New legislation that would require many U.S. utilities to generate 20 percent of their electricity from renewable energy resources by 2020 was introduced Thursday by Congressman Tom Udall of New Mexico.

"The states have already shown us that renewable standards can be successful. The federal government should step in with its own standard so the entire country can enjoy the benefits of renewable energy. The nation's security and the health of our planet are too important to leave to the states." - Alan Nogee, Union of Concerned Scientists, Clean Energy Program Director