COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Sep. 30, 2020 USD ($) dth	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Product Liability Contingency [Line Items]
Environmental trust liability		$ 26,174	$ 27,400
Environmental liability related to landfill, period		30 years
Annual inflation rate on environmental liability related to landfill		3.00%
Purchase commitment, energy volume required per day (in dekatherm) | dth	15,000,000
Purchase commitment per month	$ 200
Purchase commitment, termination notice period	12 months
Purchase commitment period	10 years
Coal Ash Impoundment
Product Liability Contingency [Line Items]
Environmental liability		$ 17,500	17,500
Environmental trust liability		$ 10,500	$ 10,500