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Utility Overview

Seattle City Light is one of the nation's largest municipally owned utilities serving more than 420,000 homes and 49,000 businesses throughout Seattle, Shoreline, Lake Forest Park, Burien, Renton, Tukwila, SeaTac, Normandy Park, and Unincorporated King County. We are a not-for-profit, public utility supported by revenues from our customers, not taxes.

City Light is dedicated to delivering customers affordable, reliable, and environmentally responsible electricity services and to building equity within our workforce, our communities, and our environment. Our work toward racial, economic, and environmental justice is a demonstration of our core values.

Sources of Power

Seattle City Light-owned hydroelectric plants depend on rain and snow as their fuel. In years with normal precipitation, City Light facilities supply more than half of Seattle's power needs. The difference is made up by purchasing power from outside the service area.

Graphic showing City Light's sources of energy

Energy Efficiency Programs and Services

City Light has the longest continually running energy efficiency program in the country. Since its inception in 1977, energy efficiency measures have been installed in residential, commercial, and industrial facilities throughout our service territory. As a result, City Light's annual load was reduced by over 1.38 million megawatt-hours* in 2018. That is the equivalent annual electricity use of approximately 190,000 average Seattle homes.

City Light has supported our customers' projects with more than $37.5 million in energy efficiency incentives. More than $9 million of these payments have gone to residential customers. To date, City Light energy conservation programs have cumulatively saved customers $136 million on their energy bills.

*Source of national data: Department of Energy ( The 2018 national average annual consumption data and average rate data not available; certain 2015-2014 national average annual consumption and national average rate data were updated with revised actuals.

Rate Information

City Light is proud to offer its residential customers some of the lowest electricity rates in the nation and the Pacific Northwest. City Light rates are determined, reviewed, and approved by City Council every two years.

our rates compared to other cities

Source: EEI Summer 2019 Report or directly from each utility.

See additional information on Residential Rates or Business Rates.