REGULATORY LIABILITIES - Regulatory Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Dec. 31, 2017
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 29,664	$ 30,267	$ 22,800
Utility Plant Retirement Cost Obligation [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities	325	279
Deferred Settlement Refunds [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities	2,496	2,496
Deferred Income Taxes [Member]
Regulatory Liabilities [Abstract]
Regulatory liabilities	$ 26,843	$ 27,492