v3.24.0.1
REGULATORY MATTERS (Cost Recovery Mechanisms) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2024
May 31, 2023
Dec. 31, 2025
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2022
Regulatory Assets (Liabilities)              
Environmental compliance adjustor, as a percentage of total retail revenue       0.50%      
Effective 1/1/24 to 12/31/26              
Regulatory Assets (Liabilities)              
Energy efficiency implementation plan term       3 years      
Purchased Power and Fuel Adjustment Clause              
Regulatory Assets (Liabilities)              
PPFAC Balance $ 55,000,000     $ 124,000,000 $ 91,000,000    
Deferred Fuel and Purchased Power Costs       328,000,000 348,000,000    
PPFAC and Base Power Recoveries       (397,000,000) (315,000,000)    
PPFAC Balances       $ 55,000,000 $ 124,000,000 $ 91,000,000  
Renewable Energy Standard              
Regulatory Assets (Liabilities)              
Renewable energy required percentage       13.00%      
Approved spending budget           $ 66,000,000  
Renewable energy actual percentage       22.00%      
Renewable Energy Standard | Forecast              
Regulatory Assets (Liabilities)              
Renewable energy target percentage     15.00%        
Distributed generation requirement target percentage (in percentage)     30.00%        
Purchased Power and Fuel Adjustment Clause              
Public Utilities, General Disclosures [Line Items]              
Months approved rate in effect unless modified       12 months      
Period of recovery of uncollected true up balance approved   12 months     18 months    
Forward looking component of PPFAC rate approved         $ 0    
Energy Efficiency Standards              
Regulatory Assets (Liabilities)              
Percentage of cumulative annual retail kilowatt savings, actual (percentage)       27.00%      
Annual energy efficiency target, percentage             1.30%
Energy Efficiency Standards | Effective 1/1/24 to 12/31/26              
Regulatory Assets (Liabilities)              
Approved recovery of spending budget       $ 72,000,000      
Energy Efficiency Standards | Forecast | Effective 1/1/24 to 12/31/26              
Regulatory Assets (Liabilities)              
Approval to refund an over-collected balance $ 10,000,000            
Period of refund for over-collected balance 1 year            
Lost Fixed Cost Recovery              
Regulatory Assets (Liabilities)              
Cap on increase in lost fixed cost recovery rate (percentage)       2.00%