Electricity supply

Electric Supply

Puget Sound Energy is the largest energy utility in the state, providing electric power to more than 1 million customers. It is a complex task that requires strategic planning and research, prudent acquisition of new energy resources and cost-effective management of a diversified power portfolio.

Approximately 46 percent of the electricity PSE customers use comes from our own power plants. We currently have about 3,000 megawatts of power-generating capacity. We purchase the rest of our power supply from a variety of other utilities, independent power producers and energy marketers across the western United States and Canada.

Source to Switch

Source to Switch is a video explaining how Puget Sound Energy customers get their electric energy from generation source to the home. Play the video at the bottom of this page.

Our diversified mix

The electricity we provide our customers is generated using a number of different resources. In 2012, hydroelectric power accounted for nearly half of our power portfolio. We also generate electricity with our own thermal power plants. We share ownership of a large coal-fired generating facility in eastern Montana, and we own several natural-gas-fired power plants in the Puget Sound region.

Wind power is a very important and increasingly prominent resource for PSE. We own and operate three large wind farms in Central and Eastern Washington. Those wind farms together produce enough electricity, on average, to power about 230,000 homes. According to the American Wind Energy Association, PSE is the second-largest utility producer of wind power in the United States.

Washington state’s renewable energy requirement


2012 Electricity Fuel Mix

The PSE fuel mix for electricity delivered to customers in 2012 is detailed in the graph below, as published by the state of Washington.

Fuel Mix Pie Chart
Fuel Percentage
Coal 30%
Hydroelectric 42%
Natural Gas 18%
Nuclear 1%
Other* 1%
Wind 8%
Total 100%

* Biomass, landfill gas, petroleum, and waste.
Source of data: Published by the Washington Department of Commerce with data reported by PSE.