D.C.'s progress toward a goal of 100% clean energy by 2032 faces challenge of city's lack of control over electricity supply.

The top floor of the parking structure at Children’s National Research & Innovation Campus in D.C. is now covered with a canopy of 2,500 solar panels that will produce enough power to cut electric bills in half for 325 low-income families across the city. The estimated savings for each family...

Take a look at two maps of the nation’s capital: one charting upper- and lower-income neighborhoods, and one charting surface temperatures in those areas. An unsettling pattern emerges. Wealthier areas of D.C. are cooler than lower-income areas, where asphalt, concrete and the lack of trees and green space create heat...