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Non-cash operating items
 6 Months Ended
Jun. 30, 2022
Disclosure Changes In Non Cash Operating Items [Abstract]  
Non-cash operating items Non-cash operating items
The changes in non-cash operating items consist of the following:
Three months ended June 30Six months ended June 30
2022202120222021
Accounts receivable$(8,641)$63,721 $(49,253)$33,975 
Fuel and natural gas in storage(23,362)(12,043)(7,128)5,929 
Supplies and consumables inventory(3,006)(1,283)(10,775)(4,386)
Income taxes recoverable(861)(1,002)2,071 (1,167)
Prepaid expenses(5,203)(8,014)(12,553)(9,043)
Accounts payable48,424 (5,002)26,759 (44,332)
Accrued liabilities110,725 (22,062)164,021 (91,420)
Current income tax liability(1,350)773 853 5,625 
Asset retirements and environmental obligations(10,855)(72)(11,354)(531)
Net regulatory assets and liabilities(9,201)(66,845)(54,119)(334,996)
$96,670 $(51,829)$48,522 $(440,346)