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Regulatory and Rate Matters - Cost Recovery Related to Joining the EIM (Details) - Energy Imbalance Market - Public Service Company of New Mexico $ in Millions	Aug. 22, 2018 USD ($)
Public Utilities, General Disclosures [Line Items]
Initial capital investments to be recovered	$ 20.9
Other expenses to be recovered	$ 7.4

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Public Utilities, Initial Capital Investments To Be Recovered

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Public Utilities, Other Expenses To Be Recovered

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