Chugach Electric Association 10-Q 14 May 20 2020 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	3 Months Ended
	Mar. 31, 2020shares
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	33-42125
Entity Registrant Name	CHUGACH ELECTRIC ASSOCIATION INC
Entity Incorporation, State or Country Code	AK
Entity Tax Identification Number	92-0014224
Entity Address, Address Line One	5601 Electron Drive
Entity Address, City or Town	Anchorage
Entity Address, State or Province	AK
Entity Address, Postal Zip Code	99518
City Area Code	907
Local Phone Number	563-7494
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	0
Entity Central Index Key	0000878004
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Amendment Flag	false
Document Fiscal Period Focus	Q1

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Utility plant:
Electric plant in service	$ 1,253,121,567	$ 1,242,523,092
Construction work in progress	12,401,613	16,966,608
Total utility plant	1,265,523,180	1,259,489,700
Less accumulated depreciation	(563,140,061)	(556,209,740)
Net utility plant	702,383,119	703,279,960
Other property and investments, at cost:
Nonutility property	76,889	76,889
Operating lease right-of-use assets	915,237	958,111
Investments in associated organizations	7,791,125	8,148,426
Special funds	2,388,228	2,603,505
Restricted cash equivalents	64,310	108,000
Long-term prepayments	318,780	0
Total other property and investments	11,554,569	11,894,931
Current assets:
Cash and cash equivalents	5,280,739	7,271,820
Special deposits	58,300	54,300
Restricted cash equivalents	500,376	1,244,155
Marketable securities	179,327	194,183
Fuel cost under-recovery	335,760	1,445,753
Accounts receivable, net	29,383,709	30,120,230
Materials and supplies	18,318,738	18,014,480
Fuel stock	8,673,038	12,250,567
Prepayments	4,000,115	2,699,308
Other current assets	352,462	235,132
Total current assets	67,082,564	73,529,928
Other non-current assets:
Deferred charges, net	48,664,595	45,880,452
Total other non-current assets	48,664,595	45,880,452
Total assets	829,684,847	834,585,271
Equities and margins:
Memberships	1,782,028	1,776,592
Patronage capital	182,281,350	177,380,964
Other	15,337,373	15,309,357
Total equities and margins	199,400,751	194,466,913
Long-term obligations, excluding current installments:
Bonds payable	433,583,330	449,999,997
Notes payable	29,640,000	30,552,000
Less unamortized debt issuance costs	(2,635,249)	(2,684,537)
Operating lease liabilities	698,668	738,713
Total long-term obligations	461,286,749	478,606,173
Current liabilities:
Current installments of long-term obligations	20,167,236	27,056,065
Commercial paper	0	24,000,000
Short-term obligations	41,000,000	0
Accounts payable	8,845,852	8,316,375
Consumer deposits	3,697,817	4,294,770
Accrued interest	2,040,146	5,717,759
Salaries, wages and benefits	8,528,234	7,387,746
Fuel	5,103,648	6,765,881
Other current liabilities	13,344,912	12,627,008
Total current liabilities	102,727,845	96,165,604
Other non-current liabilities:
Deferred compensation	1,624,628	1,775,759
Other liabilities, non-current	470,888	398,790
Deferred liabilities	966,442	903,870
Cost of removal obligation / asset retirement obligation	63,207,544	62,268,162
Total other non-current liabilities	66,269,502	65,346,581
Total liabilities, equities and margins	$ 829,684,847	$ 834,585,271

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Consolidated Statements Of Operations [Abstract]
Operating revenues	$ 59,907,423	$ 55,827,238
Operating expenses:
Fuel	14,532,353	14,738,549
Production	5,893,994	4,858,811
Purchased power	7,373,398	6,893,011
Transmission	1,735,957	2,388,069
Distribution	3,530,433	3,556,619
Consumer accounts	1,789,045	1,713,559
Administrative, general and other	6,518,960	6,325,858
Depreciation and amortization	7,991,609	7,826,369
Total operating expenses	49,365,749	48,300,845
Interest expense:
Long-term debt and other	5,657,786	5,556,614
Charged to construction	(81,845)	(100,958)
Interest expense, net	5,575,941	5,455,656
Net operating margins	4,965,733	2,070,737
Nonoperating margins:
Interest income	106,411	169,152
Allowance for funds used during construction	32,738	45,557
Capital credits, patronage dividends and other	(118,548)	100,131
Total nonoperating margins	20,601	314,840
Assignable margins	$ 4,986,334	$ 2,385,577

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equities And Margins - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Balance	$ 194,466,913
Assignable margins	4,986,334	$ 2,385,577
Balance	199,400,751	191,987,617
Memberships [Member]
Balance	1,776,593	1,748,172
Memberships and donations received	5,435	5,570
Balance	1,782,028	1,753,742
Other Equities And Margins [Member]
Balance	15,309,357	14,952,925
Unclaimed capital credits retired	(3,073)	(1,577)
Memberships and donations received	31,089	84,435
Balance	15,337,373	15,035,783
Patronage Capital [Member]
Balance	177,380,964	177,823,597
Assignable margins	4,986,334	2,385,577
Retirement/net transfer of capital credits	(85,948)	(5,011,082)
Balance	$ 182,281,350	$ 175,198,092

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flow - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Assignable margins	$ 4,986,334	$ 2,385,577
Adjustments to reconcile assignable margins to net cash provided by operating activities:
Depreciation and amortization	7,991,609	7,826,369
Amortization and depreciation cleared to operating expenses	1,823,649	1,806,639
Allowance for funds used during construction	(32,738)	(45,557)
Write off of inventory, deferred charges and projects	50,336	395,724
Other	119,745	(96,544)
(Increase) decrease in assets:
Accounts receivable, net	711,348	2,283,765
Fuel cost under-recovery	1,109,993	0
Materials and supplies	(304,258)	(103,950)
Fuel stock	3,577,529	2,230,304
Prepayments	(1,619,587)	(1,708,606)
Other assets	(121,330)	(108,250)
Deferred charges	(4,071,210)	(1,974,444)
Increase (decrease) in liabilities:
Accounts payable	197,916	234,512
Consumer deposits	(596,953)	(346,701)
Fuel cost over-recovery	0	(978,397)
Accrued interest	(3,677,613)	(4,697,750)
Salaries, wages and benefits	1,140,488	236,701
Fuel	(1,662,233)	(82,822)
Other current liabilities	(272,430)	(311,991)
Deferred liabilities	(33,203)	(15,271)
Net cash provided by operating activities	9,317,392	6,929,308
Cash flows from investing activities:
Return of capital from investment in associated organizations	357,301	414,313
Investment in special funds	(11,089)	(7,377)
Investment in marketable securities and investments-other	(1,664)	(14,004)
Proceeds from the sale of marketable securities	0	1,200,000
Extension and replacement of plant	(6,408,084)	(10,891,794)
Net cash used in investing activities	(6,063,536)	(9,298,862)
Cash flows from financing activities:
Payments for debt issue costs	(21,033)	(31,609)
Net increase (decrease) in short-term obligations	17,000,000	24,000,000
Repayments of long-term obligations	(24,214,667)	(24,214,667)
Memberships and donations received	33,452	88,428
Retirement of patronage capital and estate payments	(85,948)	(111,082)
Proceeds from consumer advances for construction	1,255,790	1,108,603
Net cash (used in) provided by financing activities	(6,032,406)	839,673
Net change in cash, cash equivalents, and restricted cash equivalents	(2,778,550)	(1,529,881)
Cash, cash equivalents, and restricted cash equivalents at beginning of period	8,623,975	7,428,969
Cash, cash equivalents, and restricted cash equivalents at end of period	5,845,425	5,899,088
Supplemental disclosure of non-cash investing and financing activities:
Cost of removal obligation	939,382	(3,522,020)
Extension and replacement of plant included in accounts payable	1,667,020	2,518,520
Patronage capital retired/net transferred and included in other current liabilities	1,931,295	8,361,958
Supplemental disclosure of cash flow information - interest expense paid, net of amounts capitalized	$ 8,981,474	$ 9,867,631

Presentation Of Financial Infor

Presentation Of Financial Information	3 Months Ended
	Mar. 31, 2020
Presentation Of Financial Information [Abstract]
Presentation Of Financial Information	1. PRESENTATION OF FINANCIAL INFORMATION  The accompanying unaudited interim financial statements include the accounts of Chugach Electric Association, Inc. (“Chugach”) and have been prepared in accordance with generally accepted accounting principles for interim financial information. Accordingly, they do not include all of the information and footnotes required by United States of America generally accepted accounting principles (“U.S. GAAP”) for complete financial statements. They should be read in conjunction with Chugach’s audited financial statements for the year ended December 31, 2019, filed as part of Chugach’s annual report on Form 10-K. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The results of operations for interim periods are not necessarily indicative of the results that may be expected for an entire year or any other period. 

Description Of Business

Description Of Business	3 Months Ended
	Mar. 31, 2020
Description Of Business [Abstract]
Description Of Business	2. DESCRIPTION OF BUSINESS  Chugach is one of the largest electric utilities in Alaska. Chugach is engaged in the generation, transmission and distribution of electricity in the Anchorage and upper Kenai Peninsula areas. Chugach is on an interconnected regional electrical system referred to as the Alaska Railbelt, a 400 -mile-long area stretching from the coastline of the southern Kenai Peninsula to the interior of the state, including Alaska's largest cities, Anchorage and Fairbanks.  Chugach’s retail and wholesale members are the consumers of the electricity sold. Chugach supplies much of the power requirements of the City of Seward (“Seward”), as a wholesale customer. Occasionally, Chugach sells available generation, in excess of its own needs, to Matanuska Electric Association, Inc. (“MEA”), Homer Electric Association, Inc. (“HEA”), Golden Valley Electric Association, Inc. (“GVEA”) and Anchorage Municipal Light & Power (“ML&P”).  Chugach was organized as an Alaska electric cooperative in 1948 and operates on a not ‑for ‑profit basis and, accordingly, seeks only to generate revenues sufficient to pay operating and maintenance costs, the cost of purchased power, capital expenditures, depreciation, and principal and interest on all indebtedness and to provide for reserves. Chugach is subject to the regulatory authority of the Regulatory Commission of Alaska (“RCA”).  The consolidated financial statements include the activity of Chugach and of Chugach’s interest in the Beluga River Unit (“BRU”). Chugach accounts for its share of BRU activity using proportional consolidation (see Note 11 – Beluga River Unit ). Intercompany activity has been eliminated for presentation of the consolidated financial statements.  Chugach has three Collective Bargaining Agreements (“CBA’s”) with the International Brotherhood of Electrical Workers (“IBEW”), representing approximately 70% of its workforce. Chugach also has an agreement with the Hotel Employees and Restaurant Employees (“HERE”). All three IBEW CBA’s are effective th rough June 30, 2021, provide for wage increases in all years and include health and welfare premium cost sharing provisions. The HERE contract is effective through June 30, 2021 , and provides for wage, pension contribution, and health and welfare contribution increases in all years.

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2020
Significant Accounting Policies [Abstract]
Significant Accounting Policies	3. SIGNIFICANT ACCOUNTING POLICIES  a. Management Estimates  In preparing the financial statements in conformity with U.S. GAAP, the management of Chugach is required to make estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the balance sheet and revenues and expenses for the reporting period. Estimates include allowance for doubtful accounts, workers’ compensation liability, deferred charges and liabilities, unbilled revenue, estimated useful life of utility plant, cost of removal and asset retirement obligation (“ARO”), and remaining proven BRU reserves. Actual results could differ from those estimates.  b. Regulation  The accounting records of Chugach conform to the Uniform System of Accounts as prescribed by the Federal Energy Regulatory Commission (“FERC”). Chugach meets the criteria, and accordingly, follows the accounting and reporting requirements of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 980, “Topic 980 - Regulated Operations.” FASB ASC 980 provides for the recognition of regulatory assets and liabilities as allowed by regulators for costs or credits that are reflected in current rates or are considered probable of being included in future rates. Chugach’s regulated rates are established to recover all of the specific costs of providing electric service. In each rate filing, rates are set at levels to recover all of the specific allowable costs and those rates are then collected from retail and wholesale customers. The regulatory assets or liabilities are then reduced as the cost or credit is reflected in earnings and our rates.  c. Income Taxes  Chugach is exempt from federal income taxes under the provisions of Section 501(c)(12) of the Internal Revenue Code and for the three month periods ended March 31, 2020, and 2019, was in compliance with that provision.  Chugach applies a more-likely-than-not recognition threshold for all tax uncertainties. FASB ASC 740, “Topic 740 – Income Taxes,” only allows the recognition of those tax benefits that have a greater than 50% likelihood of being sustained upon examination by the taxing authorities. Chugach’s management reviewed Chugach’s tax positions and determined there were no outstanding or retroactive tax positions that were not highly certain of being sustained upon examination by the taxing authorities.  d. Cash, Cash Equivalents, and Restricted Cash Equivalents  The following table provides a reconciliation of cash, cash equivalents, and restricted cash equivalents reported within the Consolidated Balance Sheet that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows.     March 31, 2020 December 31, 2019  Cash and cash equivalents $ 5,280,739 $ 7,271,820  Restricted cash equivalents 500,376 1,244,155  Restricted cash equivalents included in other property and investments 64,310 108,000  Total cash, cash equivalents and restricted cash equivalents shown in the consolidated statements of cash flows $ 5,845,425 $ 8,623,975  Restricted cash equivalents include funds on deposit for future workers’ compensation claims. Restricted assets, including cash equivalents, are recognized on Chugach’s Consolidated Balance Sheet when they are restricted as to withdrawal or usage.  e. Marketable Securities  Chugach’s marketable securities consist of bond mutual funds, corporate bonds, and certificates of deposit with a maturity less than 12 months, classified as trading securities, reported at fair value with gains and losses in earnings. Interest and dividend income from marketable securities is included in nonoperating margins – interest income, and was $12.8 thousand and $62.9 thousand at March 31, 2020, and 2019, respectively. Net gains and losses on marketable securities are included in nonoperating margins – capital credits, patronage dividends and other, and are summarized as follows:     Three months ended March 31, 2020 Three months ended March 31, 2019  Net gains and (losses) recognized during the period on trading securities $ (16,520) $ 87,952  Less: Net gains and (losses) recognized during the period on trading securities sold during the period 0 0  Unrealized gains and (losses) recognized during the reporting period on trading securities still held at the reporting date $ (16,520) $ 87,952  f. Accounts Receivable  Included in accounts receivable are amounts invoiced to ML&P for their proportionate share of current Southcentral Power Project (“SPP”) costs, which amounted to $1.2 million and $ 1.0 million at March 31, 2020, and December 31, 2019, respectively.  g. Fuel Stock  Fuel stock is the weighted average cost of fuel injected into Cook Inlet Natural Gas Storage, LLC (“CINGSA”). Chugach’s fuel balance in storage amounted to $8.7 million and $12.3 million at March 31, 2020, and December 31, 2019, respectively.  h. Investments in Associated Organizations  Chugach’s investments in associated organizations are considered equity securities without readily determinable fair values, and as such are measured at cost minus impairment, if any. There were no impairments of these investments recognized during the three months ended March 31 , 20 20 , or 201 9 .

Revenue From Contracts With Cus

Revenue From Contracts With Customers	3 Months Ended
	Mar. 31, 2020
Revenue From Contracts With Customers [Abstract]
Revenue From Contracts With Customers	4. REVENUE FROM CONTRACTS WITH CUSTOMERS  a. Nature of goods and services  The following is a description of the contracts and customer classes from which Chugach generates revenue.  i. Energy Sales  Energy sales revenues are Chugach’s primary source of revenue, representing approximately 97.5% of total operating revenue during the three months ended March 31, 2020, and 2019, respectively. Energy sales revenues are recognized upon delivery of electricity, based on billing rates authorized by the RCA, which are applied to customers’ usage of electricity. Chugach’s rates are established, in part, on test period sales levels that reflect actual operating results. Chugach's tariffs include provisions for the recovery of gas costs according to gas supply contracts and costs associated with the BRU operations, as well as purchased power costs.  Expenses associated with electric services include fuel purchased from others and produced from Chugach’s interest in the BRU, both of which are used to generate electricity, as well as power purchased from others. Chugach is authorized by the RCA to recover fuel and purchased power costs through the fuel and purchased power adjustment process, which is adjusted quarterly to reflect increases and decreases of such costs . The amount of fuel and purchased power revenue recognized is equal to actual fuel and purchased power costs. We recognize differences between projected recoverable fuel and purchased power costs and amounts actually recovered through rates. The fuel cost under/over recovery on our balance sheet represents the net accumulation of any under- or over-collection of fuel and purchased power costs. Fuel cost under-recovery will appear as an asset on our balance sheet and will be collected from our members in subsequent periods. Conversely, fuel cost over-recovery will appear as a liability on our balance sheet and will be refunded to our members in subsequent periods.   Customer Class Nature, timing of satisfaction of performance obligations, and significant payment terms  Retail Retail energy customers can have up to four components of monthly billing included in revenue – energy, fuel and purchased power, demand and customer charge. The energy rate and fuel and purchased power surcharge are applied by kilowatt hour (kWh) usage. The demand charge is applied by kilowatt (kW). The customer charge is a monthly amount applied by meter. Wholesale Classified as firm energy sales. Four components of monthly billing are included in revenue – energy, fuel and purchased power, demand and customer charge. The energy rate and fuel and purchased power surcharge are applied by kWh usage. The demand charge is applied by kW. The customer charge is a monthly amount applied by meter. Economy Classified as non-firm energy sales. Three components of monthly billing are included in revenue – fuel, operations and maintenance, and margin. The actual fuel costs are billed per thousand cubic feet (Mcf) used. The operations and maintenance and margin rates are applied by megawatt hour (MWh) usage.  Payment on energy sales invoices to all customer classes above are due within 15 to 30 days.  Chugach calculates unbilled revenue, for residential and commercial customers, at the end of each month to ensure the recognition of a full month of revenue. Chugach accrued $9,634,896 and $7,996,257 of unbilled retail revenue at March 31, 2020, and 2019, respectively, which is included in accounts receivable on the balance sheet. Revenue derived from wholesale and economy customers is recorded from metered locations on a calendar month basis, so no estimation is required.  The collectability of our energy sales is very high with typically 0.10% written off as bad debt expense, adjusted annually. As it relates to the collectability of our energy sales during COVID-19, see “ Item 1 – Financial Statements – Note 5 – Regulatory Matters – Senate Bill 241. ”  There were no costs associated with obtaining any of these contracts, therefore no asset was recognized or recorded associated with obtaining any contract.  ii. Wheeling  Wheeling represented 1.7% and 1.4% of our revenue during the three months ended March 31, 2020, and 2019, respectively. Wheeling was recorded through the wheeling of energy across Chugach’s transmission lines at rates set by utility tariff and approved by the RCA . The rates are applied to MWh of energy wheeled. The collectability of wheeling is very high, with no adjustment required.  iii. Other Miscellaneous Services  Other miscellaneous services consist of various agreements including dispatch service and gas transfer agreements, pole rentals and microwave bandwidth. Revenue from these agreements is billed monthly and represented 0.8% and 1.1% of our total operating revenue during the three months ended March 31, 2020, and 2019, respectively. The revenue recognized from these agreements is recorded as the service is provided over a period of time. The collectability of these agreements is very high, with no adjustment required.  b. Disaggregation of Revenue  The table below details the revenue recognized by customer class and disaggregates base revenue from fuel and purchased power revenue recognized in the Consolidated Statement of Operations for the first quarter of 20 20 and 201 9 (in millions).     Base Rate Sales Revenue Fuel and Purchased Power Revenue Total Revenue  2020 2019 % Variance 2020 2019 % Variance 2020 2019 % Variance  Retail $ 37.1 $ 33.1 12.1 % $ 19.7 $ 19.9 (1.0 %) $ 56.8 $ 53.0 7.2 %  Wholesale $ 0.7 $ 0.5 40.0 % $ 0.9 $ 0.9 0.0 % $ 1.6 $ 1.4 14.3 %  Economy $ 0.0 $ 0.0 0.0 % $ 0.0 $ 0.0 0.0 % $ 0.0 $ 0.0 0.0 %  Total Energy Sales $ 37.8 $ 33.6 12.5 % $ 20.6 $ 20.8 (1.0 %) $ 58.4 $ 54.4 7.4 %  Wheeling $ 0.0 $ 0.0 0.0 % $ 1.1 $ 0.8 37.5 % $ 1.1 $ 0.8 37.5 %  Other $ 0.4 $ 0.6 (33.3 %) $ 0.0 $ 0.0 0.0 % $ 0.4 $ 0.6 (33.3 %)  Total Miscellaneous $ 0.4 $ 0.6 (33.3 %) $ 1.1 $ 0.8 37.5 % $ 1.5 $ 1.4 7.1 %  Total Revenue $ 38.2 $ 34.2 11.7 % $ 21.7 $ 21.6 0.5 % $ 59.9 $ 55.8 7.3 %  c. Contract Balances  The table below provides information about contract receivables and contract liabilities.     March 31, 2020 December 31, 2019  Contract receivables, included in accounts receivable $ 26,754,403 $ 26,383,976  Contract asset 335,760 1,445,753  Contract liabilities 1,378,798 1,839,514  Contract receivables represent amounts receivable from retail, wholesale, economy and wheeling.  The contract asset consists of the fuel under-recovery and represents the under-collection of fuel and purchased power costs through the fuel and purchased power adjustment process, which will be collected from customers in the following quarter.  Contract liabilities consist of credit balances and fuel cost over-recovery. Credit balances are reported as consumer deposits and represent the prepaid accounts of retail customers and are recognized in revenue as the customer uses electric service. Fuel cost over-recovery represents the over-collection of fuel and purchased power costs through the fuel and purchased power adjustment process, which will be refunded to customers through lower fuel and purchased power rates in the following quarter.  Significant changes in the contract asset balances are as follows:    March 31, 2020 December 31, 2019  Contract asset at beginning of period $ 1,445,753 $ 0  Cash received, excluding amounts recognized as revenue during the period 335,760 1,445,753  Revenue recognized and transferred from contract asset at the beginning of the period (1,445,753) 0  Contract asset at end of period $ 335,760 $ 1,445,753  Significant changes in contract liabilities balances are as follows:      March 31, 2020 December 31, 2019  Contract liabilities at beginning of period $ 1,839,514 $ 5,196,426  Cash received, excluding amounts recognized as revenue during the period 918,670 1,839,514  Revenue recognized and transferred from contract liabilities at the beginning of the period (1,379,386) (5,196,426)  Contract liabilities at end of period $ 1,378,798 $ 1,839,514  d. Transaction Price Allocated to Remaining Performance Obligations  The table below includes estimated revenue to be recognized during the remainder of 20 20 related to performance obligations that are unsatisfied (or partially unsatisfied) at March 31 , 20 20 .     2020  Credit balances $ 1,378,798  Credit balances are primarily associated with Chugach’s LevelPay program. The program calculates the monthly amount to be collected from customers annually. It is anticipated the balance will be recognized in revenue within the following year as customers consume electricity.

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2020
Regulatory Matters [Abstract]
Regulatory Matters	5. REGULATORY MATTERS  Simplified Rate Filing  Chugach is a participant in the Simplified Rate Filing (“SRF”) process for adjustments to base demand and energy rates for Chugach retail customers and wholesale customer, Seward. SRF is an expedited base rate adjustment process available to electric cooperatives in the State of Alaska, with filings made either on a quarterly or semi-annual basis. Chugach is a participant on a quarterly filing schedule basis. Chugach is required to submit filings to the RCA for approval before any rate changes can be implemented. While there is no limitation on decreases, base rate increases under SRF are limited to 8% in a 12-month period and 20% in a 36-month period.  Chugach submitted quarterly SRF filings which resulted in a system demand and energy rate increase of 3.8% effective November 1, 2019; an increase of 0.4% effective February 1, 2020; and an increase of 1.1% effective May 1, 2020.  Operation and Regulation of the Alaska Railbelt Electric and Transmission System  In June 2016, the RCA opened a docket to “evaluate the reliability and security standards and practices of Alaska Electric Utilities.” In 2017, Chugach and several other Alaska Railbelt utilities entered into a contract with GDS Associates, Inc. (“GDS”). GDS’s role was to facilitate discussion between all six Alaska Railbelt utilities and various stakeholders with a goal of submitting to the RCA organizational plans for a Railbelt Reliability Council (“RRC”), including a governance structure, that will be responsible for adoption and enforcement of uniform reliability standards and integrated transmission resource planning. GDS presented to the RCA during two technical conferences in January and March of 2018. Chugach and the other utilities provided GDS’s final recommendation of the RRC to the RCA in May 2018. During the fourth quarter of 2018, the utilities reviewed and adapted the memorandum of understanding with GDS (“GDS MOU”).  On March 15, 2019, the RCA initiated an order requesting comments on proposed legislative language which would authorize the RCA to designate or develop an Electric Reliability Organization (“ERO”). Chugach submitted comments seeking to delay adoption until the RRC Governance Board could be formed but continued to work with the RCA, Railbelt utilities and stakeholders to draft acceptable legislation.  Chugach and the members of Alaska Railbelt Cooperative Transmission and Electric Company (“ARCTEC”) continue to work with the other utilities and stakeholders to arrive at legislation and an RRC organization acceptable to all Railbelt utilities and stakeholders.  In June 2016, in response to Docket I-16-002, Railbelt Utility Information Technology and Operations Technology leadership began meeting to discuss Railbelt Cybersecurity. The Railbelt Utilities Managers group designated the Cybersecurity Working Group to review industry standards and provide a statement of work to develop Railbelt Cybersecurity Standards. On June 21, 2018, Chugach posted a Request for Proposal to hire a consultant to write the standards. The final draft was presented to the Railbelt Utility Managers on February 15, 2019 . On July 10, 2019, a status update was provided to the RCA by the Railbelt Utility Managers announcing the completion of Alaska Critical Infrastructure Protection (“AKCIP”) Cybersecurity Standards and a collective agreement for adoption effective January 1, 2020. Implementation schedules are contained in the specific standards.  In December 2019, the Railbelt utilities signed a Memorandum of Understanding to form a RRC. Alaska Senate Bill 123 (“SB 123”) provides for the creation and regulation of an electric reliability organization . The electric reliability organization will provide integrated resource planning and require preapproval for interconnection for some large energy facilities . On April 29, 2020, the Governor of Alaska signed the bill, with the section requiring the RCA to adopt regulations taking effect immediately while the section allowing the RCA to form and regulate electric reliability organizations taking effect July 1, 2021.  ML&P Acquisition  In December 2017, the Mayor of Anchorage, Alaska, announced plans to place a proposition on the April 3, 2018 municipal ballot allowing the voters to authorize the sale of ML&P to Chugach. The proposition was approved by Anchorage voters 65.08% to 34.92% per the certified election results. Chugach and the Municipality of Anchorage (“MOA”) negotiated final sales agreements and associated documents. The sale of ML&P was approved by the Anchorage Assembly on December 4, 2018 and the Chugach Board of Directors gave its final approval on December 19, 2018. The agreements and associated documents were executed on December 28, 2018. Pursuant to these agreements and associated documents, on April 1, 2019, Chugach submitted the Joint Request for Necessary Approvals for Acquisition of Anchorage Municipal Light and Power, and the Petition for Approvals Needed to Acquire Anchorage Municipal Light and Power and Application to Amend Certificate of Public Convenience and Necessity (“CPCN”) No. 8 to the RCA. The RCA accepted the filing as complete on April 18, 2019, and the procedural conferen ce was held on April 22, 2019. On May 8, 2019, the RCA issued an order indicating that a final order in the case was expected by November 19, 2019. In addition, the RCA granted the petitions to intervene filed by MEA; Providence Health and Services (“Providence”); GVEA; the Federal Executive Agencies (“FEA”); and HEA / Alaska Electric and Energy Cooperative, Inc. Hearings on the acquisition were held in August and September 2019. On October 1, 2019, all parties ag reed to an extension for the RCA’s final order in the case to February 17, 2020 , which has subsequently been extended to May 28, 2020, as described below.  In June 2019, Chugach and GVEA entered into a Memorandum of Understanding ( “ MOU ” ) in which Chugach agreed to provide GVEA non-firm energy, wheeling and ancillary services for a 3 -year period under terms and conditions consistent with its operating tariff, and will make available 5 MW of Bradley Lake capacity to GVEA for a 5 -year period. Excluding fuel, the MOU is expected to provide over $10 million of additional revenue to the Chugach system over the term of the agreement. GVEA has withdrawn its petition to intervene regarding the ML&P acquisition. On September 27, 2019, Chugach entered into an Amendment No. 1 to Asset Purchase Agreement (“APA Amendment No. 1 ”), Amendment No. 1 to Payment in Lieu of Taxes Agreement (“PILT Amendment No. ”), and Amendment No. 1 to Eklutna Power Purchase Agreement ( “PPA Amendment No. 1”) with the MOA. The APA Amendment No. 1 provides that the purchase price shall reflect the net book value of Municipal Light & Power assets at closing and amends related definitions. The PILT Amendment No. 1 revises the calculation of PILT to make it consistent with the APA Amendment. The PPA Amendment No. 1 defines the Eklutna PPA as a wholesale power agreement .  On October 28, 2019, Chugach, ML&P, Providence, FEA, MEA, Alaska Energy Authority, and ENSTAR Natural Gas Company, a Division of SEMCO Energy, Inc., filed a stipulation with the RCA resolving all disputed issues in these consolidated dockets (“Stipulation”). The Office of the Attorney General, Regulatory Affairs & Public Advocacy Section is not a party to the Stipulation. The RCA has ordered an additional hearing to consider the Stipulation.  On October 28, 2019, Chugach entered into an Amendment No. 2 to Asset Purchase and Sale Agreement (“APA Amendment No. 2”), Amendment No. 2 to Eklutna Power Purchase Agreement (“PPA Amendment No. 2”), and Amendment No. 2 to Payment in Lieu of Taxes Agreement (“PILT Amendment No. 2”) with the MOA. The APA Amendment No. 2 extends the termination date of the APA from March 31, 2020, to September 30, 2020, and recognizes the Eklutna Transmission Assets as Acquired Assets in recognition of the fulfillment of a condition in the original APA. The PPA Amendment No. 2 recognizes changes to the dispute resolution procedures contained therein and the PILT Amendment No. 2 removes Chugach’s obligation in certain regulatory or bankruptcy proceedings to support and stipulate to the fact that the payment in lieu of taxes payments are a tax obligation and should be given appropriate priority status based on that fact.  Amendment No. 3 to Asset Purchase Agreement (“APA Amendment No. 3”), Amendment No. 3 to Eklutna Power Purchase Agreement (“PPA Amendment No. 3”), and an Amended and Restated BRU Fuel Agreement, were approved by the Chugach Board on October 24, 2019, and by the MOA Assembly on October 30, 2019, and will become effective upon RCA approval. APA Amendment No. 3 reduces the upfront payment to the MOA by $10.0 million, eliminates upward price adjustments if ML&P’s net book value of the purchased assets is greater than $715.4 million at closing, and recognizes a $36.0 million rate reduction account to be funded by the MOA for the benefit of ML&P legacy customers. PPA Amendment No. 3 recognizes Chugach’s right to set-off payments to the extent the MOA does not fulfill its obligations required in the Stipulation. The amended BRU fuel agreement extends the period over which the costs and benefits of Chugach’s and ML&P’s legacy shares of BRU will be allocated to customers in each legacy service area, requires Chugach to utilize a market proxy value for legacy share BRU gas used for economy energy sales, and requires Chugach to utilize a market proxy value for any legacy share BRU gas used to serve Chugach legacy customers for transactions between the legacy service areas of Chugach and ML&P.  On February 27, 2020, the RCA issued an order extending the statutory timeline and extended the time to consider the Stipulations to May 28, 2020. For more information, see “Note 10 – ML&P ACQUISITION.”  Senate Bill 241  The Alaska House and Senate approved a bill designed to address several impacts resulting from the COVID-19 pandemic in the State of Alaska. Three sections of Senate Bill 241 (“SB 241”) affect utility operations in Alaska. A section on “tolling” allows the RCA to exceed normal deadlines. Another section of SB 241 prohibits disconnection of utility service for residential customers agreeing to a payment plan who provide a sworn statement they are unable to pay because of COVID-19 issues. This section also makes it clear that customers are not relieved of their obligation to pay. The final utility section deals with the creation of “regulatory assets” for unpaid accounts and other COVID-19-related unusual expenses. A regulatory asset provides an accounting treatment and recovery over time for out-of-the-ordinary expenses. SB 241 includes an exemption intended to keep Chugach’s acquisition of ML&P on track for a RCA decision by May 28, 2020. SB 241 also extends the date of the coronavirus emergency to November 15, 2020, unless lifted earlier. Governor Dunleavy signed the bill into law on April 9, 2020. 

Debt

Debt	3 Months Ended
	Mar. 31, 2020
Debt [Abstract]
Debt	6. DEBT  Lines of Credit  Chugach maintains a $50.0 million line of credit with National Rural Utilities Cooperative Finance Corporation (“NRUCFC”). On March 16, 2020, Chugach drew $41.0 million on this line of credit to pay the balance of commercial paper. The balance on this line of credit was subsequently paid using the senior unsecured credit facility backstopping our commercial paper program; therefore, there was no outstanding balance on this line of credit at March 31, 2020. Chugach did not utilize this line of credit during 2019, and therefore had no outstanding balance at December 31, 201 9 . The borrowing rate is calculated using the total rate per annum and may be fixed by NRUCFC, and was 3.25% at March 31 , 20 20 , and December 31, 201 9 . The NRUCFC Revolving Line Of Credit Agreement requires that Chugach, for each 12 -month period, for a period of at least five consecutive days, pay down the entire outstanding principal balance. The NRUCFC line of credit was renewed September 29, 2017, and expires September 29, 2022 . This line of credit is immediately available for unconditional borrowing.  Commercial Paper  On June 13, 2016 , Chugach entered into a $150.0 million senior unsecured credit facility (“The Credit Agreement”) which is used to back Chugach’s commercial paper program. The pricing included an all-in drawn spread of one month London Interbank Offered Rate (“LIBOR”) plus 90.0 basis points, along with a 10.0 basis points facility fee (based on an A/A2/A unsecured debt rating) . The commercial paper can be repriced between one day and 397 days. The participating banks included NRUCFC, KeyBank National Association, Bank of America, N.A., and CoBank, ACB. The Credit Agreement was due to expire on June 13, 2021 . On July 30, 2019 , Chugach entered into the First Amendment to the Credit Agreement (“Amendment”) with NRUCFC, Bank of America, N.A. KeyBank National Association, Wells Fargo Bank N.A., and CoBank, ACB. The Amendment increases the lenders’ aggregate commitments under the senior unsecured credit facility from $150 million to $300 million and extends the maturity date of the facility from June 13, 2021 , to July 30, 2024 . The Amendment also includes provisions for calculating interest on loans in ways other than the LIBOR. In addition, the Amendment permits Chugach to enter into a bridge financing to fund its potential acquisition of ML&P , of not in excess of $800 million for a term of up to eighteen (18) months. This indebtedness is in addition to other indebtedness permitted to be incurred under the existing senior unsecured credit facility. Other terms of the Credit Agreement remain materially the same.  On March 16, 2020, Chugach attempted to reprice its outstanding commercial paper. Due to volatility in the markets caused by the pandemic, t he demand for cash pushed treasuries into the negative, seizing up the commercial paper market. The lack of overall liquidity resulted in Chugach having to utilize other pre-existing credit facilities. The balance of commercial paper was initially paid using the NRUCFC line of credit, which was subsequently rolled over to the senior unsecured credit facility used to back the commercial paper program. The balance outstanding on our senior unsecured credit facility at March 31, 2020, was $41.0 million bearing interest at 1.85% .  Chugach had no commercial paper outstanding at March 31, 2020, and $24.0 million outstanding at December 31, 201 9 .  The following table provides information regarding average commercial paper balances outstanding for the quarter ended March 31 , 20 20 , and 20 19 (dollars in millions), as well as corresponding weighted average interest rates:    2020 2019  Average Balance Weighted Average Interest Rate Average Balance Weighted Average Interest Rate  $ 15.5 1.79 % $ 61.8 2.78 %  Term Loans  Chugach has a term loan facility with CoBank. Loans made under this facility are evidenced by the 2016 CoBank Note, which is governed by the Amended and Restated Master Loan Agreement dated June 30, 2016 (“CoBank Loan Agreement”), as amended November 26, 2019, and secured by the Second Amended and Restated Indenture of Trust (“Indenture”). At March 31 , 20 20 , Chugach had $ 33.2 million outstanding with CoBank.  Financing  On May 15, 2019 , Chugach issued $75.0 million of First Mortgage Bonds, 2019 Series A, due May 15, 2049 (the “Bonds”). The Bonds were issued for the purpose of repaying outstanding commercial paper used to finance Chugach’s capital improvement program and for general corporate purposes. The Bonds bear interest at the rate of 3.86% . Interest on the Bonds is due each May 15 and November 15, commencing on November 15, 2019 . Principal on the Bonds is due in varying installment amounts on an annual basis beginning May 15, 2021, resulting in an average life of approximately 12.0 years. The Bonds are secured, ranking equally with all other long-term obligations, by a first lien on substantially all of Chugach’s assets, pursuant to the Seventh Supplemental Indenture to the Indenture, which Indenture initially became effective on January 20, 2011, as previously amended and supplemented.  Debt Issuance Costs  The following table outlines debt issuance costs associated with long-term obligations, excluding current installments, at March 31 , 20 20 .    Long-term Obligations Unamortized Debt Issuance Costs  2011 Series A Bonds $ 168,333,330 $ 953,940  2012 Series A Bonds 158,250,000 842,991  2017 Series A Bonds 32,000,000 175,786  2019 Series A Bonds 75,000,000 479,064  2016 CoBank Note 29,640,000 163,634  2020 Financing 0 19,834  $ 463,223,330 $ 2,635,249  The following table outlines debt issuance costs associated with long-term obligations, excluding current installments, at December 31, 201 9 .    Long-term Obligations Unamortized Debt Issuance Costs  2011 Series A Bonds $ 178,999,997 $ 981,692  2012 Series A Bonds 162,000,000 864,613  2017 Series A Bonds 34,000,000 178,410  2019 Series A Bonds 75,000,000 488,611  2016 CoBank Note 30,552,000 171,211  $ 480,551,997 $ 2,684,537 

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2020
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	7. RECENT ACCOUNTING PRONOUNCEMENTS  Issued and adopted at March 31, 2020:  ASC Update 2016-13 “ Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ” and Related Updates  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 revised the criteria for the measurement, recognition, and reporting of credit losses on financial instruments to be recognized when expected. This update is effective for fiscal years beginning after December 15, 2019, including the interim periods within those years. Chugach began application of ASU 2016-13 on January 1, 2020. Adoption did not have a material effect on its results of operations, financial position, and cash flows.  ASC Update 2018-13 “ Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement”  In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement.” ASU 2018-13 changes the fair value measurement disclosure requirements of ASC 820. This update is effective for all entities for fiscal years beginning after December 15, 2019, including interim periods therein. Early adoption is permitted for any eliminated or modified disclosures upon issuance of this ASU. Chugach began application of ASU 2018-13 on January 1, 2020. Adoption did not have a material effect on its results of operations, financial position, and cash flows.  ASC Update 2018-15 “ Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force)”  In August 2018, the FASB issued ASU 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The ASU is effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. Chugach began application of ASU 2018-15 on January 1, 2020. Adoption did not have a material effect on its results of operations, financial position, and cash flows.  Issued, not yet adopted:  ASC Update 2018-14 “ Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans”  In August 2018, the FASB issued ASU 2018-14, “Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans.” ASU 2018-14 Modifies ASC 715-20 to improve disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The ASU is effective for fiscal years ending after December 15, 2020, for public companies. Early adoption is permitted. Chugach will begin application of ASU 2018-14 on January 1, 2021. Adoption is not expected to have a material effect on its results of operations, financial position, and cash flows. 

Leases

Leases	3 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Leases	8. LEASES  Chugach has no financing leases and several operating leases, most of which are various land easements. Chugach has five operating leases as right-of-use assets for a building, office equipment, and substation land lease, with remaining lease terms of one month to 23.5 years and a weighted average lease term of 6.54 years . Chugach’s operating lease assets are presented as operating lease right-of-use assets on the consolidated balance sheet. The current portion of operating lease liabilities is included in current installments of long-term obligations and the long-term portion is presented as operating lease liabilities on the consolidated balance sheet. A weighted average discount rate of 4.29% was used in calculating the right-to-use assets and lease liabilities. Chugach’s discount rate was calculated using our incremental borrowing rate based on the average borrowing rate of our long-term debt.  R ecognition of the right-of-use asset and operating lease liability represents a non-cash investing and financing activity. Total operating lease expense for the three months ended March 31 , 20 20 , was $66,391 .  Supplemental cash flow information associated with leases:     Three months ended March 31, 2020 Three months ended March 31, 2019  Cash paid for amounts included in the measurement of liabilities:  Operating cash flows from operating leases $ 64,141 $ 54,000  Right-of-use assets obtained in exchange for lease obligations:  Operating leases $ 10,473 $ 934,371  Supplemental balance sheet information associated with leases:     March 31, 2020 December 31, 2019  Operating lease right-of-use assets $ 915,237 $ 958,111  Operating lease liabilities 698,668 738,713  Current installments of lease liabilities 216,569 219,398  Total operating lease liabilities $ 915,237 $ 958,111  Maturities associated with lease liabilities:     March 31, 2020  2020 $ 199,744  2021 227,429  2022 227,429  2023 227,429  2024 11,429  Thereafter 165,036  Total lease payments 1,058,496  Less imputed interest 143,259  Present value of lease liabilities $ 915,237  Chugach entered into a Power Purchase Agreement with Fire Island Wind, LLC, (“FIW”) on June 21, 2011. The Fire Island Wind contract contains a lease because the agreement identifies an asset (the wind farm is explicitly specified in the agreement and FIW does not have substantive substitution rights) and Chugach controls the use of the asset (it takes 100% of the output and, to the extent there is wind, can control how and when the wind fa rm produces power directly through its supervisory control and data acquisition (“ SCADA ”) system). However, due to the exclusively variable nature of the payments related to Fire Island Wind, no new assets or liabilities have been added to the Consolidated Balance Sheet, no changes were made to the Consolidated Statements of Cash Flow, and the variable payments are still classified as purchased power expense on the Consolidated Statement s of Operations . The amount of the variable payments included in purchased power for the three months ended March 31, 2020, and 2019, was $1,243,198 and $1,242,432 , respectively.

Fair Values Of Assets And Liabi

Fair Values Of Assets And Liabilities	3 Months Ended
	Mar. 31, 2020
Fair Values Of Assets And Liabilities [Abstract]
Fair Values Of Assets And Liabilities	9. FAIR VALUES OF ASSETS AND LIABILITIES  Fair Value Hierarchy  In accordance with FASB ASC 820, Chugach groups its financial assets and liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are:  Level 1 – Valuation is based upon quoted prices for identical instruments traded in active exchange markets, such as the New York Stock Exchange. Level 1 also includes United States Treasury and federal agency securities, which are traded by dealers or brokers in active markets. Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities.  Level 2 – Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market.  Level 3 – Valuation is generated from model-based techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect Chugach’s estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques.  Chugach sold all marketable securities in the second quarter of 2019, using the funds for patronage capital payments to HEA and MEA. During the third quarter of 2019 , Chugach made a small investment in marketable securities. The table below presents the balance of Chugach’s marketable securities measured at fair value on a recurring basis at March 31, 2020, and December 31, 201 9 . Chugach’s bond mutual funds were measured using quoted prices in active markets. Chugach had no other assets or liabilities measured at fair value on a recurring basis at March 31, 20 20 , or at December 31, 2019 .       March 31, 2020 Total Level 1 Level 2 Level 3  Bond mutual funds $ 179,327 $ 179,327 $ 0 $ 0   December 31, 2019 Total Level 1 Level 2 Level 3  Bond mutual funds $ 194,183 $ 194,183 $ 0 $ 0  Fair Value of Financial Instruments  Fair value estimates are dependent upon subjective assumptions and involve significant uncertainties resulting in variability in estimates with changes in assumptions. The fair value of cash and cash equivalents, accounts receivable and payable, and other short-term monetary assets and liabilities approximate carrying value due to their short-term nature.  The estimated fair values (in thousands) of long-term debt included in long-term obligations at March 31 , 20 20 , are as follows:       Carrying Value Fair Value Level 2  Long-term obligations (including current installments) $ 483,174 $ 512,840 

ML&P Acquisition

ML&P Acquisition	3 Months Ended
	Mar. 31, 2020
Acquisition [Abstract]
ML&P Acquisition	10. ML&P ACQUISITION  In December 2017, the Mayor of Anchorage, Alaska, announced plans to place a proposition on the April 3, 2018 municipal ballot allowing the voters to authorize the sale of ML&P to Chugach. The proposition was approved by Anchorage voters 65.08% to 34.92% per the certified election results. Chugach and the MOA negotiated final sales agreem ents and associated documents. The sale of ML&P was approved by the Anchorage Assembly on December 4, 2018 and the Chugach Board of Directors gave its final approval on December 19, 2018.  On December 28, 2018, Chugach entered into the Asset Purchase and Sale Agreement (“APA”) with the MOA to acquire substantially all of the assets, and certain specified liabilities of ML&P, subject to approval by the RCA. On December 28, 2018, Chugach also entered into an Eklutna Power Purchase Agreement (“PPA Agreement”), a Payment in Lieu of Taxes Agreement (“PILT Agreement”), and a BRU Fuel Agreement (“Ancillary Agreements”) with the MOA.  During the first week of April 2019, pursuant to the APA, Chugach and the MOA jointly submitted applications to amend their respective CPCNs to permit Chugach to provide electric service in ML&P’s legacy service territory. The RCA accepted the filing as complete on April 18, 2019, and a procedural conference was held on April 22, 2019. On May 8, 2019, the RCA issued an order indicating that a final order in the case was expected by November 19, 2019. In addition, the RCA granted the petitions to intervene filed by MEA; Providence Health and Services (“Providence”); GVEA; the Federal Executive Agencies (“FEA”); and HEA / Alaska Electric and Energy Cooperative, Inc. Hearings on the acquisition were held in August and September 2019. On October 1, 2019, all parties agreed to an extension for the RCA final order in the case to February 17, 2020. The statutory timeline for issuance of a final order and to rule on the Stipulations was extended to February 28, 2020. On February 27, 2020, the RCA issued an order extending the statutory timeline and extended the time to consider the Stipulation to May 28, 2020.  In June 2019, Chugach and GVEA entered into a Memorandum of Understanding (“MOU”) in which Chugach agreed to provide GVEA non-firm energy, wheeling and ancillary services for a 3 -year period under terms and conditions consistent with its operating tariff, and will make available 5 MW of Bradley Lake capacity to GVEA for a 5 -year period. Excluding fuel, the MOU is expected to provide over $10 million of additional revenue to the Chugach system over the term of the agreement. GVEA has withdrawn its petition to intervene regarding the ML&P acquisition.  Additionally, Chugach and MOA will cooperate to obtain an order from the RCA approving the Ancillary Agreements and allowing Chugach to recover the costs associated with the transaction. Following RCA approval, a closing date will be scheduled for the transaction within 120 days. Pursuant to the original APA, u pon closing, Chugach will transfer the purchase price of $767.8 million less the estimated accrued leave liability and the estimated net book value of designated excluded assets. The APA also includes terms for post-closing purchase price adjustments. In September 2019, Chugach entered into APA Amendment No. 1, which provides that the purchase price shall reflect net book value of ML&P assets at closing and amends related definitions. In October 2019, Chugach entered into APA Amendment No. 2 extending the termination date of the APA from March 31, 2020, to September 30, 2020, and recognizing Eklutna Transmission Assets as acquired assets in recognition of the fulfillment of a condition in the original APA. Also, in October 2019, the Chugach Board and the MOA Assembly approved APA Amendment No. 3 reducing the upfront payment to the MOA by $10.0 million, eliminating upward price adjustments if ML&P’s net book value of the purchased assets is greater than $715.4 million, and recognizing a $36.0 million rate reduction account to be funded by the MOA for the benefit of the ML&P legacy customers. The Eklutna PPA, which will be effective upon closing, provides for the purchase of all or a portion of ML&P’s share of generation from the Eklutna Hydroelectric Project by Chugach from MOA for a period of 35 years at specified fixed prices each year. In September 2019, Chugach entered into PPA Amendment No. 1, which defines the Eklutna PPA as a wholesale power agreement. In October 2019, Chugach entered into PPA Amendment No. 2 to recognize changes to the dispute resolution procedures and the Chugach Board and the MOA Assembly approved PPA Amendment No. 3 to recognize Chugach’s right to set-off payments to the extent the MOA does not fulfill its obligations required in the stipulation filed with the RCA, see “ Note 5 – Regulatory Matters – ML&P Acquisition .”  The PILT Agreement, which will be effective upon closing, provides for Chugach to make annual payments in lieu of taxes to the MOA for a period of 50 years based on current millage rates and the adjusted book value of property for ML&P ’ s service territory in existence at the closing as adjusted each year. The PILT Agreement also provides that until December 31, 2033, Chugach shall only collect amounts associated with those annual PILT payments from retail customers in the legacy ML&P territory. Thereafter, the annual PILT payments shall be collected from all Chugach retail customers. In September 2019, Chugach entered into PILT Amendment No. 1 to revise the calculation of PILT to make it consistent with the APA Amendment No. 1. In October 2019, Chugach entered into PILT Amendment No. 2 to remove Chugach’s obligation in certain regulatory or bankruptcy proceedings to support and stipulate to the fact that the payments in lieu of taxes are a tax obligation and should be given appropriate priority status based on that fact.  The BRU Fuel Agreement, which will be effective upon closing, provides that through December 31, 2033, Chugach will use gas attributable to production in the portion of the BRU acquired from MOA to serve retail customers of Chugach within the legacy ML&P territory at a specified gas transfer price and will use any excess gas to serve other customers of Chugach at the same specified gas transfer price. In October 2019, the Chugach Board and the MOA Assembly approved an Amended and Restated BRU Fuel Agreement extending the period over which the costs and benefits of Chugach’s and ML&P’s legacy shares of BRU will be allocated to customers in each legacy service area. This amended agreement also requires Chugach to utilize a market proxy value for any legacy share BRU gas used for economy energy sales or for any legacy share BRU gas used to serve Chugach legacy customers for transactions between the legacy service areas of Chugach and ML&P. 

Beluga River Unit

Beluga River Unit	3 Months Ended
	Mar. 31, 2020
Acquisition [Abstract]
Beluga River Unit	11. BELUGA RIVER UNIT  The BRU is located on the western side of Cook Inlet, approximately 35 miles from Anchorage, and is an established natural gas field that was originally discovered in 1962. The BRU is jointly owned by ML&P ( 56.7% ), Hilcorp ( 33.3% ), and Chugach ( 10.0% ).  Chugach records depreciation, depletion and amortization on BRU assets based on units of production. During 2019, Chugach lifted 0.9 Billion Cubic Feet (“BCF”), resulting in a cumulative lift since purchase of 6.3 BCF. Chugach, and other owners, ML&P and Hilcorp, are operating under an existing joint operating agreement (the “Operating Agreement”). Hilcorp is the operator for BRU. In addition to the operator fees to Hilcorp, other BRU expenses include royalty expense and interest on long-term debt. All expenses other than depreciation, depletion and amortization and interest on long-term debt are included as fuel expense on Chugach’s Consolidated Statement of Operations. C osts associated with the BRU are recovered on a dollar-for-dollar basis through Chugach’s quarterly fuel and purchased power adjustment process. Chugach has applied and qualified for a small producer tax credit, provided by the State of Alaska, resulting in an estimate of no liability for production taxes for a period of ten years, through 2026.  Chugach updates the BRU fuel reserve estimate every three years and the Asset Retirement Obligation (“ARO”) every five years. During the second quarter of 2019, both the fuel reserve and the ARO were updated.  The fuel reserve study, based on the updated 2019 report, indicates that Chugach’s BRU gas reserves are 19.6 BCF , or about 3.0 BCF lower in relation to the prior field reserve estimate after adjusting for actual gas produced. The production forecast was based upon well-defined current exponential decline rates for the economic life of the Sterling and Beluga formations. Based on production rates of the existing wells and the revised reserve estimate, the estimated field life has been extended fr om December 2033 to December 2037.  The updated ARO estimate for the field is $56.9 million, comprised of $28.5 million for above ground assets and $28.4 million for below ground assets. Chugach’s share of this cost is $5.69 million. The updated ARO is higher than the prior field estimate of $33.5 million produced in the 2013 study. For Chugach, the ARO is increasing from $3.35 million to $5.69 million. Significant factors contributing to the increase include new facilities and increased regulatory requirements for remediation. The RCA opened and consolidated dockets to address BRU gas transfer prices and related matters, including the reserve study and the ARO update. Both Chugach and ML&P are parties to the proceeding. Chugach expects these matters will be adjudicated as part of future compliance filings if the acquisition of ML&P is approved. 

Environmental Matters

Environmental Matters	3 Months Ended
	Mar. 31, 2020
Environmental Matters [Abstract]
Environmental Matters	12. ENVIRONMENTAL MATTERS  Chugach includes costs associated with environmental compliance in both our operating and capital budgets. We accrue for costs associated with environmental remediation obligations when those costs are probable and reasonably estimated. We do not anticipate that environmental related expenditures will have a material effect on our results of operations or financial condition. We cannot, however, predict the nature, extent or cost of new laws or regulations relating to environmental matters.  The three utility owners of the Eklutna Hydro electric Project (Chugach, ML&P, and MEA) are obligated by a 1991 Fish & Wildlife Agreement to develop and implement measures to protect, mitigate, and enhance the fish and wildlife impacted by the project (PME program). The program is to be approved by the Governor of Alaska with completion of the program no later than October of 2032, 35 years after its purchase. The owners initiated a required consultation process with key government agencies and interested parties in March 2019. The agreement requires equal consideration of; 1) efficient and economical power production, 2) energy conservation, 3) protection, mitigation of damage to, and enhancement of fish and wildlife, 4) protection of recreation opportunities, 5) municipal water supplies, 6) preservation of other aspects of environmental quality, 7) other beneficial public uses, and 8 ) requirements of state law. The hydro electric project and municipal water system currently utilize 100% of the water inflows.  The Clean Air Act and Environmental Protection Agency (“EPA”) regulations under the Clean Air Act establish ambient air quality standards and limit the emission of many air pollutants. New Clean Air Act regulations impacting electric utilities may result from future events or new regulatory programs. An Executive Order promoting energy independence and economic growth was issued on March 28, 2017, by the President instructing the EPA to review the Clean Power Plan (“CPP”). On August 21, 2018 the EPA proposed the Affordable Clean Energy (“ACE”) rule which would establish emission guidelines for states to develop plans to address GHG emissions from existing coal-fired power plants. The final ACE rule was issued by the EPA on June 19, 2019. The final rule is certain to face legal challenge. The ACE rule, in its current form, is not expected to have a material effect on Chugach’s financial condition, results of operations, or cash flows. While Chugach cannot predict the implementation of any additional new law or regulation, or the limitations thereof, it is possible that new laws or regulations could increase capital and operating costs. Chugach has obtained or applied for all Clean Air Act permits currently required for the operation of generating facilities.  Chugach is subject to numerous other environmental statutes including the Clean Water Act, the Resource Conservation and Recovery Act, the Toxic Substances Control Act, the Endangered Species Act, and the Comprehensive Environmental Response, Compensation and Liability Act and to the regulations implementing these statutes. Chugach does not believe that compliance with these statutes and regulations to date has had a material impact on its financial condition, results of operation or cash flows. However, the implementation of any additional new law or regulation, or the limitations thereof, or changes in or new interpretations of laws or regulations could result in significant additional capital or operating expenses. Chugach monitors proposed new regulations and existing regulation changes through industry associations and professional organizations. 

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2020
Commitments And Contingencies [Abstract]
Commitments And Contingencies	13. COMMITMENTS AND CONTINGENCIES  Contingencies  Chugach is a participant in various legal actions, rate disputes, personnel matters and claims both for and against Chugach’s interests. Management believes the outcome of any such matters will not materially impact Chugach’s financial condition, results of operations or liquidity. Chugach establishes reserves when a particular contingency is probable and calculable. Chugach has not accrued for any contingency at March 31, 2020, as it does not consider any contingency to be probable nor calculable. Chugach faces contingencies that are reasonably possible to occur; however, they cannot currently be estimated.  Concentrations  Approximately 70% of our employees are members of the IBEW. Chugach has three CBA’s with the IBEW. We also have a CBA with the HERE. All three IBEW CBA’s and the HERE CBA have been renewed through June 30, 20 21 .  Commitments  Fuel Supply Contracts  Chugach has fuel supply contracts with various producers at market terms. Chugach entered into a gas contract with Hilcorp effective January 1, 2015 , to provide gas through March 31, 2018 (the “Hilcorp Agreement”). After four amendments to the Hilcorp Agreement, Chugach has 100% of its needs filled through March 31, 2028 . The total amount of gas under this agreement is estimated to be 79.4 BCF. All of the production is expected to come from Cook Inlet, Alaska. The terms of the Hilcorp Agreement require Chugach to manage the natural gas transportation over the connecting pipeline systems. Chugach has gas transportation agreements with ENSTAR and Harvest Pipeline.  BRU Operations  At this time, Chugach and other owners, ML&P and Hilcorp, have chosen to continue operating under an existing Joint Operating Agreement. Hilcorp is the operator for BRU.  Patronage Capital  Pursuant to agreements reached with HEA and MEA, patronage capital retired to HEA and MEA is classified as patronage capital payable on Chugach’s consolidated balance sheet until paid. In April 2019, our Board authorized payments to HEA and MEA of $2.0 million and $6.1 million, respectively , therefore reducing patronage capital payable . At March 31, 2020, and December 31, 2019 , patronage capital payable to HEA was $1.9 million, with no patronage capital payable to MEA.  Legal Proceedings  Chugach has certain litigation matters and pending claims that arise in the ordinary course of Chugach’s business. In the opinion of management, none of these matters, individually or in the aggregate, is or are likely to have a material adverse effect on Chugach’s results of operations, financial condition or cash flows.

Significant Accounting Polici_2

Significant Accounting Policies (Policy)	3 Months Ended
	Mar. 31, 2020
Significant Accounting Policies [Abstract]
Management Estimates	a. Management Estimates  In preparing the financial statements in conformity with U.S. GAAP, the management of Chugach is required to make estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the balance sheet and revenues and expenses for the reporting period. Estimates include allowance for doubtful accounts, workers’ compensation liability, deferred charges and liabilities, unbilled revenue, estimated useful life of utility plant, cost of removal and asset retirement obligation (“ARO”), and remaining proven BRU reserves. Actual results could differ from those estimates.
Regulation	b. Regulation  The accounting records of Chugach conform to the Uniform System of Accounts as prescribed by the Federal Energy Regulatory Commission (“FERC”). Chugach meets the criteria, and accordingly, follows the accounting and reporting requirements of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 980, “Topic 980 - Regulated Operations.” FASB ASC 980 provides for the recognition of regulatory assets and liabilities as allowed by regulators for costs or credits that are reflected in current rates or are considered probable of being included in future rates. Chugach’s regulated rates are established to recover all of the specific costs of providing electric service. In each rate filing, rates are set at levels to recover all of the specific allowable costs and those rates are then collected from retail and wholesale customers. The regulatory assets or liabilities are then reduced as the cost or credit is reflected in earnings and our rates.
Income Taxes	c. Income Taxes  Chugach is exempt from federal income taxes under the provisions of Section 501(c)(12) of the Internal Revenue Code and for the three month periods ended March 31, 2020, and 2019, was in compliance with that provision.  Chugach applies a more-likely-than-not recognition threshold for all tax uncertainties. FASB ASC 740, “Topic 740 – Income Taxes,” only allows the recognition of those tax benefits that have a greater than 50% likelihood of being sustained upon examination by the taxing authorities. Chugach’s management reviewed Chugach’s tax positions and determined there were no outstanding or retroactive tax positions that were not highly certain of being sustained upon examination by the taxing authorities.
Cash, Cash Equivalents And Restricted Cash Equivalents	d. Cash, Cash Equivalents, and Restricted Cash Equivalents  The following table provides a reconciliation of cash, cash equivalents, and restricted cash equivalents reported within the Consolidated Balance Sheet that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows.     March 31, 2020 December 31, 2019  Cash and cash equivalents $ 5,280,739 $ 7,271,820  Restricted cash equivalents 500,376 1,244,155  Restricted cash equivalents included in other property and investments 64,310 108,000  Total cash, cash equivalents and restricted cash equivalents shown in the consolidated statements of cash flows $ 5,845,425 $ 8,623,975  Restricted cash equivalents include funds on deposit for future workers’ compensation claims. Restricted assets, including cash equivalents, are recognized on Chugach’s Consolidated Balance Sheet when they are restricted as to withdrawal or usage.
Marketable Securities	e. Marketable Securities  Chugach’s marketable securities consist of bond mutual funds, corporate bonds, and certificates of deposit with a maturity less than 12 months, classified as trading securities, reported at fair value with gains and losses in earnings. Interest and dividend income from marketable securities is included in nonoperating margins – interest income, and was $12.8 thousand and $62.9 thousand at March 31, 2020, and 2019, respectively. Net gains and losses on marketable securities are included in nonoperating margins – capital credits, patronage dividends and other, and are summarized as follows:     Three months ended March 31, 2020 Three months ended March 31, 2019  Net gains and (losses) recognized during the period on trading securities $ (16,520) $ 87,952  Less: Net gains and (losses) recognized during the period on trading securities sold during the period 0 0  Unrealized gains and (losses) recognized during the reporting period on trading securities still held at the reporting date $ (16,520) $ 87,952 
Accounts Receivable	f. Accounts Receivable  Included in accounts receivable are amounts invoiced to ML&P for their proportionate share of current Southcentral Power Project (“SPP”) costs, which amounted to $1.2 million and $ 1.0 million at March 31, 2020, and December 31, 2019, respectively.
Fuel Stock	g. Fuel Stock  Fuel stock is the weighted average cost of fuel injected into Cook Inlet Natural Gas Storage, LLC (“CINGSA”). Chugach’s fuel balance in storage amounted to $8.7 million and $12.3 million at March 31, 2020, and December 31, 2019, respectively. 
Investments In Associated Organizations	h. Investments in Associated Organizations  Chugach’s investments in associated organizations are considered equity securities without readily determinable fair values, and as such are measured at cost minus impairment, if any. There were no impairments of these investments recognized during the three months ended March 31 , 20 20 , or 201 9 .

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2020
Significant Accounting Policies [Abstract]
Reconciliation Of Cash, Cash Equivalents, And Restricted Cash Equivalents	   March 31, 2020 December 31, 2019  Cash and cash equivalents $ 5,280,739 $ 7,271,820  Restricted cash equivalents 500,376 1,244,155  Restricted cash equivalents included in other property and investments 64,310 108,000  Total cash, cash equivalents and restricted cash equivalents shown in the consolidated statements of cash flows $ 5,845,425 $ 8,623,975 
Schedule Of Gains And Losses On Trading Securities	   Three months ended March 31, 2020 Three months ended March 31, 2019  Net gains and (losses) recognized during the period on trading securities $ (16,520) $ 87,952  Less: Net gains and (losses) recognized during the period on trading securities sold during the period 0 0  Unrealized gains and (losses) recognized during the reporting period on trading securities still held at the reporting date $ (16,520) $ 87,952 

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Tables)	3 Months Ended
	Mar. 31, 2020
Revenue From Contracts With Customers [Abstract]
Schedule Of Disaggregation Of Revenue	   Base Rate Sales Revenue Fuel and Purchased Power Revenue Total Revenue  2020 2019 % Variance 2020 2019 % Variance 2020 2019 % Variance  Retail $ 37.1 $ 33.1 12.1 % $ 19.7 $ 19.9 (1.0 %) $ 56.8 $ 53.0 7.2 %  Wholesale $ 0.7 $ 0.5 40.0 % $ 0.9 $ 0.9 0.0 % $ 1.6 $ 1.4 14.3 %  Economy $ 0.0 $ 0.0 0.0 % $ 0.0 $ 0.0 0.0 % $ 0.0 $ 0.0 0.0 %  Total Energy Sales $ 37.8 $ 33.6 12.5 % $ 20.6 $ 20.8 (1.0 %) $ 58.4 $ 54.4 7.4 %  Wheeling $ 0.0 $ 0.0 0.0 % $ 1.1 $ 0.8 37.5 % $ 1.1 $ 0.8 37.5 %  Other $ 0.4 $ 0.6 (33.3 %) $ 0.0 $ 0.0 0.0 % $ 0.4 $ 0.6 (33.3 %)  Total Miscellaneous $ 0.4 $ 0.6 (33.3 %) $ 1.1 $ 0.8 37.5 % $ 1.5 $ 1.4 7.1 %  Total Revenue $ 38.2 $ 34.2 11.7 % $ 21.7 $ 21.6 0.5 % $ 59.9 $ 55.8 7.3 % 
Schedule Of Contract Balances	   March 31, 2020 December 31, 2019  Contract receivables, included in accounts receivable $ 26,754,403 $ 26,383,976  Contract asset 335,760 1,445,753  Contract liabilities 1,378,798 1,839,514 
Schedule Of Changes In Contract Balances	   March 31, 2020 December 31, 2019  Contract asset at beginning of period $ 1,445,753 $ 0  Cash received, excluding amounts recognized as revenue during the period 335,760 1,445,753  Revenue recognized and transferred from contract asset at the beginning of the period (1,445,753) 0  Contract asset at end of period $ 335,760 $ 1,445,753  Significant changes in contract liabilities balances are as follows:      March 31, 2020 December 31, 2019  Contract liabilities at beginning of period $ 1,839,514 $ 5,196,426  Cash received, excluding amounts recognized as revenue during the period 918,670 1,839,514  Revenue recognized and transferred from contract liabilities at the beginning of the period (1,379,386) (5,196,426)  Contract liabilities at end of period $ 1,378,798 $ 1,839,514 
Schedule Of Remaining Performance Obligation	   2020  Credit balances $ 1,378,798 

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2020
Debt [Abstract]
Schedule Of Average Commercial Paper Balances Outstanding And Weighted Average Interest Rates	   2020 2019  Average Balance Weighted Average Interest Rate Average Balance Weighted Average Interest Rate  $ 15.5 1.79 % $ 61.8 2.78 % 
Schedule Of Debt Issuance Costs Associated With Long-Term Obligations	The following table outlines debt issuance costs associated with long-term obligations, excluding current installments, at March 31 , 20 20 .    Long-term Obligations Unamortized Debt Issuance Costs  2011 Series A Bonds $ 168,333,330 $ 953,940  2012 Series A Bonds 158,250,000 842,991  2017 Series A Bonds 32,000,000 175,786  2019 Series A Bonds 75,000,000 479,064  2016 CoBank Note 29,640,000 163,634  2020 Financing 0 19,834  $ 463,223,330 $ 2,635,249  The following table outlines debt issuance costs associated with long-term obligations, excluding current installments, at December 31, 201 9 .    Long-term Obligations Unamortized Debt Issuance Costs  2011 Series A Bonds $ 178,999,997 $ 981,692  2012 Series A Bonds 162,000,000 864,613  2017 Series A Bonds 34,000,000 178,410  2019 Series A Bonds 75,000,000 488,611  2016 CoBank Note 30,552,000 171,211  $ 480,551,997 $ 2,684,537 

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Supplemental Cash Flow Information	   Three months ended March 31, 2020 Three months ended March 31, 2019  Cash paid for amounts included in the measurement of liabilities:  Operating cash flows from operating leases $ 64,141 $ 54,000  Right-of-use assets obtained in exchange for lease obligations:  Operating leases $ 10,473 $ 934,371 
Supplemental Balance Sheet Information	   March 31, 2020 December 31, 2019  Operating lease right-of-use assets $ 915,237 $ 958,111  Operating lease liabilities 698,668 738,713  Current installments of lease liabilities 216,569 219,398  Total operating lease liabilities $ 915,237 $ 958,111 
Maturities Associated With Lease Liabilities	   March 31, 2020  2020 $ 199,744  2021 227,429  2022 227,429  2023 227,429  2024 11,429  Thereafter 165,036  Total lease payments 1,058,496  Less imputed interest 143,259  Present value of lease liabilities $ 915,237 

Fair Values Of Assets And Lia_2

Fair Values Of Assets And Liabilities (Tables)	3 Months Ended
	Mar. 31, 2020
Fair Values Of Assets And Liabilities [Abstract]
Schedule Of Marketable Securities	   March 31, 2020 Total Level 1 Level 2 Level 3  Bond mutual funds $ 179,327 $ 179,327 $ 0 $ 0   December 31, 2019 Total Level 1 Level 2 Level 3  Bond mutual funds $ 194,183 $ 194,183 $ 0 $ 0 
Schedule Of Estimated Fair Value Of Long-Term Obligations Included In Financial Statements	   Carrying Value Fair Value Level 2  Long-term obligations (including current installments) $ 483,174 $ 512,840 

Description Of Business (Narrat

Description Of Business (Narrative) (Details)	3 Months Ended
	Mar. 31, 2020miagreement
Description Of Business [Line Items]
Electrification area | mi	400
Hotel Employees And Restaurant Employees [Member]
Description Of Business [Line Items]
Number of collective bargaining agreements	1
Expiration date of collective bargaining agreements	Jun. 30, 2021
International Brotherhood of Electrical Workers [Member]
Description Of Business [Line Items]
Number of collective bargaining agreements	3
Percentage of employees belonging to unions	70.00%
Expiration date of collective bargaining agreements	Jun. 30, 2021

Significant Accounting Polici_4

Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Interest income	$ 12,800	$ 62,900
Accounts receivable	29,383,709		$ 30,120,230
Fuel stock	8,673,038		12,250,567
Impairment on investments	0	$ 0
ML&P For Fuel And South Central Power Project Costs [Member]
Significant Accounting Policies [Line Items]
Accounts receivable	$ 1,200,000		$ 1,000,000

Significant Accounting Polici_5

Significant Accounting Policies (Reconciliation Of Cash, Cash Equivalents, And Restricted Cash Equivalents) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Significant Accounting Policies [Abstract]
Cash and cash equivalents	$ 5,280,739	$ 7,271,820
Restricted cash equivalents	500,376	1,244,155
Restricted cash equivalents included in other property and investments	64,310	108,000
Total cash, cash equivalents and restricted cash equivalents shown in the consolidated statements of cash flows	$ 5,845,425	$ 8,623,975	$ 5,899,088	$ 7,428,969

Significant Accounting Polici_6

Significant Accounting Policies (Schedule Of Gains And Losses On Trading Securities) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Significant Accounting Policies [Abstract]
Net gains and (losses) recognized during the period on trading securities	$ (16,520)	$ 87,952
Less: Net gains and (losses) recognized during the period on trading securities sold during the period	0	0
Unrealized gains and (losses) recognized during the reporting period on trading securities still held at the reporting date	$ (16,520)	$ 87,952

Revenue From Contracts With C_3

Revenue From Contracts With Customers (Narrative) (Details)	3 Months Ended
	Mar. 31, 2020USD ($)item	Mar. 31, 2019USD ($)
Disaggregation of Revenue [Line Items]
Contract cost | $	$ 0
Energy Sales [Member]
Disaggregation of Revenue [Line Items]
Unbilled revenue | $	$ 9,634,896	$ 7,996,257
Energy Sales [Member] | Minimum [Member]
Disaggregation of Revenue [Line Items]
Payment terms	15 days
Energy Sales [Member] | Maximum [Member]
Disaggregation of Revenue [Line Items]
Payment terms	30 days
Energy Sales [Member] | Sales Revenue [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration percentage	97.50%	97.50%
Energy Sales [Member] | Sales Revenue [Member] | Credit Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration percentage	0.10%
Retail [Member]
Disaggregation of Revenue [Line Items]
Number of components of monthly billing	4
Wholesale [Member]
Disaggregation of Revenue [Line Items]
Number of components of monthly billing	4
Economy [Member]
Disaggregation of Revenue [Line Items]
Number of components of monthly billing	3
Wheeling [Member] | Sales Revenue [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration percentage	1.70%	1.40%
Other Miscellaneous [Member] | Sales Revenue [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration percentage	0.80%	1.10%

Revenue From Contracts With C_4

Revenue From Contracts With Customers (Schedule Of Disaggregation Of Revenue) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 59,907,423	$ 55,827,238
Variance percent	7.30%
Energy Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 58,400,000	54,400,000
Variance percent	7.40%
Retail [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 56,800,000	53,000,000
Variance percent	7.20%
Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 1,600,000	1,400,000
Variance percent	14.30%
Economy [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 0	0
Variance percent	0.00%
Miscellaneous Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 1,500,000	1,400,000
Variance percent	7.10%
Wheeling [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 1,100,000	800,000
Variance percent	37.50%
Other Miscellaneous [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 400,000	600,000
Variance percent	(33.30%)
Base Rate Sales Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 38,200,000	34,200,000
Variance percent	11.70%
Base Rate Sales Revenue [Member] | Energy Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 37,800,000	33,600,000
Variance percent	12.50%
Base Rate Sales Revenue [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 37,100,000	33,100,000
Variance percent	12.10%
Base Rate Sales Revenue [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 700,000	500,000
Variance percent	40.00%
Base Rate Sales Revenue [Member] | Economy [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 0	0
Variance percent	0.00%
Base Rate Sales Revenue [Member] | Miscellaneous Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 400,000	600,000
Variance percent	(33.30%)
Base Rate Sales Revenue [Member] | Wheeling [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 0	0
Variance percent	0.00%
Base Rate Sales Revenue [Member] | Other Miscellaneous [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 400,000	600,000
Variance percent	(33.30%)
Fuel And Purchased Power Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 21,700,000	21,600,000
Variance percent	0.50%
Fuel And Purchased Power Revenue [Member] | Energy Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 20,600,000	20,800,000
Variance percent	(1.00%)
Fuel And Purchased Power Revenue [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 19,700,000	19,900,000
Variance percent	(1.00%)
Fuel And Purchased Power Revenue [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 900,000	900,000
Variance percent	0.00%
Fuel And Purchased Power Revenue [Member] | Economy [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 0	0
Variance percent	0.00%
Fuel And Purchased Power Revenue [Member] | Miscellaneous Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 1,100,000	800,000
Variance percent	37.50%
Fuel And Purchased Power Revenue [Member] | Wheeling [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 1,100,000	800,000
Variance percent	37.50%
Fuel And Purchased Power Revenue [Member] | Other Miscellaneous [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0
Variance percent	0.00%

Revenue From Contracts With C_5

Revenue From Contracts With Customers (Schedule Of Contract Balances) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue From Contracts With Customers [Abstract]
Contract receivables, included in accounts receivable	$ 26,754,403	$ 26,383,976
Contract asset	335,760	1,445,753	$ 0
Contract liabilities	$ 1,378,798	$ 1,839,514	$ 5,196,426

Revenue From Contracts With C_6

Revenue From Contracts With Customers (Schedule Of Changes In Contract Balances) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Revenue From Contracts With Customers [Abstract]
Contract asset at beginning of period	$ 1,445,753	$ 0
Cash received, excluding amounts recognized as revenue during the period	335,760	1,445,753
Revenue recognized and transferred from contract asset at the beginning of the period	(1,445,753)	0
Contract asset at end of period	335,760	1,445,753
Contract liabilities at beginning of period	1,839,514	5,196,426
Cash received, excluding amounts recognized as revenue during the period	918,670	1,839,514
Revenue recognized and transferred from contract liabilities at the beginning of the period	(1,379,386)	(5,196,426)
Contract liabilities at end of period	$ 1,378,798	$ 1,839,514

Revenue From Contracts With C_7

Revenue From Contracts With Customers (Schedule Of Remaining Performance Obligation) (Details)	Mar. 31, 2020USD ($)
Credit Balances [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,378,798

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Details) $ in Millions	May 13, 2020	Apr. 30, 2020	Mar. 31, 2020USD ($)entityMW	Jan. 31, 2020	Dec. 31, 2019USD ($)	Dec. 31, 2018
Other Commitments [Line Items]
Approved percentage increase (decrease) in rates		0.40%		3.80%
Number of utilities participating in RRC | entity			6
Rate Increases Within 12 Months [Member]
Other Commitments [Line Items]
Rate increase threshold			8.00%
Rate Increases Within 36 Months [Member]
Other Commitments [Line Items]
Rate increase threshold			20.00%
Subsequent Event [Member]
Other Commitments [Line Items]
Approved percentage increase (decrease) in rates	1.10%
ML&P Acquisition [Member]
Other Commitments [Line Items]
Percentage of voters in favor of acquisition						65.08%
Percentage of voters against acquisition						34.92%
Net book value of purchased assets threshhold triggering upward price adjustments					$ 715.4
Amendment No. 3 to Asset Purchase Agreement [Member]
Other Commitments [Line Items]
Reduction of upfront payment to MOA					10
Net book value of purchased assets threshhold triggering upward price adjustments					0
Rate reduction account, funded by local government, benefiting legacy customers					$ 36
GVEA Memorandum of Understanding [Member] | ML&P Acquisition [Member]
Other Commitments [Line Items]
Term of services agreement			3 years
Available power supply | MW			5
Term of power supply agreement			5 years
Revenue			$ 10

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Commercial paper	$ 0	$ 24,000,000
Unsecured credit facility	41,000,000	0
Balance outstanding	$ 463,223,330	480,551,997
Commercial Paper [Member]
Debt Instrument [Line Items]
Interest rate	1.85%
Commercial Paper [Member] | Minimum [Member]
Debt Instrument [Line Items]
Commercial paper repricing term	1 day
Commercial Paper [Member] | Maximum [Member]
Debt Instrument [Line Items]
Commercial paper repricing term	397 days
Revolving Line Of Credit [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity	$ 50,000,000
Line of credit borrowings	41,000,000
Line of credit repayments	41,000,000
Line of credit, outstanding balance	$ 0	$ 0
Line of credit, borrowing rate description	The borrowing rate is calculated using the total rate per annum and may be fixed by NRUCFC, and
Line of credit, borrowing rate	3.25%	3.25%
Period of time the line of credit needs to be paid down for five consecutive days	12 months
Number of consecutive days debt needs to be paid down to $0 during a twelve month period	5 days
Line of credit, expiration date	Sep. 29, 2022
Credit Agreement [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity	$ 800,000,000
Debt term	18 months
Credit Agreement [Member] | Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity	$ 150,000,000
Line of credit, borrowing rate description	one month London Interbank Offered Rate ("LIBOR") plus 90.0 basis points, along with a 10.0 basis points facility fee (based on an A/A2/A unsecured debt rating)
Line of credit, commencement date	Jun. 13, 2016
Line of credit, expiration date	Jun. 13, 2021
Facility fee	0.10%
Credit Agreement [Member] | Unsecured Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Variable rate	0.90%
First Amendment to the Credit Agreement [Member] | Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity	$ 300,000,000
Line of credit, commencement date	Jul. 30, 2019
Line of credit, expiration date	Jul. 30, 2024
2011 Series A Bonds [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Balance outstanding	$ 168,333,330	$ 178,999,997
2012 Series A Bonds [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Balance outstanding	$ 158,250,000	162,000,000
2016 CoBank Note [Member]
Debt Instrument [Line Items]
Line of credit, commencement date	Jun. 30, 2016
Balance outstanding	$ 33,200,000
2016 CoBank Note [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Balance outstanding	29,640,000	30,552,000
2017 Series A Bonds [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Balance outstanding	32,000,000	34,000,000
2019 Series A Bonds [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Bonds issuance amount	$ 75,000,000
Bonds commencement payment date	Nov. 15, 2019
Maturity date	May 15, 2049
Interest rate	3.86%
Note commencement date	May 15, 2019
Average life	12 years
Balance outstanding	$ 75,000,000	$ 75,000,000

Debt (Schedule Of Average Comme

Debt (Schedule Of Average Commercial Paper Balances Outstanding And Weighted Average Interest Rates) (Details) - Commercial Paper [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Short-term Debt [Line Items]
Average Balance	$ 15.5	$ 61.8
Weighted Average Interest Rate	1.79%	2.78%

Debt (Schedule Of Debt Issuance

Debt (Schedule Of Debt Issuance Costs Associated With Long-Term Obligations) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Obligations	$ 463,223,330	$ 480,551,997
Unnamortized Debt Issuance Costs	2,635,249	2,684,537
2011 Series A Bonds [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Obligations	168,333,330	178,999,997
Unnamortized Debt Issuance Costs	953,940	981,692
2012 Series A Bonds [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Obligations	158,250,000	162,000,000
Unnamortized Debt Issuance Costs	842,991	864,613
2017 Series A Bonds [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Obligations	32,000,000	34,000,000
Unnamortized Debt Issuance Costs	175,786	178,410
2019 Series A Bonds [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Obligations	75,000,000	75,000,000
Unnamortized Debt Issuance Costs	479,064	488,611
2016 CoBank Note [Member]
Debt Instrument [Line Items]
Long-term Obligations	33,200,000
2016 CoBank Note [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Obligations	29,640,000	30,552,000
Unnamortized Debt Issuance Costs	163,634	$ 171,211
2020 Financing [Member]
Debt Instrument [Line Items]
Long-term Obligations	0
Unnamortized Debt Issuance Costs	$ 19,834

Leases (Narrative) (Details)

Leases (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)agreement	Dec. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Number of leases | agreement	5
Weighted average remaining lease term	6 years 6 months 15 days
Discount rate	4.29%
Operating lease cost	$ 66,391
Percent of control of leased asset	100.00%
Variable payments	$ 1,243,198	$ 1,242,432
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lease term	23 years 6 months
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lease term	1 month

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow Information) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 64,141	$ 54,000
Operating leases	$ 10,473	$ 934,371

Leases (Supplemental Balance Sh

Leases (Supplemental Balance Sheet Information) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 915,237	$ 958,111
Operating lease liabilities	698,668	738,713
Current installments of lease liabilities	216,569	219,398
Total operating lease liabilities	$ 915,237	$ 958,111

Leases (Maturities Associated W

Leases (Maturities Associated With Lease Liabilities) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
2020	$ 199,744
2021	227,429
2022	227,429
2023	227,429
2024	11,429
Thereafter	165,036
Total lease payments	1,058,496
Less imputed interest	143,259
Present value of lease liabilities	$ 915,237	$ 958,111

Fair Values Of Assets And Lia_3

Fair Values Of Assets And Liabilities (Narrative) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, liabilities	$ 0	$ 0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, liabilities	0	0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, assets	0	0
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, assets	$ 0	$ 0

Fair Values Of Assets And Lia_4

Fair Values Of Assets And Liabilities (Schedule Of Marketable Securities) (Details) - Bond Mutual Funds [Member] - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 179,327	$ 194,183
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	179,327	194,183
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 0	$ 0

Fair Values Of Assets And Lia_5

Fair Values Of Assets And Liabilities (Schedule Of Estimated Fair Value Of Long-Term Obligations Included In Financial Statements) (Details) $ in Thousands	Mar. 31, 2020USD ($)
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term obligations (including current installments)	$ 483,174
Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term obligations (including current installments)	$ 512,840

ML&P Acquisition (Narrative) (D

ML&P Acquisition (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)MW	Dec. 31, 2019USD ($)	Dec. 31, 2018
Eklutna Power Purchase Agreement [Member]
Business Acquisition [Line Items]
Term of purchase commitment	35 years
ML&P Acquisition [Member]
Business Acquisition [Line Items]
Percentage of voters in favor of acquisition			65.08%
Percentage of voters against acquisition			34.92%
Term to set closing date after approval	120 days
Cash consideration	$ 767.8
Payment in lieu of taxes, agreement period	50 years
Net book value of purchased assets threshhold triggering upward price adjustments		$ 715.4
ML&P Acquisition [Member] | GVEA Memorandum of Understanding [Member]
Business Acquisition [Line Items]
Term of services agreement	3 years
Available power supply | MW	5
Term of power supply agreement	5 years
Revenue	$ 10
Amendment No. 3 to Asset Purchase Agreement [Member]
Business Acquisition [Line Items]
Reduction of upfront payment to MOA		10
Net book value of purchased assets threshhold triggering upward price adjustments		0
Rate reduction account, funded by local government, benefiting legacy customers		$ 36

Beluga River Unit (Narrative) (

Beluga River Unit (Narrative) (Details) - Beluga River Unit [Member] $ in Thousands, Mcf in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)miMcf	Dec. 31, 2019Mcf	Dec. 31, 2013USD ($)
Business Acquisition [Line Items]
Number of miles from Anchorage | mi	35
Working interest ownership percentage	10.00%
Lifted amount of gas during the period | Mcf		0.9
Lifted amount of gas in proven developed reserves | Mcf	6.3
Estimated production tax liability, term	10 years
Fuel reserve study, preiod between estimates	3 years
Asset retirement obligation, period between estimates	5 years
ARO estimate | $	$ 56,900		$ 33,500
ARO estimate by working interest | $	$ 5,690		$ 3,350
Gas reserves | Mcf	19.6
Change in prior estimates | Mcf	3
Natural Gas, Production, Above Ground Assets [Member]
Business Acquisition [Line Items]
ARO estimate | $	$ 28,500
Natural Gas, Production, Below Ground Assets [Member]
Business Acquisition [Line Items]
ARO estimate | $	$ 28,400
Municipal Light & Power [Member]
Business Acquisition [Line Items]
Working interest ownership percentage	56.70%
Hilcorp Alaska, LLC [Member]
Business Acquisition [Line Items]
Working interest ownership percentage	33.30%

Environmental Matters (Narrativ

Environmental Matters (Narrative) (Details)	3 Months Ended
	Mar. 31, 2020entity
Environmental Matters [Abstract]
Number of utility owners participating in project	3
Term to complete environmental program	35 years
Percentage of water inflows utilized	100.00%

Commitments And Contingencies (

Commitments And Contingencies (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)agreementMcf	Dec. 31, 2019USD ($)
Other Commitments [Line Items]
Contingency accruals	$ 0
Matanuska Electric Association, Inc. [Member]
Other Commitments [Line Items]
Payments to retire patronage capital		$ 6,100,000
Patronage capital payable	0	0
Homer Electric Association, Inc. [Member]
Other Commitments [Line Items]
Payments to retire patronage capital		2,000,000
Patronage capital payable	$ 1,900,000	$ 1,900,000
Hilcorp Alaska - Cook Inlet [Member]
Other Commitments [Line Items]
Commencement date of long term contract for purchase of gas supply	Jan. 1, 2015
Expiration date of long term contract for purchase of gas supply	Mar. 31, 2018
Estimated amount of gas under contract | Mcf	79,400,000
Percentage Of Met Natural Gas Needs	100.00%
Number of contract extensions | agreement	4
Initial extension date of long term contract for purchase of gas supply	Mar. 31, 2028
International Brotherhood of Electrical Workers [Member]
Other Commitments [Line Items]
Percentage of employees belonging to unions	70.00%
Number of collective bargaining agreements | agreement	3
Expiration date of collective bargaining agreements	Jun. 30, 2021
Hotel Employees And Restaurant Employees [Member]
Other Commitments [Line Items]
Number of collective bargaining agreements | agreement	1
Expiration date of collective bargaining agreements	Jun. 30, 2021