District of Columbia Mayor Vincent Gray (D) announced June 6 that he would soon introduce the Ban on Combustion of Coal Act of 2013 as part of his Sustainable D.C. initiative. The announcement came on the same day that the District Department of the Environment issued four permits for the construction of two highly efficient cogeneration systems in the U.S. Capitol Power Plant, which will reduce the plant’s reliance on older coal-burning equipment. The bill would permit coal combustion for tests and during emergencies, and would exempt cooking charcoal from the ban.