http://www.newsweek.com/vegan-electricity-worlds-first-launched-uk-1010314

Animal products could lurk in electricity, one British power company warns—and to give consumers a choice, it's offering what it calls the world’s first vegan electricity.

Ecotricity, a renewable energy provider in the U.K., announced its electricity and gas would be certified vegan after it claimed half of British homes are powered by electricity made from animal byproducts. Company founder Dale Vince accused companies that consider themselves “ethical” or “green” of keeping consumers in the dark about their “secret ingredient.”