New Buildings Institute, Apr. 30, 2014.
http://newbuildings.org/news/district-zero-energy-buildings

"The District of Columbia Department of the Environment today released the findings of a recent study detailing how the District, already home to more green buildings per capita than other large cities, can best craft policy and create incentives to build zero energy, zero water and Living Buildings™." The press release includes a link to the full report.