Regulation and Rates (Tables)

12 Months Ended

Dec. 31, 2019

Regulatory Assets [Line Items]

Schedule of Net Regulatory Assets and Liabilities

The net regulatory assets and liabilities at December 31, 2019, and 2018, included the following:

Puget Sound Energy	Remaining Amortization Period	December 31,
(Dollars in Thousands)		2019		2018
Storm damage costs electric	1 to 4 years	$	121,894	$	118,331
Chelan PUD contract initiation	11.8 years	83,875		90,964
Environmental remediation	(a)	68,486		76,345
Lower Snake River	17.4 years	62,899		67,021
Decoupling deferrals and interest	Less than 2 years	43,509		65,779
Baker Dam licensing operating and maintenance costs	N/A	56,427		55,607
Deferred Washington Commission AFUDC	30 years	57,553		52,029
Property tax tracker	Less than 2 years	22,442		45,621
Unamortized loss on reacquired debt	2 to 48 years	40,177		42,378
Colstrip 1 & 2 Regulatory Asset	N/A	—		37,674
Energy conservation costs	(a)	25,272		30,701
Get to zero depreciation expense deferral	N/A	22,148		—
Advanced metering infrastructure	(a)	14,845		—
Generation plant major maintenance, excluding Colstrip	3 to 10 years	12,744		15,027
PGA deferral of unrealized losses on derivative instruments	N/A	—		14,739
White River relicensing and other costs	1 year	6,399		12,966
Mint Farm ownership and operating costs	5.3 years	10,318		12,319
PGA receivable	2 years	132,766		9,922
Snoqualmie licensing operating and maintenance costs	N/A	7,442		7,407
Colstrip major maintenance	0.0 years	2,929		6,841
PCA mechanism	N/A	41,745		4,735
Colstrip common property	4.4 years	3,188		3,903
Ferndale	0.0 years	—		3,316
Various other regulatory assets	(a)	10,474		14,583
Total PSE regulatory assets		$	847,532	$	788,208
Deferred income taxes (d)	N/A	(946,936)		(976,582)
Cost of removal	(b)	(469,922)		(424,727)
Treasury grants	18 years	(101,981)		(168,884)
Production tax credits	(c)	(85,323)		(93,616)
Gain on Sale Shuffleton	N/A	(12,483)		—
Microsoft special contract regulatory liability	N/A	(12,661)		—
Repurposed production tax credits	N/A	(23,171)		—
Accumulated provision for rate refunds	N/A	—		(34,579)
Total decoupling liability	Less than 2 years	(8,500)		(13,758)
Various other regulatory liabilities	(a)	(15,573)		(10,316)
Total PSE regulatory liabilities		(1,676,550)		(1,722,462)
PSE net regulatory assets (liabilities)		$	(829,018)	$	(934,254)

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^(a)Amortization periods vary depending on timing of underlying transactions.

^(b)The balance is dependent upon the cost of removal of underlying assets and the life of utility plant.

^(c)Amortize as PTCs are utilized by PSE on its tax return.

^(d)For additional information, see Note 14,"Income Taxes" to the consolidated financial statements included in Item 8 of this report.

Puget Energy	Remaining Amortization Period	December 31,
(Dollars in Thousands)		2019		2018
Total PSE regulatory assets	(a)	$	847,532	$	788,208
Puget Energy acquisition adjustments:
Regulatory assets related to power contracts	6 to 33 years	14,146		16,693
Total Puget Energy regulatory assets		861,678		804,901
Total PSE regulatory liabilities	(a)	(1,676,550)		(1,722,462)
Puget Energy acquisition adjustments:
Deferred income taxes		757		608
Regulatory liabilities related to power contracts	6 to 33 years	(156,597)		(162,711)
Various other regulatory liabilities	Varies	(1,265)		(1,323)
Total Puget Energy regulatory liabilities		(1,833,655)		(1,885,888)
Puget Energy net regulatory asset (liabilities)		$	(971,977)	$	(1,080,987)

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(a)Puget Energy’s regulatory assets and liabilities include purchase accounting adjustments under ASC 805.

Subsidiaries [Member] | Electricity [Member] | PCA Mechanism [Member]

Regulatory Assets [Line Items]

Schedule of Graduated Scale of Rate Adjustment Mechanism

Effective January 1, 2017, the following graduated scale is used in the PCA mechanism:

	Company’s Share				Customers' Share
Annual Power Cost Variability	Over		Under		Over		Under
Over or Under Collected by up to $17 million	100	%	100	%	—	%	—	%
Over or Under Collected by between $17 million - $40 million	35		50		65		50
Over or Under Collected beyond $40 + million	10		10		90		90