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Regulatory matters (Tables) | 6 Months Ended
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Jun. 30, 2019
Regulated Operations [Abstract] |
Regulatory Assets and Liabilities | At any given time, the Company can have several regulatory proceedings underway. The financial effects of these proceedings are reflected in the unaudited interim consolidated financial statements based on regulatory approval obtained to the extent that there is a financial impact during the applicable reporting period. The following regulatory proceedings were recently completed:
Utility | State | Regulatory proceeding type | Annual revenue increase | Effective date
Peach State Gas System | Georgia | GRAM | $2,367 | February 1, 2019
Woodmark/Tall Timbers | Texas | GRC | $484 | August 1, 2019
5. | Regulatory matters (continued)
Regulatory assets and liabilities consist of the following:
| June 30, 2019 |  | December 31, 2018
Regulatory assets |  |  |
Environmental remediation | $ | 83,903 |  |  | $ | 82,295 |
Pension and post-employment benefits | 125,412 |  |  | 125,959 |
Debt premium | 45,499 |  |  | 48,847 |
Fuel and commodity costs adjustments | 21,283 |  |  | 26,310 |
Rate adjustment mechanism | 33,516 |  |  | 37,202 |
Clean energy and other customer programs | 24,330 |  |  | 22,269 |
Deferred construction costs | 13,807 |  |  | 13,986 |
Asset retirement | 22,529 |  |  | 21,048 |
Income taxes | 34,971 |  |  | 34,822 |
Rate review costs | 8,040 |  |  | 7,990 |
Other | 33,433 |  |  | 29,746 |
Total regulatory assets | $ | 446,723 |  |  | $ | 450,474 |
Less: current regulatory assets | (42,398 | ) |  | (59,037 | )
Non-current regulatory assets | $ | 404,325 |  |  | $ | 391,437 |
Regulatory liabilities |  |  |
Income taxes | $ | 322,290 |  |  | $ | 323,384 |
Cost of removal | 196,469 |  |  | 193,564 |
Rate base offset | 9,778 |  |  | 10,900 |
Fuel and commodity costs adjustments | 19,715 |  |  | 22,552 |
Deferred compensation received in relation to lost production | 4,788 |  |  | 6,003 |
Deferred construction costs - fuel related | 7,178 |  |  | 7,258 |
Pension and post-employment benefits | 6,519 |  |  | 2,170 |
Other | 15,160 |  |  | 12,761 |
Total regulatory liabilities | $ | 581,897 |  |  | $ | 578,592 |
Less: current regulatory liabilities | (38,880 | ) |  | (39,005 | )
Non-current regulatory liabilities | $ | 543,017 |  |  | $ | 539,587 |

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