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Regulatory and Rate Matters (Tables) | 9 Months Ended
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Sep. 30, 2022
Regulated Operations [Abstract] |
Schedule of Public Utilities, Property, Plant And Equipment, Plant Abandonment, Amortization of Present Value of Regulated Asset For Plant Abandonment | On September 29, 2022, SJGS was removed from service and as a result, PNM made the following adjustments on the Condensed Consolidated Balance Sheets as of September 30, 2022:
|  | Net Increase (decrease)
|  | (In thousands)
Current Assets: |  |
Inventory |  | $ | (6,430) |
Utility Plant: |  |
Net utility plant |  | $ | (382,798) |
Deferred Charges and Other Assets: |  |
Regulatory assets - ETA (1) |  | $ | 289,381 |
Regulatory assets - Non-ETA (2) |  | $ | 22,593 |
Deferred Credits and Other Liabilities: |  |
Regulatory liabilities (3) |  | $ | (77,254) |
|  | $ | — |
(1) To be recovered through the Energy Transition Charge, which includes undepreciated investments of $274.9 million and plant decommissioning of $14.5 million, previously reflected in Net utility plant. (2) Authorized to be recorded as regulatory assets for certain other abandonment costs that are not specifically addressed under the provisions of the ETA to preserve its ability to recover the costs in a future general rate case, which includes obsolete inventory of $6.4 million and plant decommissioning of $16.2 million, previously reflected in Net utility plant. (3) Includes cost of removal and accelerated depreciation of SNCRs.
Schedule of Rate Increases for Transmission Costs | The following sets forth TNMP’s recent interim transmission cost rate increases:
Effective Date |  | Approved Increase in Rate Base |  | Annual Increase in Revenue
|  | (In millions)
September 20, 2021 |  | 41.2 |  |  | 6.3 |
March 25, 2022 |  | 95.6 |  |  | 14.2 |
September 22, 2022 |  | 36.0 |  |  | 5.3 |

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