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Construction Program and Jointly-Owned Electric Generating Plants | 12 Months Ended
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Dec. 31, 2023
Construction Program and Jointly-Owned Electric Generating Plants [Abstract] |
Construction Program and Jointly-Owned Electric Generating Plants | Construction Program and Jointly-Owned Electric Generating Plants PNM is a participant in jointly-owned power plant projects. The participation agreement for SJGS expired on September 30, 2022. The primary operating or participation agreements for the other joint projects expire in July 2041 for Four Corners, December 2046 for Luna, and November 2047 for PVNGS. PNM’s expenditures for additions to utility plant were $565.1 million in 2023, including expenditures on jointly-owned projects. TNMP does not participate in the ownership or operation of any generating plants, but incurred expenditures for additions to utility plant of $464.4 million during 2023. On a consolidated basis, PNMR’s expenditures for additions to utility plant were $1,075.8 million in 2023. Joint Projects Under the agreements for the jointly-owned projects, PNM has an undivided interest in each asset and liability of the project and records its pro-rata share of each item in the corresponding asset and liability account on PNM’s Consolidated Balance Sheets. Likewise, PNM records its pro-rata share of each item of operating and maintenance expenses for its jointly-owned plants within the corresponding operating expense account in its Consolidated Statements of Earnings. PNM is responsible for financing its share of the capital and operating costs of the joint projects. At December 31, 2023, PNM’s interests and investments in jointly-owned generating facilities are:
Station (Type) | Plant in Service |  | Accumulated Depreciation (1) |  | Construction Work in Progress |  | Composite Interest
| (In thousands)
PVNGS (Nuclear) | $ | 800,338 |  |  | $ | 403,531 |  |  | $ | 25,380 |  |  | 7.56 | %
Four Corners Units 4 and 5 (Coal) | $ | 282,875 |  |  | $ | 102,520 |  |  | $ | 7,710 |  |  | 13.00 |
Luna (Gas) | $ | 85,516 |  |  | $ | 34,893 |  |  | $ | 2,826 |  |  | 33.33 |
(1) Includes cost of removal. Palo Verde Nuclear Generating Station PNM is a participant in the three units of PVNGS with APS (the operating agent), SRP, EPE, SCE, SCPPA, and The Department of Water and Power of the City of Los Angeles. PNM previously had a 10.2% undivided interest in PVNGS, with portions of its interests in Units 1 and 2 held under leases. In January 2023, leased capacity of 104 MW in PVNGS Unit 1 expired and the rights to the capacity were acquired by SRP from the lessors subsequently, reducing PNM’s interest in PVNGS to 7.6% at December 31, 2023. In January 2024, the leased capacity of 10 MW in PVNGS Unit 2 expired and the rights were also acquired by SRP, further reducing PNM’s interest in PVNGS to 7.3%. See Note 8 for additional information concerning the PVNGS leases. Four Corners Power Plant PNM is a participant in two units of Four Corners with APS (the operating agent), an affiliate of APS, SRP, and Tucson. PNM has a 13.0% undivided interest in Units 4 and 5 of Four Corners. The Four Corners plant site is located on land within the Navajo Nation and is subject to an easement from the federal government. APS, on behalf of the Four Corners participants, negotiated amendments to an existing agreement with the Navajo Nation, which extends the owners’ right to operate the plant on the site to July 2041. See Notes 16 and 17 for additional information about Four Corners. Luna Energy Facility Luna is a combined-cycle power plant near Deming, New Mexico. Luna is owned equally by PNM, Tucson, and Samchully Power & Utilities 1, LLC. The operation and maintenance of the facility has been contracted to North American Energy Services by PNM.

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- Definition Tabular disclosure of unconditional purchase obligation not recognized as liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482648/440-10-50-4 + Details
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