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Financing - Schedule of Short-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Short-term Debt [Line Items]
Balance Outstanding	$ 326,400	$ 261,900
PNM
Short-term Debt [Line Items]
Balance Outstanding	70,600	137,500
Texas-New Mexico Power Company
Short-term Debt [Line Items]
Balance Outstanding	100,600	55,100
PNM Revolving Credit Facility \| PNM
Short-term Debt [Line Items]
Balance Outstanding	$ 30,600	$ 107,500
Weighted Average Interest Rate	6.67%	6.69%
PNM New Mexico Credit Facility \| PNM
Short-term Debt [Line Items]
Balance Outstanding	$ 40,000	$ 30,000
Weighted Average Interest Rate	6.69%	6.71%
TNMP Revolving Credit Facility \| Texas-New Mexico Power Company
Short-term Debt [Line Items]
Balance Outstanding	$ 100,600	$ 55,100
Weighted Average Interest Rate	6.31%	6.32%
PNMR Revolving Credit Facility \| PNMR Development
Short-term Debt [Line Items]
Balance Outstanding	$ 155,200	$ 69,300
Weighted Average Interest Rate	6.93%	6.96%