Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 47,928	$ 3,833
Accounts receivable, net of allowance for uncollectible accounts	113,410	85,889
Unbilled revenues	55,504	57,416
Other receivables	23,797	12,165
Materials, supplies, and fuel stock	66,417	77,929
Regulatory assets	202	7,373
Income taxes receivable	5,672	4,933
Other current assets	64,549	44,472
Total current assets	377,479	294,010
Other Property and Investments:
Investment securities	440,115	388,832
Equity investment in NMRD	90,655	65,159
Other investments	284	356
Non-utility property, including financing leases	24,075	12,459
Total other property and investments	555,129	466,806
Utility Plant:
Plant in service, held for future use, and to be abandoned	8,480,799	7,918,601
Less accumulated depreciation and amortization	2,835,170	2,713,503
Net plant in service and plant held for future use	5,645,629	5,205,098
Construction work in progress	218,719	161,106
Nuclear fuel, net of accumulated amortization of $41,367 and $42,354	100,801	99,805
Net utility plant	5,965,149	5,466,009
Deferred Charges and Other Assets:
Regulatory assets	557,790	556,930
Goodwill	278,297	278,297
Operating lease assets, net of amortization	105,133	131,212
Other deferred charges	100,877	105,510
Total deferred charges and other assets	1,042,097	1,071,949
Total assets	7,939,854	7,298,774
Current Liabilities:
Short-term debt	32,000	185,100
Current installments of long-term debt	575,518	490,268
Accounts payable	169,317	103,118
Customer deposits	6,606	10,585
Accrued interest and taxes	68,206	76,815
Regulatory liabilities	7,471	505
Operating lease liabilities	27,460	29,068
Dividends declared	28,243	24,625
Other current liabilities	62,841	47,397
Total current liabilities	977,662	967,481
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	2,719,632	2,517,449
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	694,512	626,058
Regulatory liabilities	850,228	866,243
Asset retirement obligations	183,421	181,962
Accrued pension liability and postretirement benefit cost	58,101	95,037
Operating lease liabilities	81,065	105,512
Other deferred credits	255,230	185,753
Total deferred credits and other liabilities	2,122,557	2,060,565
Total liabilities	5,819,851	5,545,495
Commitments and Contingencies (See Note 16)
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	1,429,941	1,150,552
Accumulated other comprehensive income (loss), net of income taxes	(79,183)	(99,377)
Retained earnings	698,707	627,523
Total PNMR common stockholders’ equity	2,049,465	1,678,698
Non-controlling interest in Valencia	59,009	63,052
Total equity	2,108,474	1,741,750
Total liabilities and stockholders' equity	$ 7,939,854	$ 7,298,774
Common stock, shares issued (in shares)	85,834,874	85,834,874
Common stock, shares outstanding (in shares)	79,653,624	79,653,624
Public Service Company of New Mexico
Current Assets:
Cash and cash equivalents	$ 31,446	$ 1,001
Accounts receivable, net of allowance for uncollectible accounts	88,239	60,447
Unbilled revenues	43,724	46,602
Other receivables	21,814	11,039
Affiliate receivables	8,819	8,825
Materials, supplies, and fuel stock	60,472	72,225
Regulatory assets	0	7,373
Income taxes receivable	15,706	15,122
Other current assets	51,908	36,561
Total current assets	322,128	259,195
Other Property and Investments:
Investment securities	440,115	388,832
Other investments	120	178
Non-utility property, including financing leases	9,505	4,470
Total other property and investments	449,740	393,480
Utility Plant:
Plant in service, held for future use, and to be abandoned	6,022,753	5,753,267
Less accumulated depreciation and amortization	2,158,915	2,076,291
Net plant in service and plant held for future use	3,863,838	3,676,976
Construction work in progress	148,962	108,787
Nuclear fuel, net of accumulated amortization of $41,367 and $42,354	100,801	99,805
Net utility plant	4,113,601	3,885,568
Deferred Charges and Other Assets:
Regulatory assets	457,953	435,467
Goodwill	51,632	51,632
Operating lease assets, net of amortization	97,461	120,585
Other deferred charges	88,518	97,064
Total deferred charges and other assets	695,564	704,748
Total assets	5,581,033	5,242,991
Current Liabilities:
Short-term debt	10,000	58,000
Current installments of long-term debt	345,570	350,268
Accounts payable	121,050	66,746
Affiliate payables	14,058	12,524
Customer deposits	6,606	10,585
Accrued interest and taxes	32,630	43,617
Regulatory liabilities	5,419	371
Operating lease liabilities	25,130	25,927
Dividends declared	132	132
Other current liabilities	33,737	25,066
Total current liabilities	594,332	593,236
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	1,351,050	1,397,752
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	579,150	521,990
Regulatory liabilities	664,873	683,398
Asset retirement obligations	182,718	181,081
Accrued pension liability and postretirement benefit cost	56,273	87,838
Operating lease liabilities	75,941	97,992
Other deferred credits	201,415	155,744
Total deferred credits and other liabilities	1,760,370	1,728,043
Total liabilities	3,705,752	3,719,031
Commitments and Contingencies (See Note 16)
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	1,494,918	1,264,918
Accumulated other comprehensive income (loss), net of income taxes	(78,511)	(99,055)
Retained earnings	388,336	283,516
Total PNMR common stockholders’ equity	1,804,743	1,449,379
Non-controlling interest in Valencia	59,009	63,052
Total equity	1,863,752	1,512,431
Total liabilities and stockholders' equity	$ 5,581,033	$ 5,242,991
Common stock, shares issued (in shares)	39,117,799	39,117,799
Common stock, shares outstanding (in shares)	39,117,799	39,117,799
Texas-New Mexico Power Company
Current Assets:
Cash and cash equivalents	$ 14,800	$ 1,000
Accounts receivable, net of allowance for uncollectible accounts	25,171	25,442
Unbilled revenues	11,780	10,814
Other receivables	3,703	2,713
Affiliate receivables	0	0
Materials, supplies, and fuel stock	5,945	5,704
Regulatory assets	202	0
Other current assets	1,738	1,280
Total current assets	63,339	46,953
Other Property and Investments:
Other investments	164	178
Non-utility property, including financing leases	13,298	6,684
Total other property and investments	13,462	6,862
Utility Plant:
Plant in service, held for future use, and to be abandoned	2,193,270	1,919,256
Less accumulated depreciation and amortization	537,707	516,795
Net plant in service and plant held for future use	1,655,563	1,402,461
Construction work in progress	61,359	42,554
Net utility plant	1,716,922	1,445,015
Deferred Charges and Other Assets:
Regulatory assets	99,837	121,463
Goodwill	226,665	226,665
Operating lease assets, net of amortization	7,206	9,954
Other deferred charges	5,149	3,527
Total deferred charges and other assets	338,857	361,609
Total assets	2,132,580	1,860,439
Current Liabilities:
Short-term debt	0	15,000
Accounts payable	33,620	20,598
Affiliate payables	5,883	5,419
Accrued interest and taxes	41,538	42,068
Regulatory liabilities	2,052	134
Operating lease liabilities	2,193	2,753
Other current liabilities	4,486	3,565
Total current liabilities	89,772	89,537
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	853,673	670,691
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	145,369	140,151
Regulatory liabilities	185,355	182,845
Asset retirement obligations	703	881
Accrued pension liability and postretirement benefit cost	1,828	7,199
Operating lease liabilities	4,779	7,039
Other deferred credits	25,423	7,469
Total deferred credits and other liabilities	363,457	345,584
Total liabilities	1,306,902	1,105,812
Commitments and Contingencies (See Note 16)
Company common stockholders’ equity:
Common stock	64	64
Paid-in-capital	685,166	614,166
Retained earnings	140,448	140,397
Total PNMR common stockholders’ equity	825,678	754,627
Total liabilities and stockholders' equity	$ 2,132,580	$ 1,860,439
Common stock, shares issued (in shares)	6,358	6,358
Common stock, shares outstanding (in shares)	6,358	6,358