NATURE OF OPERATIONS (Details)	12 Months Ended
	Dec. 31, 2023 a power_generation_facility segment MW
Disaggregation of Revenue [Line Items]
Number of coal refuse power generation facilities owned and operating | power_generation_facility	2
Number of operating segments | segment	2
Customized Energy Solutions, Ltd
Disaggregation of Revenue [Line Items]
Contract with supplier, term	2 years
Contract with supplier, termination notice before automatic renewal, period	60 days
Reclamation Facility, Venango County, Pennsylvania
Disaggregation of Revenue [Line Items]
Area of land (in acres) | a	650
Scrubgrass Plant
Disaggregation of Revenue [Line Items]
Generation capacity, electricity (in megawatts)	83.5
Panther Creek Plant
Disaggregation of Revenue [Line Items]
Generation capacity, electricity (in megawatts)	80