Generation of electricity from renewable sources has increased over the last decade, from 8% of total generation in the electric power sector in 2001 to 13% in 2011.

However, there are significant differences among states in the type and amount of renewable energy used, due to variation in the level of development and the availability of renewable resources.

The contribution of renewables to total generation in the electric-power sector varies widely at the state level.

For non-hydro renewables, the 2011 generation share ranges from less than 1% in Alaska, Ohio, Alabama, and Kentucky, to 27% in Maine.

When including hydro for 2011, Idaho, Washington, and Oregon produced 93%, 82%, and 78%, respectively, of in-state generation from renewables.