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SEGMENTS OF BUSINESS - Revenuer Reconciliation (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
Other Operating Revenue	$ 2,355	$ 1,377	$ 8,780	$ 3,685
Total sales and operating revenues	146,846	105,155	367,522	310,774
Delivered Energy
SEGMENTS OF BUSINESS
Operating Revenues	77,776	56,256	194,044	148,490
Capacity Revenue
SEGMENTS OF BUSINESS
Operating Revenues	15,459	15,860	45,110	44,506
Coal Sales
SEGMENTS OF BUSINESS
Operating Revenues	51,256	31,662	119,588	114,093
Coal Sales | Third-Party
SEGMENTS OF BUSINESS
Operating Revenues	51,256	31,662	119,588	114,093
Electric Operations
SEGMENTS OF BUSINESS
Operating Revenues	93,235	72,116	239,154	192,996
Electric Operations | Delivered Energy
SEGMENTS OF BUSINESS
Operating Revenues	77,776	56,256	194,044	148,490
Electric Operations | Capacity Revenue
SEGMENTS OF BUSINESS
Operating Revenues	15,459	15,860	45,110	44,506
Coal Operations
SEGMENTS OF BUSINESS
Operating Revenues	51,256	31,662	119,588	114,093
Operating Segment | Electric Operations
SEGMENTS OF BUSINESS
Other Operating Revenue	192	187	3,413	518
Total sales and operating revenues	93,427	72,303	242,567	193,514
Operating Segment | Electric Operations | Delivered Energy
SEGMENTS OF BUSINESS
Operating Revenues	77,776	56,256	194,044	148,490
Operating Segment | Electric Operations | Capacity Revenue
SEGMENTS OF BUSINESS
Operating Revenues	15,459	15,860	45,110	44,506
Operating Segment | Coal Operations
SEGMENTS OF BUSINESS
Other Operating Revenue	1,647	721	4,370	2,028
Total sales and operating revenues	70,461	49,041	173,487	162,094
Operating Segment | Coal Operations | Coal Sales
SEGMENTS OF BUSINESS
Operating Revenues	68,814	48,320	169,117	160,066
Operating Segment | Coal Operations | Coal Sales | Third-Party
SEGMENTS OF BUSINESS
Operating Revenues	51,256	31,662	119,588	114,093
Operating Segment | Coal Operations | Coal Sales | Intercompany
SEGMENTS OF BUSINESS
Operating Revenues	17,558	16,658	49,529	45,973
Corporate and Other Eliminations
SEGMENTS OF BUSINESS
Other Operating Revenue	516	469	997	1,139
Total sales and operating revenues	(17,042)	(16,189)	(48,532)	(44,834)
Corporate and Other Eliminations | Coal Sales | Intercompany
SEGMENTS OF BUSINESS
Operating Revenues	$ (17,558)	$ (16,658)	$ (49,529)	$ (45,973)

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