Ecotricity

Ecotricity is an energy company unlike any other. It supplies homes and businesses across Britain with green energy and then uses its customers' bills to create even more sources of renewable power—like windmills. The generation of conventional, or brown, electricity is responsible for more than 30 percent of carbon-dioxide emissions in the U.K. So one of the biggest things that people can do to slow climate change is to make energy in a different way. That's exactly what Ecotricity is doing.

Benefit to PETA: Ecotricity contributes £40 to PETA UK for every customer who joins via the site link