Condensed Consolidated Statements of Earnings - PNM - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cost of Revenue [Abstract]
Contracts with customers	$ 384,493	$ 346,585
Alternative revenue programs	(5,505)	(909)
Other electric operating revenue	65,130	19,031
Total electric operating revenues	444,118	364,707
Operating Expenses:
Administrative and general	55,861	59,465
Depreciation and amortization	75,764	69,874
Transmission and distribution costs	18,466	17,317
Taxes other than income taxes	23,979	22,593
Total operating expenses	376,050	321,541
Operating income	68,068	43,166
Other Income and Deductions:
Interest income	4,292	3,559
Gains (losses) on investment securities	(26,573)	968
Other income	4,330	4,252
Other (deductions)	(2,241)	(3,290)
Net other income and deductions	(20,192)	5,489
Interest Charges	26,220	25,884
Earnings before Income Taxes	21,656	22,771
Income Taxes	2,438	1,566
Net Earnings	19,218	21,205
(Earnings) Attributable to Valencia Non-controlling Interest	(3,095)	(3,494)
Preferred Stock Dividend Requirements	(132)	(132)
Net Earnings Available for PNM Common Stock	15,991	17,579
Energy
Cost of Revenue [Abstract]
Total electric operating revenues	444,118	364,707
Operating Expenses:
Energy costs	168,414	115,396
Energy Production
Operating Expenses:
Energy costs	33,566	36,896
PNM
Cost of Revenue [Abstract]
Contracts with customers	275,644	251,206
Alternative revenue programs	(2,065)	976
Other electric operating revenue	65,130	19,031
Total electric operating revenues	338,709	271,213
Operating Expenses:
Administrative and general	50,347	47,134
Depreciation and amortization	45,790	41,949
Transmission and distribution costs	11,611	10,659
Taxes other than income taxes	13,565	12,639
Total operating expenses	293,693	238,163
Operating income	45,016	33,050
Other Income and Deductions:
Interest income	3,133	3,595
Gains (losses) on investment securities	(26,573)	968
Other income	3,048	2,708
Other (deductions)	(1,691)	(2,432)
Net other income and deductions	(22,083)	4,839
Interest Charges	14,572	12,893
Earnings before Income Taxes	8,361	24,996
Income Taxes	823	2,834
Net Earnings	7,538	22,162
(Earnings) Attributable to Valencia Non-controlling Interest	(3,095)	(3,494)
Net Earnings Attributable to PNM	4,443	18,668
Preferred Stock Dividend Requirements	(132)	(132)
Net Earnings Available for PNM Common Stock	4,311	18,536
PNM | Energy
Operating Expenses:
Energy costs	138,814	88,886
PNM | Energy Production
Operating Expenses:
Energy costs	$ 33,566	$ 36,896