Making small changes can have a big impact on the environment, that's the message the town of Vienna, Va. had in mind for its Green Expo.

Officials in Montgomery County now have more than one reason to pray for sunny days. (Actually, they have 1,250.)

The county marked the installation of its first solar power panels on government buildings Monday afternoon.

Fairfax County resident Ron Ball was one of the first people in Virginia to buy the Chevy Volt, a new eco-friendly electric car. As an avid environmentalist, he had been dreaming of owning a Volt for years. But now that he has one, he's discovering life as a proud Volt owner is more complicated than he realized.

AAA's daily fuel gauge, which tracks the average price of fuel across the country, indicates the average price of a gallon of unleaded regular in the District rose to $4.03 Saturday.

American University says it is installing Washington's largest solar power system.

Gov. Martin O'Malley's offshore wind energy bill will have to wait at least another year.

It was the worst coal mining accident in the U.S. in 40 years. One year ago, on April 5th, 2010, a build-up of methane gas fueled an explosion inside Massey Energy's Upper Big Branch mine in West Virginia. 29 men were killed.

Baltimore-based Constellation Energy says it has signed a 20-year contract with the State Department to provide electricity from renewable energy sources.