v3.26.1
Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - IURC - Duke Energy Indiana
$ in Millions
1 Months Ended
Nov. 25, 2025
Feb. 13, 2025
USD ($)
MW
Jan. 29, 2025
USD ($)
Dec. 31, 2024
USD ($)
Apr. 04, 2024
USD ($)
Sep. 20, 2023
Indiana Coal Ash Recovery            
Public Utilities, General Disclosures [Line Items]            
Interest rate on refunds (as a percent)           4.71%
2024 Indiana Rate Case            
Public Utilities, General Disclosures [Line Items]            
Future investment in infrastructure         $ 1,600  
Increase in regulatory liability       $ 29    
Approved return on equity percentage (as a percent)     9.75%      
Equity ratio (as a percent)     53.00%      
Approved rate increase (decrease), amount     $ 296      
Annual revenue increase     $ 385      
Cayuga Combined Cycle CPCN, Gas-Fired            
Public Utilities, General Disclosures [Line Items]            
New combustion turbines (in megawatts) | MW   1,476        
Cayuga Combined Cycle CPCN, Coal-Fired            
Public Utilities, General Disclosures [Line Items]            
New combustion turbines (in megawatts) | MW   1,005        
Cayuga Combined Cycle CPCN            
Public Utilities, General Disclosures [Line Items]            
New combustion turbines (in megawatts) | MW   471        
Estimated cost of facilities   $ 3,300        
Requested rate increase, percentage, net of tax 5.60%