American DG Energy (ADGE) 10-Q 13 May 16 2016 Q1 Quarterly report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - shares	3 Months Ended
	Mar. 31, 2016	May. 12, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	AMERICAN DG ENERGY INC
Entity Central Index Key	1,378,706
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	adge
Entity Common Stock, Shares Outstanding		50,684,095
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2,016

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 4,002,799	$ 5,587,528
Accounts receivable, net	1,239,758	937,706
Unbilled revenue	27,697	12,468
Due from related party	100,652	99,548
Inventory	1,068,021	1,112,853
Prepaid and other current assets	468,669	752,397
Total current assets	6,907,596	8,502,500
Property and equipment, net	25,643,794	25,467,049
Other assets, long-term	42,688	52,829
TOTAL ASSETS	32,594,078	34,022,378
Current liabilities:
Accounts payable	629,473	575,248
Accrued expenses and other current liabilities	587,305	544,624
Due to related party	611,526	1,171,863
Total current liabilities	1,828,304	2,291,735
Long-term liabilities:
Convertible debentures	1,570,219	1,585,264
Convertible debentures due related parties	17,336,411	17,030,070
Note payable - related party	2,000,000	2,000,000
Total liabilities	$ 22,734,934	$ 22,907,069
Commitments and contingencies
Stockholders' Equity:
Common stock, $0.001 par value; 100,000,000 shares authorized; 50,684,095 issued and outstanding at March 31, 2016 and December 31, 2015, respectively.	$ 50,684	$ 50,684
Additional paid-in capital	49,692,739	49,641,620
Accumulated deficit	(41,723,969)	(40,622,774)
Total American DG Energy Inc. stockholders’ equity	8,019,454	9,069,530
Noncontrolling interest	1,839,690	2,045,779
Total stockholders' equity	9,859,144	11,115,309
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 32,594,078	$ 34,022,378

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) [Parenthetical] - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock,shares issued	50,684,095	50,684,095
Common stock, shares outstanding	50,684,095	50,684,095

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Energy revenues	$ 2,050,001	$ 2,390,347
Turnkey & other revenues	151,480	117,393
Sales Revenue, Net, Total	2,201,481	2,507,740
Cost of sales
Fuel, maintenance and installation	1,482,658	1,727,653
Depreciation expense	551,076	508,457
Cost of Goods and Services Sold, Total	2,033,734	2,236,110
Gross profit	167,747	271,630
Operating expenses
General and administrative	677,730	861,062
Selling	153,453	340,693
Engineering	249,492	170,370
Operating Expenses, Total	1,080,675	1,372,125
Loss from operations	(912,928)	(1,100,495)
Other income (expense), net
Interest and other income	12,841	18,266
Interest expense	(337,048)	(312,456)
Change in fair value of warrant liability	0	6,398
Other income (expense), total	(324,207)	(287,792)
Loss before provision for income taxes	(1,237,135)	(1,388,287)
Provision for income taxes	(66,427)	(7,355)
Consolidated net loss	(1,303,562)	(1,395,642)
Loss attributable to the noncontrolling interest	202,367	183,208
Net loss attributable to American DG Energy Inc.	$ (1,101,195)	$ (1,212,434)
Net loss per share - basic and diluted (in dollars per share)	$ (0.02)	$ (0.02)
Weighted average shares outstanding - basic and diluted (in shares)	50,684,095	50,735,381

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss attributable to American DG Energy, Inc.	$ (1,101,195)	$ (1,212,434)
Loss attributable to noncontrolling interest	(202,367)	(183,208)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	563,959	519,501
Amortization of deferred financing costs	10,141	1,726
Amortization of convertible debt premium	(15,045)	(24,072)
Decrease in fair value of warrant liability	0	(6,398)
Non-cash interest expense	273,045	299,910
Stock-based compensation	60,655	150,459
Changes in operating assets and liabilities:
Accounts receivable and unbilled revenue	(317,281)	(45,520)
Due from related party	(1,104)	(9,287)
Inventory	44,832	99,050
Prepaid and other current assets	283,728	(295,912)
Increase (decrease) in:
Accounts payable	54,225	326,998
Accrued expenses and other current liabilities	75,977	(180,128)
Due to related party	(560,337)	(322,419)
Other long-term liabilities	0	(2,227)
Net cash used in operating activities	(830,767)	(883,961)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(750,954)	(1,094,737)
Proceeds from sale of property and equipment	10,250	0
Net cash used in investing activities	(740,704)	(1,094,737)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchases of common stock, net of costs	0	(100,545)
Payment on related party note payable	0	(1,000,000)
Distributions to noncontrolling interest	(13,258)	(71,728)
Net cash used in financing activities	(13,258)	(1,172,273)
Net decrease in cash and cash equivalents	(1,584,729)	(3,150,971)
Cash and cash equivalents, beginning of the period	5,587,528	11,825,915
Cash and cash equivalents, end of the period	4,002,799	8,674,944
Supplemental disclosures of cash flows information:
Interest	0	0
Income taxes	$ 0	$ 20,430

Description of Business and Bas

Description of Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Description of Business American DG Energy Inc., or the Company, we, our or us, distributes, owns, operates and maintains clean, on-site energy systems that produce electricity, hot water, heat and cooling. The Company's business model is to own the equipment that it installs at customers' facilities and to sell the energy produced by these systems to its customers on a long-term contractual basis at prices guaranteed to the customer to be below conventional utility rates. The Company calls this business the American DG Energy “On-Site Utility”. The Company has experienced total net losses since inception of approximately $42 million . For the foreseeable future, the Company expects to experience continuing operating losses and negative cash flows from operations as its management executes the current business plan. The Company believes that its existing resources, including cash and cash equivalents and future cash flow from operations, are sufficient to meet the working capital requirements of its existing business for the foreseeable future, including the next twelve months. However, as the Company continues to grow its business by adding more energy systems, cash requirements will increase, and the Company may need to raise additional capital through debt financings or equity offerings to meet its operating and capital needs. There can be no assurance, however, that the Company will be successful in its fundraising efforts or that additional funds will be available on acceptable terms, if at all. In 2015, the Company began executing the Initiative. The Initiative is focused on effectively investing the Company’s capital by increasing the performance of its existing sites. The goal of the Initiative is to make strategic capital improvements aimed at increasing productivity of the existing portfolio while optimizing the Company’s margins and increasing cash flow. The Company expects that the Initiative will provide a strong foundation of high performing assets that may be used to fund future growth. On May 4, 2016, the Company exchanged approximately 14.72 million of its shares in EuroSite Power, or 22% of its 48% ownership in its European subsidiary, for elimination of a portion of the outstanding 6% convertible debentures due May 2018. With this swap of EuroSite Power shares in exchange for partial extinguishment of the convertible debt, American DG Energy reduced the convertible debt outstanding to $8.6 million . The Company is pursuing a similar debt exchange transaction for the remaining convertible debt outstanding and expects to complete that subsequent transaction in the coming weeks. Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 . The condensed consolidated balance sheet at December 31, 2015 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in American DG Energy Inc.’s Annual Report on Form 10-K for the year ended December 31, 2015 . There have been no significant changes in accounting principles, practices or methods for making estimates. The accompanying unaudited consolidated financial statements include the accounts of the Company and entities in which it has a controlling financial interest. Those entities include the Company's 51.0% owned joint venture, American DG New York, LLC, or ADGNY, and its 48.0% owned subsidiary EuroSite Power Inc., or EuroSite Power. The Company has determined EuroSite Power to be a Variable Interest Entity (VIE) and for which the Company has determined it is the primary beneficiary (Note 8. "Variable Interest Entity”). The Company’s operations are comprised of one business segment. The Company’s business is selling energy in the form of electricity, heat, hot water and cooling to its customers under long-term sales agreements. Reclassification Certain prior year amounts have been reclassified to conform with current year presentation.

Loss per Common Share

Loss per Common Share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Loss Per Common Share	Loss Per Common Share The Company computes basic loss per share by dividing net income (loss) for the period by the weighted average number of shares of common stock outstanding during the period. The Company computes diluted earnings per common share using the treasury stock method. For purposes of calculating diluted earnings per share, the Company considers its shares issuable in connection with convertible debentures, stock options and warrants to be dilutive common stock equivalents when the exercise price is less than the average market price of its common stock for the period. For the three months ended March 31, 2016 , the Company excluded 14,428,583 potentially dilutive shares, and for the three months ended March 31, 2015 , the Company excluded 15,763,083 potentially dilutive shares because such shares would be anti-dilutive as a result of the reported net loss.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes in the accompanying unaudited consolidated statements of operations for the three months ended March 31, 2016 and 2015 differ from that which would be expected by applying the federal statutory tax rate primarily due to losses for which no benefit is recognized.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The fair value topic of the FASB Accounting Standards Codification defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting guidance also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value: Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. The Company currently does not have any Level 1 financial assets or liabilities. Level 2 - Observable inputs other than quoted prices included in Level 1. Level 2 inputs include quoted prices for identical assets or liabilities in non-active markets, quoted prices for similar assets or liabilities in active markets and inputs other than quoted prices that are observable for substantially the full term of the asset or liability. The Company considers its convertible debentures a level 2 liability and believes that its carrying value approximates fair value. Level 3 - Unobservable inputs reflecting management’s own assumptions about the input used in pricing the asset or liability. In connection with recognizing the distribution of energy systems to the noncontrolling interest in ADGNY (see Note 5. "Stockholders' Equity"), the Company utilized Level 3 category fair value measurements. Those measurements employed the use of discounted cash flow analysis to determine the fair value of those energy systems. The estimated expected cash flows were discounted at a rate of 12% per annum.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity On January 29, 2015 , the Company entered into an exchange agreement, (or the "Exchange Agreement"), with IN Holdings Corp., a holder of more than 5% percent of the Company’s common stock, (or "IN Holdings"). In connection with the Exchange Agreement, IN Holdings transferred to the Company 1,320,000 shares of the Company’s common stock that it owned, and in exchange, the Company transferred to IN Holdings 1,320,000 shares of the common stock of EuroSite Power Inc. that it owned. The exchange was accounted for as an acquisition and retirement of treasury shares and a disposal of partial ownership of a consolidated subsidiary. As the Company retained a controlling financial interest following the exchange, no gain or loss was recognized on the disposal in accordance with ASC 810-10-45-23. In accordance with ASC 845-10-05-4, nonmonetary transactions, the fair value of the shares surrendered by the Company in the exchange were used to value the exchange. On September 19, 2014, the Board of Directors of the Company approved a common stock repurchase program that shall not exceed 1,000,000 shares of common stock and shall not exceed $1,100,000 of cost. The approval allows for purchases over a 24 -month period at prices not to exceed $1.30 per share. During the first three months of 2016 , the Company did not repurchase any shares of its common stock. See Part II, Item 2, "Unregistered Sales of Equity Securities and Use of Proceeds", for further details. During the second quarter of 2015, the Company entered into an agreement with the noncontrolling interest joint venture partner in ADGNY, whereby, in exchange for $100,000 cash and 100,000 shares of the Company’s common stock, the noncontrolling interest partner relinquished certain economic interests in certain energy system projects in the joint venture sites owned and operated by ADGNY; and ownership of certain energy system projects owned by ADGNY was transferred to the Company; and ownership of certain energy system projects owned by ADGNY was transferred to the noncontrolling interest joint venture partner. Additionally, the interests in underlying energy system projects remaining in the joint venture following the transfers of ownership of those energy system projects described in the preceding sentence, were adjusted to 51% and 49% for the Company and the noncontrolling interest joint venture partner in ADGNY, respectively. Following the foregoing series of transactions, the Company retained a controlling 51% legal interest and had a 51% economic interest in ADGNY. The relinquishment by the noncontrolling interest partner of certain economic interests in certain energy system projects in the joint venture sites owned and operated by ADGNY for the benefit of the Company and the adjustment of the respective interests in underlying energy system projects remaining in the joint venture were treated as changes in the Company’s ownership interest in ADGNY while the Company retained a controlling financial interest, and accordingly, were accounted for as equity transactions in accordance with ASC 810-10-45-23. The transfer of ownership of certain energy system projects owned by ADGNY to the noncontrolling interest joint venture partner was treated as a dividend of nonmonetary assets and was recognized at the fair value of the energy systems transferred in accordance with ASC 845-10-30-1, with a gain of $157,870 recognized in interest and other income, which is attributed entirely to the noncontrolling interest in the accompanying financial statements.

Related parties

Related parties	3 Months Ended
	Mar. 31, 2016
Related Party Transactions [Abstract]
Related Parties	Related Parties EuroSite Power, Tecogen, Ilios Inc., or Ilios are affiliated companies by virtue of common ownership and common leadership. The Company purchases the majority of its cogeneration units from Tecogen, an affiliate company sharing similar ownership. In addition, Tecogen pays certain operating expenses, including benefits and payroll, on behalf of the Company, and the Company leases office space from Tecogen. The Company's lease with Tecogen expires on July 31, 2016 and renews automatically until cancelled by one of the parties. These costs were reimbursed by the Company. As of March 31, 2016 , the Company owed Tecogen $611,526 , and Tecogen owed the Company $84,389 . During the first quarter of 2015, Eurosite Power repaid $1,000,000 of a related party $3,000,000 note payable in accordance with the terms of the note. On July 7, 2015, EuroSite Power, one of the Company's consolidated subsidiaries, entered into a Revolving Line of Credit Agreement, (or the "Agreement"), with Elias Samaras, EuroSite Power's Chief Executive Officer and President and a member of the Company's Board of Directors. Under the terms of the Agreement, Dr. Samaras has agreed to lend EuroSite Power up to an aggregate of $1,000,000 , upon written request. Any amounts borrowed by EuroSite Power pursuant to the Agreement will bear interest at 6% per year. Interest is due and payable quarterly in arrears. Repayment of the principal amount borrowed pursuant to the Agreement will be due on June 30, 2017. Prepayment of any amounts due under the Agreement may be made at any time without penalty. As of March 31, 2016 , no amounts have been drawn on this line.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company has certain commitments under agreements with Tecogen, Ilios, and other related parties (see Note 6. "Related Parties"). The Company, in the ordinary course of business is involved in various legal matters, the outcomes of which are not expected to have a material impact on the Company's condensed consolidated financial statements.

Variable Interest Entity

Variable Interest Entity	3 Months Ended
	Mar. 31, 2016
Variable Interest Entity Disclosure [Abstract]
Variable Interest Entity	Variable Interest Entity The carrying amount and classification of assets and liabilities of the Company's consolidated subsidiary EuroSite Power, which is considered to be a variable interest entity, and for which the Company has determined it is the primary beneficiary, were as follows as March 31, 2016 and December 31, 2015 : March 31, 2016 December 31, 2015 Current assets $1,081,651 $1,450,034 Long-term assets 7,622,395 7,527,266 Current liabilities 823,013 699,086 Long-term liabilities 4,512,350 4,536,422

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On May 4, 2016, the Company exchanged approximately 14.72 million of its shares in EuroSite Power, or 22% of its 48% ownership in its European subsidiary, for elimination of a portion of the outstanding 6% convertible debentures due May 2018. With this swap of EuroSite Power shares in exchange for partial extinguishment of the convertible debt, American DG Energy reduced the convertible debt outstanding to $8.6 million . The Company is pursuing a similar debt exchange transaction for the remaining convertible debt outstanding and expects to complete that subsequent transaction in the coming weeks. On May 12, 2016, in a private placement of its common stock, EuroSite Power raised $7.25 million at $0.575 per share from various accredited investors. EuroSite plans to use these funds to first pay off its debt to its Chairman, of $2,000,000 , with the balance to be used to fund operations and growth. Closing has been set for June 8, 2016. The Company has evaluated subsequent events through the date of this filing and determined that no other subsequent events occurred that would require recognition in the consolidated financial statements or disclosure in the notes thereto.

Description of Business and B15

Description of Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	American DG Energy Inc., or the Company, we, our or us, distributes, owns, operates and maintains clean, on-site energy systems that produce electricity, hot water, heat and cooling. The Company's business model is to own the equipment that it installs at customers' facilities and to sell the energy produced by these systems to its customers on a long-term contractual basis at prices guaranteed to the customer to be below conventional utility rates. The Company calls this business the American DG Energy “On-Site Utility”. The Company has experienced total net losses since inception of approximately $42 million . For the foreseeable future, the Company expects to experience continuing operating losses and negative cash flows from operations as its management executes the current business plan. The Company believes that its existing resources, including cash and cash equivalents and future cash flow from operations, are sufficient to meet the working capital requirements of its existing business for the foreseeable future, including the next twelve months. However, as the Company continues to grow its business by adding more energy systems, cash requirements will increase, and the Company may need to raise additional capital through debt financings or equity offerings to meet its operating and capital needs. There can be no assurance, however, that the Company will be successful in its fundraising efforts or that additional funds will be available on acceptable terms, if at all. In 2015, the Company began executing the Initiative. The Initiative is focused on effectively investing the Company’s capital by increasing the performance of its existing sites. The goal of the Initiative is to make strategic capital improvements aimed at increasing productivity of the existing portfolio while optimizing the Company’s margins and increasing cash flow. The Company expects that the Initiative will provide a strong foundation of high performing assets that may be used to fund future growth. On May 4, 2016, the Company exchanged approximately 14.72 million of its shares in EuroSite Power, or 22% of its 48% ownership in its European subsidiary, for elimination of a portion of the outstanding 6% convertible debentures due May 2018. With this swap of EuroSite Power shares in exchange for partial extinguishment of the convertible debt, American DG Energy reduced the convertible debt outstanding to $8.6 million . The Company is pursuing a similar debt exchange transaction for the remaining convertible debt outstanding and expects to complete that subsequent transaction in the coming weeks.
Basis of Presentation	The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 . The condensed consolidated balance sheet at December 31, 2015 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in American DG Energy Inc.’s Annual Report on Form 10-K for the year ended December 31, 2015 . There have been no significant changes in accounting principles, practices or methods for making estimates. The accompanying unaudited consolidated financial statements include the accounts of the Company and entities in which it has a controlling financial interest. Those entities include the Company's 51.0% owned joint venture, American DG New York, LLC, or ADGNY, and its 48.0% owned subsidiary EuroSite Power Inc., or EuroSite Power. The Company has determined EuroSite Power to be a Variable Interest Entity (VIE) and for which the Company has determined it is the primary beneficiary (Note 8. "Variable Interest Entity”). The Company’s operations are comprised of one business segment. The Company’s business is selling energy in the form of electricity, heat, hot water and cooling to its customers under long-term sales agreements.

Variable Interest Entity (Table

Variable Interest Entity (Tables)	3 Months Ended
	Mar. 31, 2016
Variable Interest Entity Disclosure [Abstract]
Schedule of Variable Interest Entities	The carrying amount and classification of assets and liabilities of the Company's consolidated subsidiary EuroSite Power, which is considered to be a variable interest entity, and for which the Company has determined it is the primary beneficiary, were as follows as March 31, 2016 and December 31, 2015 : March 31, 2016 December 31, 2015 Current assets $1,081,651 $1,450,034 Long-term assets 7,622,395 7,527,266 Current liabilities 823,013 699,086 Long-term liabilities 4,512,350 4,536,422

Description of Business and B17

Description of Business and Basis of Presentation (Details) shares in Thousands	May. 04, 2016USD ($)shares	Mar. 31, 2016USD ($)segment	Dec. 31, 2015USD ($)
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Accumulated deficit		$ (41,723,969)	$ (40,622,774)
Number of operating segments | segment		1
American DG New York, LLC
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage of owned subsidiary		51.00%
EuroSite Power Inc.
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage of owned subsidiary		48.00%
6% Convertible Debentures | Subsequent Event
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest rate on convertible debt (percent)	6.00%
Amount of debt converted to equity	$ 8,600,000
6% Convertible Debentures | Subsequent Event | EuroSite Power Inc.
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Shares issued in conversion of debt (shares) | shares	14,720
Ownership interest in subsidiary exchanged in conversion of debt (percent)	22.00%

Loss per Common Share (Details)

Loss per Common Share (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Potentially dilutive securities excluded from computation of earnings per share	14,428,583	15,763,083

Fair Value Measurements - Narr

Fair Value Measurements - Narrative (Details)	3 Months Ended
	Mar. 31, 2016
Fair Value, Inputs, Level 3 | American DG New York, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected future cash flow discount, percent	12.00%

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($)	Jan. 29, 2015	Sep. 19, 2014	Mar. 31, 2016	Jun. 30, 2015
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling interests	5.00%
Stock repurchase program, number of shares authorized to be repurchased		1,000,000
Stock repurchase program, amount authorized		$ 1,100,000
Stock repurchase program, period in force		24 months
Stock repurchase program, maximum authorized purchase price per share		$ 1.30
Stock repurchase program, stock repurchased during period, shares			0
Gain (Loss) on Disposition of Assets			$ 157,870
American DG New York, LLC
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling interests			49.00%
Payments to acquire projects				$ 100,000
Stock Issued During Period, Shares, Purchase of Assets				100,000
Equity Method Investment, Ownership Percentage			51.00%
Equity Method Investment, Ownership Percentage, Legal Interest			51.00%
Equity Exchange Agreement | IN Holdings, Inc.
Related Party Transaction [Line Items]
Treasury stock acquired and subsequently retired	1,320,000
Stock transferred in disposal of partial ownership in consolidated subsidiary	1,320,000

Related parties (Details)

Related parties (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Jul. 07, 2015
Related Party Transaction [Line Items]
Payment on related party note	$ 0	$ 1,000,000
Note payable - related party	2,000,000		$ 2,000,000
Affiliated Entity | Tecogen
Related Party Transaction [Line Items]
Due to related parties	611,526
Due from related parties	84,389
Affiliated Entity | EuroSite Power Inc.
Related Party Transaction [Line Items]
Payment on related party note		1,000,000
Board of Directors Chairman
Related Party Transaction [Line Items]
Note payable - related party		$ 3,000,000
Board of Directors Chairman | EuroSite Power Inc. | Line of Credit | Revolving Credit Facility
Related Party Transaction [Line Items]
Revolving line of credit maximum borrowing capacity				$ 1,000,000
Annual interest percentage				6.00%
Line of credit outstanding	$ 0

Variable Interest Entity (Detai

Variable Interest Entity (Details) - Variable Interest Entity, Primary Beneficiary - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Current Assets
Variable Interest Entity [Line Items]
Variable interest entity, assets	$ 1,081,651	$ 1,450,034
Noncurrent Assets
Variable Interest Entity [Line Items]
Variable interest entity, assets	7,622,395	7,527,266
Current Liabilities
Variable Interest Entity [Line Items]
Variable interest entity, liabilities	823,013	699,086
Noncurrent Liabilities
Variable Interest Entity [Line Items]
Variable interest entity, liabilities	$ 4,512,350	$ 4,536,422

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Thousands	May. 12, 2016	May. 04, 2016	Mar. 31, 2016	Mar. 31, 2015
Subsequent Event [Line Items]
Amount of debt to be repaid with proceeds			$ 0	$ 1,000,000
EuroSite Power Inc.
Subsequent Event [Line Items]
Percentage of owned subsidiary			48.00%
6% Convertible Debentures | Subsequent Event
Subsequent Event [Line Items]
Interest rate on convertible debt (percent)		6.00%
Amount of debt converted to equity		$ 8,600,000
6% Convertible Debentures | EuroSite Power Inc. | Subsequent Event
Subsequent Event [Line Items]
Shares issued in conversion of debt (shares)		14,720
Ownership interest in subsidiary exchanged in conversion of debt (percent)		22.00%
Private Placement | EuroSite Power Inc. | Subsequent Event
Subsequent Event [Line Items]
Maximum proceeds from private placement	$ 7,250,000
Share Price	$ 0.575
Board of Directors Chairman | Scenario, Forecast | Private Placement | EuroSite Power Inc.
Subsequent Event [Line Items]
Amount of debt to be repaid with proceeds	$ 2,000,000