Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 2,823	$ 3,833	$ 4,226	$ 2,122
Accounts receivable, net of allowance for credit losses	96,209	85,889
Unbilled revenues	70,480	57,416
Other receivables	10,349	12,165
Materials, supplies, and fuel stock	69,676	77,929
Regulatory assets	21,574	7,373
Income taxes receivable	4,494	4,933
Other current assets	51,279	44,472
Total current assets	326,884	294,010
Other Property and Investments:
Investment securities	389,452	388,832
Equity investment in NMRD	84,037	65,159
Other investments	336	356
Non-utility property, net	19,679	12,459
Total other property and investments	493,504	466,806
Utility Plant:
Plant in service, held for future use, and to be abandoned	8,030,505	7,918,601
Less accumulated depreciation and amortization	2,773,434	2,713,503
Net plant in service and plant held for future use	5,257,071	5,205,098
Construction work in progress	309,513	161,106
Nuclear fuel, net of accumulated amortization	101,994	99,805
Net utility plant	5,668,578	5,466,009
Deferred Charges and Other Assets:
Regulatory assets	582,586	556,930
Goodwill	278,297	278,297	278,297
Operating lease right-of-use assets, net of accumulated amortization	118,140	131,212
Other deferred charges	106,478	105,510
Total deferred charges and other assets	1,085,501	1,071,949
Assets	7,574,467	7,298,774	7,048,667
Current Liabilities:
Short-term debt	252,549	185,100
Current installments of long-term debt	779,372	490,268
Accounts payable	75,933	103,118
Customer deposits	10,004	10,585
Accrued interest and taxes	60,807	76,815
Regulatory liabilities	3,659	505
Operating lease liabilities	26,744	29,068
Dividends declared	132	24,625
Other current liabilities	56,574	47,397
Total current liabilities	1,265,774	967,481
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	2,437,246	2,517,449
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	647,883	626,058
Regulatory liabilities	867,953	866,243
Asset retirement obligations	181,805	181,962
Accrued pension liability and postretirement benefit cost	87,248	95,037
Operating lease liabilities	91,320	105,512
Other deferred credits	227,282	185,753
Total deferred credits and other liabilities	2,103,491	2,060,565
Total liabilities	5,806,511	5,545,495
Commitments and Contingencies (Note 11)
Cumulative Preferred Stock of Subsidiary without mandatory redemption requirements ($100 stated value; 10,000,000 shares authorized; issued and outstanding 115,293 shares)	11,529	11,529
Company common stockholders’ equity:
Common stock	1,143,822	1,150,552
Accumulated other comprehensive income (loss), net of income taxes	(92,581)	(99,377)
Retained earnings	645,259	627,523
Total stockholders' equity	1,696,500	1,678,698
Non-controlling interest in Valencia	59,927	63,052
Total equity	1,756,427	1,741,750	1,674,740	1,752,594
Total liabilities and stockholders' equity	7,574,467	7,298,774
PNM
Current Assets:
Cash and cash equivalents	946	1,001	2,239	85
Accounts receivable, net of allowance for credit losses	66,618	60,447
Unbilled revenues	58,592	46,602
Other receivables	9,459	11,039
Affiliate receivables	8,941	8,825
Materials, supplies, and fuel stock	63,452	72,225
Regulatory assets	17,722	7,373
Income taxes receivable	15,448	15,122
Other current assets	40,114	36,561
Total current assets	281,292	259,195
Other Property and Investments:
Investment securities	389,452	388,832
Other investments	158	178
Non-utility property, net	7,587	4,470
Total other property and investments	397,197	393,480
Utility Plant:
Plant in service, held for future use, and to be abandoned	5,807,772	5,753,267
Less accumulated depreciation and amortization	2,112,706	2,076,291
Net plant in service and plant held for future use	3,695,066	3,676,976
Construction work in progress	175,076	108,787
Nuclear fuel, net of accumulated amortization	101,994	99,805
Net utility plant	3,972,136	3,885,568
Deferred Charges and Other Assets:
Regulatory assets	471,696	435,467
Goodwill	51,632	51,632
Operating lease right-of-use assets, net of accumulated amortization	109,042	120,585
Other deferred charges	94,427	97,064
Total deferred charges and other assets	726,797	704,748
Assets	5,377,422	5,242,991
Current Liabilities:
Short-term debt	87,055	58,000
Current installments of long-term debt	189,921	350,268
Accounts payable	52,418	66,746
Affiliate payables	15,708	12,524
Customer deposits	10,004	10,585
Accrued interest and taxes	34,439	43,617
Regulatory liabilities	2,741	371
Operating lease liabilities	24,039	25,927
Dividends declared	132	132
Other current liabilities	31,051	25,066
Total current liabilities	447,508	593,236
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	1,656,684	1,397,752
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	540,434	521,990
Regulatory liabilities	676,454	683,398
Asset retirement obligations	180,888	181,081
Accrued pension liability and postretirement benefit cost	80,715	87,838
Operating lease liabilities	85,028	97,992
Other deferred credits	191,984	155,744
Total deferred credits and other liabilities	1,755,503	1,728,043
Total liabilities	3,859,695	3,719,031
Commitments and Contingencies (Note 11)
Cumulative Preferred Stock of Subsidiary without mandatory redemption requirements ($100 stated value; 10,000,000 shares authorized; issued and outstanding 115,293 shares)	11,529	11,529
Company common stockholders’ equity:
Common stock	1,264,918	1,264,918
Accumulated other comprehensive income (loss), net of income taxes	(90,992)	(99,055)
Retained earnings	272,345	283,516
Total stockholders' equity	1,446,271	1,449,379
Non-controlling interest in Valencia	59,927	63,052
Total equity	1,506,198	1,512,431	1,402,493	1,461,571
Total liabilities and stockholders' equity	5,377,422	5,242,991
Texas-New Mexico Power Company
Current Assets:
Cash and cash equivalents	231	1,000	0	0
Accounts receivable, net of allowance for credit losses	29,591	25,442
Unbilled revenues	11,888	10,814
Other receivables	2,512	2,713
Materials, supplies, and fuel stock	6,224	5,704
Regulatory assets	3,852	0
Other current assets	2,135	1,280
Total current assets	56,433	46,953
Other Property and Investments:
Other investments	178	178
Non-utility property, net	10,814	6,684
Total other property and investments	10,992	6,862
Utility Plant:
Plant in service, held for future use, and to be abandoned	1,971,908	1,919,256
Less accumulated depreciation and amortization	530,230	516,795
Net plant in service and plant held for future use	1,441,678	1,402,461
Construction work in progress	124,383	42,554
Net utility plant	1,566,061	1,445,015
Deferred Charges and Other Assets:
Regulatory assets	110,890	121,463
Goodwill	226,665	226,665
Operating lease right-of-use assets, net of accumulated amortization	8,535	9,954
Other deferred charges	6,145	3,527
Total deferred charges and other assets	352,235	361,609
Assets	1,985,721	1,860,439
Current Liabilities:
Short-term debt	13,094	15,000
Accounts payable	16,674	20,598
Affiliate payables	7,020	5,419
Accrued interest and taxes	42,961	42,068
Regulatory liabilities	918	134
Operating lease liabilities	2,428	2,753
Other current liabilities	5,823	3,565
Total current liabilities	88,918	89,537
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	780,561	670,691
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	139,855	140,151
Regulatory liabilities	191,499	182,845
Asset retirement obligations	917	881
Accrued pension liability and postretirement benefit cost	6,533	7,199
Operating lease liabilities	5,897	7,039
Other deferred credits	12,087	7,469
Total deferred credits and other liabilities	356,788	345,584
Total liabilities	1,226,267	1,105,812
Commitments and Contingencies (Note 11)
Company common stockholders’ equity:
Common stock	64	64
Paid-in-capital	614,166	614,166
Retained earnings	145,224	140,397
Total stockholders' equity	759,454	754,627	$ 678,647	$ 674,093
Total liabilities and stockholders' equity	$ 1,985,721	$ 1,860,439