XML 37 R24.htm IDEA: XBRL DOCUMENT
v3.23.2

Regulatory Matters (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2023
Regulated Operations [Abstract] |
Regulatory Assets and Liabilities [Table Text Block] |
Regulatory Assets and Liabilities | June 30, 2023 |  | December 31, 2022 |  |
Millions |  |  |  |  |
Current Regulatory Assets (a) |  |  |  |  |
Fuel Adjustment Clause | $15.7 |  |  | $25.6 |  |  |
Total Current Regulatory Assets | $15.7 |  |  | $25.6 |  |  |
Non-Current Regulatory Assets |  |  |  |  |
Defined Benefit Pension and Other Postretirement Plans | $223.6 |  |  | $225.9 |  |  |
Income Taxes | 93.3 |  |  | 97.6 |  |  |
Cost Recovery Riders | 42.4 |  |  | 41.2 |  |  |
Asset Retirement Obligations | 36.6 |  |  | 35.6 |  |  |
Taconite Harbor (b) | 27.1 |  |  | — |  |  |
Fuel Adjustment Clause | 5.4 |  |  | 14.5 |  |  |
Manufactured Gas Plant | 14.3 |  |  | 15.1 |  |  |
PPACA Income Tax Deferral | 4.0 |  |  | 4.1 |  |  |
Other | 7.8 |  |  | 7.0 |  |  |
Total Non-Current Regulatory Assets | $454.5 |  |  | $441.0 |  |  |
Current Regulatory Liabilities (c) |  |  |  |  |
Provision for Interim Rate Refund (d) | $31.8 |  |  | $18.4 |  |  |
Transmission Formula Rates Refund | 2.5 |  |  | 4.9 |  |  |
Other | 2.1 |  |  | 0.1 |  |  |
Total Current Regulatory Liabilities | $36.4 |  |  | $23.4 |  |  |
Non-Current Regulatory Liabilities |  |  |  |  |
Income Taxes | $320.7 |  |  | $332.5 |  |  |
Wholesale and Retail Contra AFUDC | 79.3 |  |  | 80.7 |  |  |
Plant Removal Obligations | 63.7 |  |  | 60.0 |  |  |
Fuel Adjustment Clause | 17.8 |  |  | — |  |  |
North Dakota Investment Tax Credits | 16.6 |  |  | 16.9 |  |  |
Defined Benefit Pension and Other Postretirement Benefit Plans | 13.8 |  |  | 17.6 |  |  |
Non-Jurisdictional Land Sales | 12.7 |  |  | 7.5 |  |  |
Boswell Units 1 and 2 Net Plant and Equipment | 6.7 |  |  | 6.7 |  |  |
Other | 6.7 |  |  | 4.2 |  |  |
Total Non-Current Regulatory Liabilities | $538.0 |  |  | $526.1 |  |  |
(a)Current regulatory assets are presented within Prepayments and Other on the Consolidated Balance Sheet. (b)In the first quarter of 2023, Minnesota Power retired Taconite Harbor Units 1 and 2. The remaining net book value was reclassified from property, plant and equipment to a regulatory asset on the Consolidated Balance Sheet when the units were retired. Minnesota Power expects to receive recovery of the remaining net book value from customers. (c)Current regulatory liabilities are presented within Other Current Liabilities on the Consolidated Balance Sheet. (d)See 2022 Minnesota General Rate Case.

X
- References No definition available. + Details
Name: | us-gaap_RegulatedOperationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration