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Regulatory and Rate Matters - Formula Transmission Rate Case (Details) - Public Service Company of New Mexico $ in Millions	Mar. 20, 2015 USD ($) party
Wholesale Electric Transmission Rate Case
Public Utilities, General Disclosures [Line Items]
Approved additional rate increase | $	$ 1.3
Formula Transmission Rate Case
Public Utilities, General Disclosures [Line Items]
Number of additional parties entered into settlement agreement (in parties) | party	5
Return on equity	10.00%

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