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Regulatory and Rate Matters Regulatory and Rate Matters (Tables) | 12 Months Ended
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Dec. 31, 2015
Regulated Operations [Abstract] |
Schedule of Rate Increases for Transmission Costs |
Effective Date |  | Aggregate Collection Amount |  | Performance Bonus
|  | (in millions)
January 1, 2013 |  | $ | 5.2 |  |  | $ | — |
March 1, 2014 |  | 5.6 |  |  | 0.7 |
March 1, 2015 |  | 5.7 |  |  | 1.5 |
March 1, 2016 |  | 6.0 |  |  | 0.7 |
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 27, 2012 |  | $ | 26.4 |  |  | $ | 2.5 |
March 20, 2013 |  | 21.9 |  |  | 2.9 |
September 17, 2013 |  | 18.1 |  |  | 2.8 |
March 13, 2014 |  | 18.2 |  |  | 2.9 |
September 8, 2014 |  | 25.2 |  |  | 4.2 |
March 16, 2015 |  | 27.1 |  |  | 4.4 |
September 10, 2015 |  | 7.0 |  |  | 1.4 |

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