Regulatory and Rate Matters (Tables)

9 Months Ended

Sep. 30, 2021

Regulated Operations [Abstract]

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)
October 7, 2020	$	10.8	$	2.0
March 12, 2021	$	112.6	$	14.1
September 20, 2021	$	41.2	$	6.3