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Summary of the Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

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,
			2022						2021						2020
PNM
Electric plant			2.55		%				2.48		%				2.47		%
Common, intangible, and general plant			7.83		%				7.91		%				7.65		%
TNMP			3.72		%				3.88		%				3.95		%

Schedule of Inventory

Inventories consisted of the following at December 31:

			PNMR												PNM												TNMP
			2022						2021						2022						2021						2022						2021
			(In thousands)
Coal			$	985					$	2,973					$	985					$	2,973					$	—					$	—
Materials and supplies			65,748						62,088						54,905						54,969						10,843						7,119
			$	66,733					$	65,061					$	55,890					$	57,942					$	10,843					$	7,119

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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