FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Schedule of Financial Instruments Measured at Fair Value on Recurring Basis) (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Assets
Restricted Cash	$ 28,000,000	$ 30,000,000
Energy Derivative Contracts, Regulatory Recovery	23,000,000	28,000,000
Energy Derivative Contracts, No Regulatory Recovery	16,000,000	2,000,000
Total Assets	67,000,000	60,000,000
Liabilities
Energy Derivative Contracts, Regulatory Recovery	(59,000,000)	(33,000,000)
Energy Derivative Contracts, No Regulatory Recovery	(1,000,000)
Total Liabilities	(60,000,000)	(33,000,000)
Total Assets (Liabilities), Net	7,000,000	27,000,000
Level 3
Liabilities
Total Assets (Liabilities), Net	0
Level 1
Assets
Restricted Cash	28,000,000	30,000,000
Energy Derivative Contracts, Regulatory Recovery	0	0
Energy Derivative Contracts, No Regulatory Recovery	0	0
Total Assets	28,000,000	30,000,000
Liabilities
Energy Derivative Contracts, Regulatory Recovery	0	0
Energy Derivative Contracts, No Regulatory Recovery	0
Total Liabilities	0	0
Total Assets (Liabilities), Net	28,000,000	30,000,000
Level 2
Assets
Restricted Cash	0	0
Energy Derivative Contracts, Regulatory Recovery	23,000,000	28,000,000
Energy Derivative Contracts, No Regulatory Recovery	16,000,000	2,000,000
Total Assets	39,000,000	30,000,000
Liabilities
Energy Derivative Contracts, Regulatory Recovery	(59,000,000)	(33,000,000)
Energy Derivative Contracts, No Regulatory Recovery	(1,000,000)
Total Liabilities	(60,000,000)	(33,000,000)
Total Assets (Liabilities), Net	$ (21,000,000)	$ (3,000,000)