Mayor Bowser and the Department of Energy and Environment announced DC is number one on EPA’s 2017 Top Cities List Monday afternoon.

“We continue to be a national leader in energy efficiency and green building, and these efforts by the private sector are critical to achieving our Sustainable DC goals,” Bowser said in the release. “Washington, DC is committed to being a leader on issues related to climate change, and we will continue taking steps to lower our energy costs while building more sustainable and resilient neighborhoods.”

The 2017 Top Cities list ranks metropolitan areas by the number of buildings earning ENERGY STAR certification in 2016.

To make the list, a building must outperform 75 percent of similar buildings across the nation by earning an ENERGY STAR score of 75 or higher on their 100-point scale.

From 2009-2014, Los Angeles, Ca. held the number one spot until DC took the title in 2015. In 2016, 790 local buildings earned an ENERGY STAR rating, an increase of 104 building over 2015.

Last year, these buildings helped the District save $167 million in total energy costs and avoid emitting over 716,000 tons of greenhouse gases, about the same as taking over 151,000 passenger vehicles off the road.

District of Columbia law requires buildings over 50,000 gross square-feet to annually measure and report their energy and water performance for public knowledge, this data is published online.

“Buildings consume the most energy and are the largest source of greenhouse gas emissions in the District,” DOEE Director Tommy Wells said in the release. “But as property owners continue to track their energy and water use, they are taking steps to reduce energy consumption.”