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Variable Interest Entities - Schedule of Impact on Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]    
Current installments of long-term debt $ 402,311 $ 611,603
Regulatory liabilities - Current 23,708 34,173
Long-term Debt 4,680,365 4,311,765
Public Service Company of New Mexico    
Variable Interest Entity [Line Items]    
Current installments of long-term debt 402,311 560,637
Regulatory liabilities - Current 21,152 33,571
Long-term Debt 2,539,180 1,898,955
Valencia | Public Service Company of New Mexico    
Variable Interest Entity [Line Items]    
Securitized Cost (included in Regulatory assets - Deferred) 330,907 336,079
Current installments of long-term debt 7,303 6,907
Accrued interest and taxes 2,435 7,452
Regulatory liabilities - Current 4,161 6,975
Long-term Debt 324,504 331,726
Valencia | Public Service Company of New Mexico | Other Current Assets    
Variable Interest Entity [Line Items]    
Restricted cash 6,189 15,838
Valencia | Public Service Company of New Mexico | Other Deferred Charges    
Variable Interest Entity [Line Items]    
Restricted cash $ 1,730 $ 1,748