REGULATORY ASSETS AND LIABILTIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory balancing accounts	$ 66,826	$ 78,597
Regulatory balancing accounts	$ 12,240	$ 32,908
Return on equity	9.20%
Approved debt	5.51%
Approved equity	53.40%
Approved equity to debt ratio	46.60%
Proposed return on equity	10.35%
Requested debt	4.23%
Requested equity	53.40%
Requested equity to debt ratio	46.60%
Decrease on annual revenue	$ (11,000)
California Public Advocates Office
Schedule of Regulatory Assets and Liabilities [Line Items]
Recommended return on equity	7.81%
Recommended debt	4.23%
Recommended equity	49.40%
Recommended equity to debt ratio	50.60%