Electricity supply

Puget Sound Energy is the largest utility in the state, providing electric power to more than 1.2 million customers. We’re undergoing the most significant transformation in our history as we strive to meet Washington state’s clean energy laws – some of the most ambitious in the nation – and deliver on our customers’ expectations for energy that is cleaner as well as safe and reliable.

Learn more about our clean energy milestones and implementation plans here.

Our diversified mix

To ensure system reliability, we maintain a diverse portfolio of generation resources to serve our customers. This includes renewable and non-emitting generation resources including wind, hydroelectric, solar, and battery storage.

In addition to large, utility-scale resources, we are also pursuing energy produced locally and in partnership with our neighborhoods and communities through programs like Community Solar.

We also generate electricity with our own thermal power plants which helps balance the variability of renewable resources. We own and operate several natural-gas-fired power plants in the Puget Sound region. As of Jan 1, 2026, PSE no longer serves our customers with coal-fired electricity.

2024 Electricity Fuel Mix

Diverse resources powering your home and business

The electricity generated for you uses a diverse mix of resources. The PSE fuel mix for electricity delivered to customers in 2024 is detailed in the chart and graph below.

* Biomass, non-biogenic and petroleum.

Source: Published by the Washington Department of Commerce, Nov. 2025, with data reported by PSE in August 2025.