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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Services billings: | TXNM to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 33,095	$ 29,509	$ 99,525	$ 90,151
Services billings: | TXNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	13,192	10,976	40,314	34,703
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	178	100	368	269
Services billings: | TNMP to TXNM
Related Party Transaction [Line Items]
Amount of related party transaction	75	35	85	106
Services billings: | TNMP to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	497	0	497	0
Services billings: | TXNM to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	0	71	66	235
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	0	3,652	1,523	9,761
Interest billings: | TXNM to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	77	8	116	18
Interest billings: | TXNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	23	117	202	128
Interest billings: | PNM to TXNM
Related Party Transaction [Line Items]
Amount of related party transaction	156	153	465	426
Income tax sharing payments: | TXNM to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0	0
Income tax sharing payments: | TNMP to TXNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 0	$ 0	$ 0	$ 0

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
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

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