Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 49,481	$ 47,928
Accounts receivable, net of allowance for credit losses	140,826	113,410
Unbilled revenues	64,874	55,504
Other receivables	28,788	23,797
Materials, supplies, and fuel stock	66,750	66,417
Regulatory assets	34,187	202
Income taxes receivable	5,323	5,672
Other current assets	57,484	64,549
Total current assets	447,713	377,479
Other Property and Investments:
Investment securities	455,409	440,115
Equity investment in NMRD	89,065	90,655
Other investments	148	284
Non-utility property, net	25,547	24,075
Total other property and investments	570,169	555,129
Utility Plant:
Plant in service, held for future use, and to be abandoned	8,723,398	8,480,799
Less accumulated depreciation and amortization	2,951,721	2,835,170
Net plant in service and plant held for future use	5,771,677	5,645,629
Construction work in progress	350,090	218,719
Nuclear fuel, net of accumulated amortization	97,055	100,801
Net utility plant	6,218,822	5,965,149
Deferred Charges and Other Assets:
Regulatory assets	544,432	557,790
Goodwill	278,297	278,297
Operating lease right-of-use assets, net of accumulated amortization	85,956	105,133
Other deferred charges	110,681	100,877
Total deferred charges and other assets	1,019,366	1,042,097
Assets	8,256,070	7,939,854
Current Liabilities:
Short-term debt	13,900	32,000
Current installments of long-term debt	104,258	575,518
Accounts payable	111,970	169,317
Customer deposits	4,876	6,606
Accrued interest and taxes	75,571	68,206
Regulatory liabilities	13,381	7,471
Operating lease liabilities	28,230	27,460
Dividends declared	28,243	28,243
Transmission interconnection arrangement liabilities	30,983	6,883
Other current liabilities	63,795	55,958
Total current liabilities	475,207	977,662
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	3,395,975	2,719,632
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	744,856	694,512
Regulatory liabilities	855,855	850,228
Asset retirement obligations	192,132	183,421
Accrued pension liability and postretirement benefit cost	46,857	58,101
Operating lease liabilities	55,106	81,065
Other deferred credits	277,189	255,230
Total deferred credits and other liabilities	2,171,995	2,122,557
Total liabilities	6,043,177	5,819,851
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	1,426,587	1,429,941
Accumulated other comprehensive income (loss), net of income taxes	(80,620)	(79,183)
Retained earnings	798,983	698,707
Total stockholders' equity	2,144,950	2,049,465
Non-controlling interest in Valencia	56,414	59,009
Total equity	2,201,364	2,108,474
Total liabilities and stockholders' equity	8,256,070	7,939,854
PNM
Current Assets:
Cash and cash equivalents	32,564	31,446
Accounts receivable, net of allowance for credit losses	106,427	88,239
Unbilled revenues	49,782	43,724
Other receivables	27,836	21,814
Affiliate receivables	8,895	8,819
Materials, supplies, and fuel stock	60,330	60,472
Regulatory assets	28,387	0
Income taxes receivable	13,562	15,706
Other current assets	49,501	51,908
Total current assets	377,284	322,128
Other Property and Investments:
Investment securities	455,409	440,115
Other investments	12	120
Non-utility property, net	10,536	9,505
Total other property and investments	465,957	449,740
Utility Plant:
Plant in service, held for future use, and to be abandoned	6,134,271	6,022,753
Less accumulated depreciation and amortization	2,232,911	2,158,915
Net plant in service and plant held for future use	3,901,360	3,863,838
Construction work in progress	201,612	148,962
Nuclear fuel, net of accumulated amortization	97,055	100,801
Net utility plant	4,200,027	4,113,601
Deferred Charges and Other Assets:
Regulatory assets	452,596	457,953
Goodwill	51,632	51,632
Operating lease right-of-use assets, net of accumulated amortization	79,808	97,461
Other deferred charges	95,872	88,518
Total deferred charges and other assets	679,908	695,564
Assets	5,723,176	5,581,033
Current Liabilities:
Short-term debt	0	10,000
Current installments of long-term debt	104,258	345,570
Accounts payable	90,020	121,050
Affiliate payables	5,336	14,058
Customer deposits	4,876	6,606
Accrued interest and taxes	43,856	32,630
Regulatory liabilities	13,381	5,419
Operating lease liabilities	26,166	25,130
Dividends declared	132	132
Transmission interconnection arrangement liabilities	30,983	6,883
Other current liabilities	38,114	26,854
Total current liabilities	357,122	594,332
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	1,628,184	1,351,050
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	619,003	579,150
Regulatory liabilities	661,272	664,873
Asset retirement obligations	191,384	182,718
Accrued pension liability and postretirement benefit cost	46,157	56,273
Operating lease liabilities	51,233	75,941
Other deferred credits	211,441	201,415
Total deferred credits and other liabilities	1,780,490	1,760,370
Total liabilities	3,765,796	3,705,752
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	1,494,918	1,494,918
Accumulated other comprehensive income (loss), net of income taxes	(80,620)	(78,511)
Retained earnings	475,139	388,336
Total stockholders' equity	1,889,437	1,804,743
Non-controlling interest in Valencia	56,414	59,009
Total equity	1,945,851	1,863,752
Total liabilities and stockholders' equity	5,723,176	5,581,033
Texas-New Mexico Power Company
Current Assets:
Cash and cash equivalents	10,916	14,800
Accounts receivable, net of allowance for credit losses	34,399	25,171
Unbilled revenues	15,092	11,780
Other receivables	2,917	3,703
Materials, supplies, and fuel stock	6,420	5,945
Regulatory assets	5,800	202
Other current assets	2,142	1,738
Total current assets	77,686	63,339
Other Property and Investments:
Other investments	136	164
Non-utility property, net	13,777	13,298
Total other property and investments	13,913	13,462
Utility Plant:
Plant in service, held for future use, and to be abandoned	2,320,978	2,193,270
Less accumulated depreciation and amortization	566,104	537,707
Net plant in service and plant held for future use	1,754,874	1,655,563
Construction work in progress	134,895	61,359
Net utility plant	1,889,769	1,716,922
Deferred Charges and Other Assets:
Regulatory assets	91,836	99,837
Goodwill	226,665	226,665
Operating lease right-of-use assets, net of accumulated amortization	5,778	7,206
Other deferred charges	5,912	5,149
Total deferred charges and other assets	330,191	338,857
Assets	2,311,559	2,132,580
Current Liabilities:
Accounts payable	15,404	33,620
Affiliate payables	3,982	5,883
Accrued interest and taxes	52,338	41,538
Regulatory liabilities	0	2,052
Operating lease liabilities	1,988	2,193
Other current liabilities	6,668	4,486
Total current liabilities	80,380	89,772
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	918,074	853,673
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	147,997	145,369
Regulatory liabilities	194,583	185,355
Asset retirement obligations	748	703
Accrued pension liability and postretirement benefit cost	700	1,828
Operating lease liabilities	3,579	4,779
Other deferred credits	35,494	25,423
Total deferred credits and other liabilities	383,101	363,457
Total liabilities	1,381,555	1,306,902
Commitments and Contingencies (Note 11)
Company common stockholders’ equity:
Common stock	64	64
Paid-in-capital	737,166	685,166
Retained earnings	192,774	140,448
Total stockholders' equity	930,004	825,678
Total liabilities and stockholders' equity	$ 2,311,559	$ 2,132,580