Regulatory and Rate Matters - Cost Recovery Related to Joining the EIM (Details) - Energy Imbalance Market - Public Service Company of New Mexico $ in Millions |
Dec. 31, 2018
USD ($)
|
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Public Utilities, General Disclosures [Line Items] | |
Initial capital investments to be recovered | $ 20.9 |
Other expenses to be recovered | $ 7.4 |