UTILITIESONGOING

Seattle City Council Parks and City Light Committee AgendaPacket 2026-07-01

Existing BPA Power Contract Drives Cost Forecast

power costs $174 million in 2026 growing to $249 million by 2032; transmission (wheeling) $76 million in 2026 growing to $146 million by 2032City of SeattleBONNEVILLE POWER ADMINISTRATIONJune 30, 2026

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Description

Seattle City Light’s existing Bonneville Power Administration Block power and transmission contract continues through September 2028, with costs projected to rise steadily before transitioning to a Slice/Block structure. The BPA supply remains the largest single power and transmission cost component in the 2027‑2032 financial forecast.

Contract Details

Contract Amount

power costs $174 million in 2026 growing to $249 million by 2032; transmission (wheeling) $76 million in 2026 growing to $146 million by 2032

Vendor

BONNEVILLE POWER ADMINISTRATION

Agency

City of Seattle, WA

Contract Type

UTILITIES

Document Date

June 30, 2026

Contract Term

through September 2028 under current Block product; transitions to Slice/Block from October 2028 through at least 2032

Renewal Date

2028-10-01

Renewal Info

Current BPA Block product contract runs through September 2028, after which it is superseded by the 16‑year Slice/Block contract starting October 2028.

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