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Dams & Our Power Sources


Mayfield Dam

We serve more than 160,000 customers within Tacoma Power's service area, which stretches across Tacoma to University Place, Fircrest, portions of Fife, Lakewood, Federal Way, Steilacoom, Joint Base Lewis-McChord, other portions of Pierce County as far south as Roy.

We use various sources of generation to keep our service territory moving. Our largest source of generation is hydro power from our seven dams on four rivers in Western Washington.

Learn about our hydro licenses with the Federal Energy Regulatory Commission

Check out our award-winning invention for cleaning moss off our dams and view the video.

Since we own hydroelectric dams, we also offer parks and recreation to the general public. Check out some great places to fish, camp and relax.


2012 Source Report

Tacoma Power produces or buys electricity from a number of different resources. We are providing you with information about the fuel used to generate the electricity you used in 2012.

The State of Washington requires that electric utilities provide this information to customers on a regular basis. The Washington Office of Trade and Economic Development, Energy Policy Section, publishes the information, based on reports from electric utilities.

Our Power Sources in 2012

Fuel Type Percentage Used
Hydro Power 89.92%
Nuclear 6.67%
Coal 2.36%
Natural Gas .88%
Other (biomass, gas, petroleum, waste, wind) <1%
Total (rounded off) 100% 




Integrated Resource Plan

Our Integrated Resource Plan (IRP) helps us assess a portfolio of available generation and conservation resources. The IRP analysis helps us ensure we have sufficient power resources to meet your long-term needs.

Read our 2013 Integrated Resource Plan (IRP) and the IRP Appendices for the most current information. 

Power conservation is also part of our power management strategy. We use conservation today as a way to efficiently meet load growth in the coming years. Learn more about our work in the 2014/2015 Conservation Plan, which is our playbook for achieving conservation targets.