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Summary of the Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Average Rates Used Allocated Between Depreciation Expense and Construction Expense Projects Based on Use of Equipment

Average straight-line rates used were as follows:

	Year ended December 31,
	2019			2018			2017
PNM
Electric plant	2.47	%		2.40	%		2.52	%
Common, intangible, and general plant	7.91	%		8.18	%		8.36	%
TNMP	4.04	%		3.49	%		3.57	%

Schedule of Inventory

Inventories consisted of the following at December 31:

	PNMR								PNM								TNMP
	2019				2018				2019				2018				2019				2018
	(In thousands)
Coal	$	24,914			$	22,777			$	24,914			$	22,777			$	—			$	—
Materials and supplies	53,015				49,057				47,311				44,320				5,704				4,737
	$	77,929			$	71,834			$	72,225			$	67,097			$	5,704			$	4,737

Marketable Securities

Summarized financial information for NMRD is as follows:

	Results of Operations
	December 31,
	2019				2018
	(In thousands)
Operating revenues	$	3,662			$	3,147
Operating expenses	2,971				2,136
Net earnings	$	691			$	1,011

	Financial Position
	December 31,
	2019				2018
	(In thousands)
Current assets	$	7,187			$	2,581
Net property, plant, and equipment	132,772				50,784
Total assets	139,959				53,365
Current liabilities	9,640				237
Owners’ equity	$	130,319			$	53,128

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Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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