v3.26.1
Regulatory Matters (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2026
USD ($)
Rate
MW
Sep. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2025
USD ($)
Regulatory Matters [Line Items]          
Total current regulatory assets $ 73,843       $ 82,136
Total long-term regulatory assets 609,709       615,324
Total current regulatory liabilities 15,762       32,401
Total long-term regulatory liabilities $ 251,404       $ 259,062
Hoosier Wind Project MW 106        
Pike Co BESS Project MW 200        
Pike Co BESS Project MwH 800        
Crossvine Project | MW 85        
Crossvine Project Storage Capacity | MW 85        
Crossvine Project MwH | MW 340        
Net Income (Loss) Attributable to Noncontrolling Interest $ (61,362) $ (61,362) $ (82,595) $ (82,595)  
Public Utilities, Requested Rate Increase (Decrease), Amount $ 90,700        
Public Utilities, Requested Debt Capital Structure, Percentage | Rate 5.34%        
Public Utilities, Disclosure of Rate Matters 5.5 billion        
Public Utilities, Requested Rate Increase (Decrease), Amount $ 90,700        
Public Utilities, Requested Return on Equity, Percentage | Rate 9.75%        
Public Utilities, Requested Debt Capital Structure, Percentage | Rate 5.34%        
Public Utilities, Disclosure of Rate Matters 5.5 billion        
Crosstrack Project MW 130        
Crosstrack Energy Storage Project 130        
Crosstrack Energy Storage Project MwH 520        
Foundry Works Project 200        
Foundry Works Project MwH 800        
Foundry Works Energy Storage Project MW 130        
Foundry Works Energy Storage Project MwH 520        
Monrovia Project ESA Estimated Benefit $ 770,000