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Regulatory assets and liabilities (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2023 | * | June 30, 2023 | June 30, 2022 | December 31, 2022
|  |  | (In thousands)
Regulatory assets: |  |  |  |  |
Current: |  |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 170,249 |  | $ | 83,557 |  | $ | 141,306 |
Conservation programs | Up to 1 year |  | 10,897 |  | 7,883 |  | 8,544 |
Cost recovery mechanisms | Up to 1 year |  | 4,758 |  | 3,459 |  | 4,019 |
Other | Up to 1 year |  | 7,258 |  | 7,636 |  | 11,223 |
|  |  | 193,162 |  | 102,535 |  | 165,092 |
Noncurrent: |  |  |  |  |
Pension and postretirement benefits | ** |  | 144,448 |  | 137,582 |  | 143,349 |
Cost recovery mechanisms | Up to 10 years |  | 63,890 |  | 64,096 |  | 67,171 |
Plant costs/asset retirement obligations | Over plant lives |  | 43,855 |  | 63,334 |  | 44,462 |
Manufactured gas plant site remediation | - |  | 25,764 |  | 26,031 |  | 26,624 |
Plant to be retired | - |  | 20,858 |  | 27,628 |  | 21,525 |
Environmental compliance programs | - |  | 20,611 |  | — |  | — |
Taxes recoverable from customers | Over plant lives |  | 12,099 |  | 12,365 |  | 12,330 |
Long-term debt refinancing costs | Up to 37 years |  | 2,894 |  | 3,482 |  | 3,188 |
Other | Up to 16 years |  | 10,766 |  | 12,543 |  | 11,010 |
|  |  | 345,185 |  | 347,061 |  | 329,659 |
Total regulatory assets |  |  | $ | 538,347 |  | $ | 449,596 |  | $ | 494,751 |
Regulatory liabilities: |  |  |  |  |
Current: |  |  |  |  |
Natural gas costs refundable through rate adjustments | Up to 1 year |  | 17,820 |  | 738 |  | 955 |
Electric fuel and purchased power deferral | Up to 1 year |  | 8,481 |  | 4,161 |  | 4,929 |
Cost recovery mechanisms | Up to 1 year |  | 3,304 |  | 3,172 |  | 1,977 |
Conservation programs | Up to 1 year |  | 2,851 |  | 352 |  | 4,126 |
Taxes refundable to customers | Up to 1 year |  | 1,513 |  | 3,728 |  | 3,937 |
Refundable fuel and electric costs | Up to 1 year |  | 103 |  | 1,092 |  | 3,253 |
Other | Up to 1 year |  | 13,985 |  | 4,641 |  | 7,263 |
|  |  | 48,057 |  | 17,884 |  | 26,440 |
Noncurrent: |  |  |  |  |
Plant removal and decommissioning costs | Over plant lives |  | 216,682 |  | 172,755 |  | 208,650 |
Taxes refundable to customers | Over plant lives |  | 197,757 |  | 209,022 |  | 203,222 |
Cost recovery mechanisms | Up to 19 years |  | 18,226 |  | 10,898 |  | 14,025 |
Accumulated deferred investment tax credit | Up to 19 years |  | 14,398 |  | 14,009 |  | 13,594 |
Pension and postretirement benefits | ** |  | 7,120 |  | 19,686 |  | 7,376 |
Other | Up to 15 years |  | 1,694 |  | 6,649 |  | 1,587 |
|  |  | 455,877 |  | 433,019 |  | 448,454 |
Total regulatory liabilities |  |  | $ | 503,934 |  | $ | 450,903 |  | $ | 474,894 |
Net regulatory position |  |  | $ | 34,413 |  | $ | (1,307) |  | $ | 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 June 30, 2023 | * | June 30, 2023 | June 30, 2022 | December 31, 2022
|  |  | (In thousands)
Regulatory assets: |  |  |  |  |
Current: |  |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 170,249 |  | $ | 83,557 |  | $ | 141,306 |
Conservation programs | Up to 1 year |  | 10,897 |  | 7,883 |  | 8,544 |
Cost recovery mechanisms | Up to 1 year |  | 4,758 |  | 3,459 |  | 4,019 |
Other | Up to 1 year |  | 7,258 |  | 7,636 |  | 11,223 |
|  |  | 193,162 |  | 102,535 |  | 165,092 |
Noncurrent: |  |  |  |  |
Pension and postretirement benefits | ** |  | 144,448 |  | 137,582 |  | 143,349 |
Cost recovery mechanisms | Up to 10 years |  | 63,890 |  | 64,096 |  | 67,171 |
Plant costs/asset retirement obligations | Over plant lives |  | 43,855 |  | 63,334 |  | 44,462 |
Manufactured gas plant site remediation | - |  | 25,764 |  | 26,031 |  | 26,624 |
Plant to be retired | - |  | 20,858 |  | 27,628 |  | 21,525 |
Environmental compliance programs | - |  | 20,611 |  | — |  | — |
Taxes recoverable from customers | Over plant lives |  | 12,099 |  | 12,365 |  | 12,330 |
Long-term debt refinancing costs | Up to 37 years |  | 2,894 |  | 3,482 |  | 3,188 |
Other | Up to 16 years |  | 10,766 |  | 12,543 |  | 11,010 |
|  |  | 345,185 |  | 347,061 |  | 329,659 |
Total regulatory assets |  |  | $ | 538,347 |  | $ | 449,596 |  | $ | 494,751 |
Regulatory liabilities: |  |  |  |  |
Current: |  |  |  |  |
Natural gas costs refundable through rate adjustments | Up to 1 year |  | 17,820 |  | 738 |  | 955 |
Electric fuel and purchased power deferral | Up to 1 year |  | 8,481 |  | 4,161 |  | 4,929 |
Cost recovery mechanisms | Up to 1 year |  | 3,304 |  | 3,172 |  | 1,977 |
Conservation programs | Up to 1 year |  | 2,851 |  | 352 |  | 4,126 |
Taxes refundable to customers | Up to 1 year |  | 1,513 |  | 3,728 |  | 3,937 |
Refundable fuel and electric costs | Up to 1 year |  | 103 |  | 1,092 |  | 3,253 |
Other | Up to 1 year |  | 13,985 |  | 4,641 |  | 7,263 |
|  |  | 48,057 |  | 17,884 |  | 26,440 |
Noncurrent: |  |  |  |  |
Plant removal and decommissioning costs | Over plant lives |  | 216,682 |  | 172,755 |  | 208,650 |
Taxes refundable to customers | Over plant lives |  | 197,757 |  | 209,022 |  | 203,222 |
Cost recovery mechanisms | Up to 19 years |  | 18,226 |  | 10,898 |  | 14,025 |
Accumulated deferred investment tax credit | Up to 19 years |  | 14,398 |  | 14,009 |  | 13,594 |
Pension and postretirement benefits | ** |  | 7,120 |  | 19,686 |  | 7,376 |
Other | Up to 15 years |  | 1,694 |  | 6,649 |  | 1,587 |
|  |  | 455,877 |  | 433,019 |  | 448,454 |
Total regulatory liabilities |  |  | $ | 503,934 |  | $ | 450,903 |  | $ | 474,894 |
Net regulatory position |  |  | $ | 34,413 |  | $ | (1,307) |  | $ | 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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