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Regulatory and Rate Matters (Tables)

9 Months Ended

Sep. 30, 2017

Regulated Operations [Abstract]

Schedule of Energy/Capacity Transactions

Information about the purchases and sales is as follows:

	Sales							Purchases
	GWh			Amount				GWh			Amount
				(In millions)							(In millions)
Three months ended September 30, 2017	202.4			$	7.2			215.1			$	7.6
Three months ended September 30, 2016	208.2			6.2				216.4			6.4
Nine months ended September 30, 2017	615.0			17.7				632.5			18.2
Nine months ended September 30, 2016	268.5			7.8				278.8			8.1

Schedule of Rate Increases for Transmission Costs

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 10, 2015		$	7.0			$	1.4
March 23, 2016		25.8				4.3
September 8, 2016		9.5				1.8
March 14, 2017		30.2				4.8
September 13, 2017		27.5				4.7

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