Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2020

Regulated Operations [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Regulatory Assets and Liabilities	September 30, 2020	December 31, 2019
Millions
Non-Current Regulatory Assets
Defined Benefit Pension and Other Postretirement Benefit Plans	$204.9	$212.9
Income Taxes	122.3	123.4
Cost Recovery Riders	46.8	24.7
Asset Retirement Obligations	31.6	32.0
Manufactured Gas Plant	8.7	8.2
Boswell Units 1 and 2 Net Plant and Equipment	6.4	10.7
PPACA Income Tax Deferral	4.6	4.8
Other	2.6	3.8
Total Non-Current Regulatory Assets	$427.9	$420.5
Current Regulatory Liabilities (a)
Fuel Adjustment Clause (b)	$10.3	—
Provision for Interim Rate Refund (c)	5.2	—
Transmission Formula Rates Refund	1.0	$1.7
Other	1.6	0.2
Total Current Regulatory Liabilities	18.1	1.9
Non-Current Regulatory Liabilities
Income Taxes	388.0	407.2
Wholesale and Retail Contra AFUDC	86.9	79.3
Plant Removal Obligations	41.1	35.5
Defined Benefit Pension and Other Postretirement Benefit Plans	12.6	17.0
North Dakota Investment Tax Credits	12.1	12.3
Conservation Improvement Program	3.1	5.4
Other	3.3	3.6
Total Non-Current Regulatory Liabilities	547.1	560.3
Total Regulatory Liabilities	$565.2	$562.2

(a)Current regulatory liabilities are presented within Other Current Liabilities on the Consolidated Balance Sheet.

(b)Fuel adjustment clause regulatory liability represents the amount expected to be refunded to customers for the over-collection of fuel adjustment clause recoveries. (See Fuel Adjustment Clause Reform.)

(c)Provision for Interim Rate Refund represents reserves for interim rates resulting from the MPUC’s approval of Minnesota Power’s petition and proposal to resolve and withdraw its rate case. This amount is expected to be refunded to Minnesota Power regulated retail customers in the fourth quarter of 2020. (See 2020 Minnesota General Rate Case.)