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Equity Method Investment - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Results of Operations
Revenues	$ 364,707	$ 333,622
Financial Position
Construction work in progress	282,704		$ 218,719
Assets	7,943,309	7,375,119	7,939,854
Total stockholders' equity	2,030,966		2,049,465
NMRD
Results of Operations
Revenues	2,750	1,667
Operating Expenses	2,522	1,580
Net Earnings (Loss) Attributable to PNMR	228	$ 87
Financial Position
Current assets	5,005		8,046
Construction work in progress	170,032		172,585
Non-current assets	2,133		1,900
Assets	177,170		182,531
Current liabilities	1,249		841
Non-current liabilities	383		380
Total stockholders' equity	$ 175,538		$ 181,310

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