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SEGMENTS OF BUSINESS - Key Metrics Reviewed (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
SEGMENTS OF BUSINESS
Fuel	$ (27,119)	$ (13,755)	$ (57,392)	$ (34,684)
Other Operating and Maintenance Costs	(44,415)	(32,741)	(101,759)	(103,704)
Cost of Purchased Power	(2,074)	(3,149)	(11,086)	(7,694)
Utilities	(4,543)	(3,586)	(13,202)	(12,090)
Labor	(27,574)	(26,721)	(81,402)	(88,444)
Delivered Energy
SEGMENTS OF BUSINESS
Revenues	77,776	56,256	194,044	148,490
Capacity Revenue
SEGMENTS OF BUSINESS
Revenues	15,459	15,860	45,110	44,506
Electric sales
SEGMENTS OF BUSINESS
Revenues	93,235	72,116	239,154	192,996
EBITDA Margin	44,117	41,083	115,993	102,813
Coal Sales
SEGMENTS OF BUSINESS
Revenues	51,256	31,662	119,588	114,093
EBITDA Margin	(8,721)	(20,478)	(32,354)	(53,775)
Electric Operations
SEGMENTS OF BUSINESS
Revenues	93,235	72,116	239,154	192,996
Electric Operations | Delivered Energy
SEGMENTS OF BUSINESS
Revenues	77,776	56,256	194,044	148,490
Electric Operations | Capacity Revenue
SEGMENTS OF BUSINESS
Revenues	15,459	15,860	45,110	44,506
Electric Operations | Operating Segment
SEGMENTS OF BUSINESS
Fuel	(44,751)	(30,181)	(104,150)	(79,532)
Other Operating Costs	(1)	(36)	(10)	(22)
Total Variable Costs	(44,752)	(30,217)	(104,160)	(79,554)
Other Operating and Maintenance Costs	(9,368)	(5,561)	(24,602)	(22,926)
Cost of Purchased Power	(2,074)	(3,149)	(11,086)	(7,694)
Utilities	(1,873)	(492)	(3,932)	(1,451)
Labor	(7,949)	(7,360)	(23,731)	(22,203)
Margin Without General And Administrative	27,219	25,337	71,643	59,168
General and administrative	(1,308)	(1,252)	(3,972)	(3,760)
EBITDA Margin	25,911	24,085	67,671	55,408
Electric Operations | Operating Segment | Delivered Energy
SEGMENTS OF BUSINESS
Revenues	77,776	56,256	194,044	148,490
Electric Operations | Operating Segment | Capacity Revenue
SEGMENTS OF BUSINESS
Revenues	15,459	15,860	45,110	44,506
Electric Operations | Operating Segment | Electric sales
SEGMENTS OF BUSINESS
Revenues	93,235	72,116	239,154	192,996
EBITDA Margin	25,911	24,085	67,671	55,408
Coal Operations
SEGMENTS OF BUSINESS
Revenues	51,256	31,662	119,588	114,093
Coal Operations | Operating Segment
SEGMENTS OF BUSINESS
Fuel	(574)	(572)	(1,564)	(2,557)
Other Operating and Maintenance Costs	(35,046)	(27,031)	(77,147)	(80,419)
Utilities	(2,670)	(3,094)	(9,270)	(10,639)
Labor	(19,625)	(19,361)	(57,671)	(66,241)
Margin Without General And Administrative	10,899	(1,738)	23,465	210
General and administrative	(2,062)	(2,082)	(6,290)	(8,012)
EBITDA Margin	8,837	(3,820)	17,175	(7,802)
Coal Operations | Operating Segment | Coal Sales
SEGMENTS OF BUSINESS
Revenues	68,814	48,320	169,117	160,066
EBITDA Margin	$ 8,837	$ (3,820)	$ 17,175	$ (7,802)

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