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

9 Months Ended

Sep. 30, 2017

Schedule of Deferrals Not Included in Rate Increases

As noted earlier, the Company is also limited to a 3.0% annual decoupling related cap on increases in total revenue. This limitation has been triggered as follows for natural gas with no impacts to electric:



Effective Date Accrued Through	Deferrals not Included in Annual Rate Increases (Dollars in Millions)
Natural Gas:
2016	$47.4
2015	28.7

Schedule of Graduated Scale of Rate Adjustment Mechanisms

The Washington Commission approved the following PSE requests to change rates under its electric and natural gas decoupling mechanisms:



Effective Date	Average Percentage Increase (Decrease) in Rates	Increase (Decrease) in Revenue (Dollars in Millions)¹
Electric:
May 1, 2017	2.0%	$41.9
May 1, 2016	1.0	20.8
Natural Gas:
May 1, 2017	2.4%	$22.4
May 1, 2016	2.8	25.4

_______________


¹	The increase in revenue is net of reductions from excess earnings of $11.9 million for electric and $2.2 million for natural gas in 2017, and $11.9 million for electric and $5.5 million for natural gas in 2016.

PCA Mechanism [Member] | Electric [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments

On August 7, 2015, the Washington Commission issued an order approving the settlement proposing changes to the PCA mechanism. The settlement agreement took effect January 1, 2017 and applies the following graduated scale:



	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

The graduated scale that was applicable through December 31, 2016 was as follows:



Annual Power Cost Variability	Company’s Share	Customers' Share
+/- $20 million	100%	—%
+/- $20 million - $40 million	50	50
+/- $40 million - $120 million	10	90
+/- $120 + million	5	95

Property tax tracker [Member] [Domain] | Natural Gas [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments

The following table sets forth property tax tracker mechanism rate adjustments approved by the Washington Commission and the corresponding expected annual impact on PSE’s revenue based on the effective dates:



Effective Date	Average Percentage Increase (Decrease) in Rates	Increase (Decrease) in Revenue (Dollars in Millions)
May 1, 2017	(0.1)%	$(1.1)
May 1, 2016	0.4	3.5

Property tax tracker [Member] [Domain] | Electric [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments



Effective Date	Average Percentage Increase (Decrease) in Rates	Increase (Decrease) in Revenue (Dollars in Millions)
May 1, 2017	(0.04)%	$(0.9)
May 1, 2016	0.3	5.7

Conservation Rider [Member] | Natural Gas [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments

The following table sets forth conservation rider rate adjustments approved by the Washington Commission and the corresponding expected annual impact on PSE’s revenue based on the effective dates:



Effective Date	Average Percentage Increase (Decrease) in Rates	Increase (Decrease) in Revenue (Dollars in Millions)



May 1, 2017	(0.1)%	$(1.0)
May 1, 2016	0.3	2.9

Conservation Rider [Member] | Electric [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments

The following table sets forth conservation rider rate adjustments approved by the Washington Commission and the corresponding expected annual impact on PSE’s revenue based on the effective dates:



Effective Date	Average Percentage Increase (Decrease) in Rates	Increase (Decrease) in Revenue (Dollars in Millions)
May 1, 2017	0.7%	$16.5
May 1, 2016	(0.5)	(11.7)

Treasury Grants [Member] | Electric [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments

The following table sets forth the federal incentive tracker tariff revenue requirement proposed, as originally filed, by PSE and/or approved by the Washington Commission and the corresponding expected annual impact on PSE’s revenue based on the effective dates:



Effective Date	Average Percentage Increase (Decrease) in Rates from prior year	Total credit to be passed back to eligible customers (Dollars in Millions)
January 1, 2018, proposed	0.2%	$(48.2)
January 1, 2017	0.3	(51.7)
January 1, 2016	(0.2)	(57.3)

Residential Exchange Benefit [Member] | Electric [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments

The following table sets forth residential exchange benefit adjustments approved by the Washington Commission and the corresponding expected annual impact on PSE’s revenue based on the effective dates:



Effective Date	Average Percentage Increase (Decrease) in Rates	Total credit to be passed back to eligible customers (Dollars in Millions)
October 1, 2017	(0.6)%	$(80.8)
October 1, 2015	2.4	(76.4)

Power Cost Only Rate Case (PCORC) [Member] | Electric [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments

The following table sets forth the updated compliance filing rate adjustment that became effective on December 1, 2016, by operation of law and the corresponding expected annual impact on PSE's revenue based on the effective date:



Effective Date	Average Percentage Increase (Decrease) in Rates	Increase (Decrease) in Revenue (Dollars in Millions)
December 1, 2016	(1.7)%	$(37.3)

Cost recovery mechanism [Member] | Natural Gas [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments

The following table sets forth CRM rate adjustments approved by the Washington Commission and the corresponding expected annual impact on PSE’s revenue based on the effective dates:



Effective Date	Average Percentage Increase (Decrease) in Rates	Increase (Decrease) in Revenue (Dollars in Millions)
November 1, 2017	0.5%	$4.9
November 1, 2016	0.6	5.6

Purchased Gas Adjustment (PGA) [Member] | Natural Gas [Member]

Regulation and Rates [Line Items]

Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments

The following table sets forth the PGA rate adjustments approved by the Washington Commission and the corresponding expected annual impact on PSE’s revenue based on the effective date:



Effective Date	Average Percentage Increase (Decrease) in Rates	Increase (Decrease) in Revenue (Dollars in Millions)
November 1, 2017	(3.3)%	$(30.8)
November 1, 2016	(0.4)	(4.1)