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Electric Operating Revenues - Narrative (Details)	Sep. 30, 2019 USD ($) utility	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Number of regulated utilities | utility	2
Contract assets	$ 0	$ 0
Customer contracts | PNM
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 76,700,000	$ 61,700,000

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