Regulation and Rates Public Utilities, Regulatory Proceeding (Tables) - Subsidiaries [Member]

9 Months Ended

Sep. 30, 2021

Purchased Gas Adjustment [Member] | Natural Gas

Regulation and Rates [Line Items]

Schedule of PGA Receivable Payable

The following table presents the PGA mechanism balances and activity at September 30, 2021 and December 31, 2020:

Puget Sound Energy
(Dollars in Thousands)	At September 30,		At December 31,
PGA receivable balance and activity	2021		2020
PGA receivable beginning balance	$	87,655	$	132,766
Actual natural gas costs	218,934		314,792
Allowed PGA recovery	(251,633)		(363,886)
Interest	1,312		3,983
PGA receivable ending balance	$	56,268	$	87,655

PCA Mechanism [Member] | Electricity

Regulation and Rates [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