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Regulatory and Rate Matters Regulatory and Rate Matters (Tables) | 12 Months Ended
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Dec. 31, 2019
Regulated Operations [Abstract] |
Schedule of Energy/Capacity Transactions | Information about PNM’s purchases and sales is as follows:
| Sales |  | Purchases
| GWh |  | Amount |  | GWh |  | Amount
|  |  | (In millions) |  |  |  | (In millions)
Year Ended December 31, 2019 | 766.4 |  |  | $ | 21.7 |  |  | 693.6 |  |  | $ | 21.8 |
Year Ended December 31, 2018 | 725.7 |  |  | 25.8 |  |  | 822.7 |  |  | 28.7 |
Year Ended December 31, 2017 | 827.1 |  |  | 23.6 |  |  | 849.0 |  |  | 24.2 |
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)
March 14, 2017 |  | $ | 30.2 |  |  | $ | 4.8 |
September 13, 2017 |  | 27.5 |  |  | 4.7 |
March 27, 2018 |  | 32.0 |  |  | 0.6 |
March 21, 2019 |  | 111.8 |  |  | 14.3 |
September 19, 2019 |  | 21.9 |  |  | 3.3 |
The following sets forth TNMP’s approved EECRF increases:
Effective Date |  | Aggregate Collection Amount |  | Performance Bonus
|  | (In millions)
March 1, 2017 |  | $ | 6.0 |  |  | $ | 0.8 |
March 1, 2018 |  | 6.0 |  |  | 1.1 |
March 1, 2019 |  | 5.6 |  |  | 0.8 |

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