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Income Taxes - Schedule of Components of Net Accumulated Deferred Income Tax Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Net operating loss $ 31,592 $ 16,833
Regulatory liabilities related to income taxes 82,702 90,461
Federal tax credit carryforwards 126,770 124,510
Regulatory disallowances 42,330 42,330
Regulatory liability SJGS retirement credits 40 28,797
Other 52,955 35,492
Total deferred tax assets 336,389 338,423
Deferred tax liabilities:    
Depreciation and plant related (794,203) (738,078)
Investment tax credit (81,068) (95,046)
Regulatory assets related to income taxes (84,053) (80,643)
Pension (41,383) (41,141)
Regulatory asset for shutdown of SJGS Units 2 and 3 (20,860) (22,454)
Regulatory asset SJGS energy transition property (85,365) (86,521)
Regulatory asset PVNGS investment (21,044) (20,503)
PVNGS trusts (48,421) (41,767)
Other (59,384) (57,550)
Total deferred tax liabilities (1,235,781) (1,183,703)
Net accumulated deferred income tax liabilities (899,392) (845,280)
PNM    
Deferred tax assets:    
Net operating loss 0 0
Regulatory liabilities related to income taxes 64,481 71,546
Federal tax credit carryforwards 93,481 80,586
Regulatory disallowances 42,330 42,330
Regulatory liability SJGS retirement credits 40 28,797
Other 35,650 35,993
Total deferred tax assets 235,982 259,252
Deferred tax liabilities:    
Depreciation and plant related (582,089) (545,815)
Investment tax credit (81,068) (73,844)
Regulatory assets related to income taxes (75,464) (71,742)
Pension (36,678) (36,483)
Regulatory asset for shutdown of SJGS Units 2 and 3 (20,860) (22,454)
Regulatory asset SJGS energy transition property (85,365) (86,521)
Regulatory asset PVNGS investment (21,044) (20,503)
PVNGS trusts (48,421) (41,767)
Other (41,211) (44,160)
Total deferred tax liabilities (992,200) (943,289)
Net accumulated deferred income tax liabilities (756,218) (684,037)
TNMP    
Deferred tax assets:    
Regulatory liabilities related to income taxes 18,221 18,915
Other 4,522 5,534
Total deferred tax assets 22,743 24,449
Deferred tax liabilities:    
Depreciation and plant related (200,709) (179,483)
Regulatory assets related to income taxes (8,589) (8,901)
Loss on reacquired debt (4,981) (5,254)
Pension (4,706) (4,659)
AMS (2,709) (2,613)
Other (9,156) (2,287)
Total deferred tax liabilities (230,850) (203,197)
Net accumulated deferred income tax liabilities $ (208,107) $ (178,748)