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v3.23.1

Regulatory assets and liabilities (Tables) | 3 Months Ended
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Mar. 31, 2023
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets | The following table summarizes the individual components of unamortized regulatory assets and liabilities:
| Estimated Recovery or Refund Period as of March 31, 2023 | * | March 31, 2023 | March 31, 2022 | December 31, 2022
|  |  | (In thousands)
Regulatory assets: |  |  |  |  |
Current: |  |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 198,166 |  | $ | 66,132 |  | $ | 141,306 |
Conservation programs | Up to 1 year |  | 8,599 |  | 7,567 |  | 8,544 |
Cost recovery mechanisms | Up to 1 year |  | 3,954 |  | 3,432 |  | 4,019 |
Other | Up to 1 year |  | 5,599 |  | 11,947 |  | 11,223 |
|  |  | 216,318 |  | 89,078 |  | 165,092 |
Noncurrent: |  |  |  |  |
Pension and postretirement benefits | ** |  | 143,349 |  | 142,681 |  | 143,349 |
Cost recovery mechanisms | Up to 10 years |  | 65,732 |  | 67,989 |  | 67,171 |
Plant costs/asset retirement obligations | Over plant lives |  | 44,131 |  | 63,325 |  | 44,462 |
Manufactured gas plant site remediation | - |  | 26,605 |  | 26,089 |  | 26,624 |
Environmental compliance programs | - |  | 21,942 |  | — |  | — |
Plant to be retired | - |  | 21,072 |  | 29,452 |  | 21,525 |
Taxes recoverable from customers | Over plant lives |  | 12,198 |  | 12,492 |  | 12,330 |
Long-term debt refinancing costs | Up to 37 years |  | 3,041 |  | 3,636 |  | 3,188 |
Other | Up to 16 years |  | 11,430 |  | 13,564 |  | 11,010 |
|  |  | 349,500 |  | 359,228 |  | 329,659 |
Total regulatory assets |  |  | $ | 565,818 |  | $ | 448,306 |  | $ | 494,751 |
Regulatory liabilities: |  |  |  |  |
Current: |  |  |  |  |
Electric fuel and purchased power deferral | Up to 1 year |  | 9,630 |  | — |  | 4,929 |
Natural gas costs refundable through rate adjustments | Up to 1 year |  | 6,331 |  | 13,107 |  | 955 |
Conservation programs | Up to 1 year |  | 3,834 |  | 144 |  | 4,126 |
Cost recovery mechanisms | Up to 1 year |  | 2,926 |  | 2,550 |  | 1,977 |
Taxes refundable to customers | Up to 1 year |  | 1,513 |  | 3,470 |  | 3,937 |
Refundable fuel and electric costs | Up to 1 year |  | 1,179 |  | 316 |  | 3,253 |
Other | Up to 1 year |  | 18,982 |  | 11,599 |  | 7,263 |
|  |  | 44,395 |  | 31,186 |  | 26,440 |
Noncurrent: |  |  |  |  |
Plant removal and decommissioning costs | Over plant lives |  | 214,467 |  | 171,485 |  | 208,650 |
Taxes refundable to customers | Over plant lives |  | 200,879 |  | 212,472 |  | 203,222 |
Cost recovery mechanisms | Up to 19 years |  | 16,313 |  | 9,508 |  | 14,025 |
Accumulated deferred investment tax credit | Up to 19 years |  | 13,996 |  | 13,352 |  | 13,594 |
Pension and postretirement benefits | ** |  | 7,376 |  | 20,434 |  | 7,376 |
Other | Up to 15 years |  | 1,638 |  | 6,377 |  | 1,587 |
|  |  | 454,669 |  | 433,628 |  | 448,454 |
Total regulatory liabilities |  |  | $ | 499,064 |  | $ | 464,814 |  | $ | 474,894 |
Net regulatory position |  |  | $ | 66,754 |  | $ | (16,508) |  | $ | 19,857 |
*Estimated recovery or refund period for amounts currently being recovered or refunded in rates to customers. ** Recovered as expense is incurred or cash contributions are made.
Regulatory Liabilities | The following table summarizes the individual components of unamortized regulatory assets and liabilities:
| Estimated Recovery or Refund Period as of March 31, 2023 | * | March 31, 2023 | March 31, 2022 | December 31, 2022
|  |  | (In thousands)
Regulatory assets: |  |  |  |  |
Current: |  |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 198,166 |  | $ | 66,132 |  | $ | 141,306 |
Conservation programs | Up to 1 year |  | 8,599 |  | 7,567 |  | 8,544 |
Cost recovery mechanisms | Up to 1 year |  | 3,954 |  | 3,432 |  | 4,019 |
Other | Up to 1 year |  | 5,599 |  | 11,947 |  | 11,223 |
|  |  | 216,318 |  | 89,078 |  | 165,092 |
Noncurrent: |  |  |  |  |
Pension and postretirement benefits | ** |  | 143,349 |  | 142,681 |  | 143,349 |
Cost recovery mechanisms | Up to 10 years |  | 65,732 |  | 67,989 |  | 67,171 |
Plant costs/asset retirement obligations | Over plant lives |  | 44,131 |  | 63,325 |  | 44,462 |
Manufactured gas plant site remediation | - |  | 26,605 |  | 26,089 |  | 26,624 |
Environmental compliance programs | - |  | 21,942 |  | — |  | — |
Plant to be retired | - |  | 21,072 |  | 29,452 |  | 21,525 |
Taxes recoverable from customers | Over plant lives |  | 12,198 |  | 12,492 |  | 12,330 |
Long-term debt refinancing costs | Up to 37 years |  | 3,041 |  | 3,636 |  | 3,188 |
Other | Up to 16 years |  | 11,430 |  | 13,564 |  | 11,010 |
|  |  | 349,500 |  | 359,228 |  | 329,659 |
Total regulatory assets |  |  | $ | 565,818 |  | $ | 448,306 |  | $ | 494,751 |
Regulatory liabilities: |  |  |  |  |
Current: |  |  |  |  |
Electric fuel and purchased power deferral | Up to 1 year |  | 9,630 |  | — |  | 4,929 |
Natural gas costs refundable through rate adjustments | Up to 1 year |  | 6,331 |  | 13,107 |  | 955 |
Conservation programs | Up to 1 year |  | 3,834 |  | 144 |  | 4,126 |
Cost recovery mechanisms | Up to 1 year |  | 2,926 |  | 2,550 |  | 1,977 |
Taxes refundable to customers | Up to 1 year |  | 1,513 |  | 3,470 |  | 3,937 |
Refundable fuel and electric costs | Up to 1 year |  | 1,179 |  | 316 |  | 3,253 |
Other | Up to 1 year |  | 18,982 |  | 11,599 |  | 7,263 |
|  |  | 44,395 |  | 31,186 |  | 26,440 |
Noncurrent: |  |  |  |  |
Plant removal and decommissioning costs | Over plant lives |  | 214,467 |  | 171,485 |  | 208,650 |
Taxes refundable to customers | Over plant lives |  | 200,879 |  | 212,472 |  | 203,222 |
Cost recovery mechanisms | Up to 19 years |  | 16,313 |  | 9,508 |  | 14,025 |
Accumulated deferred investment tax credit | Up to 19 years |  | 13,996 |  | 13,352 |  | 13,594 |
Pension and postretirement benefits | ** |  | 7,376 |  | 20,434 |  | 7,376 |
Other | Up to 15 years |  | 1,638 |  | 6,377 |  | 1,587 |
|  |  | 454,669 |  | 433,628 |  | 448,454 |
Total regulatory liabilities |  |  | $ | 499,064 |  | $ | 464,814 |  | $ | 474,894 |
Net regulatory position |  |  | $ | 66,754 |  | $ | (16,508) |  | $ | 19,857 |
*Estimated recovery or refund period for amounts currently being recovered or refunded in rates to customers. ** Recovered as expense is incurred or cash contributions are made.

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481691/980-715-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-2 + Details
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- Definition Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481854/980-405-25-1 + Details
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