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Regulatory assets and liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory assets | The following table summarizes the individual components of unamortized regulatory assets and liabilities as of December 31:
| Estimated Recovery or Refund Period | * | 2021 |  | 2020 |
|  |  | (In thousands)
Regulatory assets: |  |  |  |
Current: |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 86,371 |  | $ | 42,481 |
Decoupling | Up to 1 year |  | 9,131 |  | 703 |
Conservation programs | Up to 1 year |  | 8,225 |  | 7,117 |
Cost recovery mechanisms | Up to 1 year |  | 4,536 |  | 10,645 |
Other | Up to 1 year |  | 10,428 |  | 7,581 |
|  |  | 118,691 |  | 68,527 |
Noncurrent: |  |  |  |
Pension and postretirement benefits | ** |  | 142,681 |  | 155,942 |
Plant costs/asset retirement obligations | Over plant lives |  | 63,116 |  | 71,740 |
Plant to be retired | - |  | 50,070 |  | 65,919 |
Cost recovery mechanisms | Up to 10 years |  | 44,870 |  | 16,245 |
Manufactured gas plant sites remediation | - |  | 26,053 |  | 26,429 |
Taxes recoverable from customers | Over plant lives |  | 12,339 |  | 10,785 |
Natural gas costs recoverable through rate adjustments | Up to 2 years |  | 5,186 |  | 21,539 |
Long-term debt refinancing costs | Up to 39 years |  | 3,794 |  | 4,426 |
Other | Up to 17 years |  | 9,742 |  | 6,356 |
|  |  | 357,851 |  | 379,381 |
Total regulatory assets |  |  | $ | 476,542 |  | $ | 447,908 |
Regulatory liabilities: |  |  |  |
Current: |  |  |  |
Natural gas costs refundable through rate adjustments | Up to 1 year |  | $ | 6,700 |  | $ | 18,565 |
Taxes refundable to customers | Up to 1 year |  | 3,841 |  | 3,557 |
Electric fuel and purchased power deferral | Up to 1 year |  | — |  | 3,667 |
Other | Up to 1 year |  | 5,762 |  | 5,661 |
|  |  | 16,303 |  | 31,450 |
Noncurrent: |  |  |  |
Taxes refundable to customers | Over plant lives |  | 215,421 |  | 227,850 |
Plant removal and decommissioning costs | Over plant lives |  | 168,152 |  | 167,171 |
Pension and postretirement benefits | ** |  | 20,434 |  | 16,989 |
Other | Up to 20 years |  | 24,783 |  | 16,065 |
|  |  | 428,790 |  | 428,075 |
Total regulatory liabilities |  |  | $ | 445,093 |  | $ | 459,525 |
Net regulatory position |  |  | $ | 31,449 |  | $ | (11,617) |
*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 as of December 31:
| Estimated Recovery or Refund Period | * | 2021 |  | 2020 |
|  |  | (In thousands)
Regulatory assets: |  |  |  |
Current: |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 86,371 |  | $ | 42,481 |
Decoupling | Up to 1 year |  | 9,131 |  | 703 |
Conservation programs | Up to 1 year |  | 8,225 |  | 7,117 |
Cost recovery mechanisms | Up to 1 year |  | 4,536 |  | 10,645 |
Other | Up to 1 year |  | 10,428 |  | 7,581 |
|  |  | 118,691 |  | 68,527 |
Noncurrent: |  |  |  |
Pension and postretirement benefits | ** |  | 142,681 |  | 155,942 |
Plant costs/asset retirement obligations | Over plant lives |  | 63,116 |  | 71,740 |
Plant to be retired | - |  | 50,070 |  | 65,919 |
Cost recovery mechanisms | Up to 10 years |  | 44,870 |  | 16,245 |
Manufactured gas plant sites remediation | - |  | 26,053 |  | 26,429 |
Taxes recoverable from customers | Over plant lives |  | 12,339 |  | 10,785 |
Natural gas costs recoverable through rate adjustments | Up to 2 years |  | 5,186 |  | 21,539 |
Long-term debt refinancing costs | Up to 39 years |  | 3,794 |  | 4,426 |
Other | Up to 17 years |  | 9,742 |  | 6,356 |
|  |  | 357,851 |  | 379,381 |
Total regulatory assets |  |  | $ | 476,542 |  | $ | 447,908 |
Regulatory liabilities: |  |  |  |
Current: |  |  |  |
Natural gas costs refundable through rate adjustments | Up to 1 year |  | $ | 6,700 |  | $ | 18,565 |
Taxes refundable to customers | Up to 1 year |  | 3,841 |  | 3,557 |
Electric fuel and purchased power deferral | Up to 1 year |  | — |  | 3,667 |
Other | Up to 1 year |  | 5,762 |  | 5,661 |
|  |  | 16,303 |  | 31,450 |
Noncurrent: |  |  |  |
Taxes refundable to customers | Over plant lives |  | 215,421 |  | 227,850 |
Plant removal and decommissioning costs | Over plant lives |  | 168,152 |  | 167,171 |
Pension and postretirement benefits | ** |  | 20,434 |  | 16,989 |
Other | Up to 20 years |  | 24,783 |  | 16,065 |
|  |  | 428,790 |  | 428,075 |
Total regulatory liabilities |  |  | $ | 445,093 |  | $ | 459,525 |
Net regulatory position |  |  | $ | 31,449 |  | $ | (11,617) |
*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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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