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Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Services billings: | TXNM to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 132,209	$ 124,321	$ 115,415
Services billings: | TXNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	53,166	47,470	42,293
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	440	349	411
Services billings: | TNMP to TXNM
Related Party Transaction [Line Items]
Amount of related party transaction	114	141	141
Services billings: | TNMP to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	497	0	0
Services billings: | TXNM to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	66	333	308
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	1,523	12,717	11,795
Interest billings: | TXNM to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	142	23	13
Interest billings: | TXNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	210	129	166
Interest billings: | PNM to TXNM
Related Party Transaction [Line Items]
Amount of related party transaction	612	582	249
Income tax sharing payments: | TXNM to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	2,351	5,338	0
Income tax sharing payments: | TNMP to TXNM
Related Party Transaction [Line Items]
Amount of related party transaction	10,312	15,749	8,341
Income tax sharing payments: | PNM to TXNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 0	$ 0	$ 11,602

X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

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-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-3

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section S99
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-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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