COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) dth	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]		Environmental liabilities
Environmental liabilities		$ 29,866	$ 27,400
Environmental liability related to landfill, period		30 years
Annual inflation rate on environmental liability related to landfill		2.40%
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
Loss Contingencies [Line Items]
Environmental liability		$ 17,300	17,500
Environmental liabilities		12,900	10,500
Coal ash impoundment | Selling, General and Administrative Expenses
Loss Contingencies [Line Items]
Environmental obligations		$ 2,400	$ 1,900