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Financing - Schedule of Long-Term Debt Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Long-term Debt, by Maturity [Abstract]
2025	$ 611,907
2026	577,648
2027	67,721
2028	301,162
2029	318,629
Thereafter	3,062,147
Total	4,939,214	$ 4,525,743
TXNM
Long-term Debt, by Maturity [Abstract]
2025	51,000
2026	410,000
2027	0
2028	0
2029	0
Thereafter	550,000
Total	1,011,000	1,000,000
PNM
Long-term Debt, by Maturity [Abstract]
2025	560,907
2026	107,648
2027	7,721
2028	241,162
2029	206,629
Thereafter	1,345,949
Total	2,470,016	2,272,545
TNMP
Long-term Debt, by Maturity [Abstract]
2025	0
2026	60,000
2027	60,000
2028	60,000
2029	112,000
Thereafter	1,166,198
Total	$ 1,458,198	$ 1,253,198

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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