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Environmental allowances and obligations (Policies) | 9 Months Ended
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Sep. 30, 2023
Accounting Policies [Abstract] |
Emission Credits or Allowances, Policy | Environmental allowances and obligations The Company's natural gas distribution segment acquires environmental allowances as part of its requirement to comply with environmental regulations in certain states. Allowances are allocated by the respective states to the Company at no cost and additional allowances are required to be purchased as needed based on the requirements in the respective states. The segment records purchased and allocated environmental allowances at weighted average cost under the inventory method of accounting. Environmental allowances are included in noncurrent assets - other on the Consolidated Balance Sheets. Environmental compliance obligations, which are based on GHG emissions, are measured at the carrying value of environmental allowances held plus the estimated value of additional allowances necessary to satisfy the compliance obligation. Environmental compliance obligations are included in noncurrent liabilities - other on the Consolidated Balance Sheets. At September 30, 2023, the Company accrued $36.6 million in compliance obligations. The Company recognizes revenue from the sale of emissions allowances allocated under the environmental programs when the allowances are sold at auction. The revenues associated with the sale of these allowances are deferred as a component of the respective jurisdiction’s regulatory asset or liability for environmental compliance. As environmental allowances are surrendered, the segment reduces the associated environmental compliance assets and liabilities from the Consolidated Balance Sheets. The expenses and revenues associated with the Company’s environmental allowances and obligations are deferred as regulatory assets and liabilities. For more information on the Company’s regulatory assets and liabilities, see Note 12.

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- Definition Disclosure of accounting policy for emission credits or allowances. Such accounting policy has generally been based on an inventory or intangible asset model. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 25 -Paragraph 1 -SubTopic 15 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481116/815-15-25-1 + Details
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