Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2024

The recovery, refund or credit to rates for these regulatory assets and liabilities will occur over the periods either specified by the applicable regulatory authority or over the corresponding period related to the asset or liability.


Regulatory Assets and Liabilities	March 31, 2024	December 31, 2023
Millions
Current Regulatory Assets (a)
Fuel Adjustment Clause	$8.1	$8.7
Other	0.6	0.6
Total Current Regulatory Assets	$8.7	$9.3
Non-Current Regulatory Assets
Defined Benefit Pension and Other Postretirement Plans	$217.3	$218.6
Income Taxes	85.1	88.1
Asset Retirement Obligations	38.3	37.7
Cost Recovery Riders	27.6	33.8
Taconite Harbor	18.3	20.9
Manufactured Gas Plant	13.1	13.2
PPACA Income Tax Deferral	3.9	3.9
Fuel Adjustment Clause	2.1	5.0


Other	3.3	4.2
Total Non-Current Regulatory Assets	$409.0	$425.4


Current Regulatory Liabilities (b)
Fuel Adjustment Clause	$9.0	—
Provision for Interim Rate Refund	5.5	—
Transmission Formula Rates Refund	1.0	$1.5
Other	1.6	2.4
Total Current Regulatory Liabilities	$17.1	$3.9
Non-Current Regulatory Liabilities
Income Taxes	$302.3	$310.0
Wholesale and Retail Contra AFUDC	77.3	78.0
Plant Removal Obligations	69.3	67.0
Defined Benefit Pension and Other Postretirement Benefit Plans	45.5	48.6
Non-Jurisdictional Land Sales	35.1	30.2
Investment Tax Credits	13.5	13.6
Fuel Adjustment Clause	8.2	15.5


Boswell Units 1 and 2 Net Plant and Equipment	6.7	6.7
Other	6.1	4.4
Total Non-Current Regulatory Liabilities	$564.0	$574.0

(a)Current regulatory assets are presented within Prepayments and Other on the Consolidated Balance Sheet.

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