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Regulation and Rates (Tables)
12 Months Ended
Dec. 31, 2021
Regulatory Assets [Line Items]  
Schedule of Net Regulatory Assets and Liabilities
Puget EnergyRemaining Amortization PeriodDecember 31,
(Dollars in Thousands)20212020
Total PSE regulatory assets(a)$952,539 $918,107 
Puget Energy acquisition adjustments:
Regulatory assets related to power contracts
4 to 31 years
9,689 11,728 
Total Puget Energy regulatory assets962,228 929,835 
Total PSE regulatory liabilities(a)(1,709,461)(1,685,221)
Puget Energy acquisition adjustments:
Deferred income taxes565 713 
Regulatory liabilities related to power contracts
4 to 31 years
(80,934)(95,774)
Various other regulatory liabilitiesVaries(1,264)(1,264)
Total Puget Energy regulatory liabilities(1,791,094)(1,781,546)
Puget Energy net regulatory asset (liabilities)$(828,866)$(851,711)
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(a)Puget Energy’s regulatory assets and liabilities include purchase accounting adjustments under ASC 805.
Subsidiaries [Member]  
Regulatory Assets [Line Items]  
Schedule of Net Regulatory Assets and Liabilities
The net regulatory assets and liabilities at December 31, 2021, and 2020, are included the following tables:
Puget Sound EnergyRemaining Amortization PeriodDecember 31,
(Dollars in Thousands)20212020
Environmental remediation(a)$127,977 $102,647 
Storm damage costs electric4 years127,789 108,491 
PCA mechanismN/A79,546 82,801 
Decoupling deferrals and interest (b)
Less than 2 years
79,125 88,504 
Chelan PUD contract initiation9.8 years69,699 76,787 
Deferred Washington Commission AFUDC30 years62,244 59,763 
PGA receivable2 years57,935 87,655 
Baker Dam licensing operating and maintenance costs(c)54,525 54,354 
Lower Snake River15.4 years53,757 58,442 
Get to zero depreciation expense deferralN/A50,220 53,236 
Unamortized loss on reacquired debt
1 to 46 years
35,805 37,991 
Property tax tracker
Less than 2 years
25,896 24,860 
Advanced metering infrastructure(a) 23,037 22,652 
Low Income Program CostsN/A21,755 — 
Private Letter Ruling EDIT1 year18,850 — 
Generation plant major maintenance, excluding Colstrip
1 to 8 years
12,094 10,494 
Snoqualmie licensing operating and maintenance costs(c)7,446 7,435 
Mint Farm ownership and operating costs3.3 years6,318 8,318 
Washington Commission electric vehicleN/A6,109 3,641 
Water heater rental property lossN/A5,725 6,973 
Colstrip major maintenance(d)4,035 4,335 
Washington Commission COVID-19 N/A3,657 — 
Energy conservation costs(a)3,573 8,009 
Various other regulatory assets(a)15,422 10,719 
Total PSE regulatory assets$952,539 $918,107 
Deferred income taxes (e)
N/A(866,541)(953,987)
Cost of removal(f)(563,129)(508,707)
Repurposed production tax creditsN/A(134,270)(79,581)
PGA unrealized gainN/A(60,728)(4,925)
Decoupling liability
Less than 2 years
(36,506)(16,448)
Treasury grants2 years(22,476)(43,164)
Green directN/A(13,194)(14,313)
Gain on Sale ShuffletonN/A(4,892)(11,131)
Production tax credits(g)— (47,094)
Various other regulatory liabilities(a)(7,725)(5,871)
Total PSE regulatory liabilities(1,709,461)(1,685,221)
PSE net regulatory assets (liabilities)$(756,922)$(767,114)
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(a)Amortization periods vary depending on timing of underlying transactions.
(b)Decoupling deferrals and interest includes a 24 month GAAP reserve of $3.0 million and $8.0 million for December 31, 2021 and 2020, respectively.
(c)The FERC license requires PSE to incur various O&M expenses over the life of the 40 year and 50 year license for Snoqualmie and Baker, respectively. The regulatory asset represents the net present value of future expenditures and will be offset by actual costs incurred.
(d)Amortization to be determined in a future rate filing.
(e)For additional information, see Note 14,"Income Taxes" to the consolidated financial statements included in Item 8 of this report.
(f)The balance is dependent upon the cost of removal of underlying assets and the life of utility plant.
(g)Amortize as PTCs are utilized on PSE's tax return.
Schedule of Graduated Scale of Rate Adjustment Mechanism Effective January 1, 2017, the following graduated scale is used in the PCA mechanism:

Company’s ShareCustomers' Share
Annual Power Cost VariabilityOverUnderOverUnder
Over or Under Collected by up to $17 million100 %100 %— %— %
Over or Under Collected by between $17 million - $40 million35 50 

65 50 
Over or Under Collected beyond $40 + million10 10 

90 90 
Schedule of PGA Receivable Payable
The following table presents the PGA mechanism balances and activity at December 31, 2021 and December 31, 2020:
 
Puget Sound Energy
(Dollars in Thousands)At December 31,At December 31,
PGA receivable balance and activity20212020
PGA receivable beginning balance$87,655 $132,766 
Actual natural gas costs364,775 314,792 
Allowed PGA recovery(396,236)(363,886)
Interest1,741 3,983 
PGA receivable ending balance$57,935 $87,655