XML 37 R15.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Regulatory Matters | 12 Months Ended
--- | ---
Dec. 31, 2021
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Matters | Regulatory Matters Regulatory Assets and Liabilities The following presents our current and long-term regulatory assets and liabilities as of December 31, 2021 and 2020 and the period we expect to recover or refund such amounts:
| Period of |  | 2021 |  | 2020
(in thousands) | Recovery/Refund |  | Current |  | Long-Term |  | Current |  | Long-Term
Regulatory Assets |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefit Plans 1 | See below |  | $ | 7,791 |  |  | $ | 114,961 |  |  | $ | 11,037 |  |  | $ | 146,071 |
Alternative Revenue Program Riders 2 | Up to 2 years |  | 11,889 |  |  | 5,564 |  |  | 8,871 |  |  | 9,373 |
Asset Retirement Obligations 1 | Asset lives |  | — |  |  | 742 |  |  | — |  |  | 8,462 |
ISO Cost Recovery Trackers 1 | Up to 2 years |  | — |  |  | 1,342 |  |  | 1,079 |  |  | 867 |
Unrecovered Project Costs 1 | Up to 5 years |  | 2,136 |  |  | 1,455 |  |  | 361 |  |  | 2,989 |
Deferred Rate Case Expenses 1 | Various |  | 607 |  |  | 1,131 |  |  | 360 |  |  | 230 |
Debt Reacquisition Premiums 1 | Up to 30 years |  | 100 |  |  | 240 |  |  | 192 |  |  | 341 |
Fuel Clause Adjustments 1 | Up to 1 year |  | 4,819 |  |  | — |  |  | — |  |  | — |
Other 1 | Various |  | — |  |  | 73 |  |  | — |  |  | 62 |
Total Regulatory Assets |  |  | $ | 27,342 |  |  | $ | 125,508 |  |  | $ | 21,900 |  |  | $ | 168,395 |
Regulatory Liabilities |  |  |  |  |  |  |  |  |
Deferred Income Taxes | Asset lives |  | $ | — |  |  | $ | 129,437 |  |  | $ | — |  |  | $ | 134,719 |
Plant Removal Obligations | Asset lives |  | 8,306 |  |  | 101,595 |  |  | — |  |  | 98,707 |
Fuel Clause Adjustments | Up to 1 year |  | 1,554 |  |  | — |  |  | 10,947 |  |  | — |
Alternative Revenue Program Riders | Various |  | 5,772 |  |  | 3,336 |  |  | 3,581 |  |  | 470 |
Pension and Other Postretirement Benefit Plans | Up to 1 year |  | 2,603 |  |  | — |  |  | 1,959 |  |  | — |
Derivative Instruments | Up to 1 year |  | 6,214 |  |  | — |  |  | — |  |  | — |
Other | Various |  | 395 |  |  | 62 |  |  | 176 |  |  | 77 |
Total Regulatory Liabilities |  |  | $ | 24,844 |  |  | $ | 234,430 |  |  | $ | 16,663 |  |  | $ | 233,973 |
1 Costs subject to recovery without a rate of return. |  |  |  |  |  |  |  |  |
2 Amount eligible for recovery includes an incentive or rate of return. |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefit Plans represent benefit costs and actuarial losses and gains subject to recovery or refund through rates as they are expensed or amortized. These unrecognized benefit costs and actuarial losses and gains are eligible for treatment as regulatory assets or liabilities based on their probable inclusion in future electric rates. Alternative Revenue Program Riders regulatory assets and liabilities are revenues not yet collected from customers or amounts subject to refund, respectively, primarily due to investments in qualifying transmission, conservation, renewable resource, environmental and other generation assets. Asset Retirement Obligations represent the difference in timing of recognition of expense arising from these obligations and the amount recovered from customers. Independent System Operator (ISO) Cost Recovery Trackers represent costs incurred to serve Minnesota customers or the under-collection of revenue based on expected versus actual construction costs on eligible projects. Unrecovered Project Costs reflect costs incurred for abandoned generation and transmission assets and accelerated depreciation expense on a to-be-retired generation asset expected to be recovered from customers. Deferred Rate Case Expenses relate to costs incurred in conjunction with recent rate cases that are currently or are expected to be recovered from customers. Debt Reacquisition Premiums represent costs to retire debt which are being recovered from customers over the remaining original lives of the reacquired debt. Fuel Clause Adjustments represent the under- or over-collection of fuel costs to be returned to or collected from customers. Deferred Income Taxes represent income tax benefits, arising primarily from property-related timing differences, that will be refunded to customers as these timing differences reverse. Plant Removal Obligations represent amounts collected from customers to be used to cover actual removal costs as incurred. Derivative Instruments represent unrealized gains recognized on derivative instruments. On final settlement of such instruments, any realized gains or losses are recovered from or paid to customers.

X
- References No definition available. + Details
Name: | us-gaap_RegulatoryAssetsAndLiabilitiesDisclosureAbstract
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