado) (consolidated actions).
As of December 31, 2016, the Company had a recorded liability and insurance receivable of $0.6 million in connection with this lawsuit as the losses in connection with this matter were probable and reasonably estimable under U.S. GAAP. The liability was originally recorded as of June 30, 2016 in the Legal settlements and accruals line item of the Consolidated Balance Sheet. A settlement for this lawsuit was approved and the case was closed on January 4, 2017, and the Company's insurance carriers funded the full settlement in January 2017. As of March 31, 2017, the Company no longer had any amounts impacting its consolidated financial statements as the order and judgment related to the lawsuit was received during the first quarter of 2017.
SEC Inquiry
On March 29, 2017, the Company and the Securities and Exchange Commission reached a settlement to resolve a previously disclosed investigation into certain accounting issues, as described in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014. Without admitting or denying the SEC’s allegations, the Company agreed to the terms of the settlement and agreed to pay a civil monetary penalty of $0.5 million. The Company had fully reserved for this penalty as of June 30, 2016. The penalty was paid in the first quarter of 2017.
Settlement and Royalty Indemnity
In 2011, the Company and Norit International B.V. ("Norit") entered into a settlement agreement (the "Norit Settlement Agreement") whereby the Company paid amounts related to a non-solicitation breach of contract claim ("Norit Litigation"), and was also required to pay additional damages (the "Royalty Award") related to certain future revenues generated from an activated carbon manufacturing plant (the "Red River Plant") that the Company owned through a joint venture with ADA Carbon Solutions, LLC ("Carbon Solutions"). Payments due under the Royalty Award were due quarterly in arrears through June 2018. Additionally, in 2011, the Company entered into the Settlement Agreement Regarding ADA-ES’ Indemnity Obligations (the "Indemnity Settlement Agreement") whereby the Company agreed to settle certain indemnity obligations asserted against the Company related to the Norit Litigation and relinquished all of its equity interest in Carbon Solutions.
Under the Norit Settlement Agreement, the Company was required to pledge LC's as collateral for a portion of Royalty Award future payments due. In March 2017, the Company was required to increase its LC's under the Royalty Award based on a provision that required additional amounts be pledged because the Company had achieved annual earnings in excess of $20.0 million for the fiscal year ended December 31, 2016. Under this provision, the Company was required to provide an additional LC of $5.0 million, which was secured under the Line of Credit in March 2017. Under a separate provision of the Norit Settlement Agreement effective during 2017, the Company was required to increase the LC's, subject to the aggregate amount of estimated future payments due related to the Royalty Award, for any dividends issued by the Company prior to January 1, 2018 in amount equal to 50% of the aggregate fair market value of such dividends (the "Dividends Provision"). Based on the
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


estimated remaining future payments due under the Royalty Award, the Dividends Provision did not impact the amount of LC's pledged during 2017.
During the years ended December 31, 2017 and 2016, the Company revised its estimate for future Royalty Award payments based in part on updated forecasts provided to the Company from Carbon Solutions. These forecasts included significant reductions in estimated future revenues generated at the Red River Plant. Based primarily on these updated forecasts, the Company recorded reductions to the Royalty Award accrual of $3.4 million and $4.0 million for the years ended December 31, 2017 and 2016, respectively.
In December 2017, the Company, Carbon Solutions and the parent company of Carbon Solutions agreed to terminate certain provisions of the Indemnity Settlement Agreement (the " Indemnity Termination Agreement"). Pursuant to an agreement executed concurrently with the Indemnity Termination Agreement, the Company, Norit and an affiliate of Norit (collectively referred to as “Norit”) agreed to a final payment in the amount of $3.3 million (the "Settlement Payment") to settle all outstanding royalty obligations owed under the terms of the Norit Settlement Agreement. This amount was paid by the Company on December 29, 2017.
Under the Indemnity Termination Agreement, and upon payment of the Settlement Payment, the Company was relieved of certain financial and indemnity obligations required by the terms of the Norit Settlement Agreement, including the obligation to maintain LC's securing future royalty payment obligations. As of December 31, 2017, $3.5 million in LC's related to the Royalty Award were outstanding, but were canceled by all parties in January 2018, pursuant to the Indemnity Termination Agreement.Restricted Cash
As of December 31, 2016,2020, the Company carriedhad short-term restricted cash of $5.0 million as required under a minimum cash balance requirement of a Senior Term Loan covenant, and long-term restricted cash of $5.0 million as required under the components ofSurety Agreement related to the Royalty Award in Legal settlements and accruals in the Consolidated Balance Sheets of $5.7 million, and in Legal settlements and accruals, long-term of $5.4 million.Reclamation Contract.
The following table summarizes the Company's legal settlements and accruals as described above, which are presented in the Consolidated Balance Sheets:
  As of December 31,
(in thousands) 2017 2016
Settlement and Royalty Indemnification $
 $5,656
Legal settlements 
 5,050
Legal settlements and accruals, current 
 10,706
Settlement and Royalty Indemnification, long-term 
 5,382
Total legal settlements and accruals $
 $16,088
Surety Bonds
As of December 31, 2016,2020, the receivablesCompany had outstanding surety bonds of $36.7 million related to performance requirements under reclamation contracts associated with both the legal settlements above are shown with the Receivables, net line item in the Consolidated Balance Sheets in the same amounts as the respective liabilities.

Advanced Emission Solutions, Inc. Profit Sharing Retirement Plan

The Advanced Emissions Solutions, Inc. Profit Sharing Retirement Plan (the “401(k) Plan”) is subject to the jurisdiction of the Internal Revenue Service ("IRS")Five Forks Mine and the Department of Labor ("DOL"). The DOL opened an investigation into the 401(k) Plan, and the Company is responding to all requests for documents and information from the DOL. The DOL has not issued any formal findings as of the date of this filing. Although the Company believes there has been no breach of fiduciary duty with respect to the 401(k) Plan, the Company believes that it is probable that the DOL will require some payment to the 401(k) Plan in order to close the investigation.  The Company determined that this amount is reasonably estimable and, as such, the Company has accrued $1.0 million asMarshall Mine. As of December 31, 2017. The liability was recorded in2020, the Other current liabilities line itemCompany had restricted cash of $5.0 million securing the Surety Agreement and will be required to post an additional $5.0 million of restricted cash on the Consolidated Balance Sheets. The expense recognized related to this accrual was included in the Other line item in the Consolidated Statements of Operations for the year ended DecemberMarch 31, 2017. The estimate is based on information currently available and involves elements of judgment and significant uncertainties. As additional information becomes available and the resolution of the uncertainties becomes more apparent, it is possible that actual payment may exceed the accrued amount.2021.
Other Commitments and Contingencies
Tinuum Group
The Company also has certain limited obligations contingent upon future events in connection with the activities of Tinuum Group. The Company, NexGen and two entities affiliated with NexGen have provided GSFS with limited guaranties (the “Tinuum"Tinuum Group Party Guaranties”Guaranties") related to certain losses it may suffer as a result of inaccuracies or breach of representations and covenants. The Company also is a party to a contribution agreement with NexGen under which any party called upon to
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

pay on a Tinuum Group Party Guaranty is entitled to receive contribution from the other party equal to 50% of the amount paid. No liability or expense provision has been recorded by the Company related to this contingent obligation as the Company believes that it is not probable that a loss will occur with respect to Tinuum Group Party Guaranties.
Performance Guarantee on Equipment Systems
In the normal course of business related to ACI and DSI systems, the Company may guarantee certain performance thresholds during a discrete performance testing period that do not extend beyond six months from the initial test date, the commencement of which is determined by the customer. Performance thresholds include such matters as the achievement of a certain level of mercury removal and other emissions based upon the injection of a specified quantity of a qualified activated carbon or other chemical at a specified rate given other plant operating conditions, and availability of equipment and electric power usage. In the event the equipment fails to perform as specified during the testing period, the Company may have an obligation to correct or replace the equipment. In the event the performance thresholds are not achieved, the Company may have a “make right” obligation within the contract limits.
During 2015, the Company began working to modify and correct two performance guarantee issues related to EC systems that were installed during 2015. No revenue was recognized on these two contracts until the performance guarantees were resolved and contract obligations were substantially complete. During 2016, the Company passed performance testing on both systems and revenues on both systems were recognized. As a result of the resolution of the performance guarantees, the Company incurred approximately $0.9 million of costs on the ACI systems to pass the performance guarantees. During the year ended December 31, 2016, the Company satisfied all outstanding performance guarantees on its remaining ACI and DSI contracts and it did not incur any additional claims.
Purchase Obligations
The Company does not have any future purchase obligations as of December 31, 2017.
U.S. Department of Energy ("DOE") Audits
Certain of the Company's completed and current contracts awarded by the DOE and related industry participants remain subject to adjustments as a result of future government audits. The Company's historical experience with these audits has not resulted in significant adverse adjustments to amounts previously received; however the Company currently remains subject to audits for the years 2013 and later.
Operating Lease Obligations
The Company leases office, warehouse and laboratory space in Highlands Ranch, Colorado under operating leases. As of December 31, 2017, the Company leased approximately 17,344 square feet under two leases. Original lease terms ranged from four to seven years. Certain of these leases have options permitting renewals for additional periods. In addition to minimum fixed payments, a number of leases contain annual escalation clauses that are related to increases in the inflation index.
In December 2016, the Company entered into a lease termination related to its leased office space, in which the Company paid a $0.3 million lease termination fee. The lease termination was effective February 2017.
Also in December 2016, the Company entered into a new office lease in Highlands Ranch, Colorado effective February 2017.
Annual minimum commitments under the leases as of December 31, 2017 are as follows:
Years Ending December 31,
Operating
Lease
Commitments
(in thousands)
2018$298
2019205
202082
2021
Thereafter
Total$585
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Rent expense incurred for the years ended is as follows:
  Years Ended December 31,
(in thousands) 2017 2016 2015
Rent expense (1)
 $(60) $847
 $1,838
(1) During the year ended December 31, 2017, the Company accelerated deferred rent and tenant improvement allowances in connection with the termination of the lease agreement of its former corporate office.
Note 515 - StockholdersStockholders' Equity
The Company has two classes of capital stock authorized, common stock and preferred stock, which are described as follows:
Preferred Stock
The Company's Board of Directors (the "Board") is authorized to provide out of the unissued shares of Preferred Stock and to fix the number of shares constituting a series of Preferred Stock and, with respect to each series, to fix the number of shares and designation of such series, the voting powers, if any, the preferences and relative, participating, option or other special rights, if any, and any qualifications, limitations or restrictions thereof, of the shares of such series. As of December 31, 20172020 and 2016,2019, there were no0 shares of Preferred Stock designated or outstanding.
Common Stock
Holders of common stock are entitled to one1 vote for each share held of record on all matters submitted to a vote of the stockholders. Additionally, holders of common stock are entitled to receive dividends when and if declared by the Board, subject to any statutory or contractual restrictions on payment of dividends and to any restrictions on the payment of dividends imposed by the terms of any outstanding shares of preferred stock.
Upon dissolution, liquidation or the sale of all or substantially all of the Company's assets, after payment in full of any amounts required to be paid to creditors and to the holders of preferred stock having liquidation preferences, if any, the holders of shares of common stock will be entitled to receive the Company's remaining assets for distribution on a pro rata basis.
Stock Repurchase Programs
Tender Offer
On May 5, 2017,In November 2018, the Board authorized the commencement of a modified Dutch Auction tender offer ("Tender Offer") to purchase for cash up to 925,000 shares of the Company's common stock at a price per share of not less than $9.40 nor greater than $10.80, for a maximum aggregate purchase price of $10.0 million, with an option to purchase an additional 2% of the outstanding shares of common stock if the Tender Offer was oversubscribed. The Tender Offer expired on June 6, 2017 and a total of 2,858,425 shares were validly tendered and not properly withdrawn at or below the final purchase price of $9.40 per share.

Because the Tender Offer was oversubscribed, the Company purchased a prorated portion of the shares properly tendered by each tendering stockholder (other than "odd lot" holders whose shares were purchased on a priority basis) at the final per share purchase price. Accordingly, the Company acquired 1,370,891 shares of its common stock ("Tendered Shares") at a price of $9.40 per share, for a total cost of approximately $12.9 million, excluding fees and other expenses related to the tender offer. The Tendered Shares represented approximately 6.2% of the Company's outstanding shares prior to the tender offer. The Tendered Shares included the 925,000 shares the Company initially offered to purchase and 445,891 additional shares that the Company elected to purchase pursuant to its right to purchase up to an additional 2%$20.0 million of its outstanding shares of common stock. The Company recorded the Tendered Shares at cost, which included fees and expenses related to the Tender Offer, and reported the Tendered Shares as Treasury Stock on the Condensed Consolidated Balance Sheet as of December 31, 2017.

The Company’s Board and executive officers did not participate in the Tender Offer, except for one director of the Board, who is a manager of a financial institution and holds dispositive powers over the shares of the Company's common stock held by the financial institution that tendered 70,178 of its shares of the Company's common stock.
Stock Repurchase Program
During December 2017, and under a stock repurchase program authorized(the "Stock Repurchase Program"), which was to remain in effect until December 31, 2019 unless otherwise modified by the Board. As of November 2019, $2.9 million remained outstanding under the Stock Repurchase Program. In November 2019, the Board authorized an incremental $7.1 million to the Stock Repurchase Program and provided that it will remain in effect until all amounts are utilized or it is otherwise modified by the Board.
For the years ended December 31, 2020 and 2019, under the Stock Repurchase Program, the Company purchased 342,87520,613 and 533,345 shares of its common stock for cash of $3.4$0.2 million and $5.8 million, inclusive of commissions and fees, in open market transactions. Under the stock repurchase program,respectively. As of December 31, 2020, the Company is authorized to purchase up to $10.0had $7.0 million of its outstanding common stock. This stock repurchase program will remain in effect until December 31, 2018 unless otherwise modified byremaining under the Board.Stock Repurchase Program.
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Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


Quarterly Cash Dividend
Dividends declared and paid to holders of the Company's common shares during the years ended December 31, 2017, 20162020 and 2015December 31, 2019 were $15.7$4.6 million zero, and zero,$18.6 million, respectively. A portion of the dividends remains accrued subsequent to the payment dates and represents dividends accumulated on nonvested shares of common stock held by employees of the Company thatwhich contain forfeitable dividend rights thatwhich are not payable until the underlying shares of common stock vest. These amounts are included in both Other current liabilities and Other long-term liabilities onin the Condensed Consolidated Balance SheetSheets as of December 31, 2017.2020 and 2019.
Dividends declared and paid quarterly per share on all outstanding shares of common stock duringfor the yearyears ended December 31, 20172020 and 2019 were as follows:
 201720202019
 Per share Date paidPer shareDate paidPer shareDate paid
Dividends declared during quarter ended:   Dividends declared during quarter ended:
March 31March 31$0.25 March 10, 2020$0.25 March 7, 2019
June 30 $0.25
 July 17, 2017June 300.25 June 7, 2019
September 30 0.25
 September 7, 2017September 300.25 September 6, 2019
December 31 0.25
 December 6, 2017December 310.25 December 13, 2019
 $0.75
 $0.25 $1.00 
Tax Asset Protection Plan
United States federal income tax rules, and Section 382 of the IRC in particular, could substantially limit the use of net operating losses and other tax assets if ADES experiences an "ownership change" (as defined in the IRC). In general, an ownership change occurs if there is a cumulative change in the ownership of ADES by "5 percent stockholders" that exceeds 50 percentage points over a rolling three-year period.
On May 5, 2017, the Board approved the declaration of a dividend of rights to purchase Series B Junior Participating Preferred Stock for each outstanding share of common stock as part of a Tax Asset Protection Plantax asset protection plan (the "TAPP") designed to protect the Company’s ability to utilize its net operating losses and tax credits.
United States federal income tax rules, and Section 382 of the Internal Revenue Code in particular, could substantially limit the use of net operating losses and other tax assets if ADES experiences an “ownership change” (as defined in the Internal Revenue Code). In general, an ownership change occurs if there is a cumulative change in the ownership of ADES by "5 percent stockholders" that exceeds 50 percentage points over a rolling three-year period.
The Tax Asset Protection PlanTAPP is intended to act as a deterrent to any person acquiring beneficial ownership of 4.99% or more of the Company’s outstanding common stockstock.
On April 8, 2020, the Board approved the Third Amendment to the TAPP ("Third Amendment") that amended the TAPP, as previously amended by the First and will expireSecond Amendments that were approved the Board on April 6, 2018 and April 5, 2019, respectively. The Third Amendment amended the earlierdefinition of (a) May 4, 2018, or (b)"Final Expiration Date" under the dateTAPP to extend the duration of the 2018 Annual MeetingTAPP and makes associated changes in connection therewith. At the Company's 2020 annual meeting of Stockholders. The Tax Asset Protection Plan may alsostockholders, the Company's stockholders approved the Third Amendment, thus the Final Expiration Date will be terminated earlier in accordance with the terms thereof.close of business on December 31, 2021.
Note 616 - Stock-Based Compensation
The Plans

The Company currently has incentive plans, including the Amended and Restated 2010 Non-Management Compensation and Incentive Plan, as amended (the “2010 Plan”) and the 2017 Omnibus Incentive Plan (the “2017 Plan”) as described below. Collectively, these plans are called the “Stock Plans" and permit the Company to issue stock-based awards, including common stock, restricted stock, stock options and other rights and benefits under the plans to employees, directors and non-employees.

The 2010 Plan - During 2010, the Company adopted the 2010 Plan which permits grants of stock awards to employees, which may be shares, rights to purchase restricted stock, bonuses of restricted stock, or other rights or benefits under the plan. The Company reserved 600,000 shares of its common stock for these purposes. The Plan was amended and restated as of July 19, 2012 to make non-material changes to assure Internal Revenue CodeIRC Section 409A compliance. Upon the adoption of the 2017 Plan in June 2017, the Company no longer grants any awards from the 2010 Plan.


81


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

The 2017 Plan - During 2017, the Company adopted the 2017 Plan which permits grants of awards to employees, directors and non-employees, which may be shares, rights to purchase restricted stock, bonuses of restricted stock, or other rights or benefits under the plan. TheAs of December 31, 2020, the Company reserved 2,000,000has 1,135,112 shares of its common stock authorized for issuance under the 2017 Plan.

Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Expense

Restricted StockRSA's - Restricted stock isStock Awards ("RSA's") are typically granted with vesting terms of three or five years. The fair value of Restricted Stock Awards ("RSA's")RSA's is determined based on the closing price of the Company’s common stock on the authorization date of the grant multiplied by the number of shares subject to the stock award. Compensation expense for RSA's is generally recognized over the entire vesting periodterm on a straight-line basis.

Stock Options - Stock options generally vest over three years or upon satisfaction of performance-based conditions and have a contractual limit of five years from the date of grant to exercise. The fair value of stock options granted is determined on the date of grant using the Black-Scholes option pricing model and the related expense is recognized on a straight-line basis over the entire vesting period. The following table indicates the weighted-average assumptions that were used related to the stock options granted for the years ended December 31, 2016 and 2015, respectively. NoNaN stock options were granted during the yearyears ended December 31, 2017.
2020 and 2019.
  Years Ended December 31,
  2016 2015
Stock options granted:    
Risk-free interest rate 1.3% 1.8%
Dividend yield % %
Volatility 78.8% 74.5%
Expected term (in years) 2.6
 5.0
TheWhen options are granted, the Company uses historical data to estimate inputs used in the Black-Scholes option pricing model.

Risk-free interest rate - The risk-free interest rate for stock options granted during the period was determined by using a zero-coupon U.S. Treasury rate for the periods that coincided with the expected terms listed above.

Dividends - As historically no dividends had been paid as of the date by which grants occurred, no dividend yield was included in the calculations.calculations when the outstanding options were granted.

Expected volatility - To calculate expected volatility, the historical volatility of the Company's common stock was used.

Expected term - The Company’s expected term of options was based upon historical exercise behavior and consideration of the options' vesting and contractual terms.

RSU's - Restricted Stock Units ("RSU's") are typically granted with vesting terms of one year. The fair value of RSU's is determined based on the closing price of the Company’s common stock on the authorization date of the grant multiplied by the number of shares subject to the stock award. Compensation expense is generally recognized over the service period of the award on a straight-line basis.
Stock Appreciation RightsPSU's - Stock Appreciation RightsPerformance share units ("SAR's"PSU's") generally vest over three years and have a contractual limit of five years from the date of grant to exercise. The fair value of SAR's granted is determined on the date of grant using the Black-Scholes option pricing model and the related expense is recognized on a straight-line basis over the derived service period of the respective awards. During 2015, the Company granted a SAR award, and as settlement of the award was out of the control of the Company, the awards were classified as liability-based equity awards and were recorded at the estimated fair value at the grant and remeasured as a liability-based award as of each reporting period. This SAR award was converted to a stock option as of June 30, 2016 as discussed below. The following table indicates the weighted-average assumptions that were used related to the awards granted for the year ended December 31, 2015. No SAR's were granted during the year ended December 31, 2017 or 2016.
Year ended December 31,  
2015
SAR's granted:
Risk-free interest rate1.8%
Dividend yield%
Volatility74.5%
Expected term (in years)5.0

Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

The Company uses historical data to estimate inputs used in the Black-Scholes option pricing model.

Risk-free interest rate - The risk-free interest rate for SAR's granted during the period was determined by using a zero-coupon U.S. Treasury rate for the periods that coincided with the expected terms listed above.

Dividends - As historically no dividends have been paid as of the date by which grants occurred, no dividend yield was included in the calculations.

Expected volatility - To calculate expected volatility, the historical volatility of the Company's common stock was used.

Expected term - The Company’s expected term of SAR's was based upon consideration of the contractual term of the Company’s SAR's of 5 years.

PSU's - Performance share units ("PSU's") vestare based on the grantee’s continuous service with the Company, performance measures or a combination of both. Each PSU represents a contingent right to receive shares of the Company’s common stock if the Company meets certain performance measures over the requisite period. Vesting of the PSU's, if at all, occurs no later than January 2 after the conclusion of the third year of the performance period, subject to the grantee’s continuous service and the achievement of certain pre-established performance goals. Amounts vested are measured as of December 31, immediately prior to the end of the service period, unless the PSU's vest sooner at the target amount as a result of certain transactions pursuant to Section 11 of the Amended and Restated 2007 Equity Incentive Plan, as amended ("2007 Plan").

The number of shares of common stock a participant receives will be increased (up to 200 percent of target levels) or reduced (down to zero) based on the level of achievement of performance goals. The number of PSU's that may be earned by a participant is determined at the end of the performance period based on the relative placement of the Company’s total stockholder return (“TSR”) for that period with approximately 75% of the award based on the relative performance of the Company’s TSR performance compared to the respective TSRs of a specified group of peer companies and the remaining portion of the award based on the Company’s TSR performance compared to the Russell 3000 Index.

Compensation expense is recognized for PSU awards on a straight-line basis over a 3-year servicethe vesting period based on the estimated fair value at the date of grant using a Monte Carlo simulation model. The following table indicates the weighted-average assumptions thatNaN PSU's were used related to the awards granted forduring the year ended December 31, 2015. No PSU's were granted during the years ended December 31, 2017 or 2016.2019.
Year Ended December 31,
2015
PSUs granted:
Risk-free interest rate1.0%
Dividend yield%
Volatility64.3%
Performance period (in years)3.0

The Company uses historical data to estimate inputs used in the Monte Carlo pricing model.

Risk-free interest rate - The risk-free interest rate for PSU's granted during the period was determined by using a zero-coupon U.S. Treasury rate for the periods that coincided with the expected terms listed above.

Dividends - As historically no dividends had been paid as of the date by which grants occurred, no dividend yield was included in the calculations.

Expected volatility - To calculate expected volatility, the historical volatility of the Company's common stock was used.

Performance period - The Company’s performance period is based upon the vesting term of the Company’s PSU awards.

The Company recorded the following compensation expense related to the Stock Plans:
 Years Ended December 31,
(in thousands)20202019
RSA expense$2,304 $2,011 
PSU expense192 
Total stock-based compensation expense$2,496 $2,011 
82


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


The Company recorded the followingStock-based compensation expense related to the Stock Plansmanufacturing employees and the 2007 Plan:
  Years Ended December 31,
(in thousands) 2017 2016 2015
RSA expense $1,400
 $2,021
 $2,909
Stock option expense 672
 285
 658
SAR expense 
 106
 742
PSU expense 137
 456
 2,895
Total stock-based compensation expense $2,209
 $2,868
 $7,204
The Company recorded stock-based compensation expense related to awards to Directorsadministrative employees is included in the GeneralConsumables cost of revenue and administrative expense line and all other awards within the Payroll and benefit expense line in the Consolidated Statements of Operations.
During the years ended December 31, 2016 and 2015, the Company modified the terms of awards granted to 27 and 37 employees, respectively, in connection with its restructuring plans and termination of the impacted employees discussed in Note 18. These modifications resulted in the accelerated vesting and incremental expense related to certain performance-based awards and restricted stock awards. As a result, during 2016 and 2015 the Company recognized incremental stock-based compensation of $0.4 million and $3.4 million respectively, which was included in the Payroll and benefits line itemitems, respectively, in the Consolidated Statements of Operations. There were no material modificationsStock-based compensation expense related to awards duringnon-employee directors and consultants is included in the year ended December 31, 2017.General and administrative line item in the Consolidated Statement of Operations.

The amount of unrecognized compensation cost as of December 31, 2017,2020, and the expected weighted-average period over which the cost will be recognized is as follows:
 As of December 31, 2017As of December 31, 2020
(in thousands) Unrecognized Compensation Cost Expected Weighted-Average Period of Recognition (in years)(in thousands)Unrecognized Compensation CostExpected Weighted-Average Period of Recognition (in years)
RSA expense $1,735
 1.93RSA expense$1,788 1.60
Stock option expense 58
 0.25
PSU expense 
 0PSU expense117 2.19
Total unrecognized stock-based compensation expense $1,793
 1.88Total unrecognized stock-based compensation expense$1,905 1.62
Activity
Restricted Stock
A summary of the status and activity of non-vested RSA's and RSU's is presented in the following table:
 For the Years Ended December 31.
 2017 2016 2015
(in thousands, except for share and per share amounts)Shares Weighted-
Average
Grant Date
Fair Value
 Shares Weighted-Average
Grant-Date
Fair Value
 Shares Weighted-Average
Grant-Date
Fair Value
Non-vested at beginning of year297,347
 $8.03
 134,708
 $8.49
 209,921
 $13.59
Granted191,076
 $9.50
 363,758
 $7.46
 127,943
 $14.97
Vested(210,129) $8.03
 (175,956) $11.96
 (165,796) $17.51
Forfeited (1)
(1,687) $9.17
 (25,163) $15.58
 (37,360) $19.30
Non-vested at end of year276,607
 $9.03
 297,347
 $8.03
 134,708
 $8.49
(1) Included within the 2015 forfeited / canceled units are RSA's related to a former executive that were clawed back. The Company recognized $0.1 million within Other Income line item on the Consolidated Statement of Operations related to these awards.
Restricted StockWeighted-Average Grant Date Fair Value
(in thousands, except for share and per share amounts)AwardsUnitsRSA'sRSU's
For the year ended December 31, 2020
Non-vested at January 1, 2020451,344 $10.65 $
Granted315,383 $5.20 $
Vested(356,394)$9.41 $
Forfeited(36,473)$10.42 $
Non-vested at December 31, 2020373,860 $7.25 $
The weighted-average grant-dategrant date fair value of RSA's granted or modified during the years ended December 31, 2017, 2016,2020 and 20152019 was $1.8 million, $2.7 million,$5.20 and $1.9 million,$11.03, respectively. The total grant-date fair value of RSA's vested during the years ended December 31, 2017, 20162020 and 20152019 was $1.7 million, $2.1$3.4 million and $2.9$1.1 million, respectively. The aggregate intrinsic value of non-vested RSA's outstanding as of December 31, 2020 was $2.1 million.
Stock Options
A summary of option activity under the Stock Plans is presented below:
(in thousands, except for share and per share amounts)Number of
Options
Outstanding and
Exercisable
Weighted-
Average
Exercise
Price
Aggregate Intrinsic ValueWeighted-
Average
Remaining
Contractual
Term (in years)
For the year ended December 31, 2020
Options outstanding at January 1, 2020300,000 $13.87 
Options granted$
Options exercised$
Options expired / forfeited(300,000)$13.87 
Options outstanding at December 31, 2020$$— 
Options vested and exercisable at December 31, 2020$$— 
83


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Stock Options
A summary of option activity under the Plans is presented below:

(in thousands, except for share and per share amounts) Number of
Options
Outstanding and
Exercisable
 Weighted-
Average
Exercise
Price
 Aggregate Intrinsic Value Weighted-
Average
Remaining
Contractual
Term (in years)
For the year ended December 31, 2015        
Options outstanding, January 1, 2015 74,200
 $13.76
    
Options granted 56,250
 $13.87
    
Options exercised 
 $
    
Options expired / forfeited (24,200) $7.59
    
Options outstanding, December 31, 2015 106,250
 $15.22
 $
 3.8
Options vested and exercisable, December 31, 2015 82,915
 $14.04
 $
 3.9
         
For the year ended December 31, 2016        
Options outstanding, January 1, 2016 106,250
 $15.22
    
Options granted (1)
 546,196
 $11.10
    
Options exercised 
 $
    
Options expired / forfeited (20,000) $16.90
    
Options outstanding, December 31, 2016 632,446
 $11.61
 $183
 4.0
Options vested and exercisable, December 31, 2016 247,780
 $13.30
 $69
 3.4
         
For the year ended December 31, 2017        
Options outstanding, January 1, 2017 632,446
 $11.61
    
Options granted 
 $
    
Options exercised 
 $
    
Options expired / forfeited (10,000) $9.77
    
Options outstanding, December 31, 2017 622,446
 $11.64
 $119
 2.24
Options vested and exercisable, December 31, 2017 429,780
 $11.47
 $119
 2.03
(1)Included in options granted are 243,750 awards granted that were initially granted on a contingent basis and became exercisable as a result of the automatic expiration of the same number of SAR's, as a result of stockholder approval of Amendment No. 4 of the 2007 Plan. See "SAR's" section below for a discussion of the provisions of the exchange and incremental expense recognized.
The weighted-average grant-date fair value of options granted during the years ended December 31, 2017, 2016, and 2015 was zero, $0.5 million, and $0.8 million, respectively. There were no options exercised during the years ended December 31, 2017, 2016 and 2015. The weighted-average grant-date fair value of options vesting during the years ended December 31, 2017, 2016,2020 and 20152019 was $0.70 and 0, respectively. The weighted-average grant-date fair value of options exercised during the year ended December 31, 2020 and 2019 was 0 and $0.6 million, $0.5respectively. The Company received proceeds of $0.2 million and $0.7 million, respectively.

from the exercise of stock options during the year ended December 31, 2019.
Cash flows resulting from excess tax benefits, if any, are classified as part of cash flows from financing activities. Excess tax benefits are realized tax benefits from tax deductions for vested RSA's settled PSU's and exercised options in excess of the deferred tax asset attributable to stock compensation costs for such equity awards. The Company recorded no0 excess tax benefits for the years ended December 31, 2017, 2016,2020 and 2015.

During 2015, approximately $0.5 million of stock-based compensation expense was recognized as a result of granting an executive officer stock options which were immediately vested, with an exercise price of $13.87 per option.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

SAR's
A summary of SAR activity under the Plans is presented below:
(in thousands, except for share and per share amounts) Number of
SAR's
Outstanding and
Exercisable
 Weighted-
Average
Exercise
Price
 Aggregate Intrinsic Value Weighted-
Average
Remaining
Contractual
Term (in years)
For the year ended December 31, 2015        
SAR's outstanding, January 1, 2015 
 $
    
Granted 243,750
 $13.87
    
Exercised 
 $
    
Expired / forfeited 
 $
    
SAR's outstanding, December 31, 2015 243,750
 $13.87
 $
 4.5
SAR's vested and exercisable, December 31, 2015 43,750
 $13.87
 $
 
         
For the year ended December 31, 2016        
SAR's outstanding, January 1, 2016 243,750
 $13.87
 

  
Granted 
 $
 
  
Exercised 
 $
 
  
Expired / forfeited (243,750) $13.87
 
  
SAR's outstanding, December 31, 2016 
 $
 $
 
SAR's vested and exercisable, December 31, 2016 
 $
 $
 
In June 2016, the Company's stockholders approved Amendment No. 4 to the 2007 Plan, which triggered an automatic expiration of the SAR's and an equal number of stock options being exercisable and no longer granted on a contingent basis. Upon approval, all existing SAR's expired under this provision. The Company recorded incremental expense of $0.1 million to stock-based compensation related to the change in fair value of the SAR's prior to the reclassification date. Upon reclassification, the impact to Additional paid-in capital was a $0.9 million increase. The Company had no SAR's outstanding as of December 31, 2017.2019.
PSU's
A summary of the status and activity of non-vested PSU's is presented in the following table:
  For the Years Ended December 31.
  2017 2016 2015
(in thousands, except for unit and per unit amounts) Units Weighted-Average
Grant-Date
Fair Value
 Units Weighted-Average
Grant-Date
Fair Value
 Units Weighted-Average
Grant-Date
Fair Value
Non-vested at beginning of year 49,516
 $25.20
 169,334
 $26.38
 142,357
 $30.65
Granted (1)
 
 $
 
 $
 69,218
 $20.10
Vested (1)
 (30,110) $26.87
 (119,818) $26.87
 (13,763) $30.52
Forfeited / Canceled (1) (2)
 
 $
 
 $
 (28,478) $30.44
Non-vested at end of year 19,406
 $19.95
 49,516
 $25.20
 169,334
 $26.38
(1) The number of units shown in the table above are based on target performance. The final number of shares of common stock issued may vary depending on the achievement of market conditions established within the awards, which could result in the actual number of shares issued ranging from zero to a maximum of two times the number of units shown in the above table.
(2) Included within the 2015 forfeited / canceled units are PSU's related to a former executive that were clawed back. The Company recognized $0.2 million within Other Income line item on the Consolidated Statement of Operations related to these awards.
The weighted-average grant date fair value of PSU's granted during the years ended December 31, 2017, 2016, and 2015 was zero, zero, and $1.4 million, respectively. The PSU's granted willoutstanding remain unvested until the third anniversary date of their
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

issuance date, at which time the actual number of vested shares will be determined based upon the actual price performances of the Company’s common stock relative to a broad stock index and a peer group performance index.
The following table shows the PSUs that were settled by issuing the Company's common stock relative to a peer group performance index and broad stock index.
  Year of Grant Net Number of Issued Shares upon Vesting Shares Withheld to Settle Tax Withholding Obligations TSR Multiple Range Russell 3000 Multiple
     Low High Low High
For the year ended December 31, 2017              
  2014 6,476
 3,573
 0.75
 1.00
 
 
  2015 3,869
 2,310
 0.60
 0.60
 
 
For the year ended December 31, 2016              
  2013 38,706
 1,572
 0.63
 1.00
 
 
  2014 11,487
 
 0.63
 0.63
 
 
  2015 13,529
 
 0.50
 0.50
 
 
For the year ended December 31, 2015              
  2013 8,768
 3,954
 1.75
 1.75
 2.00
 2.00
  2014 2,506
 1,145
 0.63
 0.75
 
 0.75
Note 7 - Property and Equipment
The carrying basis and accumulated depreciationA summary of property and equipment at December 31, 2017 and 2016 are:
  
Life in
Years
 As of December 31,
(in thousands) 2017 2016
Machinery and equipment 2-7 $1,429
 $1,634
Leasehold improvements 3 205
 1,244
Furniture and fixtures 3-7 262
 777
    1,896
 3,655
Less accumulated depreciation and amortization   (1,486) (2,920)
Total property and equipment, net   $410
 $735
Depreciation expensePSU activity for the years ended December 31, 2017, 2016 and 2015 was $0.7 million, $0.9 million and $1.7 million, respectively.
During the year ended December 31, 2016, the Company recorded impairments totaling approximately $0.5 million to reduce the carrying value of certain property and equipment that the Company intended to sell at its estimated sales value, less estimated costs to sell. The property and equipment was subsequently sold at auction. No gain or loss was recognized on the sale of the property and equipment.2020 is presented below:
During
UnitsWeighted-Average
Grant Date
Fair Value
Aggregate Intrinsic Value (in thousands)Weighted-Average
Remaining
Contractual
Term (in years)
PSU's outstanding, December 31, 2020
PSU's outstanding, January 1, 2020$
Granted50,127 6.17 
Vested / Settled
Forfeited / Canceled
PSU's outstanding, December 31, 202050,127 $6.17 $2.19
There were 0 PSU's granted during the year ended December 31, 2016, the Company accelerated depreciation of approximately $0.2 million related to property and equipment that will be no longer be in service due to the lease termination described in Note 4.2019.
84


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Note 8 - Costs and Billings on Uncompleted Contracts
Costs incurred on uncompleted contracts represent the gross costs as of the balance sheet dates. Billings on uncompleted contracts represent the gross billings as of the balance sheet dates. Costs and billings are netted on an individual contract basis, with contracts in a net cost position aggregated and presented as Costs in excess of billings on uncompleted contracts in the Consolidated Balance Sheets, and contracts in a net billing position aggregated and presented as Prepaid expenses and other assets in the Consolidated Balance Sheets. The below table shows the components of these items:

  As of December 31,
(in thousands) 2017 2016
Costs incurred on uncompleted contracts (gross) $15,945
 $42,993
Billings on uncompleted contracts (gross) (17,775) (47,915)
  $(1,830) $(4,922)
Included in the accompanying balance sheets under the following captions (1):
    
Costs in excess of billings on uncompleted contracts (2)
 $
 $25
Billings in excess of costs on uncompleted contracts (1,830) (4,947)

 $(1,830) $(4,922)
(1) Amounts presented after netting of costs and billings on an individual contract basis.
(2) Costs in excess of billings on uncompleted contracts is included in the Prepaid expenses and other assets caption on the Consolidated Balance Sheets.
When the Company determines that a contract will ultimately be completed at a loss, the Company estimates such loss and accrues the loss as a loss contract accrual in the period that the loss determination is made. Loss contract accruals of $0.1 million and $0.2 million as of December 31, 2017 and 2016, respectively, are included in Other current liabilities line item in the Consolidated Balance Sheets. During the years ended December 31, 2017, 2016 and 2015, the Company recorded loss contract provisions of $0.1 million, $0.4 million and $0.3 million, respectively. Loss contract provisions are included within the Equipment sales cost of revenue, exclusive of depreciation and amortization line item in the Consolidated Statements of Operations.
Note 9 - Research and Development and Government and Industry Funded Contracts
Research and development expense consists of research relating to continued product development for the Company’s ongoing business and various other projects, including the CO2 capture and control market. The Company historically entered into certain development and cost-sharing contracts with the DOE and generally included industry cost-share partners to offset the costs incurred that are anticipated to be in excess of funded amounts from the DOE. Contracts with the DOE can take the form of grants or cooperative agreements and are considered financial assistance awards. The deliverables required by the DOE agreements include various technical and financial reports that the Company submits on a prescribed schedule. The agreements require the Company to perform the negotiated scope of work in agreed phases, which includes testing and demonstration of technologies.
The Company typically invoices the DOE and industry cost-share partners monthly for labor and expenditures plus estimated overhead factors, less any cost share amounts. The contracts under which the Company has performed are subject to audit, the result of which may require the Company to reimburse the DOE for disallowed costs and other adjustments. The Company has not experienced any material adverse adjustments as a result of completed government audits. However, the potential government audits for years ended 2013 through 2015 have not yet been finalized. The following table shows the impact to Research and development expense amounts recognized in the Consolidated Statement of Operations:
  Years Ended December 31,
(in thousands) 2017 2016 2015
Research and development expense $979
 $173
 $6,737
Less:      
Changes due to amount and timing of ARO reclamation 822
 
 
DOE funding 
 821
 1,375
Research and development expense, net $157
 $(648) $5,362
Included within the above research and development expenses during 2015 is net impairment expense of $1.9 million for the entire carrying value of the Company's ADA Analytics Israel Ltd's ("ADA Analytics") assets, as discussed in Note 17 and Note 18.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Note 1017 - Supplemental Financial Information
Supplemental Balance Sheet Information
The following table summarizes the components of Prepaid expenses and other current assets and Other long-term assets, net as presented in the Consolidated Balance Sheets:
 As of December 31,
(in thousands)20202019
Prepaid expenses and other current assets:
Prepaid expenses$1,690 $1,708 
Prepaid income taxes1,605 4,228 
Other1,302 1,896 
$4,597 $7,832 
Other long-term assets:
Upfront customer consideration (1)
$7,490 $
Cabot receivable (1)
8,852 
Right of use assets, operating leases, net1,930 5,073 
Spare parts, net3,727 3,453 
Mine development costs, net4,338 7,084 
Mine reclamation asset, net1,712 2,451 
Highview investment552 552 
Other long-term assets1,388 1,718 
$29,989 $20,331 
  As of December 31,
(in thousands) 2017 2016
Other current assets:    
Prepaid expenses $1,678
 $1,169
Inventory 74
 16
Costs in excess of billings 
 25
Other 83
 172
  $1,835
 $1,382
Other long-term assets:    
Deposits $223
 $263
Intangibles 805
 696
Cost method investment 552
 1,016
Other long-term assets 728
 323
  $2,308
 $2,298
(1) See further discussion of Upfront Customer Consideration in Note 3 and Cabot receivable in Note 4.
Spare parts include critical spares required to support plant operations. Parts and supply costs are determined using the lower of cost or estimated replacement cost. Parts are recorded as maintenance expenses in the period in which they are consumed.
Mine development costs include acquisition costs, the cost of other development work and mitigation costs related to the Five Forks Mine and are depleted over the estimated life of the related mine reserves, which is 16 years. The Company performs an evaluation of the recoverability of the carrying value of mine development costs to determine if facts and circumstances indicate that their carrying value may be impaired and if any adjustment is warranted. Mine reclamation asset represents the ARO asset related to the Five Forks Mine and is depreciated over its estimated life.
The Company's cost methodCompany holds a long-term investment relates to its investment(the "Highview Investment") in Highview Enterprises Limited ("Highview")., a London, England based developmental stage company specializing in power storage. In November 2014, the Company acquired an 8% ownership interest in the common stock of Highview for $2.8 million in cash (the "Highview Investment").cash. The Company evaluatedaccounts for the Highview Investment and determined that it should accountas an investment recorded at cost, less impairment, plus or minus observable changes in price for identical or similar investments of the investment under the cost method.same issuer.
The Highview Investment is evaluated for impairment upon an indicatorindicators of impairment such as an event or change in circumstances that may have a significant adverse effect on the fair value of the investment. As of December 31, 2016, the Company recorded an impairment charge of $1.8 million based on an estimated fair value of £2.00 per share, comparedThere were no changes to the carrying value prior to the impairment charge of £4.25 per share. The estimated fair value as of December 31, 2016 was based on an equity raise that was completed during the first quarter of 2017 at a price of £2.00 per share.
During the year ended December 31, 2017, the Company recorded an impairment charge of $0.5 million, which is included in the Other line item in the Consolidated Statement of Operations, based on an estimated fair value of £1.00 per share, compared to the carrying value prior to the impairment charge of £2.00 per share. The estimated fair value as of December 31, 2017 was based on an equity raise that commenced during the third quarter of 2017 at a price of £1.00 per share.
The following table details the components of the Company's intangible assets:
  As of December 31,
  2017 2016
(in thousands, except years) Initial Cost Net of Accumulated Amortization Initial Cost Net of Accumulated Amortization
Patents $1,079
 $805
 $913
 $696
Licensed technology 
 
 1,525
 
Total $1,079
 $805
 $2,438
 $696
Included in the Consolidated Statements of Operations is amortization expense related to intangible assets of $0.1 million, $0.1 million and $0.4 millionHighview Investment for the years ended December 31, 2017, 20162020 and 2015, respectively. The estimated future amortization expense2019 as there were no indicators of impairment or observable price changes for existing intangible assets as of December 31, 2017 is expected to be $0.1 million for each ofequity issued by Highview. Since the five succeeding fiscal years.
During the year ended December 31, 2016,purchase date, the Company entered into an agreement with Highview to terminate a license agreement (the "Highview License") to certain technology ("Licensed Technology") in exchange for a one-time payment by the Companyhas recognized $2.2 million of £0.2 million (approximately $0.2 million). Under the termination, payment of the termination fee, if any, will only be settled by relinquishing shares of Highview currently owned by the Company equal to £0.2 million. As a result of terminatingcumulative impairment losses on the Highview License, the Company wrote off the Licensed Technology, reduced the corresponding long-termInvestment.
85


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


liability ("Highview Obligation") to the amount of the one-time payment, and recognized a gain of approximately $0.2 million. The gain on the settlement of the Highview Obligation is included in the Other income line on the Company's Consolidated Statement of Operations for the year ended December 31, 2016.

The following table details the components of Other current liabilities and Other long-term liabilities as presented in the Consolidated Balance Sheets:
  As of December 31,
(in thousands) 2017 2016
Other current liabilities:    
Estimated Company contribution to 401(k) Plan $1,000
 $
Accrued interest 
 618
Accrued losses on equipment contracts 69
 183
Taxes payable 207
 244
Deferred revenue 
 76
Warranty liabilities 316
 287
Deferred rent 
 369
Asset retirement obligation 
 1,312
Other 1,072
 928
  $2,664
 $4,017
Other long-term liabilities:    
Deferred revenue, related party $2,000
 $2,000
Deferred rent 192
 38
Other long-term liabilities 93
 
  $2,285
 $2,038
 As of December 31,
(in thousands)20202019
Other current liabilities:
Current portion of operating lease obligations$1,883 $2,382 
Accrued interest69 213 
Income and other taxes payable1,305 678 
Current portion of mine reclamation liability9,370 
Other current liabilities369 1,038 
$12,996 $4,311 
Other long-term liabilities:
Operating lease obligations, long-term$1,109 $2,810 
Mine reclamation liabilities12,077 2,721 
Other287 229 
$13,473 $5,760 
The tables below detail components ofMine reclamation liability related to the Five Forks Mine is included in Other long-term liabilities. The Mine reclamation liability related to Marshall Mine, which was assumed in the Marshall Mine Acquisition is included in Other current liabilities as presented above:

and Other long-term liabilities. The changes in the carrying amount of the Company’s warranty obligations were as follows:
  As of December 31,
(in thousands) 2017 2016
Balance, beginning of year $287
 $1,197
Warranties accrued, net 580
 89
Warranty claims (635) (899)
Change in estimate related to previous warranties accrued 84
 (100)
Balance, end of year $316
 $287

Included within Other currentMine reclamation liabilities is the Company's asset retirement obligation.represent AROs. Changes in the Company's asset retirement obligationAROs were as follows:
As of December 31,
(in thousands)20202019
Asset retirement obligations, beginning of year$2,721 $624 
Asset retirement obligations assumed21,328 1,776 
Accretion543 205 
Liabilities settled(3,565)(78)
Changes due to scope and timing of reclamation420 194 
Asset retirement obligations, end of year21,447 2,721 
Less current portion9,370 
Asset retirement obligations, long-term$12,077 $2,721 
86

  As of December 31,
(in thousands) 2017 2016
Asset retirement obligation, beginning of year $1,312
 $1,248
Accretion 37

64
Liabilities settled (527)

Changes due to scope and timing of reclamation (822)

Asset retirement obligations, end of year $

$1,312


The Company settled its asset retirement obligation during the year ended December 31, 2017 for less than its estimate as the scope of the asset retirement obligation was reduced. The change in estimate was recorded within the Research and
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


development, net line item of the Consolidated Statements of Operations as the asset retirement obligation related to a research project of which expenses were originally recorded within the same line item.

Supplemental Consolidated Statements of Operations Information
Gain on Settlement
On December 29, 2020, the Company and a former customer (the "Parties") reached a settlement (the "Settlement") on various litigation matters (the "Litigation Matters") that resulted in the former customer (the "Former Customer") agreeing to pay to the Company cash of $2.5 million (the "Settlement Amount"), which was received on January 27, 2021. This payment was in exchange for full dissolution of all claims and counterclaims that the two Parties have asserted or could have asserted against each other in the Litigation Matters, or which have arisen or may arise against each other but are presently unknown, arising out of or related to the Litigation Matters and related to any other of the Parties’ business dealings, conduct and/or transactions through the date of the Settlement, including all claims for damages, fees, costs, sanctions, or any other amounts due or to become due in connection with the foregoing.
The Company applied the Settlement Amount cash proceeds to both an outstanding trade account receivable and note receivable due from the Former Customer and recognized the excess cash received as a gain on the Settlement of $1.1 million, which is reported as a component of operating expenses in the Consolidated Statements of Operations for the year ended December 31, 2020. The gain on settlement impacted operating income for the quarterly period ended December 31, 2020.


The following table details the components of Interest expense in the Consolidated Statements of Operations:
 Years Ended December 31,Years Ended December 31,
(in thousands) 2017 2016 2015(in thousands)20202019
Interest on Senior Term LoanInterest on Senior Term Loan$1,708 $4,112 
Debt discount and debt issuance costsDebt discount and debt issuance costs1,418 1,678 
453A interest $2,555
 $2,490
 $4,639
453A interest331 1,039 
Line of Credit interest and letters of credit fees 417
 89
 49
Credit Agreement interest 
 2,112
 1,180
Interest on RCM6 Note Payable, related party 
 263
 2,468
Other 52
 112
 66
Other463 345 
 $3,024
 $5,066
 $8,402
$3,920 $7,174 
The following table details the components of Other in the Consolidated Statements of Operations:
Years Ended December 31,
(in thousands)20202019
Interest income$127 $261 
Other166 
$132 $427 
87
  Years Ended December 31,
(in thousands) 2017 2016 2015
Impairment of cost method investment $(464) $(1,760) $
Settlement agreement(1)
 3,500
 


Estimate of Company contribution to 401(k) Plan (1,000) 
 
Gain on sale of equity method investment 
 2,078
 
Gain on settlement of note payable and licensed technology 
 1,019
 
Gain on termination of sales-type lease 
 891
 
Other (11) 235
 494
  $2,025
 $2,463
 $494
(1) On November 6, 2017, the Company entered into a settlement agreement with a former third-party service provider and as part of the settlement the Company received cash in the amount of $3.5 million. This amount was paid to the Company during the fourth quarter of 2017.
Note 11 - Fair Value Measurements
Fair Value of Financial Instruments
The carrying amounts of financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, deposits and accrued expenses, approximate fair value due to the short maturity of these instruments. Accordingly, these instruments are not presented in the table below. The following table provides the estimated fair values of the remaining financial instruments:



  As of December 31, 2017 As of December 31, 2016
(in thousands) Carrying Value Fair Value Carrying Value Fair Value
Financial Instruments:        
Highview Investment $552
 $552
 $1,016
 $1,016
Highview Obligation $210
 $210
 $207
 $207

Concentration of credit risk
As of December 31, 2017, the Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents. The Company holds cash and cash equivalents at one financial institution as of December 31, 2017. If that institution was to be unable to perform its obligations, the Company would be at risk regarding the
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


Note 18 - Income Taxes
amount of investment in excessThe provision for income taxes consists of the federal deposit insurance corporation limits ($250 thousand)following:
 Years Ended December 31,
(in thousands, except for rate)20202019
Current portion of income tax expense:
Federal$1,666 $2,133 
State and other1,354 1,211 
3,020 3,344 
Deferred portion of income tax expense (benefit):
Federal5,068 10,491 
State and other(1,577)(1,836)
3,491 8,655 
Total income tax expense$6,511 $11,999 
Effective tax rate(47)%25 %
Income tax expense differs from the amount that would be returned tocomputed by applying the Company.

Assets and Liabilities Measured at Fair Value on a Recurring Basis
AsU.S. statutory federal income tax rate of December 31, 2017 and December 31, 2016, the Company had no financial instruments carried and measured at fair value on a recurring basis.

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
As discussed in Note 10, during21% for the years ended December 31, 20172020 and 2016, the Company recorded impairment charges approximately $0.5 million and $1.8 million, respectively,2019 to reduce the carrying valueincome before income taxes as a result of the Highview Investment to its estimated fair value.following:
During 2016, the Company recorded impairments totaling approximately $0.5 million to reduce the carrying value of certain property and equipment that the Company intended to sell at its estimated sales value, less estimated costs to sell. The property and equipment was subsequently sold at auction. Proceeds from the sale of the impaired assets totaled approximately $0.1 million. No gain or loss was recognized on the sale of the property and equipment. Additionally, the Company recorded an impairment of approximately $0.8 million included within Equipment sales cost of revenue for the year ended December 31, 2016.
 Years Ended December 31,
(in thousands)20202019
Federal statutory rate$(2,896)$10,027 
State income taxes, net of federal benefit(410)1,597 
Permanent differences326 286 
Tax credits(417)(338)
Valuation allowances9,148 (288)
Changes in tax rates(97)229 
Stock-based compensation285 112 
Return to provision and other true-ups572 138 
UTP liability236 
Expense for the provision for income taxes$6,511 $11,999 
During December 2014 and March 2015, the Company loaned to an independent technology development company exploring energy storage a total of $1.0 million to provide financing to pursue emissions technology projects. This note bore annual interest of 8%, and interest and principal were payable at maturity in March 2018. Based on uncertainty of collectability, the Company recorded an allowance against the entire principal balance reversed accrued interest and put the note on non-accrual status as of December 31, 2015.
88

The fair value measurements represent Level 3 measurements as they are based on significant inputs not observable in the market.

Note 12 - Income Taxes
On December 22, 2017 (the "Enactment Date"), the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). The Tax Act makes broad and complex changes to the U.S. tax code and key provisions applicable to the Company, or certain of Tinuum Group's existing or potential customers, for 2018 include the following: (1) reduction of the U.S. federal corporate tax rate from 35 percent to 21 percent; (2) elimination of the corporate alternative minimum tax (AMT); (3) a new limitation on deductible interest expense; (4) limitations on the deductibility of certain executive compensation; (5) limitations on the use of federal tax credits ("FTCs") to reduce the U.S. income tax liability; (6) limitations on net operating losses (“NOL’s”) generated after December 31, 2017, to 80 percent of taxable income; and the introduction of the Base Erosion Anti-Abuse Tax (“BEAT”) for tax years beginning after December 31, 2017.
Concurrent with the enactment of the Tax Act, in December 2017, the SEC staff issued Staff Accounting Bulletin 118 ("SAB 118"), which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Enactment Date for companies to complete the accounting under Accounting Standards Codification 740 - Income Taxes ("ASC 740"). In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 is complete. To the extent that an entity's accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act.
The Company's accounting for the income tax effects of the Tax Act affecting its consolidated financial statements as of December 31, 2017 is generally complete, subject to continued evaluation under SAB 118, and as such, the Company recorded an adjustment to its recorded deferred tax assets and deferred tax liabilities as of the Enactment Date from 35 percent to 21 percent. Accordingly, the Company has recorded a reduction of $5.8 million to its net deferred tax asset as of December 22, 2017 with a corresponding entry to deferred tax expense for the year ended December 31, 2017 for those temporary differences expected to reverse after the Enactment Date. The Company does not anticipate any other accounting impacts of the Tax Act during the period within one year from the Enactment Date however, it will continue to assess any potential impact from the Tax Act through this period.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

The provision for income taxes consists of the following:

  Years Ended December 31,
(in thousands, except for rate) 2017 2016 2015
Current portion of income tax expense:      
Federal $519
 $
 $
State 894
 458
 20
  1,413
 458
 20
Deferred portion of income tax (benefit) expense:      
Federal 23,003
 (61,396) 
State (264) 
 

 22,739
 (61,396) 
Total income tax (benefit) expense $24,152
 $(60,938) $20
Effective tax rate 46% (166)% %
A reconciliation of expected federal income taxes on income from operations at statutory rates with the expense (benefit) for income taxes is as follows:
  Years Ended December 31,
(in thousands) 2017 2016 2015
Federal statutory rate $18,209
 $12,859
 $(10,542)
State income taxes, net of federal benefit 1,721
 987
 (781)
Permanent differences 777
 84
 35
Tax credits (1,949) (2,419) (38,998)
Valuation allowances (474) (72,359) 50,066
Changes in tax rates 5,818
 (125) (243)
Stock-based compensation 303
 36
 487
Other (253) (1) (4)
Expense (benefit) for the provision for income taxes $24,152
 $(60,938) $20
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Deferred income taxes are provided for the effects of temporary differences between the tax basis of an asset or liability and itstheir reported amountamounts in the accompanying Consolidated Balance Sheets. These temporary differences result in taxable or deductible amounts in future years. Details of the Company’s deferred tax assets and liabilities are summarized as follows:
  As of December 31,
(in thousands) 2017 2016
Deferred tax assets    
Tax credits $100,367
 $99,903
Deferred revenues and loss contract provisions 906
 268
Employee related liabilities 393
 3,796
Intangible assets 914
 1,518
Equity method investments 8,457
 12,326
Net operating loss carryforwards 2,004
 13,341
Settlement and Royalty Indemnification 
 4,264
Other investments 563
 680
Other 648
 1,429
Total deferred tax assets 114,252
 137,525
Less valuation allowance (75,436) (75,910)
Deferred tax assets 38,816
 61,615
Less: Deferred tax liabilities    
Property and equipment and other (155) (219)
Total deferred tax liabilities (155) (219)
Net deferred tax assets $38,661
 $61,396
For 2017, the Company recorded an income tax expense of $24.2 million compared to an income tax benefit of $60.9 million for 2016. The income tax expense for the year ended December 31, 2017 was primarily related to federal and state taxes of $19.9 million, plus the aforementioned adjustment related to the Tax Act, which increased the Company's income tax expense by $5.8 million. The income tax benefit for the year ended December 31, 2016 was primarily due to reversals of the valuation allowance of the Company’s net deferred tax assets of $61.4 million.
 As of December 31,
(in thousands)20202019
Deferred tax assets
Tax credits$93,874 $98,541 
Equity method investments5,149 
Net operating loss carryforwards2,906 2,956 
Intangible assets2,765 1,574 
ARO, net of reimbursements2,167 80 
Employee related liabilities827 1,065 
Other investments548 555 
Operating lease obligations508 1,307 
Inventory507 
Other69 244 
Total deferred tax assets108,813 106,829 
Less valuation allowance(88,758)(79,610)
Deferred tax assets20,055 27,219 
Less: Deferred tax liabilities
Property and equipment and other(7,039)(11,087)
Equity method investments(736)
Upfront customer consideration(1,847)
Right of use operating lease assets(270)(1,301)
Inventory(295)
Total deferred tax liabilities(9,451)(13,124)
Net deferred tax assets$10,604 $14,095 
Accounting for income taxes requires that companies assess whether a valuation allowance should be recorded against their deferred tax asset based on an assessment of the amount of the deferred tax asset that is “more likely than not” to be realized. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount that is more likely than not to be realized. 
The Company assesses the valuation allowance recorded against deferred tax assets at each reporting date. The determination of whether a valuation allowance for deferred tax assets is appropriate requires the evaluation of positive and negative evidence that can be objectively verified. Consideration must be given to all sources of taxable income available to realize thea deferred tax asset, including, as applicable, the future reversal of existing temporary differences, future taxable income forecasts exclusive of the reversal of temporary differences and carryforwards, taxable income in carryback years and tax planning strategies. In estimating taxes, the Company assesses the relative merits and risks of the appropriate tax treatment of transactions taking into account statutory, judicial, and regulatory guidance.
As of December 31, 2017,2020, the Company concluded it is more likely than not the Company will generate sufficient taxable income within the applicable NOLnet operating loss and tax credit carry-forward periods to realize $38.7$10.6 million of its net deferred tax assets, and therefore, reversed $0.5 million ofwhich resulted in an increase in the valuation allowance.allowance from December 31, 2019 of $9.1 million. In reaching this conclusion, the Company most significantlyprimarily considered: (1) forecaststhe future reversal of continued future taxable income,existing temporary differences; and (2) changes to the current DTA balances related to the effects of the Tax Act, (3) changes to forecasts of future utilization of DTA's related to the effects of the Tax Act, and (4) impacts of additional RC invested facilities during 2017.taxable income.
Prior to 2016, the Company had recorded a valuation allowance for all of its deferred tax assets, primarily due to its historical three-year cumulative loss position. However, as of December 31, 2016, the Company concluded it was more likely than not the Company would generate sufficient taxable income within the applicable NOL and tax credit carry-forward periods to realize $61.4 million of its net deferred tax assets, and therefore, reversed $61.4 million of the valuation allowance, after utilizing $11.0 million during 2016. This conclusion was reached after weighing all of the evidence and determining that the positive evidence outweighed the negative evidence. The positive evidence considered by management in arriving at its conclusion to partially
89


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


reverse the valuation allowance includes factors such as: (1) emergence from the previous three-year cumulative loss position during the fourth quarter of 2016, (2) completion of four consecutive quarters of profitability and (3) forecasts of continued future profitability.
The following table presents the approximate amount of state net operating loss carryforwards and federal tax credit carryforwards available to reduce future taxable income, along with the respective range of years that the net operating loss and tax credit carryforwards would expire if not utilized:
 As of December 31,As of December 31,
(in thousands) 2017 Beginning expiration year Ending expiration year(in thousands)2020Beginning expiration yearEnding expiration year
State net operating loss carryforwards $41,071
 2021 2037
Foreign net operating loss carryforwardsForeign net operating loss carryforwards$656 20412041
State and other operating loss carryforwardsState and other operating loss carryforwards$2,250 20212036
Federal tax credit carryforwards $100,367
 2031 2037Federal tax credit carryforwards$93,874 20322040
The following table sets forth a reconciliation of the beginning and ending unrecognized tax benefits on a gross basis for the years ended December 31, 2017, 20162020 and 2015:2019:
 Years Ended December 31,
(in thousands)20202019
Balance as of January 1$946 $54 
Increases for tax positions of prior years892 
Balance as of December 31$946 $946 
  Years Ended December 31,
(in thousands) 2017 2016 2015
Balance as of January 1 $54
 $
 $
Increases for tax positions of current year 
 54
 
Balance as of December 31 $54
 $54
 $
Included in the balance of unrecognized tax benefits as of December 31, 2020 and December 31, 2019 is $0.7 million of tax benefits that, if utilized, would result in an adjustment to deferred taxes.
The Company did not record any adjustments or recognize interest expense for uncertain tax positions for the years ended December 31, 2017, 20162020 and 2015.2019. Interest and penalties related to uncertain tax positions are accrued and included in the Interest expense line item in the Consolidated Statements of Operations. Additionally, the Company recognizes interest expense related to the federal tax treatment of RC facilities at Tinuum Group in the Interest expense line item in the Consolidated Statements of Operations. Additional information related to these interest amountsthe components of Interest expense is included in Note 10.17.
The Company files income tax returns in the U.S. and in various states. The Company is no longer subject to U.S. federal examinations by tax authorities for years before 2014.2017. The Company is generally no longer subject to state examinations by tax authorities for years before 2013.
Note 19 - Business Segment Information
Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by a company's chief operating decision maker ("CODM"), or a decision making group, in deciding how to allocate resources and in assessing financial performance. As of December 31, 2020, the Company's CODM was the Company's CEO. The Company's operating and reportable segments are organized by products and services provided.
As of December 31, 2020, the Company has 2 reportable segments: (1) Refined Coal ("RC"); and (2) Advanced Purification Technologies ("APT").
Given the downward trends in the coal-fired power generation market, the prices of competing power generation sources as well as the expected expiration of the Section 45 tax credit period as of December 31, 2021, during 2020 we initiated plans to expand our AC products and diversify into new markets. As a result, internal changes, including changes in operating structure and the method in which the Chief Operating Decision Maker ("CODM") allocates resources, resulted in the change in reportable segments. The Company has recast segment information below for the year ended December 31, 2019 to be consistent with the new reportable segments as of December 31, 2020.
The business segment measurements provided to and evaluated by the CODM are computed in accordance with the principles listed below:
The accounting policies of the operating segments are the same as those described in the summary of significant accounting policies except as described below.
Segment revenues include equity method earnings and losses from the Company's equity method investments.
90


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Segment operating income (loss) includes segment revenues and allocation of certain "Corporate general and administrative expenses," which includes Payroll and benefits, General and administrative, and Depreciation, amortization, depletion and accretion.
RC segment operating income includes interest expense directly attributable to the RC segment.
As of December 31, 2020 and 2019, substantially all of the Company's material assets are located in the U.S. and all significant customers are U.S. companies. The following table presents the Company's operating segment results for the years ended December 31, 2020 and 2019:
 Years Ended December 31,
(in thousands)20202019
Revenues:
Refined Coal:
Earnings in equity method investments$30,978 $69,176 
License royalties, related party13,440 16,899 
44,418 86,075 
Advanced Purification Technologies:
Consumables48,122 53,187 
Other15 
48,137 53,187 
Total segment reporting revenues92,555 139,262 
Adjustments to reconcile to reported revenues:
Earnings in equity method investments(30,978)(69,176)
Total reported revenues$61,577 $70,086 
Segment operating income (loss)
Refined Coal (1)
$42,689 $83,471 
Advanced Purification Technologies (2)
(39,958)(13,600)
Total segment operating income$2,731 $69,871 
(1) Included in RC segment operating income for the years ended December 31, 2020 and 2019 is 453A interest expense of $0.3 million and $1.0 million, respectively.
(2) Included in APT segment operating loss for the years ended December 31, 2020 and 2019 was $7.9 million and $7.2 million, respectively, of depreciation, amortization, depletion and accretion expenses on mine and plant related long-lived assets and liabilities. Included in APT segment operating loss for the year ended December 31, 2020 was an impairment charge of $26.1 million, offset by a gain on settlement of $1.1 million. Included in APT segment operating loss for the year ended December 31, 2019 was approximately $5.0 million of amortization expense related to the fair value of inventory.
91


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

A reconciliation of reportable segment operating income to the Company's consolidated net income is as follows:
 Years Ended December 31,
(in thousands)20202019
Total reported segment operating income$2,731 $69,871 
Adjustments to reconcile to (loss) income before income tax expense attributable to the Company:
Corporate payroll and benefits(2,866)(2,592)
Corporate legal and professional fees(4,954)(7,485)
Corporate general and administrative(5,096)(6,836)
Corporate depreciation and amortization(551)(82)
Corporate interest expense, net(3,060)(5,767)
Other income, net427 
(Loss) income before income tax expense$(13,791)$47,536 
Corporate general and administrative expenses include certain costs that benefit the business as a whole but are not directly related to one of the Company's segments. Such costs include, but are not limited to, accounting and human resources staff, information systems costs, legal fees, facility costs, audit fees and corporate governance expenses. 
A reconciliation of reportable segment assets to the Company's consolidated assets is as follows:
As of December 31,
(in thousands)20202019
Assets:
Refined Coal (1)
$11,516 $43,953 
Advanced Purification Technologies (2)
80,877 90,083 
Total segment assets92,393 134,036 
Corporate (3)
54,278 39,763 
Consolidated$146,671 $173,799 
(1) Includes $7.7 million and $39.2 million of investments in equity method investees as of December 31, 2020 and 2019, respectively.
(2) Includes $34.6 million and $56.5 million of long-lived assets, net. Expenditures for additions to long-lived assets were $7.3 million and $12.6 million, respectively, for the years ended December 31, 2020 and 2019.
(3) Includes the Company's net deferred tax assets of $10.6 million and $14.1 million as of December 31, 2020 and 2019, respectively.
92


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Note 1320 - Business Segment InformationFair Value Measurements
Operating segmentsFair Value of Financial Instruments
The carrying amounts of financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, deposits and accrued expenses, approximate fair value due to the short maturity of these instruments. The carrying amounts of the Senior Term Loan and other obligations. including finance leases, approximate fair value based on credit terms and market interest rates currently available for similar instruments. Accordingly, these instruments are defined as componentsnot presented in the table below. The following table provides the estimated fair values of an enterprise about which separatethe remaining financial information is available that is evaluated regularly by a company's chief operating decision maker ("CODM"), or a decision making group, in deciding how to allocate resources and in assessing financial performance. Asinstruments:
As of December 31, 2020As of December 31, 2019
(in thousands)Carrying ValueFair ValueCarrying ValueFair Value
Financial Instruments:
Highview Investment$552 $552 $552 $552 
Highview Obligation$228 $228 $220 $220 
Concentration of December 31, 2017, the Company's CODM was the Company's CEO. The Company's operating and reportable segments are organized by products and services provided.credit risk
As of December 31, 2016,2020, the Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents. The Company holds cash and cash equivalents at three financial institutions as of December 31, 2020. If those institutions were unable to perform their obligations, the Company has two reportable segments: (1) Refined Coal ("RC");would be at risk regarding the amount of its cash balance in excess of the federal deposit insurance corporation limits ($250 thousand).
Assets and (2) Emissions Control ("EC").Liabilities Measured at Fair Value on a Recurring Basis
As of December 31, 2020 and December 31, 2019, the Company had no material financial instruments carried and measured at fair value on a recurring basis.
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
As disclosed in Note 3, the Company completed the asset acquisition of Marshall Mine, LLC. The estimated fair values of the assets acquired and liabilities assumed were determined based on Level 3 inputs.
As disclosed in Note 5, the Company recorded an impairment charge related to the Asset Group based on a valuation model that included an expected future discounted cash flow model using Level 3 inputs.
The business segment measurements provided to and evaluated byCompany completed the CODM are computedCarbon Solutions Acquisition, in accordance withwhich the principles listed below:
The accounting policiesfair value of the operating segmentspurchase consideration totaled $66.5 million. The Company's estimated fair values of the assets acquired and liabilities assumed are disclosed in Note 8. The fair value measurements represent Level 3 measurements as they were based on significant inputs not observable in the market.
As noted in Note 17, the Company accounts for the Highview Investment as an investment recorded at cost, less impairment, plus or minus observable changes in price for identical or similar investments of the same issuer. Fair value measurements, if any, represent either Level 2 or Level 3 measurements.
Note 21 - Major Customers
Revenues from external customers who represent 10% or more of the Company’s revenues for the years ended December 31, 2020 and 2019 were as those described in the summary of significant accounting policies except as described below.follows:
Segment revenues include equity method earnings and losses from the Company's equity method investments and royalties earned from Tinuum Group and income related to sales-type leases.
  
Years ended December 31,
CustomerRevenue TypeSegment(s)20202019
ALicense royalties, related partyRC22%24%
BConsumablesAPT10%10%
Segment operating income (loss) includes segment revenues, gains related to sales of equity method investments and allocation of certain "Corporate general and administrative expenses," which includes Payroll and benefits, Rent and occupancy, Legal and professional fees, and General and administrative.
RC segment operating income includes interest expense directly attributable to the RC segment.

93


Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

As of December 31, 2017 and December 31, 2016, substantially all of the Company's material assets are located in the U.S. and all significant customers are U.S. companies. The following table presents the Company's operating segment results for the years ended December 31, 2017, 2016 and 2015:

  Years Ended December 31,
(in thousands) 2017 2016 2015
Revenues:      
Refined Coal:      
Earnings in equity method investments $53,843
 $45,584
 $8,921
Consulting services 
 
 55
Royalties, related party 9,672
 6,125
 10,642
  63,515
 51,709
 19,618
Emissions Control:      
Equipment sales 31,401
 46,949
 60,099
Chemicals 4,246
 3,025
 888
Consulting services 45
 648
 1,697
  35,692
 50,622
 62,684
Total segment reporting revenues 99,207
 102,331
 82,302
       
Adjustments to reconcile to reported revenues:      
Refined Coal:      
Earnings in equity method investments (53,843) (45,584) (8,921)
Royalties, related party (9,672) (6,125) (10,642)
  (63,515) (51,709) (19,563)
       
Total reported revenues $35,692
 $50,622
 $62,739
Segment operating income (loss)      
Refined Coal (1)
 $59,908
 $51,264
 $12,131
Emissions Control (2)
 379
 7,334
 (7,583)
Total segment operating income $60,287
 $58,598
 $4,548

(1) Included within the RC segment operating income for the year ended December 31, 2016 is a $2.1 million gain on the sale of RCM6 and for the years ended December 31, 2017, 2016 and 2015, 453A interest expense of $2.6 million, $2.5 million and $4.6 million, respectively. Also included within the RC segment operating income for the years ended December 31, 2016 and 2015 is interest expense related to the RCM6 Note Payable of $0.3 millionand $2.5 million, respectively.
(2) Included within the EC segment operating income for the year ended December 31, 2016 is a $0.9 million gain related to a termination of a sales-type lease.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

A reconciliation of reportable segment operating income to the Company's consolidated net income is as follows:
  Years Ended December 31,
(in thousands) 2017 2016 2015
Segment operating income      
Total reported segment operating income $60,287
 $58,598
 $4,548
Adjustments to reconcile to net income (loss) attributable to the Company      
Corporate payroll and benefits (5,565) (9,415) (14,842)
Corporate rent and occupancy (293) (1,187) (707)
Corporate legal and professional fees (4,010) (8,230) (15,199)
Corporate general and administrative (3,400) (3,811) (3,640)
Corporate depreciation and amortization (342) (608) (578)
Corporate interest (expense) income, net (432) (2,334) 24
Other income (expense), net 5,780
 3,727
 273
Income tax (expense) benefit (24,152) 60,938
 (20)
Net income (loss) $27,873
 $97,678
 $(30,141)
Corporate general and administrative expenses include certain costs that benefit the business as a whole but are not directly related to one of the Company's segments. Such costs include, but are not limited to, accounting and human resources staff, information systems costs, legal fees, facility costs, audit fees and corporate governance expenses. 
A reconciliation of reportable segment assets to the Company's consolidated assets is as follows:
  As of December 31,
(in thousands) 2017 2016
Assets:    
Refined Coal(1)
 $8,092
 $6,310
Emissions Control 3,755
 24,551
Total segment assets 11,847
 30,861
All Other and Corporate(2)
 70,771
 76,435
Consolidated $82,618
 $107,296
(1) Includes $4.4 million of investments in equity method investees.
(2) Included within All Other and Corporate are the Company's deferred tax assets.
Note 14 - Major Customers
Revenues from unaffiliated customers who represent 10% or more of the Company’s revenues in for the years ended December 31, 2017, 2016 and 2015 were as follows:
  
     Years Ended December 31,
Customer Revenue Type Segment(s) 2017 2016 2015
A Equipment sales EC 62% 21% 3%
B Equipment sales, Consulting services EC —% 14% 16%
C Consulting services EC —% —% 11%
D Equipment sales EC —% —% 15%
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Note 1522 - Related Party Transactions
Accounts Receivable
The following table shows the Company's receivable balance associated with related parties as of December 31, 20172020 and 2016:
2019:
 As of December 31, As of December 31,
(in thousands) 2017 2016(in thousands)20202019
Receivable from related party - Tinuum Group $3,247
 $1,934
Receivable from related party - Tinuum Group$3,453 $4,246 
Other IncomeRevenues
The following table shows the other income recognized with related parties during the years ended December 31, 2017, 20162020 and 2015:
2019:
Years Ended December 31,
(in thousands)(in thousands)20202019
License royalties, related party - Tinuum GroupLicense royalties, related party - Tinuum Group$13,440 $16,899 
 Years Ended December 31,
(in thousands) 2017 2016 2015
Royalties, related party - Tinuum Group $9,672
 $6,125
 $10,642
The above Tinuum Group royalties are included withinin the Royalties,License royalties, related party line in the Consolidated Statements of Operations.
DSI Business Owner
As of December 31, 2014, the Company terminated the consulting portion of the agreements with the DSI Business Owner. However, according to the terms of the remaining agreements, the Company was required to make all remaining payments structured as a note payable (the "DSI Business Owner Note Payable") through the third quarter of 2017. In February 2016, the Company entered into an agreement with the DSI Business Owner and settled the remaining amounts owed under the DSI Business Owner Note Payable as of the date of the agreement of approximately $1.1 million for $0.3 million, which was paid during the first quarter of 2016. The difference between the remaining amounts owed and the settlement amount was included within the Gain on settlement of note payable and licensed technology line item in the Consolidated Statements of Operations for the year ended December 31, 2016.
Highview License
As discussed in Note 10, the Company has an obligation of £0.2 million (approximately $0.2 million) as a result of the termination of the Highview License, which will only be settled by relinquishing shares of Highview currently owned by the Company equal to £0.2 million.
Arch Coal License
In June 2010, the Company entered into a Development and License Agreement with Arch Coal, Inc. ("Arch"), a related party as an Arch designee held a Board seat through June 2017, pursuant to which the Company licensed, on an exclusive, non-transferable basis, the use of certain of its technology to enhance coal by a proprietary treatment process. The Company received a non-refundable license fee payment from Arch in the amount of $2.0 million and incurred non-reimbursable costs associated with this agreement in the amount of $0.3 million.
Note 1623 - Defined Contribution Savings PlanPlans
The Company sponsors a qualified defined contribution savings plan (the "401(k) Plan") that allows participation by eligible employees who may defer a portion of their gross pay. The Company makes contributions to the 401(k) Plan based on percentages of an employee's eligible compensation as specified in the 401(k) Plan, and such employer contributions are in the form of cash. Prior to January 1, 2020, the Company sponsored 2 401(k) Plans, which were merged effective January 1, 2020.
The following table presents the amount of the Company'Company's contributions made to the 401(k) Plan,Plans:
Years Ended December 31,
(in thousands)20202019
401(k) Plans employer contributions$484 $553 
Note 24 - Restructuring and Other Compensation
Restructuring
For the years ended December 31, 2020 and 2019, the Company did not record material restructuring charges.
Other Compensation
On March 27, 2020, the Company's CEO resigned from the Company effective June 30, 2020. Pursuant to a settlement agreement executed between the Company and the CEO, the Company was obligated to pay severance compensation to the CEO in the form of salary continuance, cash bonus, contingent upon the Company achieving a performance metric, healthcare benefits, RSAs and PSUs, which is reflected withinin the Payrollaggregate was $1.4 million. As of June 30, 2020, the Company recorded a liability for the total severance compensation and benefits line itemcorresponding expense under the caption "Payroll and benefits" in the Condensed Consolidated Statements of Operations:Operations.
94

  Years Ended December 31,
(in thousands) 2017 2016 2015
401(k) Plan employer contributions $56
 $172
 $439

Due to the prior year Restructuring actions discussed in Note 18 as well as usage of forfeitures within the 401(k) Plan, there was a decrease in employer contributions made to the 401(k) Plan for the year ended December 31, 2017.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


Note 17 - Acquisition
2015 Acquisition
In March 2015, the Company acquired the certain assets of InSyst Ltd. and ClearView Monitoring Solutions Ltd. (collectively "ClearView"), to be operated under the Company's wholly-owned subsidiary, ADA Analytics, for total cash payments of $2.4 million, which was inclusive of value-add tax of $0.4 million. The acquisition was accounted for under the acquisition method of accounting, which requires the total purchase consideration to be allocated to the assets acquired and liabilities assumed based on estimates of fair value. Operating results related to the acquired assets were consolidated into the Company’s results of operations beginning March 6, 2015.
A summary of the purchase consideration and allocation of the purchase consideration is as follows:
  (in thousands)
Purchase consideration:  
Cash paid $2,360
Fair value of liabilities assumed:  
Accrued liabilities 10
Contingent consideration 451
Total fair value of liabilities assumed 461
   
Total purchase consideration $2,821
   
Allocation of purchase consideration  
Receivables $360
Property and equipment and other 82
Intangibles - in process research and development 2,379
Total $2,821
During August 2015, as part of a broader strategic restructuring of the Company's business, the Company’s management approved an action to wind down operations of ADA Analytics. As a result of these actions, the Company fully impaired the carrying value of the assets and reversed the liability for the contingent consideration, thereby recognizing net impairment expense in the amount of $1.9 million during 2015. As disclosed in Note 9, the impairment expense was included as a component of research and development expense for the year ended December 31, 2015.
Note 18 - Restructuring
During the year ended December 31, 2017, the Company did not record material restructuring charges.
During the year ended December 31, 2016, the Company recorded restructuring charges in connection with a reduction in force, the departure of certain executive officers and management's further alignment of the business with strategic objectives. These charges related to severance arrangements with departing employees and executives as well as non-cash charges related to the acceleration of vesting of certain stock awards.
During the year ended December 31, 2015, the Company recorded restructuring charges in connection with a reduction in force, the departure of executive officers and management's further alignment of the business with strategic objectives. These charges related to severance arrangements with departing employees and executives, including non-cash charges related to the acceleration of vesting of certain stock awards. In 2015, the charges also related to the closing of the Pennsylvania office and fabrication facility and the termination of the operations of ADA Analytics, a foreign subsidiary that was involved in the development of certain data analytics and monitoring products. Furthermore, during the fourth quarter of 2015, the Company closed its fabrication facility in Pennsylvania and recorded restructuring charges related thereto.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

A summary of the net pretax charges incurred by segment is as follows:
    Pretax Charge
(in thousands, except employee data) Approximate Number of Employees Refined Coal Emissions Control All Other and Corporate Total
Year ended December 31, 2016          
Restructuring charges 40
 $
 $1,164
 $881
 $2,045
Changes in estimates   
 (210) (276) (486)
Total pretax charge, net of reversals   $
 $954
 $605
 $1,559
           
Year ended December 31, 2015          
Restructuring charges 162
 $
 $5,108
 $5,264
 $10,372
Changes in estimates   $
 $(10) $(2) $(12)
Total pretax charge, net of reversals   $
 $5,098
 $5,262
 $10,360

The following table summarizes the Company's utilization of restructuring accruals for the years ended December 31, 2017, 20162020 and 2015:2019:
(in thousands)Employee Severance
Beginning accrual as of January 1, 2019$2,208 
Expense provision172 
Cash payments and other(2,051)
Change in estimates(75)
Accrual as of December 31, 2019254 
Expense provision1,403 
Cash payments and other(1,386)
Accrual as of December 31, 2020$271 
(in thousands) Employee Severance Facility Closures
Beginning accrual as of January 1, 2015 $1,690
 $
Expense provision (1)
 8,498
 2,650
Cash payments and other (1)
 (7,595) (1,873)
Change in estimates (1)
 (12) 
Accrual as of December 31, 2015 2,581
 777
Expense provision (1)
 2,045
 
Cash payments and other (1)
 (3,898) (320)
Change in estimates (1)
 (276) (210)
Accrual as of December 31, 2016 452
 247
Expense provision (1)
 56
 
Cash payments and other (1)
 (508) (250)
Change in estimates (1)
 
 3
Accrual as of December 31, 2017 $
 $

(1) Included withinFor the years ended December 31, 2020 and 2019, included in the Expense provision and Cash payments and other line items in the above table is stock-based compensation of zero, $0.4$0.6 million and $3.4 million for the years ended December 31, 2017, 2016 and 2015,0, respectively, resulting from the accelerated vesting of modified equity-based compensation awards for certain terminated employees. Additionally, as discussed in Note 17, due to restructuring activities the Company fully impaired the carrying value of certain assets, thereby recognizing net impairment expense in the amount of $1.9 million during the year ended December 31, 2015.

Restructuring accruals related to personnel are included withinin the Accrued payroll and related liabilities line item in the Consolidated Balance Sheets. Restructuring expenses related to personnel are included withinin the Payroll and benefits and Research and development, netImpairment of long-lived assets line items in the Consolidated Statements of Operations. Restructuring accruals related to facilities are included within the Other current liabilities line item in the Consolidated Balance Sheets. Restructuring expenses related to facilities are included within the Rent and occupancy line item in the Consolidated Statements of Operations.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements

Note 1925 - Quarterly Financial Results (unaudited)
Summarized quarterly results for the two years ended December 31, 20172020 and December 31, 20162019 are as follows:
 For the Quarter EndedFor the Quarter Ended
(in thousands, except per share data) December 31, 2017 September 30, 2017 June 30, 2017 March 31, 2017(in thousands, except per share data)December 31, 2020September 30, 2020June 30, 2020March 31, 2020
Revenues $544
 $2,294
 $25,465
 $7,389
Revenues$18,360 $19,471 $11,483 $12,263 
Cost of revenues, exclusive of operating expenses shown below 648
 2,041
 23,295
 5,901
Cost of revenues, exclusive of operating expenses shown below10,693 15,013 7,416 11,491 
Other operating expenses 4,205
 4,197
 4,020
 5,199
Other operating expenses6,117 (1)7,283 35,132 9,413 
Operating loss (4,309) (3,944) (1,850) (3,711)
Operating income (loss)Operating income (loss)1,550 (2,825)(31,065)(8,641)
Earnings from equity method investments 17,754
 12,120
 10,155
 13,814
Earnings from equity method investments5,019 9,518 8,168 8,273 
Royalties, related party 3,247
 2,804
 1,866
 1,755
Other income (expenses), net 1,831
 (1,602) (121) 2,216
Income before income tax expense 18,523
 9,378
 10,050
 14,074
Other expenses, netOther expenses, net(943)(864)(814)(1,167)
Income (loss) before income tax expenseIncome (loss) before income tax expense5,626 5,829 (23,711)(1,535)
Income tax expense 11,538
(1)3,586
 3,642
 5,386
Income tax expense5,196 (2)854 103 358 
Net income $6,985
 $5,792
 $6,408
 $8,688
Earnings per common share – basic $0.34
 $0.28
 $0.29
 $0.39
Earnings per common share – diluted $0.33
 $0.28
 $0.29
 $0.39
Net income (loss)Net income (loss)$430 $4,975 $(23,814)$(1,893)
Earnings (loss) per common share – basicEarnings (loss) per common share – basic$0.02 $0.27 $(1.32)$(0.11)
Earnings (loss) per common share – dilutedEarnings (loss) per common share – diluted$0.02 $0.27 $(1.32)$(0.11)
Weighted-average number of common shares outstanding        Weighted-average number of common shares outstanding
Basic 20,767
 20,808
 21,866
 22,056
Basic18,109 18,093 18,014 17,932 
Diluted 20,864
 20,854
 21,880
 22,243
Diluted18,167 18,103 18,014 17,932 
95

  For the Quarter Ended
(in thousands, except per share data) December 31, 2016 September 30, 2016 June 30, 2016 March 31, 2016
 Revenues $3,604
 $15,710
 $8,951
 $22,357
Cost of revenues, exclusive of operating expenses shown below 3,478
 13,259
 5,769
 17,311
Other operating expenses 5,388
 5,364
 7,794
 8,357
 Operating loss (5,262) (2,913) (4,612) (3,311)
Earnings from equity method investments 15,518
 10,735
 13,754
 5,577
Royalties, related party 2,203
 2,064
 669
 1,189
Other expenses, net 1,698
(2)309
 (1,852) 974
Income before income tax expense 14,157
 10,195
 7,959
 4,429
 Income tax (benefit) expense (61,673)(3)583
 99
 53
 Net income $75,830
 $9,612
 $7,860
 $4,376
Loss per common share – basic $3.45
 $0.44
 $0.36
 $0.20
Loss per common share – diluted $3.39
 $0.43
 $0.35
 $0.20
Weighted-average number of common shares outstanding        
Basic 21,693
 21,740
 21,875
 21,849
Diluted 22,061
 22,098
 22,187
 22,177

(1) During the fourth quarter of 2017, the Company recorded an income tax expense of $11.5 million primarily related to statutory federal and state taxes of $5.7 million at the statutory rates, and the impact of the Tax Act, which increased the Company's income tax expense by $5.8 million.
Advanced Emissions Solutions, Inc. and Subsidiaries
Notes to Consolidated Financial Statements


For the Quarter Ended
(in thousands, except per share data)December 31, 2019September 30, 2019June 30, 2019March 31, 2019
 Revenues$16,047 $19,133 $15,577 $19,329 
Cost of revenues, exclusive of operating expenses shown below11,104 11,939 12,292 14,108 
Other operating expenses9,630 9,585 7,545 8,776 
Operating loss(4,687)(2,391)(4,260)(3,555)
Earnings from equity method investments12,125 14,426 20,935 21,690 
Other expenses, net(1,269)(1,517)(1,927)(2,034)
Income before income tax expense6,169 10,518 14,748 16,101 
 Income tax (benefit) expense(2,929)(3)6,595 6,634 1,699 
 Net income$9,098 $3,923 $8,114 $14,402 
Earnings per common share – basic$0.50 $0.22 $0.45 $0.79 
Earnings per common share – diluted$0.50 $0.21 $0.44 $0.78 
Weighted-average number of common shares outstanding
Basic18,066 18,112 18,172 18,268 
Diluted18,275 18,339 18,377 18,433 

(1) During the fourth quarter of 2020, the Company recorded a gain on settlement of 1.1 million related to the Settlement reached with the Former Customer as further described in Note 17.
(2) During the fourth quarter of 2016, the Company revised its estimate for future Royalty Award payments based on an updated forecast provided to the Company from Carbon Solutions. Based primarily on the updated forecast,2020, the Company recorded a $4.0income tax expense of $5.2 million reductionprimarily due to its Royalty Award accrual.an increase in the valuation allowance as of December 31, 2020 related to the Company's deferred income tax assets.
(3) During the fourth quarter of 2016,2019, the Company released $61.4 million of the valuation allowance related to the deferred tax assets that resulted in anrecorded income tax benefit of $61.7 million. See further discussion$2.9 million primarily due to a decrease in Note 12.current income tax expense compared to current income tax recorded from the nine months ended September 30, 2019. This decrease was primarily due to a decrease in income before income tax expense for the year ended December 31, 2019 compared to the estimated annual income before income tax expense that was used in computing current income tax expense for the nine months ended September 30, 2019.

Note 2026 - Subsequent Events
Unless disclosed elsewhere withinin the notes to the Consolidated Financial Statements, the following are the significant matters that occurred subsequent to December 31, 2017.2020.
DividendsIn February 2021, the Company entered into a 5-year supply agreement with Cabot Norit Nederland B.V., a subsidiary of Cabot Corporation ("Cabot"), to supply Cabot with lignite activated carbon products and other ADES proprietary products used for mercury removal in utility and industrial coal-fired power plants. Cabot will be the exclusive and sole reseller of the products within Europe, Turkey, the Middle East and Africa.
On February 8, 2018, the Company's Board of Directors declared a quarterly dividend of $0.25 per share of common stock, which was paid on March 8, 2018 to stockholders of record at the close of business on February 21, 2018. 
96




Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
None.
Item 9A. Controls and Procedures
Evaluation of Disclosure Controls and Procedures
As required by Rule 13a‑15(b) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), we have evaluated, under the supervision of and with the participation of our management, including our principal executive officer and principal financial officer, the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a‑15(e) and 15d‑15(e) under the Exchange Act) as of the end of the period covered by this annual report. Our disclosure controls and procedures are designed to ensure that information required to be disclosed in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms.  Based upon this evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective as of December 31, 2017.
Changes in Internal Control Over Financial Reporting
There has been no change in our internal control over financial reporting (as defined in Rules 13a‑15(f) and 15d‑15(f) under the Exchange Act) during the fourth quarter of 2017 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.2020.
Management’s Report on Internal Control over Financial Reporting
Management is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. Internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with generally accepted accounting principles. The Company's internal control over financial reporting includes those policies and procedures that:
1.
1.Pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets;
2.Provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the Company are being made only in accordance with authorizations of our management and directors; and
3.Provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the Company’s assets that could have a material effect on our financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Under the supervision of, and with the participation of our management, including the principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework and criteria established in Internal Control-Integrated Framework in 2013, issued by the Committee of Sponsoring Organizations of the Treadway Commission.  Based on this evaluation, our management concluded that our internal control over financial reporting was effective as of December 31, 2017.
Moss Adams LLP, an independent registered public accounting firm, has issued an attestation report on our internal control over financial reporting as of December 31, 2017 and its report is included herein.





Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of
Advanced Emissions Solutions, Inc. and Subsidiaries

Opinion on Internal Control over Financial Reporting

We have audited Advanced Emissions Solutions, Inc. and subsidiaries’ (the “Company”) internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). In our opinion, the Company maintained, in all material respects, effective control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by COSO.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the consolidated balance sheet of Advanced Emissions Solutions, Inc. as of December 31, 2017, the related consolidated statements of operations, stockholders’ equity and cash flows for the year then ended, and the related notes (collectively referred to as the “consolidatedfinancial statements”) and our report dated March 12, 2018, expressed an unqualified opinion on those consolidated financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provideour assets;
2.Provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the companyCompany are being made only in accordance with authorizations of our management and directors of the company;directors; and (3) provide
3.Provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the company’sCompany’s assets that could have a material effect on theour financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Under the supervision of, and with the participation of our management, including the principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework and criteria established in Internal Control-Integrated Framework in 2013, issued by the Committee of Sponsoring Organizations of the Treadway Commission.  Based on this evaluation, our management concluded that our internal control over financial reporting was effective as of December 31, 2020.
/s/ Moss Adams LLPChanges in Internal Control Over Financial Reporting

There has been no change in our internal control over financial reporting (as defined in Rules 13a‑15(f) and 15d‑15(f) under the Exchange Act) during the fourth quarter of 2020 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.
Denver, Colorado
97
March 12, 2018



Item 9B. Other Information
None.

98



PART III
Item 10. Directors, Executive Officers, and Corporate Governance
The information required by this Item is incorporated by reference to our definitive proxy statement for the Annual Meeting of Stockholders to be filed within 120 days from December 31, 2017.2020.

Item 11. Executive Compensation
The information required by this Item is incorporated by reference to our definitive proxy statement for the Annual Meeting of Stockholders to be filed within 120 days from December 31, 2017.2020.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
The information required by this Item concerning security ownership of certain beneficial owners and management is incorporated by reference to our definitive proxy statement for the Annual Meeting of Stockholders to be filed within 120 days from December 31, 2017,2020, with the exception of the following information.
Securities Authorized for Issuance under Equity Compensation Plans
We have plans under which equity awards are authorized for grant or issuance as compensation to eligible employees, consultants, and members of the Board. Our stockholders have approved these plans. See Note 616 - Stock-Based Compensation included in Item 8 of this Report for further information about the material terms of our equity compensation plans. The following table is a summary of the shares of our common stock authorized for issuance under the equity compensation plans as of December 31, 2017:2020:
Plan Category Number of securities to be issued upon exercise of outstanding options, warrants and rights 
Weighted-average exercise price of outstanding options, warrants and rights (2)
 
Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in the first column) (3)
Equity compensation plans approved by security holders (1)
 641,852
 $11.64
 2,580,974
Equity compensation plans not approved by security holders 
 $
 
Total 641,852
   2,580,974
Plan CategoryNumber of securities to be issued upon exercise of outstanding options, warrants and rightsWeighted-average exercise price of outstanding options, warrants and rightsNumber of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in the first column) (2)
Equity compensation plans approved by security holders (1)— $— 1,748,491 
Equity compensation plans not approved by security holders— $— — 
Total— 1,748,491 
(1) Includes the Amended and Restated 2007 Equity Incentive Plan, as amended, the Amended and Restated 2010 Non-Management Compensation and Incentive Plan, as amended, and the 2017 Omnibus Incentive Plan.
(2) The weighted-average price pertains only to 622,446 shares of common stock issuable upon the exercise of outstanding options.
(3) The number of securities is reduced by 276,607373,860 shares of restricted common stock for which restrictions have not lapsed.

Item 13. Certain Relationships and Related Transactions and Director Independence
The information required by this Item is incorporated by reference to our definitive proxy statement for the Annual Meeting of Stockholders to be filed within 120 days from December 31, 2017.2020.

Item 14. Principal Accountant Fees and Services
The information required by this Item is incorporated by reference to our definitive proxy statement for the Annual Meeting of Stockholders to be filed within 120 days from December 31, 2017.2020.



99



Item 15. Exhibits and Financial Statement Schedules
(a)The following consolidated financial statements of Advanced Emissions Solutions, Inc., are filed as part of this Report under Item 8:
(1)Financial Statements – see Index to Consolidated Financial Statements in Item 8;
(2)Financial Statement Schedules – All schedules are omitted because the required information is not applicable or is not present in amounts sufficient to require submission of the schedule or because the information required is included in the Consolidated Financial Statements and Notes thereto; and
(3)Exhibits – Those exhibits required by Item 601 of Regulation S-K and by paragraph (b) below.
(b)The following exhibits are filed as part of this Report or, where indicated, were heretofore filed and are hereby incorporated by reference:
(a)The following consolidated financial statements of Advanced Emissions Solutions, Inc. are filed as part of this Report under Item 8:
(1)    Financial Statements – see Index to Consolidated Financial Statements in Item 8;
(2)    Financial Statement Schedules – All schedules are omitted because the required information is not applicable or is not present in amounts sufficient to require submission of the schedule or because the information required is included in the Consolidated Financial Statements and Notes thereto; and
(3)    Exhibits – Those exhibits required by Item 601 of Regulation S-K and by paragraph (b) below.
(b)The following exhibits are filed as part of this Report or, where indicated, were heretofore filed and are hereby incorporated by reference:
Exhibit No.DescriptionFormFile No.Incorporated by Reference
Exhibit
Filing Date
3.110-Q000-549923.1August 9, 2013
3.210-K001-378223.2March 12, 2018
3.38-K001-378223.1May 8, 2017
4.110-Q000-549924.1August 9, 2013
4.28-K001-378223.2May 8, 2017
4.38-K001-378224.2April 11, 2018
4.48-K001-378224.3April 11, 2019
4.58-K001-378224.4April 9, 2020
10.18-K001-3782210.1June 22, 2017
10.210-K000-5499210.19February 29, 2016
10.38-K000-5499210.66September 2, 2014
10.410-Q001-3782210.1August 6, 2018
10.58-K001-3782210.1May 11, 2020
10.610-Q001-3782210.3August 10, 2020
10.710-Q001-3782210.4August 10, 2020
10.88-K001-3782210.1March 3, 2021
100


Exhibit No. Description Form File No. Incorporated by Reference
Exhibit
 Filing Date
3.1  10-Q 000-54992 3.1 August 9, 2013
3.2         
3.3  8-K 001-37822 3.1 May 8, 2017
4.1  10-Q 000-54992 4.1 August 9, 2013
4.2  8-K 001-37822 3.2 May 8, 2017
10.1  8-K 001-37822 10.1 June 22, 2017
10.2  10-K 000-54992 10.19 February 29, 2016
10.3  8-K 000-54992 10.66 September 2, 2014
10.4  10-K 000-50216 10.34 March 27, 2007
10.5  8-K 000-54992 10.67 September 2, 2014
10.6  10-Q/A 000-50216 10.33 September 28, 2011
10.7  10-Q 000-50216 10.89 November 14, 2011
10.8  10-Q 000-50216 10.59 November 9, 2012
10.9  10-Q 000-50216 10.87 August 12, 2011
10.10  10-K 000-54992 10.38 February 29, 2016
10.11  10-Q 000-50216 10.77 August 16, 2010

Exhibit No.DescriptionFormFile No.Incorporated by Reference
Exhibit
Filing Date
10.910-Q/A000-5021610.33September 28, 2011
10.1010-Q000-5021610.89November 14, 2011
10.1110-Q000-5021610.59November 9, 2012
10.1210-Q000-5021610.87August 12, 2011
10.1310-K000-5499210.38February 29, 2016
10.1410-Q000-5021610.77August 16, 2010
10.1510-K000-5021610.81March 28, 2011
10.1610-Q000-5499210.63November 12, 2013
10.1710-Q000-5021610.74August 16, 2010
10.1810-K000-5499210.44February 29, 2016
10.1910-K000-5021610.49March 15, 2012
10.2010-Q/A000-5021610.84September 28, 2011
10.2110-Q000-5021610.86August 12, 2011
10.2210-K000-5021610.44March 15, 2012
10.2310-K000-5021610.50March 15, 2012
10.2410-Q000-5021610.58November 9, 2012
10.2510-Q000-5499210.62November 12, 2013
10.2610-K000-5499210.69February 29, 2016
101


Exhibit No. Description Form File No. Incorporated by Reference
Exhibit
 Filing Date
10.12  10-K 000-50216 10.81 March 28, 2011
10.13  10-Q 000-54992 10.63 November 12, 2013
10.14  10-Q 000-50216 10.74 August 16, 2010
10.15  10-K 000-54992 10.44 February 29, 2016
10.16  10-K 000-50216 10.49 March 15, 2012
10.17  10-Q/A 000-50216 10.84 September 28, 2011
10.18  10-Q 000-50216 10.86 August 12, 2011
10.19  10-K 000-50216 10.44 March 15, 2012
10.20  10-K 000-50216 10.50 March 15, 2012
10.21  10-Q 000-50216 10.58 November 9, 2012
10.22  10-Q 000-54992 10.62 November 12, 2013
10.23  10-Q 000-50216 10.88 November 14, 2011
10.24  10-K 000-50216 10.45 March 15, 2012
10.25  10-K 000-54992 10.69 February 29, 2016
10.26  10-K 000-54992 10.70 February 29, 2016
10.27  10-K 000-54992 10.71 February 29, 2016
10.28  10-K 000-54992 10.72 February 29, 2016

Exhibit No.DescriptionFormFile No.Incorporated by Reference
Exhibit
Filing Date
10.278-K001-3782210.2December 13, 2018
10.288-K001-3782210.1September 29, 2020
10.298-K001-378222.1November 15, 2018
10.308-K001-3782210.1December 13, 2018
10.318-K001-3782210.2April 22, 2020
10.3210-K001-3782210.43March 18, 2019
10.3310-K001-3782210.44March 18, 2019
10.3410-Q001-3782210.1November 12, 2019
10.358-K001-3782210.1April 22, 2020
10.368-K001-3782210.1September 30, 2020
10.378-K001-3782210.2September 30, 2020
21.1
23.1
23.2
31.1
31.2
102
Exhibit No. Description Form File No. Incorporated by Reference
Exhibit
 Filing Date
10.29  10-K 000-54992 10.73 February 29, 2016
10.30  10-K 000-54992 10.74 February 29, 2016
10.31  10-K 000-54992 10.75 February 29, 2016
10.32  10-K 000-54992 10.76 February 29, 2016
10.33  10-K 000-54992 10.77 February 29, 2016
10.34  10-Q 001-37822 10.3 August 9, 2016
10.35  8-K 001-37822 10.1 September 1, 2016
10.36  10-K 001-37822 10.50 March 13, 2017
10.37  10-K 001-37822 10.51 March 13, 2017
10.38  10-Q 001-37822 10.1 November 6, 2017
10.39  8-K 001-37822 10.1 January 4, 2018
21.1         
23.1         
23.2         
23.3         
23.4         
31.1         
31.2         



Exhibit No.DescriptionFormFile No.Incorporated by Reference

Exhibit
Filing Date
32.1
10195
101The following financial statements, formatted in XBRL: (i) Consolidated Balance Sheets as of December 31, 20172020 and 2016,2019, (ii) Consolidated Statements of Operations for the Years ended December 31, 2017, 20162020 and 2015,2019, (iii) Consolidated Statements of Changes in Stockholders’ Equity (Deficit) for the Years ended December 31, 2017, 20162020 and 2015,2019, (iv) Consolidated Statements of Cash Flows for the Years ended December 31, 2017, 20162020 and 2015;2019; and (v) Notes to the Consolidated Financial Statements. The information in Exhibit 101 is “furnished” and not “filed” as provided in Rule 401 of Regulation S-T.
Notes:
*– Filed herewith.
**– Management contract or compensatory plan or arrangement.
***– Portions of this exhibit have been omitted pursuant to a request for confidential treatment. The non-public information has been separately filed with the Securities and Exchange Commission.

*    – Filed herewith.
**    – Management contract or compensatory plan or arrangement.
***    – Portions of this exhibit have been omitted pursuant to a request for confidential treatment. The non-public information has been separately filed with the Securities and Exchange Commission.

Filings for the Company were made under the name ADA-ES, Inc. (File No. 000-50216) prior to July 1, 2013, the effective date of our reorganization, and under the name Advanced Emissions Solutions, Inc. (File No. 000-54992) starting on July 1, 2013. Filings for the Company were made under the name Advanced Emissions Solutions, Inc. (File No. 001-37822) starting on July 6, 2016.

(c)The following financial statements are included in this report pursuant to Regulation S-X:
(c)The following financial statements are included in this report pursuant to Regulation S-X Rule 3-09:
(1)Tinuum Group, LLC and Subsidiaries;
(1)    Tinuum Group, LLC and Subsidiaries;
a. Consolidated Financial Statements, December 31, 2017, 20162020 and 2015 (With2019 (with Independent Auditors' Reports Thereon)thereon);

103

TINUUM GROUP,












Tinuum Group, LLC AND SUBSIDIARIES
and Subsidiaries
CONSOLIDATED FINANCIAL STATEMENTS
As of December 31, 2017 and 2016
And for the Years Ended
December 31, 2017, 2016,2020 and 20152019



104













TABLE OF CONTENTS

Page
REPORT OF INDEPENDENT AUDITORS
FINANCIAL STATEMENTS
CONSOLIDATED BALANCE SHEETSPage
REPORTS OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRMS
CONSOLIDATED STATEMENTS OF OPERATIONS
FINANCIAL STATEMENTS
Consolidated Balance Sheets
Consolidated Statements of OperationsCONSOLIDATED STATEMENTS OF MEMBERS' EQUITY
Consolidated Statements of Members' EquityCONSOLIDATED STATEMENTS OF CASH FLOWS
Consolidated Statements of Cash FlowsNOTES TO CONSOLIDATED FINANCIAL STATEMENTS
Notes to Consolidated Financial Statements



105


Report of Independent Registered Public Accounting FirmAuditors


To theThe Board of Managers and Members of
Tinuum Group, LLC


OpinionReport on the Financial Statements

We have audited the accompanying consolidated balance sheetfinancial statements of Tinuum Group, LLC and its subsidiaries, (the “Company”)which comprise the consolidated balance sheets as of December 31, 2017,2020 and 2019, and the related consolidated statements of operations, members’ equity, and cash flows for the yearyears then ended, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion,statements.
Management’s Responsibility for the Financial Statements
Management is responsible for the preparation and fair presentation of these consolidated financial statements present fairly, in all material respects, the consolidated financial position of the Company as of December 31, 2017, and the consolidated results of their operations and their cash flows for the year then ended, in conformityaccordance with accounting principles generally accepted in the United States of America.

Basis for Opinion

TheseAmerica; this includes the design, implementation, and maintenance of internal control relevant to the preparation and fair presentation of consolidated financial statements that are the responsibility of the Company’s management. free from material misstatement, whether due to fraud or error.
Auditor’s Responsibility
Our responsibility is to express an opinion on the Company’sthese consolidated financial statements based on our audit. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

audits. We conducted our audit in accordance with the standards of the PCAOB andaudits in accordance with auditing standards generally accepted in the United States of America. Those standards require that we plan and perform the auditaudits to obtain reasonable assurance about whether the consolidated financial statements are free offrom material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, anmisstatement.
An audit of their internal control over financial reporting. As part of our audit we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audit includedinvolves performing procedures to assessobtain audit evidence about the amounts and disclosures in the consolidated financial statements. The procedures selected depend on the auditor’s judgment, including the assessment of the risks of material misstatement of the consolidated financial statements, whether due to errorfraud or fraud,error. In making those risk assessments, the auditor considers internal control relevant to the entity’s preparation and performing procedures to respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audit also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overallfair presentation of the consolidated financial statements. We believe that our audit provides a reasonable basis for our opinion.

/s/ Moss Adams LLP

Denver, Colorado
March 2, 2018

We have served as the Company’s auditor since 2017.


INDEPENDENT AUDITOR'S REPORT


Board of Managers
Tinuum Group, LLC


We have audited the accompanying consolidated balance sheet of Tinuum Group, LLC and subsidiaries (the “Company”) as of December 31, 2016, and the related consolidated statements of operations, members’ equity, and cash flows for each of the two years in the period ending December 31, 2016. These financial statements are the responsibility of the Company’s management. Our responsibility isorder to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States) and in accordance with auditing standards generally accepted in the United States of America. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designingdesign audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company’sentity’s internal control over financial reporting.control. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supportingevaluating the amounts and disclosures in the financial statements, assessing theappropriateness of accounting principlespolicies used and the reasonableness of significant accounting estimates made by management, as well as evaluating the overall presentation of the consolidated financial statement presentation. statements.
We believe that our auditsthe audit evidence we have obtained is sufficient and appropriate to provide a reasonable basis for our audit opinion.

Opinion
In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Tinuum Group, LLC and its subsidiaries as of December 31, 2016,2020 and 2019, and the results of their operations and their cash flows for each of the two years then ended in the period ending December 31, 2016, in conformityaccordance with accounting principles generally accepted in the United States of America.

Emphasis of Matter Regarding Going Concern
The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a going concern. As discussed in Note 1 to the consolidated financial statements, with cash inflows ending in January 2022 and with legislation to extend the production tax credit (PTC) expiration date not in process or having been passed, management has assumed the reduced emissions fuel (REF) facilities and the related PTCs will expire as scheduled by December 31, 2021, and has stated that substantial doubt exists about the Company’s ability to continue as a going concern. Management’s evaluation of the events and conditions and management’s plans regarding these matters are also described in Note 1. The consolidated financial statements do not include any adjustments that might result from the outcome of this uncertainty. Our opinion is not modified with respect to this matter.

/s/ Hein & AssociatesMoss Adams LLP


Denver, Colorado
March 6, 20178, 2021

TINUUM GROUP, LLC AND SUBSIDIARIES106
CONSOLIDATED BALANCE SHEETS
As of December 31, 2017 and 2016
(in thousands)




 ASSETS
    
 2017 2016
 CURRENT ASSETS   
    Cash$13,309
 $10,897
    Accounts receivable5,720
 3,790
    Related party receivables969
 
    Inventory11,070
 9,857
    Prepaid royalties
 40
 Total current assets31,068
 24,584
    
 NON-CURRENT ASSETS   
    Fixed assets, net65,228
 68,469
    Deferred tax assets224
 1,189
    Other assets, net10,140
 13,963
 Total non-current assets75,592
 83,621
    
 TOTAL ASSETS$106,660
 $108,205


 ASSETS
20202019
 CURRENT ASSETS
Cash and cash equivalents$50,540 $44,441 
Accounts receivable8,029 6,086 
Income tax receivable5,966 904 
Contract receivables – current47,264 42,916 
Contract costs – current5,541 21,503 
Inventory13,730 11,866 
Other current assets11,370 1,661 
 Total current assets142,440 129,377 
Fixed assets, net24,508 50,323 
Contract receivables – long term4,122 51,587 
Contract costs – long term— 5,226 
Other assets, net19 17,780 
TOTAL ASSETS$171,089 $254,293 

The following table presents certain assets of the consolidated variable interest entities (VIEs)("VIEs"), which are included in the Consolidated Balance Sheets above. The assets in the table below include those assets that can only be used to settle obligations of consolidated VIEs, presented on the following page, and are in excess of those obligations. Additionally, the assets in the table below include third-party assets of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation.


Assets of consolidatedConsolidated VIEs to be usedUsed to settle obligationsSettle Obligations of consolidatedConsolidated VIEs

20202019
ASSETS
Cash and cash equivalents$32,050 $31,481 
Accounts receivable25 22 
Income tax receivable5,966 904 
Inventory13,724 11,840 
Other current assets403 381 
Non-current assets10,631 13,934 
 TOTAL ASSETS$62,799 $58,562 

  
 2017 2016
ASSETS   
Cash$6,919
 $6,213
Accounts receivable1,093
 526
Inventory11,017
 6,059
Prepaid expenses1,049
 2,771
Non-current assets7,043
 2,684
 TOTAL ASSETS$27,121
 $18,253











Statement continues on the next page




The accompanying notes are an integral part of the consolidated financial statements.107


113

TINUUM GROUP, LLC AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
As of December 31, 20172020 and 20162019
(in thousands)



 LIABILITIES AND MEMBERS' EQUITY
20202019
 CURRENT LIABILITIES
Accounts payable$6,446 $5,128 
Accrued liabilities6,568 7,076 
Related party payables7,653 10,278 
Deferred revenue – current11,898 9,810 
Line of credit— 5,500 
Note payable to customer – current5,400 21,600 
Secured promissory notes – current6,313 — 
 Total current liabilities44,278 59,392 
Asset retirement obligations2,070 1,449 
Accrued retention compensation3,116 — 
Secured promissory notes – long term— 6,491 
Note payable to customer – long term— 5,400 
 TOTAL LIABILITIES49,464 72,732 
MEMBERS' EQUITY
Members’ equity attributable to Class A Members59,221 117,006 
Member equity attributable to Class B Member18,769 28,967 
Noncontrolling interests43,635 35,588 
 Total Members' equity121,625 181,561 
 TOTAL LIABILITIES AND MEMBERS' EQUITY$171,089 $254,293 
 LIABILITIES AND MEMBERS' EQUITY
    
 2017 2016
 CURRENT LIABILITIES   
    Accounts payable$2,431
 $1,967
    Accrued liabilities3,345
 5,197
    Related party payables7,498
 5,734
    Deferred revenue35,006
 30,219
 Total current liabilities48,280
 43,117
    
 NON-CURRENT LIABILITIES   
    Secured promissory note7,284
 6,794
    Deferred revenue - long-term
 3,188
    Asset retirement obligation1,066
 1,474
 Total non-current liabilities8,350
 11,456
    
 TOTAL LIABILITIES56,630
 54,573
    
 TEMPORARY CLASS B PREFERRED EQUITY821
 18,250
    
 OTHER MEMBERS' EQUITY   
    Members' equity attributable to Class A Members40,452
 26,475
    Noncontrolling interests8,757
 8,907
 Total members' equity49,209
 35,382
    
 TOTAL LIABILITIES AND MEMBERS' EQUITY$106,660
 $108,205


The following table presents certain liabilities of consolidated VIEs, which are included in the Consolidated Balance Sheets above. The liabilities in the table below include third-party liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. The liabilities also exclude intercompany amounts where creditors have recourse against the general credit of Tinuum Group, LLC. However, the secured promissory note has a limited guarantee provided by Tinuum Group, LLC.


Liabilities of consolidatedConsolidated VIEs for which creditors do not have recourse againstWhich Creditors Do Not Have Recourse Against the general creditGeneral Credit of Tinuum Group, LLC
20202019
LIABILITIES
Accounts payable and accrued liabilities$7,859 $6,745 
Related party payables3,747 5,462 
Secured promissory notes6,313 6,491 
Non-current liabilities1,670 1,091 
TOTAL LIABILITIES$19,589 $19,789 
 
 2017 2016
LIABILITIES   
Accounts payable and accrued liabilities$6,654
 $4,864
Secured promissory note7,284
 6,794
Non-current liabilities575
 401
TOTAL LIABILITIES$14,513
 $12,059



The accompanying notes are an integral part of the consolidated financial statements.



108
114

TINUUM GROUP, LLC AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF OPERATIONS
For the Years Ended December 31, 2017, 2016,2020 and 20152019
(in thousands)



20202019
 REVENUES
Reduced emissions and unrefined fuel$619,101 $500,404 
REF Facility revenues – over time89,478 142,028 
REF Facility revenues – point-in-time(1,129)45,608 
Other594 733 
 TOTAL REVENUES708,044 688,773 
COST OF SALES (exclusive of depreciation shown separately below)
Feedstock purchases619,101 500,404 
Cost of REF facilities(12)11,509 
Chemicals27,496 22,521 
Site and production fees35,950 27,523 
Royalties and fees18,860 21,840 
 TOTAL COST OF SALES701,395 583,797 
 GROSS PROFIT6,649 104,976 
OPERATING EXPENSES11,217 8,983 
IMPAIRMENT OF REF FACILITIES2,968 — 
DEPRECIATION AND AMORTIZATION EXPENSE28,175 16,361 
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES15,648 12,297 
(LOSS) INCOME FROM OPERATIONS(51,359)67,335 
 OTHER (INCOME) EXPENSE
Interest income(1,744)(2,526)
Other expense655 1,674 
Interest expense1,671 482 
 TOTAL OTHER (INCOME) EXPENSE582 (370)
(LOSS) INCOME BEFORE INCOME TAXES(51,941)67,705 
Deferred tax benefit(18,979)(904)
Income tax expense1,137 1,369 
NET (LOSS) INCOME(34,099)67,240 
Loss attributable to noncontrolling interests91,501 78,544 
NET INCOME AVAILABLE TO MEMBERS$57,402 $145,784 

 2017 2016 2015
 REVENUES     
    Coal$263,673
 $186,176
 $533,365
    Lease129,378
 120,400
 153,931
    Other346
 2,407
 8,201
 TOTAL REVENUES393,397
 308,983
 695,497
      
 COST OF SALES (exclusive of depreciation     
    shown separately below)     
    Coal purchases263,662
 186,152
 533,466
    Chemicals10,079
 7,941
 23,271
    Site and production fees13,727
 15,934
 19,286
    Royalties and broker fees10,377
 6,651
 11,058
 TOTAL COST OF SALES297,845
 216,678
 587,081
      
 GROSS PROFIT95,552
 92,305
 108,416
      
 OPERATING EXPENSES9,057
 7,637
 10,586
      
 SELLING, GENERAL AND ADMINISTRATIVE     
   EXPENSES8,935
 11,492
 9,571
      
 DEPRECIATION AND AMORTIZATON EXPENSE4,966
 4,533
 3,248
 INCOME FROM OPERATIONS72,594
 68,643
 85,011
      
 OTHER EXPENSE     
    Other expense, net2,644
 5,903
 823
    Interest expense482
 447
 160
 TOTAL OTHER EXPENSE3,126
 6,350
 983
      
INCOME BEFORE STATE INCOME TAXES69,468
 62,293
 84,028
      
    State income tax expense1,394
 2,425
 1,220
      
NET INCOME68,074
 59,868
 82,808
      
 Class B holders preferred return(1,712) (3,901) (6,157)
 Loss attributable to noncontrolling interests43,474
 27,234
 10,675
 NET INCOME AVAILABLE TO     
   CLASS A MEMBERS$109,836
 $83,201
 $87,326


The accompanying notes are an integral part of the consolidated financial statements.



109
115

TINUUM GROUP, LLC AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF MEMBERS' EQUITY
Years Ended December 31, 2017, 2016,2020 and 20152019
(in thousands)



 Class A MembersClass B Member Non-Controlling Interests Total Members' Equity
BALANCES, JANUARY 1, 2019$49,102 $16,983 $16,510 $82,595 
Change in accounting principle74,463 13,141 — 87,604 
Member contributions— — 97,622 97,622 
Member distributions(130,475)(23,025)— (153,500)
Net income available to members123,916 21,868 — 145,784 
Net loss attributable to noncontrolling interests— — (78,544)(78,544)
BALANCES, DECEMBER 31, 2019117,006 28,967 35,588 181,561 
Member contributions— — 113,465 113,465 
Member distributions(106,577)(18,808)— (125,385)
Member distributions, noncontrolling interests— — (13,917)(13,917)
Net income available to members48,792 8,610 — 57,402 
Net loss attributable to noncontrolling interests— — (91,501)(91,501)
BALANCES, DECEMBER 31, 2020$59,221 $18,769 $43,635 $121,625 

   Other Members Equity (Deficit)
  Temporary Class B Members  Class A Members  Noncontrolling Interest  Total Other Members' Equity (Deficit)
BALANCES, JANUARY 1, 2015$45,521
 $(63,027) $5,525
 $(57,502)
Class B holders preferred return6,157
 
 
 
Member contributions
 
 10,713
 10,713
Member distributions(3,053) (17,301) 
 (17,301)
Reclassification of member equity(18,177) 18,177
 
 18,177
Net income available to Class A Members
 87,326
 
 87,326
Net loss attributable to noncontrolling interest
 
 (10,675) (10,675)
BALANCES, DECEMBER 31, 2015$30,448
 $25,175
 5,563
 $30,738
Class B holders preferred return3,901
 
 
 
Member contributions
 
 30,578
 30,578
Member distributions(14,700) (83,300) 
 (83,300)
Reclassification of member equity(1,399) 1,399
 
 1,399
Net income available to Class A Members
 83,201
 
 83,201
Net loss attributable to noncontrolling interest
 
 (27,234) (27,234)
BALANCES, DECEMBER 31, 2016$18,250
 $26,475
 8,907
 $35,382
Class B holders preferred return1,712
 
 
 
Member contributions
 
 43,324
 43,324
Member distributions(17,250) (97,750) 
 (97,750)
Reclassification of member equity(1,891) 1,891
 
 1,891
Net income available to Class A Members
 109,836
 
 109,836
Net loss attributable to noncontrolling interest
 
 (43,474) (43,474)
BALANCES, DECEMBER 31, 2017$821
 $40,452
 $8,757
 $49,209


The accompanying notes are an integral part of the consolidated financial statements.



110
116

TINUUM GROUP, LLC AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWsFLOWS
For the Years Ended December 31, 2017, 2016,2020 and 20152019
(in thousands)

20202019
CASH, BEGINNING OF YEAR$44,441 $26,211 
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income(34,099)67,240 
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization28,175 16,361 
Amortization of contract costs21,188 871 
Noncash operating lease expense176 159 
Assets sold as part of REF Facility transaction(12)11,509 
Loss on sale of assets264 1,803 
Impairment of REF facilities2,968 — 
Loss on removal of asset retirement obligation(194)(129)
Accretion of asset retirement obligation184 134 
Effects of changes in operating assets and liabilities:
Accounts receivable(1,943)1,188 
Related party receivables— 6,294 
Income tax receivable(5,062)(904)
Contract receivables43,117 (7,387)
Inventory(1,864)2,766 
Other assets8,047 263 
Accounts payable and accrued liabilities1,010 2,033 
Accrued retention compensation3,116 — 
Payments on operating leases(200)(176)
Related party payables(2,196)1,524 
Deferred revenue2,088 (13,795)
Settlement of asset retirement obligation— (230)
           Net cash provided by operating activities64,763 89,524 
 CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures for fixed assets(5,648)(17,891)
Proceeds from sale of fixed assets99 206 
           Net cash used in investing activities(5,549)(17,685)
 CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings under line of credit8,900 7,500 
Repayments under line of credit(14,400)(2,000)
Borrowings (repayments) on note payable to customer(21,600)— 
Repayments under secured promissory note(178)(3,231)
Contributions from noncontrolling interest members113,465 97,622 
Distributions paid to minority interest members(13,917)— 
Distributions paid to members(125,385)(153,500)
           Net cash used in financing activities(53,115)(53,609)
 NET INCREASE IN CASH6,099 18,230 
 2017 2016 2015
 CASH, BEGINNING OF YEAR$10,897
 $6,183
 $3,870
      
 CASH FLOWS FROM OPERATING ACTIVITIES     
    Net income68,074
 59,868
 82,808
    Adjustments to reconcile net income to net     
       cash provided by operating activities:     
       Depreciation and amortization4,966
 4,533
 3,248
       Loss on sale of assets2,663
 5,905
 859
       Amortization of prepaid royalties
 3,012
 3,540
       Accretion of asset retirement obligation139
 122
 94
       Deferred state taxes965
 (972) 180
    Effects of changes in operating assets and liabilities:     
       Accounts receivable(1,930) 13,071
 (12,845)
       Related party receivables(969) 4,560
 425
       Prepaid expenses and other assets3,858
 (211) (13,689)
       Inventory(1,213) 310
 (672)
       Accounts payable and accrued liabilities(1,388) (14,788) 16,334
       Related party payables1,721
 943
 772
       Settlement of asset retirement obligation(348) (108) (126)
       Deferred revenue1,599
 3,478
 (43,178)
           Net cash provided by operating activities78,137
 79,723
 37,750
      
 CASH FLOWS FROM INVESTING ACTIVITIES     
    Capital expenditures for fixed assets(4,539) (2,846) (30,061)
           Net cash used in investing activities(4,539) (2,846) (30,061)
      
 CASH FLOWS FROM FINANCING ACTIVITIES     
    Borrowings (repayments) under secured promissory note, net490
 (741) 534
    Borrowings under line of credit5,000
 
 4,000
    Repayments under line of credit(5,000) (4,000) 
    Noncontrolling member contributions43,324
 30,578
 10,444
    Members' distributions(115,000) (98,000) (20,354)
           Net cash used in financing activities(71,186) (72,163) (5,376)
 NET INCREASE IN CASH2,412
 4,714
 2,313
 CASH, END OF YEAR$13,309
 $10,897
 $6,183
      
SUPPLEMENTAL DISCLOSURE     
Cash paid for interest$479
 $454
 $121
Cash paid for taxes1,200
 2,936
 1,024
      
NON-CASH TRANSACTIONS     
    Capital expenditures included in current liabilities$43
 $1,113
 $1,995
    Asset retirement obligation recorded (removed)(199) 381
 299

The accompanying notes are an integral part of the consolidated financial statements.



111
117

TINUUM GROUP, LLC AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2020 and 2019
(in thousands)
20202019
 CASH, END OF YEAR$50,540 $44,441 
SUPPLEMENTAL DISCLOSURES
Cash paid for interest$1,824 $389 
Cash paid for taxes1,212 1,313 
NON-CASH TRANSACTIONS
   Customer note for contract costs$— $27,000 
   Capitalized contract costs— 600 
Capital expenditures included in related party payables429 1,951 
Asset retirement obligation layer631 370 
The accompanying notes are an integral part of the consolidated financial statements.

112

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 20152020 and 2019
(in thousands)



NOTE 1 - SIGNIFICANT ACCOUNTING POLICIES


Tinuum Group, LLC (together with its subsidiaries, “Tinuum”"Tinuum" or “the Company”"TG" or the "Company") develops, manages, sells and leases facilities ("REF Facilities") used in the production and sale of reduced emissions fuel (“REF Facilities”).fuel. The production and sale of reduced emissions fuel (a/k/a refined coal)(refined coal or "REF") via these REF Facilities qualifies for production tax credits that are available under Section 45 of the Internal Revenue Code (“PTCs”("PTCs"). The value of the PTC is adjusted annually based on inflation adjustment factors published in the Federal Register. The 2017, 20162020 and 20152019 PTC rates were $6.909, $6.810, $6.710,$7.301 and $7.173 per ton of reduced emissions fuelREF produced, respectively.


Tinuum is owned 42.5% by ADA-ES, Inc. (“ADA”("ADA"), 42.5% by NexGen Refined Coal, LLC (“NexGen”("NexGen") (collectively, Class A Members), and 15% by GSFS Investments I Corp. (“GSFS”("GSFS" or the “Class"Class B Member”Member"). ADA, NexGen, and GSFS are collectively referred to herein as the “Members.”"Members."


Tinuum placed in service two REF Facilities prior to January 1, 2010 and 26 additional REF Facilities prior to January 1, 2012. Each REF Facility has demonstrated the required emissions reductions from the production of reduced emissions fuelREF to qualify for PTCs. The reduced emissions fuelREF produced at these REF Facilities is burned at coal-fired generation stations (the owner of which is a “Generator”"Generator") and is expected to continue to qualify for PTCs for a period of ten10 years following the applicable placed in-service date (expiring at certain dates in 2019 and 2021, respectively).service date. The two REF Facilities that were placed in service prior to January 1, 2010 no longer qualified for PTCs as of December 31, 2019. The remaining 26 REF Facilities that were placed in service prior to January 1, 2012 will no longer qualify for PTCs as of December 31, 2021.


At December 31, 20172020 and 2016,2019, respectively, 1723 and 1320 REF Facilities had been sold to or were under lease with third partythird-party investors (“("TP Investors”Investors") who utilize the REF Facilities to produce reduced emissions fuel.REF (each of these REF Facilities is owned or leased by a "Producer Entity"). Some of the Producer Entities are owned or leased exclusively by a TP Investor and some are owned or leased by a TP Investor with some ownership percentage retained by the Company. The REF Facilities are located at coal-fired generation stations throughout the United States.

In instances where Tinuum has also at times produced reduced emissions fuel from REF Facilities for the benefit of its Members. As of December 31, 2017 and 2016 none of the REF Facilities were retained to produce reduced emissions fuel for the Members. Tinuum does retainretains certain membershipmember interests in TP Investor REF Facilities which generatea Producer Entity, PTCs thatgenerated are allocated to Tinuum in proportion to its membership interests. The PTCsmember interests and are therefore available for the benefit of Tinuum’s Members.


Tinuum Services, LLC (“TS”("TS"), operates and maintains the REF Facilities under respective operating and maintenance agreements. TS is owned 50% each by ADA and NexGen and is not consolidated with the accounts of Tinuum. TP Investors of REF Facilities and Tinuum for retained REF Facilities, pay TS, subject to certain limitations, a fee for procuring certain patented and proprietary chemical additives, an operating fee for the production of reduced emissions fuel,REF, and for the other operating and maintenance costs associated with running the REF Facilities.


Basis of Presentation


The accompanying consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States (“GAAP”of America ("GAAP"). The accompanying consolidated financial statements and include the accounts of the Company and several variable interest entities (“VIEs”("VIEs"), for which Tinuum is the primary beneficiary. An entity is referred to as a VIE if it meets any of the following criteria outlined in Accounting StandardsStandard Codification ("ASC") ASC 810 - Consolidation, (“ ("ASC 810”810"), which are: (i) the entity has equity that is insufficient to permit the entity to finance its activities without additional subordinated financial support from other parties; or (ii) the entity has equity investors that, cannot make significant decisions aboutas a group, lack the entity’s operationscharacteristics of a controlling financial interest; or that do not absorb their proportionate share of(iii) the entity’s expected losses or expected returns.entity is structured with non-substantive voting rights.


The Company consolidates a VIE when it has both the power to direct the activities that most significantly impact the VIE’s economic performance and a right to receive benefits or the obligation to absorb losses of the entity that could be potentially significant to the VIE (i.e., it is the primary beneficiary).


All intercompany balances and transactions have been eliminated in consolidation.


113

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2020 and 2019
(in thousands)
Going Concern

Currently, with cash inflows ending in January 2022 and with legislation to extend the PTC expiration date not in process or having been passed, management has assumed the REF Facilities and the related PTCs will expire as scheduled by December 31, 2021. To date, management has not developed an alternative business strategy and thus management currently expects that 100% of the business operations will be wound down in 2022, which decision will be subject to approval by the Members.

The Company’s line of credit expired on December 31, 2020 and debt financing is no longer available.

Management has budgeted, and is planning, to reserve enough cash from the final cash inflows of 2021 and 2022 to satisfy anticipated remaining liabilities and obligations, including identified contingent liabilities that have been asserted by December 31, 2021. These cash reserves will be utilized to conduct an orderly wind down of business operations.

No new business opportunities or cash inflows are expected to occur. The only exception to management’s plan would be if the U.S. Congress were to extend the PTC expiration date beyond December 31, 2021. If that event were to occur in a timely manner or prior to decommissioning of REF Facilities, management would seek to renegotiate its contracts with the various TP Investors and the host stations at which the REF Facilities are located and to continue to operate the business until the latter expiration date.

Management has concluded that these factors, in the aggregate, raise substantial doubt about the Company’s ability to continue as a going concern. The consolidated financial statements have been prepared on a basis which assumes the Company will be able to continue as a going concern and contemplates the realization of assets and satisfaction of liabilities in the normal course of business, and do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classifications of liabilities that may result from uncertainty related to the Company’s ability to continue as a going concern.

Use of Estimates


The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Management bases its estimates on
TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 2015
(in thousands)

historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Significant estimates include the assumption thatestimated contingent revenues recognized related to revenues recognized at a point-in-time, the Company’sestimated useful lives associated with REF Facilities can be utilized after the expiration of the Section 45 PTC period.and assumptions associated with asset retirement obligations ("ARO"). Ultimate realization of assets and settlement of liabilities in the future could differ from those estimates.


During the third quarter of 2019, the Company reevaluated the estimated useful life of its REF Facilities. As a result, the Company determined that the estimated useful life of the REF Facilities should be reduced from 20 years as originally estimated to the remainder of the 10 year period from the date the REF Facility was originally placed in service. The Company accounted for the change in the useful life of the REF Facilities as a change in accounting estimate beginning August 1, 2019. For the year ended December 31, 2019, the impact of the change in estimate resulted in a decrease in net income of $11,644.

Cash and Cash Equivalents


The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents. The carrying value approximates fair value due to the short-term nature of these instruments. The Company maintains its cash and cash equivalents in accounts with a local financial institution. These accounts at times may exceed federally insured limits. The Company has not experienced any losses in these accounts. The Companyaccounts and believes it is not exposed to any significant credit risk related to cash.cash and cash equivalents.


Accounts Receivable


Accounts receivable consist primarily of payments due from TP Investors that own or lease the REF Facilities. The carrying amount of accounts receivable may be reduced by a valuation allowance that reflects management's best estimate of amounts
114

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2020 and 2019
(in thousands)
that will not be collected. Under the Company’s agreements, interest can accrue on delinquent balances. No interest on delinquent balances was recorded for the years ended December 31, 2017, 20162020 and 2015.2019. Any allowance for doubtful accounts is based on management’s assessment of the collectability of specific customer accounts and the aging of the accounts receivable. If there is a deterioration of a major customer’s credit worthiness or actual defaults are higher than the historical experience, management’s estimates of the recoverability of amounts due to the Company could be adversely affected. As of December 31, 20172020 and 2016,2019, no allowance for doubtful accounts was considered necessary.


Inventory


Inventory is comprised primarily of feedstock coalfuel and chemicals used in the production and sale of reduced emissions fuelREF at REF Facilities. Inventory is valued at the lower of cost or net realizable value using the average cost.cost method.


Fixed Assets


Fixed assets are stated at historical cost less accumulated depreciation and consist primarily of the REF Facilities and ancillary equipment, including major additions and improvements less accumulated depreciation.improvements. Expenditures for major improvements are capitalized, while maintenance and repair costs that do not significantly improve the related asset or extend its useful life are charged to expense as incurred. For financial reporting purposes, depreciation is calculated using the straight-line method over the estimated useful lives of the assets ranging from 3 to 2010 years. Depreciation expense was $4,961, $4,528, and $3,243, for the years ended December 31, 2017, 2016 and 2015, respectively.


The Company records aan ARO liability for asset retirement obligations (“ARO”) equal to the fair value of the estimated cost to retire a REF Facility. The ARO liability is initially recorded in the period in which the obligation meets the definition of a liability, which is generally when a REF Facility is installed at a generation station.station ("Site"). The ARO liability is estimated by the Company based on legal removal requirements, historical removal experience, and uses anticipated future inflation rates. When the liability is initially recorded, the Company increases the carrying amount of the related long-lived asset by an amount equal to the original liability. The liability is increased over time to reflect the change in its present value, and the capitalized cost is depreciated over the useful life of the related long-lived asset. The ARO liability is removed when the Company is relieved of its removal obligation due to either completion of the removal activities at a generation station or a transfer of the responsibility for the REF Facility removal to a third party.third-party. The Company reevaluates the adequacy of its recorded ARO liability at least annually. Actual costs of asset retirements, such as removing the REF Facility from a generation station and related site restoration, are charged against the related liability. Any difference between costs incurred upon settlement of an ARO and the recorded liability is recognized in Other Expenseother expense as a gain or loss in the Company’s Statementsconsolidated statements of Operations.operations.


Intangible Assets


Tinuum has two exclusive licenses from ADA for the patented and proprietary “CyClean™”"CyClean™" and “M-45™”"M-45™" technologies related to the production and sale of reduced emissions fuel.REF. The patents underlying the CyClean™ technology license expire beginning in 2021; however, the license agreement includes potential future patents related to the technology. The costs associated with the exclusive CyClean™ license are included in Otherother assets, net on the consolidated balance sheets and are being amortized over the useful economic life of the technology, or approximately 14 years, using the straight-line method. Amortization expense was $5 for each of the years ended December 31, 2017, 2016,2020 and 2015.2019.

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 2015
(in thousands)


Impairment of Long-Lived Assets


The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of carrying amount or fair value less costs to sell. As part of the Company’s on-going monitoring of its REF Facilities, the Company evaluated the REF Facility assets for potential impairment as of December 31, 2020. Given the expiration of the original PTC period, December 31, 2021, the fact that no extension of the PTC period has been passed by Congress, and the fact that the Company does not have an expectation of additional future cash flows associated with the REF Facilities beyond the PTC period, any REF Facilities that have not been invested by TP Investors have been considered to be impaired. Impairment was assessed based upon the future
115

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2020 and 2019
(in thousands)
undiscounted cash flows of each REF Facility as compared to its net book value. As a result, the Company recognized an impairment loss of $2,968 as of and for the year ended December 31, 2020. At December 31, 2017 and 2016,2019, there were no such impairments.


Revenue Recognition


Coal RevenuesREF Facilities


In connectionThe Company identifies performance obligations by reviewing the combination of customer agreements for material distinct goods and services. Goods and services are distinct when the customer can benefit from them on their own and the promises to transfer these items are separately identifiable from other promises within the contract. When the Company is contracted to provide a single promise (an integrated system), it is treated as a single performance obligation as goods and services are provided with the operationsame pattern of transfer. The Company has identified the provision of the technology sublicense combined with the use of the REF Facility to be a single performance obligation.

REF Facility revenues are recognized based upon the type of contract with the TP Investor. Generally, the Company has three types of contracts with customers (a) Leases, (b) Member Interest Purchase Agreements ("MIPA") and (c) Asset Purchase Agreements ("APA"). In all instances the contracts relate to the use of the REF Facility and the related sublicensed patented technology which is necessary for each Producer Entity to produce REF utilizing the REF Facility.

Depending upon the agreement, the Company may receive fixed payments or a combination of fixed and variable payments over the contract term. Variable payments are determined based upon the expected amount of REF Facilities byproduction during the defined period. Certain prepayments are received upon execution of TP Investor agreements. Significant judgments and estimates are used in the Company’s revenue policies. Throughout the revenue cycle, the Company evaluates contractual evidence, monitors performance and evaluates variable consideration changes.

For the Leases and MIPA contracts, revenue is recognized "over time" using the output method, utilizing actual REF production volumes. In these agreements where a prepayment is received, that amount is recorded as deferred revenue and is amortized into revenue in accordance with the amortization period of the respective TP Investor agreement. Contingent consideration associated with Leases or MIPAs is recorded based upon actual REF production volumes achieved, constrained by any contractual limitations or by production volumes that management estimates could occur.

Revenues recorded related to the APAs are recorded when the Company purchaseshas completed delivery of the REF Facility and takeshas transferred title and control of the REF Facility to the TP Investor. These revenues are recognized at a "point-in-time" based upon the net present value of the expected fixed purchase payments plus management’s estimate of any variable payments associated with the sale. Additionally, since the payments are made quarterly over a time period exceeding one year, a financing component exists to these transactions. For the years ended December 31, 2020 and 2019, interest recorded related to these contracts was $1,619 and $2,346, respectively, and is recorded as interest income in the statement of operations.

As a result of the recording of APA revenues as of a point-in-time, future cash flows will be received according to the contractual payment schedules, but no future revenues, other than changes in estimates, will be recognized for these contracts. Changes in estimates for variable consideration can occur for a variety of reasons, including but not limited to (i) annual inflation adjustment factors being different from what was originally estimated and (ii) changes in actual versus expected production volumes of REF. For the year ended December 31, 2020, the impact of the change in estimate resulted in a decrease in revenues of $1,129.

Generally, the REF Facility is collateral for the outstanding contract receivable balances recorded by Tinuum. The Company recognizes a contract receivable when the Company transfers control of a REF Facility to the customer in advance of receiving consideration. Contracts with variable consideration are billed quarterly in arrears, once production volumes are known, under similar payment terms.

116

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2020 and 2019
(in thousands)
Reduced Emissions and Unrefined Fuel

The Company’s consolidated VIEs, which are Producer Entities, purchase and take title to feedstock coalfuel under purchase agreements with each respective Generator or other supplier of feedstock coal. The Companyfuel. Each Producer Entity purchases the chemicals from third partythird-party vendors and applies them to the feedstock coalfuel to produce reduced emissions fuel in itsREF utilizing REF Facilities. The reduced emissions fuelREF is sold by the Company,Producer Entities, under reduced emissions fuelREF sale agreements, to a Generator or to another third partythird-party at the Company’s discretion of the Manager of each Producer Entity, as permitted under the applicable Generator agreements. The Company performs reduced emissions fuelREF recertification or redetermination testing periodically as required by Section 45 with respect to production and sale of REF at each of its REF Facilities. During the years ended December 31, 2017, 20162020 and 2015,2019, each of the CompanyProducer Entities sold all of its reduced emissions fuelREF and unrefined coalfuel (coal untreated but part of the reduced emissions fuelREF process) to third parties that used the fuel to generate electricity and recorded such amounts as coalreduced emissions and unrefined fuel revenues.


Lease Revenues

Lease revenues are recognized based onEach VIE utilizes the earning of purchase or lease payments under the termscombination of the respective REF Facilities’ TP Investor agreements. Depending onFacility and the agreement,technology license to combine raw materials (feedstock coal and chemicals) to produce REF which is then sold as a separate manufactured product to its customer, the Generator. As a result, the Company may receive fixed payments or a combination of fixedrecognizes both REF Facility revenues and contingent payments. Contingent payments are determined based on the actual amount of reduced emissions and unrefined fuel production duringon a gross basis.

An accounts receivable balance represents the defined period. Certain prepayments are received upon executionCompany’s right to consideration that is unconditional and only the passage of TP Investor agreements and aretime is required before payment of that consideration is due. No allowance for doubtful accounts related to accounts receivable balances or impairment of contract receivables has been recorded as deferred revenue. of December 31, 2020 and 2019.

Deferred revenue is amortized intorecognized when the Company receives consideration in advance of performance.

The Company disaggregates revenue based upon the revenue recognition methodology (over time vs. point-in-time).
Taxes assessed by a governmental agency that are imposed on and concurrent with a specific revenue producing transaction collected by the Company from a customer are excluded from revenues.

Shipping and handling costs are not associated with Tinuum’s products and services and therefore are not included in accordance with the amortization periodrevenues or costs of the respective TP Investor agreement.revenues. No amounts have been recorded for returns, refunds, or other similar obligations.

Other Revenues

Other revenues are comprised primarily of technology sublicense fees and chemical sales to third parties. TP Investors sublicense the Company’s licensed technology for an annual fee. The sublicensed patented technology is necessary for each TP Investor to produce reduced emissions fuel utilizing the REF Facilities.


Income Taxes


The Company, with the consent of its Members, has elected to be taxed under applicable sections of federal and state income tax lawlaws as a limited liability company treated as a partnership for income tax purposes. As a result of this election, no federal income taxes are incurred by the Company. Instead, the Members are liable for income taxes on their pro rata share of the Company's income, deductions, losses, and credits.

In certain states, the Company is taxed based upon shareholder equity or other enterprise considerations. In these instances, the Company records and pays the applicable tax directly to the state agency.
One of the Company’s consolidated VIEs has elected to be a C corporation for federal and state income tax purposes. As a result, that VIE’s income tax provision and related deferred tax assets and liabilities are included within the consolidated financial statements.

Deferred income taxes are provided for temporary differences arising from differences between the financial statement amount and tax basis of assets and liabilities existing at each balance sheet date, using enacted tax rates anticipated to be in effect when the related taxes are expected to be paid. A valuation allowance is established if it is more likely than not that a deferred tax asset will not be realized. The Company includes interest and penalties related to state tax as a component of income tax expense. As of December 31, 2017, the Company’s tax years of 2014 through 2016 are subject to examination by the applicable taxing authorities.


The Company applies the Financial Accounting Standards Board’s (“FASB”) requirementsrequirement of ASC 740, Income Taxes, related to accounting for uncertain tax positions. During the years ended December 31, 2017, 2016 and 2015,In January 2021, the Company has concludedwas notified that there are no significantone of its consolidating VIEs was selected for audit by the IRS. Tinuum is the partnership representative and intends to cooperate with the IRS audit requirements.
TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 2015
(in thousands)

uncertain tax positions that would require recognition or disclosure in the financial statements. As of December 31, 2017 and 2016, the Company made no provision for interest or penalties related to uncertain positions.

In December 2017, legislation known as the Tax Cuts and Jobs Act was signed into law. While this reduced the overall tax rates, since the Company is taxed as a partnership the legislation did not impact the Company’s consolidated financial statements.


Reclassifications


Certain reclassifications have been made to the prior years’ financial statements to conform to the current year presentation. These reclassifications had no effect on previously reported results of operations or member’sMembers’ equity.

117
Recent Accounting Pronouncements

In May 2014, the FASB issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers. As amended by ASU 2015-14, the ASU is effective for public companies for annual reporting periods beginning after December 15, 2017. This standard has been codified as ASC 606 Revenue from Contracts with Customers (ASC 606). The FASB has issued several amendments to the standard, including clarification on accounting for licenses of intellectual property and identifying performance obligations. Under the new standard, revenue is recognized when a customer obtains control of promised goods or services and is recognized in an amount that reflects the consideration which the entity expects to receive in exchange for those goods and services. In addition, the standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers.

The guidance permits two methods of adoption to meet the new standard: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (cumulative catch-up transition method). Tinuum currently anticipates adopting the standard using the full retrospective method. While we continue to assess the potential impacts of the standard, we anticipate that the most significant impact will be on our Other revenues, specifically those related to technology sublicense fees. Under the new revenue standard licensing fees are generally recognized at a point in time as compared to our current practice of recognizing them over time. We expect the revenues from coal to remain substantially unchanged. Lease revenues are specifically excluded from the revenue standard. However, several of the Company’s transactions with TP Investors are recognized as Lease revenues under ASC 360-40, Property, Plant and Equipment - Real Estate Sales, which will be superseded by ASC 606. As a result, a material change in how these contracts and their corresponding revenues are currently recognized could occur. Income from the sale of REF Facilities may also be required to be evaluated under ASC 610 Other Income. We anticipate that these accounting standards will require management to estimate any variable consideration related to the selling price of the REF Facility assets and to assign that variable consideration to identified performance obligations. Such changes could accelerate revenues and could require estimations of variable payments (consideration) which are currently only recognized as revenue as earned based entirely on levels of production. Management will also be required to adjust its estimates of variable consideration for each reporting period. The Company is planning to implement the revenue standard as of January 1, 2019.

In February 2016, the FASB issued ASU 2016-02 Leases (Topic 842) which is intended to increase transparency and comparability of accounting for lease transactions. The ASU will require all leases to be recognized on the balance sheet as lease assets and lease liabilities. Lessor accounting remains similar to the current model but is updated to align with certain changes to the lessee model (i.e., certain definitions, such as initial direct costs, have been updated) and the new revenue recognition standard. Lease classifications by lessors are similar; operating, direct financing, or sales-type. Lessees will need to recognize a right-of-use asset and a lease liability for virtually all of their leases. The liability will be equal to the present value of lease payments. The asset value will be based on the liability, subject to adjustment, such as for initial direct costs. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Classification will be based on criteria that are largely similar to those applied in current lease accounting, but without explicit thresholds. The ASU will require both quantitative and qualitative disclosures regarding key information about leasing arrangements.

The standard is effective for the Company for fiscal years beginning after December 15, 2019. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. Management is currently evaluating the effect of this ASU on its financial statements and disclosures. We currently expect to adopt this standard beginning January 1, 2020. We anticipate this standard will have a significant impact on our consolidated financial statements. The most significant impact will relate to any operating leases associated with our REF Facilities.

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 20152020 and 2019
(in thousands)



Recent Accounting Pronouncements
In June 2016, ASU 2016-13, Financial Instruments-Credit Losses was issued.
Effective January 1, 2019, the Company adopted ASC 606, Revenue from Contracts with Customers, and ASC 842, Leases. As a result, the Company reassessed its revenue generating contracts and determined that the contracts previously accounted for as leases under ASC 840 no longer met the control criteria of a lease and the MIPAs and APAs, previously accounted for via analogy to ASC 840, were required to be analyzed and recorded utilizing the guidance in ASC 606. The ASU introducesCompany recorded the cumulative effect of applying the new revenue standard as an adjustment to the opening balance of Members’ equity.

The Company does not believe that there are any other new accounting models for expected credit losses on financial instruments and applies to: (1) loans, accounts receivable, trade receivables and other financial assets measured at amortized cost, (2) loan commitments and certain other off-balance sheet credit exposures, (3) debt securities and other financial assets measured at fair value and (4) beneficial interests in securitized financial assets. The standard is effective for the Company for fiscal years beginning after December 15, 2020. We do not expect this standard topronouncements that have been issued that might have a material impact on the Company’s consolidatedits financial statements.position or results of operations.

In August 2016, the FASB issued Accounting Standard Update 2016-15, Classification of Certain Cash Receipts and Cash Payments. The new standard is intended to reduce statement of cash flows diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. ASU 2016-15 is effective for fiscal years beginning after December 15, 2018 and should use the retrospective transition method. The Company does not anticipate any material impact from the adoption of this standard.
In January 2017, the FASB issued ASU 2017-01, Business Combination: Clarifying the Definition of a Business. The amendments in this ASU change the definition of a business to assist with evaluating when a set of transferred assets and activities is a business. The Company is required to adopt the guidance January 1, 2019; however early adoption on an individual transaction basis is permitted. The Company has early adopted this standard for its 2017 transactions. As a result, any 2017 transactions with TP Investors have been evaluated utilizing the updated definition of a group of assets or a business as defined in the accounting standard.

In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets(Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets. ASU 2017-05 clarifies the scope of Subtopic 610-20, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets, which provides guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with noncustomers. The amendments in ASU 2017-05 are effective for annual reporting periods beginning after December 15, 2018. The Company believes this could have a material impact on how sales of REF Facilities are recorded which could include recording revenues currently considered lease revenues recognized over time as revenues to be recorded at a point in time.

NOTE 2 - FIXED ASSETS

Reduced Emissions Fuel Facilities


Reduced emissions fuel production facilitiesEach of the REF Facilities and their related components represent the 28 REF Facilities that were placed in service by the Company in 2009 and 2011 and have demonstrated the qualified emissions reductions to qualify for PTCs. REF Facilities are stated at historical cost. Depreciation is calculated using the straight-line method over a 20-year10 year period, commencing with the original placed in service date in 2009 or 2011, as appropriate. The two REF Facilities originally placed in service in 2009 were fully depreciated as of December 31, 2019.


Furniture, Fixtures and Equipment

Furniture, fixtures, and equipment is comprised of office furniture, fixtures and office equipment, including those under finance leases. These assets are recorded at cost and depreciated using the straight-line method with estimated useful lives ranging from 3 to 8 years.

The following table summarizes the components of gross and net carrying amounts for fixed assets as of December 31, 2020 and 2019:
20202019
REF Facilities and related equipment$91,399 $86,832 
Assets associated with removal obligations1,637 1,129 
Furniture, fixtures, equipment and other1,397 1,414 
ROU assets711 702 
Accumulated depreciation(67,668)(39,754)
Impairment reserve(2,968)— 
Fixed assets, net$24,508 $50,323 
Depreciation expense was $28,170 and $16,356, for the years ended December 31, 2020 and 2019, respectively.
Under the site license agreements between the Producer Entities or Tinuum and the Generators, Tinuum may be required to return the siteSite upon which the REF Facility is located at a generation station (“Site”) to its original condition at the end of the applicable contract period. In instances where the applicable agreements place this responsibility on the Company, the Company has recorded a liability for an ARO equal to the fair value of the estimated cost to retire the REF Facility and return each Site to its original condition. The ARO liability was estimated by the Company using estimated and historichistorical facility removal costs and anticipated future inflation rates. This estimated future value was discounted to its present value using the Company’s credit-adjusted risk-free rate. The carrying value of the asset is depreciated on a straight-line basis over the remaining estimated life of the REF Facility asset group. The ARO liability is increased over time to reflect the change in its present value, and the capitalized cost is depreciated over the useful life of the site license. In subsequent periods, the Company is required to make adjustments to AROs based on changes in the estimated fair values of the obligations. Corresponding increases in asset book values are depreciated over the remaining useful life of the related site license. Uncertainties as to the probability, timing, or amount of cash flows associated with AROs may affect management’s estimates of fair value. For the years ended December 31, 2017, 20162020 and 2015,2019, within operating expenses, the Company recorded $139, $122,$184 and $94,$134 of accretion expense, respectively.


118

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 20152020 and 2019
(in thousands)

The following table describes changes to the Company’s ARO liability for the years ended December 31, 20172020 and 2016:2019:
20202019
Beginning balance$1,449 $1,304 
Liabilities incurred, net631370
Removal of liability(194)(129)
Accretion184134
Settlement of obligations(230)
Ending balance$2,070 $1,449 
  2017 2016
Beginning balance $1,474
 $1,079
Liabilities incurred (removed) (199)
 381
Accretion 139
 122
Settlement of obligations (348)
 (108)
Ending balance $1,066
 $1,474

Furniture, Fixtures and Equipment

Furniture, fixtures, and equipment is comprised of office furniture and fixtures and office equipment, including those under capital lease. These assets are recorded at cost and depreciated using the straight-line method with estimated useful lives ranging from 3 to 14 years.

The following table summarizes the components of gross and net carrying amounts for fixed assets as of December 31, 2017 and 2016:
  2017 2016
REF Facilities and related equipment $88,527
 $87,031
Furniture, fixtures and equipment 898
 1,019
Other 348
 477
  89,773
 88,527
Accumulated depreciation (24,545)
 (20,058)
Fixed assets, net $65,228
 $68,469

NOTE 3 - INVENTORY

Inventory is comprised primarily of feedstock coalfuel and chemicals used in the production and sale of reduced emissions fuelREF at REF Facilities owned and operated by the Company. Inventory is valued at average cost.Facilities. The Company assesses the inventory valuation on a monthly basis and reduces the value for any obsolete inventory. No valuation allowance was considered necessary as of December 31, 20172020 and 2016.2019.
20202019
Feedstock fuel$12,707 $11,187 
Chemicals1,023679
Total inventory$13,730 $11,866 
 2017 2016
Feedstock coal$10,750
 $9,723
Chemicals320
 134
Total$11,070
 $9,857

NOTE 4 - REF FACILITY ACTIVITIESREVENUES

As discussed in Note 1, revenue is recognized when a performance obligation is satisfied. The Company has entered into several types of transaction structures with TP Investors. Each of the agreements contains terms such that the payments received are recognized by the Company as Lease revenues as they are earned. Payments under the agreements may includeCompany’s contracts can contain both fixed and contingentvariable components of the transaction price. Each contract is evaluated for these components and may represent rents, member interest purchasebe determined to include fixed consideration, variable consideration and financing components as part of the overall transaction price. The Company receives payments or asset purchasefrom customers based upon specific payment schedules established under each contract. Payment schedules can include a combination of prepayments, fixed payments depending onand variable payments, based upon expected production volumes, and are generally made quarterly.

When a contract is determined to contain variable consideration, the particular transaction structure.price is estimated using the expected value (i.e., the most likely amount method) to predict revenue for that contract. These variable amounts are estimated at contract inception based upon the projected REF production volumes associated with the specific Generator location. Estimated amounts are included in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Estimates of variable consideration are estimated based upon contractual terms, historical experience and projected REF production volumes.


ElevenNine and teneight, respectively, of the REF Facility transactions with TP Investors are transactions with a related party as of December 31, 20172020 and 2016, respectively.2019. These transactions generally have terms that extend to the date ten years after the placed in-servicein service date for the particular REF Facility, subject to earlier termination by the TP Investor at periodic intervals or upon the occurrence of specified events. Six

Under the various TP Investor agreements, Tinuum has committed to provide the REF Facility and three operating REF Facilities placed withthe related sublicense for a term as identified in each contract. Most of the agreements expire in 2021 or by the first quarter of 2022. Generally, payments are made quarterly to Tinuum on a net 10 to 30 days basis, in advance of the respective quarter.

The following is an estimate of the cash flows expected to be received from TP Investors operate under partnership or asset sale transaction structures as ofthrough December 31, 2017 and 2016, respectively.

Under certain2021, assuming no variations in estimated production volumes, no modifications of payments, non-renewals or early terminations of contracts. It is possible that future payments from TP Investors may be modified or reduced. Future REF Facility transactions, an initial deposit or prepayment may be received. Any prepayments receivedpayments, including any eliminated in consolidation, are recordedbased on the estimated levels of REF production.
119

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 20152020 and 2019
(in thousands)

2021$154,805 
20227,515 
$162,320 

In December 2019, the Company agreed to provide a future price concession to a significant customer. A portion of the price concession is provided via a note payable (“Customer Note”) under which the Company would make monthly principal and interest payments to the customer commencing in January 2020 and continuing through March 2021. The Customer Note was $27,000 and the Company recorded the amount as deferred revenuecontract costs on the consolidated balance sheet and allocated the payments to the customer as a reduction to the transaction price of the existing contracts with the customer. The reduction in the transaction price is being recorded monthly, commencing with the contract date of December 2019 through the end of the term of the payments of March 31, 2021. The reduction in the transaction price is recorded as production volumes are achieved (over time). For the years ended December 31, 2020 and 2019, the Company reduced revenues under this price concession contract by $20,903 and $871, respectively.

In certain instances, the Company employs outside parties to facilitate the commencement of a Lease, MIPA or APA transaction. Under these agreements, the Company typically pays the outside party a fee (“Fee”) relative to either the collection of revenues by the Company or the REF production volumes achieved. Under the Lease and MIPA transactions, any related contract costs are recorded as the production volumes or collection of revenues are achieved. These amounts are recorded as a component of cost of goods sold. Under the APA agreements, the Fees are capitalized as contract costs based on the estimated revenues recognized at the commencement of the contract and are amortized intoas a reduction of revenue under the straight-line method over the amortization period defined inof benefit. For the respective agreement. As ofyears ended December 31, 20172020 and 2016, the Company has recorded $35,006 and $33,407, respectively, of deferred revenue related to prepayments.

An REF Facility Asset Purchase Agreement was entered into with a specific TP Investor (“Purchaser”) in February 2013. Under this agreement, Tinuum received prepayments from the Purchaser which were amortized and recognized as revenue over a 36-month term. As part of the agreements a Put-Call Agreement was entered into, which granted the Purchaser the option to put the REF Facility back to Tinuum under certain circumstances. In October 2015, Tinuum was notified of the Purchaser’s intent to put the REF Facility back to Tinuum, effective in April 2016. As a result of the put, no additional gain or loss was recognized and all previously recognized revenues were not impacted.

In February 2014, the Company sold 99.8% of the member interests of one of its subsidiaries, RCM6, LLC (“RCM6��). RCM6 owns a single REF Facility. A portion (49.9%) of the member interests was purchased by parties related to or controlled by ADA, NexGen, and Republic Financial Corporation (“Republic”). The remaining 49.9% was sold to a TP Investor. Effective March 3, 2016, the TP Investor purchased the interests held by ADA and NexGen (including interests previously acquired by NexGen from Republic) resulting in the TP Investor owning 99.8% of member interests in RCM6. The Company retains its 0.2% member interest.

Under the RCM6 Member Interest Purchase Agreements (“RCM6 MIPA”), the Company received prepayments at closing which were to be amortized through the first quarter of 2017. As part of the 2016 purchase of member interests between the owners, the amortization period was extended through the fourth quarter of 2017. The RCM6 MIPA calls for additional installment payments to be made quarterly by the owners of the member interests of RCM6 through 2021. These payments are recorded as Lease revenues in the Company’s consolidated financial statements.

Simultaneously with the sale by the Company of the member interests, RCM6 entered into agreements for the purchase of feedstock coal, the sale of reduced emissions fuel, the provision of coal yard services and a site license (the “RCM6 Agreements”) with a Generator. The RCM6 Agreements are required for the ongoing production and sale of reduced emissions fuel by RCM6 at its current location. Simultaneously with the execution of the RCM6 Agreements, the Company also entered into a guarantee agreement whereby the Company guaranteed, on behalf of RCM6, up to $15.0 million of its obligations under the RCM6 Agreements (“RCM6 Guarantee Agreement”), including payment obligations and obligations to indemnify the Generator. The RCM6 Guarantee Agreement expires six years after the expiration of the RCM6 Agreements. No liabilities have been recorded related to the RCM6 Guarantee Agreement by the Company as of December 31, 2017 and 2016.

During 2016 the Company created two additional limited liability companies, Green River RC218, LLC and Red River RC220, LLC, (together “River LLCs”) in which the Company owns a 1% member interest and an unrelated TP Investor owns the remaining 99%. The River LLCs lease REF Facilities from the Company, which REF Facilities are utilized in the production and sale of reduced emissions fuel. The agreements for the River LLCs call for payments to be made quarterly through 2021, subject to deferral in certain circumstances, by the owners of the member interests of the River LLCs. The River LLCs entered into agreements for the purchase of feedstock coal, the sale of reduced emissions fuel, the provision of coal yard services and site licenses (the “River Agreements”) with two different Generators, one for each of the River Facilities. These River Agreements are required for the ongoing production and sale of reduced emissions fuel by the River LLCs. In connection with these River Agreements, the Company also entered into guarantee agreements whereby the Company guaranteed, on behalf of the River LLCs, each of their obligations under the River Agreements, including payment obligations and obligations to indemnify the Generator (“River Guarantee Agreements”). No liabilities have been recorded related to the River Guarantee Agreements by the Company as of December 31, 2017 and 2016.

In July 2017, the Company sold 50.1% of the member interests of one of its subsidiaries, GWN-REF, LLC (“GWN-REF”). GWN-REF owns a single REF Facility. A portion (.2%) of the member interests was purchased by GWN Manager, LLC which is owned by parties related to or controlled by ADA and NexGen. Tinuum has been appointed as the Manager of GWN Manager, LLC. Another 49.9% of the member interest of GWN-REF were purchased by a TP Investor. The remaining 49.9% member interest in GWN-REF was retained by Tinuum and is2019, Fees included in Tinuum’s consolidated financial statements as Tinuum remains the primary beneficiary of GWN-REF.

Under the GWN-REF Member Interest Purchase Agreements (“GWN-REF MIPA”), the Company received a prepayment which is to be amortized through July of 2018. The agreement calls for additional installment payments through 2021 to be made quarterly by the TP Investor which owns 49.9% of the member interests of GWN-REF. These payments are recorded as Lease revenues in the Company’s consolidated financial statements.
TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 2015
(in thousands)


Simultaneously with the sale by the Company of the member interests, GWN-REF entered into agreements for the purchase of feedstock coal, the sale of reduced emissions fuel, the provision of coal yard services and a site license (the “GWN-REF Agreements”) with a Generator. The GWN-REF Agreements are required for the ongoing production and sale of reduced emissions fuel by GWN-REF at its current location. Simultaneously with the execution of the GWN-REF Agreements the Company entered into a guarantee agreement whereby the Company guaranteed, on behalf of GWN-REF, payment for any amounts due under the GWN-REF Agreements (“GWN-REF Guarantee Agreement”), including obligations to indemnify the Generator. The GWN-REF Guarantee Agreement expires after final payments are made after the termination of the GWN-REF Agreements. No liabilities have been recorded related to the GWN-REF Guarantee Agreement by the Company as of December 31, 2017. TS does not operate and maintain the REF Facility on behalf of GWN-REF. Instead the REF Facility is operated and maintained by an affiliate of the TP Investor.

In November 2017, the Company sold two REF Facilities to a TP Investor in exchange for $19,161 of cash, net of closingcontract costs and installment payments to be recognized over time. Under the Asset Purchase Agreements for these two REF Facilities, both fixed and contingent payments are required to be made quarterly. Contingent payments are based upon production volumes achieved by the specific REF Facilities. The Company recorded the down payment as deferred revenue that is being amortized over the term specified in the Asset Purchase Agreement. Due to the Company’s continuing involvement with the REF Facilities, the gain on sale is being recognized as Lease revenues over the installment payment period. Any contingent payments received under the Asset Purchase Agreements will be recorded as production is achieved and will be recorded as contingent lease revenues within the Company’s consolidated Statements of Operations.

The following is a schedule of periodically renewable fixed payments to be paid by TP Investors to the Company through December 31, 2021, assuming no postponement of scheduled payments, no modifications of payments, non-renewals or early terminations. Certain TP Investor agreements include provisions for modification of future payments. Accordingly, it is possible that future payments from TP Investors may be modified or reduced. Only known payment changes have been included below. Future REF Facility payments, including any eliminated in consolidation, do not include contingent amounts which are based on the levels of reduced emissions fuel production:consolidated balance sheet were $315 and $600, respectively.
2018$147,148
2019168,375
2020158,746
2021109,834
Thereafter1,849
 $585,952

NOTE 5 - VARIABLE INTEREST ENTITIES

RCM6,For the River LLCsyears ended December 31, 2020 and GWN-REF (together2019, the “TG VIEs”Company consolidates nine and seven entities, respectively, (the "TG VIEs") that were created as reduced emissions fuelREF production companies. The operations include the purchase of feedstock coalfuel from a Generator, application of chemicals utilizing that entity’sProducer Entity’s REF Facility, and the subsequent sale of reduced emissions fuelREF to the Generator.

In all nine of the TG VIEs, CCS-AE, LLC ("CCS-AE"), a subsidiary of the Company, or another Tinuum entity is the Managing Member and holds a 0.2% or 1.0% member interest, depending on the transaction. As the Managing Member of the TG VIEs, CCS-AE or Tinuum directs the activities that are considered most significant to the entities. Based upon the criteria set forth in ASC 810, the Company has determined that it is the primary beneficiary in the TG VIEs for the years ended December 31, 2017, 2016,2020 and 2015. The Company, through its 100% owned subsidiaries (“Managers”), holds a 0.2%, 1.0% or 49.9% member interest, respectively in the TG VIEs, is the manager of the TG VIEs, and directs the activities that are considered most significant to the entities.2019. As such, the financial results of the TG VIEs are consolidated with the results of the Company, and the results attributable to the other owners are presented as “Noncontrolling Interests”noncontrolling interests within the consolidated financial statements.


Creditors of the TG VIEs have no recourse against the general credit of the Company (outside of its member interest or specific guarantee obligations), and the assets of the Company are not collateral for any TG VIE obligations. The operations of all fournine entities are financed through capital calls of the respective members in proportion to their member interests. In the event that a member defaults on a capital call request made by the Manager,Managing Member, the ManagerManaging Member may (i) withhold distributions payable to the defaulting member or sue for the amount due, and/or (ii) elect to transfer the defaulting member’s interest to a separate legal entity controlled by the ManagerManaging Member, or (iii) suspend operations of the REF Facility. In certain instances, the TP Investor has the ability to put, and Tinuum has the ability to call, the other membershipmember interests at a purchase price equal to fair market value.
TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 2015
(in thousands)



Under the provisions of certain of the TG VIE’sVIEs’ various agreements, including the leases of REF Facilities or the partnership operations of the TG VIEs, the agreements terminate sometime during time periods ranging from the fourth quarter of 2021 through December 31, 2022, unless terminated earlier by unanimous written consent of the members.


Under certain of the various RCM6 Agreements, certainTG VIE agreements, capital call limitations exist, limiting the amount of capital calls available if certain operational costs are exceeded.

120

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2020 and 2019
(in thousands)
NOTE 6 - NOTES PAYABLE

Line of Credit -


In June 2015,September 2019, the 2013 Revolver ("Revolver") with Colorado Business Bank (“CBB”BOK Financial ("BOK"), was amended and replaced with an Amended and Restated Revolving Credit and Security Agreement (“Amended Revolver”). The Amended Revolver increased the size of the facility to $20.0 million. The interest rate was modified to be the greater of 5.5% per annum or the prime rate (as defined in the agreement) plus 1.0%. The maturity date was modified to be June 2016, which was later extended to September 30, 2016.

On September 26, 2016, the Company and CBB entered into the Second Amendment to Amended and Restated Revolving Credit and Security Agreement and Waiver of Default (“Second Amendment”) which extended the maturity date to September 30, 2017 and waived the default arising from the Company’s failure to provide CBB sufficient notice of the change in its corporate name. The Second Amendment changed the line of credit maximum principal amount to $17.0 million less any undrawn face amount of letters of credit. Any undrawn balance was subject to a quarterly unused facility fee in the amount of 0.9% annually. Interest on outstanding balances was paid monthly at the rate of 5.5% per annum.

On September 25, 2017 the Company and CBB entered into the ThirdFifth Amendment to the Amended Revolver extending the maturity date to December 29, 2017. In December 2017, the Company and CBB entered into the Fourth("Fifth Amendment"). The Fifth Amendment to the Amended Revolver. Under the Fourth Amendment the maturity date was extended untilexpired on December 31, 2020 and was not renewed. Under the maximumFifth Amendment, prior to expiration, the available borrowing limits were modified as follows:
limit was:
DateAvailable Borrowing Limit
For the period ending December 30, 2019$ 17,000
For the period commencing December 31, 2019 through March 30, 2020$ 13,600
For the period commencing March 31, 2020 through June 29, 2020$ 10,200
For the period commencing June 30, 2020 through September 29, 2020$ 6,8007,000 
For the period commencing September 30, 2020 through December 30, 2020$3,400
For the period after December 31, 2020$ 0— 

The FourthFifth Amendment requiresrequired any outstanding borrowings annually to be fully repaid for a period of fifteen consecutive days during two non-consecutive calendar quarters.

Amounts outstanding under the FourthFifth Amendment may bewere repaid at the option of the Company. Any undrawn balance isduring the years ended December 31, 2020 and 2019, was subject to a quarterly unused facility fee in the amount of 0.826% annually. Interest on outstanding balances iswas payable monthly and iswas accrued at the greater of 5.5% per annum or the prime rate (as defined in the agreement) plus 1.0%.

The FourthFifth Amendment iswas collateralized by the assets of the Company and the equity interests and proceeds related to such equity interests of each material subsidiary owned by the Company. The FourthFifth Amendment iswas also collateralized by the Company’s deposit accounts held at CBB.BOK. These accounts arewere not restricted by the FourthFifth Amendment.

Tinuum iswas required to be in compliance with certain loan covenants under the Company’s debt agreements,Fifth Amendment, including tangible net worth as defined in the agreement. As of December 31, 2017 and 2016,2019, the Company was in compliance with the respective loan covenants. As of December 31, 2019, the outstanding balance on the Revolver was $5,500.

Customer Note
As mentioned in Note 4, in December 2019, the Company agreed to provide a future price concession to a significant customer via a Customer Note. The Company makes monthly principal and interest payments to the customer. Payments commenced in January 2020 and extend through March 2021. As of December 31, 2020 and 2019, respectively, the Customer Note balance was $5,400 and $27,000. The Customer Note bears interest at 8% per annum.
Under the Customer Note, Tinuum has agreed to maintain a Cash Reserve Account of $3,000, to limit additional indebtedness to $7,000 (plus amounts to finance Company insurance premiums plus a maximum of $500 for finance leases) and to maintain compliance with certain loan covenants. At December 31, 2020 and 2019, respectively, the Company was in compliance with the Customer Note covenants.
Secured promissory note -Promissory Note

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2017, 2016 AND 2015
(in thousands)

OnIn February 10, 2014, RCM6, a VIE consolidated into the consolidated financial statements of the Company, entered into an $11.0 million$11,000 secured promissory note (the “Note”"Note") with a Generator from which it purchases feedstock coal,fuel, and to which it sells reduced emissions fuel and unrefined coalfuel on a monthly basis. The purpose of the Note is to finance the purchases of feedstock coalfuel from the Generator. The amount of principal and interest owed is dependent upon the amount of feedstock coalfuel purchased and reduced emissions fuel and unrefined coalfuel sold between the two parties and is net settled on a monthly basis. The Note is collateralized by RCM6’sthe feedstock coalfuel inventory.

The Note bears interest at a per annum rate equal to the short-term applicable federal rate announced by the IRS in December of each year. The interest rate for the years ended December 31, 2017, 20162020 and 20152019 was 0.96%, 0.56%1.60% and 0.34%2.72% per annum, respectively. Interest is payable quarterly in arrears.

All outstanding amounts owed under the Note are due and payable on the earlier of December 31, 2021 or the termination or expiration of the Feedstock Coal Purchase Agreement between RCM6the TG VIE and the Generator.

As of December 31, 20172020 and 2016,2019, respectively, the outstanding balance on the Note was $7,284$4,327 and $6,794$4,505 with interest payable of $17$16 and $12.$32, respectively.

121

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2020 and 2019
(in thousands)
In June 2018, a second VIE consolidated into the consolidated financial statements of the Company, entered into an $1,986 secured promissory note ("2018 Note") with a Generator to fund the initial purchase of feedstock fuel. The 2018 Note bears interest at a per annum rate equal to the mid-term applicable federal rate announced by the IRS in December of each year. The rate was 1.67% and 3.03% for the years ended December 31, 2020 and 2019, respectively. Interest is payable quarterly in arrears. The 2018 Note is collateralized by the feedstock fuel inventory.
All outstanding amounts owed under the 2018 Note are due and payable on the earlier of December 31, 2025, or the termination or expiration of the Feedstock Coal Purchase Agreement between the Company and the Generator.
At each of December 31, 2020 and 2019, the outstanding balance on the Note was $1,986. Interest payable of $3 and $5 was recorded as of December 31, 2020 and 2019, respectively.
NOTE 7 - MEMBERS’ EQUITY

Under the Class B Unit Purchase Agreement (“("Class B Agreement”Agreement") with GSFS, which was entered into upon the amendment and restatement of the Tinuum Operating Agreement in 2011, ADA and NexGen each entered into a limited guarantee agreement under which the parties are obligated to guarantee performance by Tinuum of its obligations to indemnify GSFS against certain losses it may suffer as a result of inaccuracies or breach in representations and covenants related to the Class B Agreement or REF Facilities’ lease agreements with GSFS affiliates. ADA and NexGen entered into a contribution agreement where, in the event of such a breach, they have agreed to contribute their pro rata share of any amounts under the limited guarantee.

The Class B units arewere considered conditionally redeemable. Asredeemable as specified in the Second Amended and Restated Operating Agreement and the Class B Agreement, on or afterAgreement. Upon satisfaction of the earlier of (i) a breach of any material provision ofredemption criteria in 2018, GSFS continues to own the Class B Agreement or Tinuum’s organizational documents that is not cured and that results in damages to GSFS of at least $10.0 million and (ii) the 10 year anniversary of the date the last REF Facility owned by Tinuum was placed in service but in no event later than December 31, 2021, and if GSFS’ unrecovered investment balance in its Class B units has not been reduced to zero, GSFS may require its Class B units to be redeemed for an amount equal to its unrecovered investment balance. No triggering redemption events have occurred as of December 31, 2017 and 2016, respectively. GSFS’ Class B units include a guaranteed 15% annual return calculated monthly based upon the outstanding balance as of that date. The outstanding balance over time is based on the original investment, increased by the guaranteed return, and reduced by any distributions of cash or PTCs. In February 2018, the unrecovered investment balance associated with the Class B Units was repaid in full.

The U.S. Securities and Exchange Commission (the “SEC”) requires conditionally redeemable equity to be classified outside of permanent equity. Because the financial statements of the Company are expected to be furnished to the SEC as part of a filing by one of the Company’s Members, the conditionally redeemable amount has been classified out of permanent equity and into temporary equity in these consolidated financial statements. Additionally, the income and member equity attributable to the Class B Member has been classified and is separately presented in the consolidated financial statements.

Additionally, GSFS has certain preferences over Class A Members as to liquidation proceeds and profit distribution. Class B unitswhich have no further capital call requirements and have limited voting rights.

In September 2019, the Second Amended and Restated Operating Agreement was amended to eliminate the preferential redemption provisions for the Class B shares and simultaneously reallocated certain tax attributes between the Class A and B Members.
The Company had the following classes and percentages of Member units issued and outstanding at December 31, 20172020 and 2016:
2019.
Class A Units (voting)8585 %
Class B Units (non-voting)1515 %

NOTE 8 - INCOME TAXES

The Company has adopted Accounting Standards Update No. 2015-17 - Income Taxes, retrospectively, commencing with the year ended December 31, 2016. As such, we have reclassified the deferred tax asset and liability balances to be presented as a net long-

term asset in the Company’s Balance Sheets as of December 31, 2017 and 2016, respectively. There were no effects on operations forDuring the years ended December 31, 2017, 2016,2020 and 2015 as a result of this reclassification.

For2019, the years ended December 31, 2017, 2016, and 2015, state incomeCompany has concluded that there are no significant uncertain tax expense (benefit) consisted ofpositions that would require recognition or disclosure in the following:
 2017 2016 2015
Current$429
 $3,396
 $881
Deferred965
 (971)
 339
Total state income tax expense$1,394
 $2,425
 $1,220

The following represents the approximate tax effect of each significant type of temporary difference and classification of net deferred income taxes asfinancial statements. As of December 31, 20172020, and 2016:
 2017 2016
Deferred tax assets$275
 $1,189
Deferred tax liabilities(51) 
Net deferred tax asset$224
 $1,189

2019, the Company made no provision for interest or penalties related to uncertain positions.
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of non-current assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Long termpurposes related to one of the Company’s consolidated VIEs. Under a tax sharing agreement with the specific TP Investor of this VIE, the deferred tax assets are comprisedallocated specifically to the TP Investor and are not for the benefit of deferred revenueTinuum or its members. On a quarterly basis, the TP Investor provides a cash payment to the VIE for the prior quarter’s tax benefits generated, generally production tax credits and net operating losses. As a result, the quarterly estimated funding is presented as an income tax receivable in the consolidated balance sheets. The income tax receivable as of December 31, 2020 and 2019, consists of:
20202019
Net operating losses$1,026 $287 
Deferred tax liability(21)— 
Production tax credits4,961 617 
Total deferred tax assets$5,966 $904 
Net operating loss carryforwards can be carried forward indefinitely and the deferred tax liabilities are associated with depreciationPTCs can be carried forward for 20 years.
122

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2020 and 2019
(in thousands)
For the years endingended December 31, 20172020 and 2016. No valuation allowance was established as it is more likely than not that2019, income tax expense (benefit) consisted of the deferred tax asset will be realized. Additionally, no liability related to uncertain tax positions was recorded at December 31, 2017 and 2016.following:

20202019
Current$1,137 $1,369 
Deferred(18,979)(904)
Total income tax (benefit) expense$(17,842)$465 
NOTE 9 - RELATED PARTY TRANSACTIONS

During 2017, 2016,2020 and 2015,2019, the Company incurred expenses and capital expenditures and had amounts payable (excluding capital distributions) to and revenues recognized from the following related party entities:
 ADATSGSFS affiliatesNexGen and affiliates
 (a)(b)(c)(d)
Payable at December 31, 2017$3,249
$4,204
$
$45
Payable at December 31, 20161,930
3,766
3
35
     
Receivable at December 31, 2017$
$934
$20
$15
Receivable at December 31, 2016



     
Revenues recognized during the year ended    
December 31, 2017$
$3,489
$117,376
$
December 31, 2016

112,310

December 31, 20153,271

132,510
3,271
     
Expenses incurred during the year ended    
December 31, 2017$9,677
$9,856
$2
$767
December 31, 20166,124
8,288
14
1,039
December 31, 201510,643
12,643
31
564


ADATSGSFS AffiliatesNexGen and Affiliates
(a)(b)(c)(d)
As of December 31, 2020
Accounts payable$3,454 $4,179 $— $20 
As of December 31, 2019
Accounts payable$4,104 $6,134 $20 $20 
Revenues Recognized During the Year Ended
December 31, 2020$— $(593)$88,243 $— 
December 31, 2019— 45,608 121,794 — 
Expenses Incurred During the Year Ended
December 31, 2020$13,656 $16,629 $— $527 
December 31, 201916,945 14,807 — 519 
(a)
ADA expenses include expenditures for royalties. Revenues relate to REF Facility lease revenues recognized.royalties and consulting services.
(b)
TS expenses include operating expenses associated with the operations of retained REF Facilities. TS revenues include APA point in time revenue estimates and management fee revenues from TP Investors included within the TS consolidated financial statements.
(c)
GSFS affiliates expenses include chemical expenses at certain REF Facilities. Revenuesrevenues relate to REF Facility lease revenues recognized.
(d)
NexGen and affiliates expenses costs include management fees and labor costs.

The Company acquires substantial amounts of fixed assets from TS. For the years ended December 31, 20172020 and 2016,2019, the Company acquired $4,692$5,549 and $2,846,$17,951, respectively, of capital assets from its related party, TS.

NOTE 10 - COMMITMENTS

Purchase Commitments -

OnIn November 3, 2011, Tinuum entered into a technology licensing agreement with ADA whereby Tinuum agreed to pay ADA royalties based on a percentage of operating income from reduced emissions fuelREF production at REF Facilities that utilize the M-45™ technology. The licensing agreement required a prepayment of $10.0 million upon the achievement of certain milestones. As of December 31, 2012, all the milestones had been substantially achieved. Tinuum paid $2.0 million to ADA in 2011, and the remaining $8.0 million plus accrued interest of $189 in March 2013. These prepaid royalties were applied to royalties due to ADA, in lieu of cash payment, in the proportion of 66.67% cash payment and 33.33% to the reduction of the prepaid royalty balance. During 2016 the remaining prepaid balance of $1,442 was returned to the Company by ADA, reducing the prepaid balance to zero. Royalties due in 2017 were accrued for and paid in cash. During the years ended December 31, 2017, 20162020 and 2015,2019, respectively, the Company recognized royalty expense under Costcost of Salessales in the amounts of $9,677, $3,052,$13,440 and $3,539,$16,900, respectively.

In December 2015 the Company was assigned, by TS, a Master Supply Agreement with a chemical vendor. Under the agreement the Company hashad a commitment commencing January 1, 2015, for minimum purchase quantities of the specified chemical that if not achieved would require a shortfall payment amount (“Shortfall”("Shortfall") to be paid to the vendor on a monthly
123

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2020 and 2019
(in thousands)
basis. Any Shortfall payment required would be applied to future chemical purchases once certain minimum volume levels arewere achieved. Each renewal term prior to January 1, 2017 also requires minimum purchase volumes and Shortfall payments that decline over time. In the years ending December 31, 2016 and 2015, respectively, the Company paid $2,273 and $13,675 under the Master Supply Agreement and recorded these amounts as long-term Other assets on the Consolidated Balance Sheets. During 2016 the Master Supply Agreement was amended and the required Shortfall payments were suspended. Additionally, the Company was able to utilize some of the chemicals and therefore reduce the prepaid balance by $4,339 and $2,040 for the years ended December 31, 2017 and 2016, respectively. In 2018 an agreement was reached to further amend the Master Supply Agreement to eliminate the Shortfall payment requirement to be made for any additional product purchases and to also defer the repayment provisions back to Tinuum. In exchange the vendor will retain a minimum quantity of chemical inventory on hand and the Company will leavemade an additional prepayment of $8,187 resulting in a minimum deposittotal prepaid amount of $9.6 million$17,755 on deposit with the vendor until such time as of December 31, 2019. Beginning in August 2020, the minimum guaranteeCompany started utilizing the prepaid deposit balance through ongoing chemical usage. As of chemicalsDecember 31, 2020, the balance was $10,632, and is reducedincluded within other current assets in the Company’s consolidated balance sheets. The Company anticipates utilizing the prepaid deposit balance by the Company.end of 2021.

Retention Compensation
It has been an ongoing practice of the Company to provide severance payments to employees that are involuntarily terminated for reasons other than for cause. In anticipation of the wind down of operations expected by 2022, the Company has formalized that practice into a retention compensation program. The purpose of the program is to incent employees to remain with the Company through the wind down dates necessary for the successful cessation of the Company. Certain executive employees have contracts that do not have a defined retention date but provide for severance payment provisions equivalent to one year of base salary that only become due and payable upon a decision by the Board of Managers to terminate an executive other than for cause. The potential estimated liability under these contracts is approximately $1,000. Any executive employee who does not have an employment contract and all non-executive employees have a retention bonus agreement with a defined dollar amount that is payable by the Company upon the earlier of the Company's initiation of an involuntary termination or the employee remaining with the Company until the defined retention date within their agreement. Any employees electing to voluntarily terminate employment with the Company prior to their defined retention date will forfeit their retention bonus amount. The Company has determined these retention program costs to be reasonably estimable and probable for the year ended December 31, 2020. As a result, the Company has recognized a retention compensation liability and compensation expense of $3,116 as of and for the year ended December 31, 2020. No amount was recognized as of December 31, 2019.
401k Profit Sharing Plan and Other Benefits -

The Company offers a defined contribution and profit sharing plan (the “Plan”"Plan") to employees who are over 18 years of age and have been employed by the Company for more than 30 days. Employees can deposit up to 80% of their eligible pay up to the statutory limit in the Plan. The Company contributes 3.0%3% of employees’ eligible pay to the Plan as safe harbor contributions. Commencing January 1, 2018, the Company began providingcontributions and an additional matching contribution to employees equivalent to 50% of the first 6% of employee contributions. Company contributions charged to benefits expense were $90, $99,was $194 and $90$186 for the years ended December 31, 2017, 20162020 and 2015,2019, respectively.

Office Lease -

InTinuum’s ROU asset and lease liability are comprised of its lease for its corporate office space. The lease has an eight-year term that commenced in March 2014,2014. The lease does not include renewal options that the Company entered into an eight yearexpects to utilize. The Company has utilized its implicit borrowing rate of 5.75% to calculate the ROU asset and lease agreementliabilities. Operating lease expense for office space. Rent expense under the lease foreach of the years ended December 31, 2017, 2016,2020 and 20152019 was $192, $189,$199 and $203,$201 respectively. Operating leases are included in the ROU assets within fixed assets, net, and lease liabilities are included within accrued liabilities on the consolidated balance sheets. Real estate taxes and common area maintenance charges are expensed as incurred as operating expenses and are not included in the lease payments.

Future minimumAs of December 31, 2020, future annual lease payments under lease agreements through December 31, 2022 are as follows:

2021$229 
2022236
Total lease payments465
Less: interest expense(27)
Present value of lease liabilities$438 
2018$199
2019207
2020214
2021221
Thereafter229
Total$1,070

NOTE 11 - CONCENTRATIONS

The COVID-19 pandemic developed rapidly in 2020. Measures taken by federal and local governments to contain the virus have affected economic activity, locally as well as nationally. The Company's production of REF has to date been considered an element of power generation and therefore been considered an essential function under various government policies restricting business activity. The Company has taken a number of steps to monitor and mitigate the effects of COVID-19 on its operations
124

TINUUM GROUP, LLC AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 2020 and 2019
(in thousands)
and customers, such as safety and health measures for its employees. At this stage, the impact on the financial and operational results has not been significant and based on the Company’s experience to date this is expected to remain the case. The Company will continue to follow the applicable government policies and advice and, in parallel, the Company will continue to pursue operational modifications to allow continued REF production without jeopardizing the health of the Company’s employees or those of its customers.
The Company’s operations are currently dependent upon a limited number of TP Investors leasing or purchasing REF Facilities. Further, under the terms of the various TP Investor agreements, the agreements may be subject to termination or modification by the TP Investor at periodic intervals or upon the occurrence of specified events which include amendments to Section 45 of the Internal Revenue Code. The impact of Tax Reform is still being assessed by both the TP Investors and management of the Company. The termination or modification of all or a material portion of any TP Investor agreements would have a significant adverse impact on the Company’s future operations and financial condition.

Additionally, the production and sale of reduced emissions fuelREF is dependent upon the plant operations of specific generating stations.stations where the REF Facilities are located. Production at these locations could be impacted by the COVID-19 pandemic, the demand for electricity, the amount of coalfuel burned as compared to other electricity generation fuel sources utilized by the utility to produce electricity, disruptions due to foreseen or unforeseen plant outages, andor changes in government regulations related to electricity generation or coal burning activities.

Certain of the chemicals utilized by the Company to produce reduced emissions fuelREF are available from a limited number of vendors in the United States. The Company's future operations may be materially and adversely affected if the Company encounters difficulty procuring these chemicals, the quality of available chemicals deteriorates or there are significant price increases for the chemicals.

NOTE 12 - SUBSEQUENT EVENTS

Management evaluated subsequent events through March 2, 20188, 2021, the date the financial statements were available to be issued.

125


Item 16. Form 10-K Summary
None.


SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Exchange Act, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
 
Advanced Emissions Solutions, Inc.
(Registrant)
By/s/ L. Heath SampsonBy/s/ Greg P. MarkenBy/s/ Christine A. Bellino
L. Heath SampsonGreg P. MarkenChristine A. Bellino
Interim Chief Executive Officer (Principal Executive Officer)Chief FinancialAccounting Officer (Principal Financial and Accounting Officer)
Date: March 12, 201810, 2021Date: March 12, 201810, 2021
Pursuant to the requirements of the Exchange Act, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.
 
By/s/ Carol EicherBy/s/ Brian Leen
Carol Eicher, DirectorBrian Leen, Director
Date: March 10, 2021Date: March 10, 2021
By/s/ Gilbert LiBy/s/ R. Carter Pate
Gilbert Li, DirectorR. Carter Pate, Director
Date: March 10, 2021Date: March 10, 2021
By/s/ J. Taylor SimontonBy/s/ L. Spencer Wells
J. Taylor Simonton, DirectorL. Spencer Wells, Director
Date: March 10, 2021Date: March 10, 2021
By/s/ A. Bradley GabbardBy/s/ Derek C. Johnson
A. Bradley Gabbard, DirectorDerek C. Johnson, Director
Date: March 12, 2018Date: March 12, 2018
By/s/ Gilbert LiBy/s/ R. Carter Pate
Gilbert Li, DirectorR. Carter Pate, Director
Date: March 12, 2018Date: March 12, 2018
By/s/ L. Heath SampsonBy/s/ J. Taylor Simonton
L. Heath Sampson, Director and Chief Executive OfficerJ. Taylor Simonton, Director
Date: March 12, 2018Date: March 12, 2018
By/s/ L. Spencer Wells
L. Spencer Wells, Director
Date: March 12, 2018

131126