The U.S. Department of Energy is a national security agency that works to advance the national, economic and energy security of the United States. It also works to promote scientific and technological innovation and ensure the environmental cleanup of the national nuclear weapon complex. The department operates more than 20 research laboratories and facilities and power marketing administrations. The U.S. Department of Energy maintains an office of environmental management that mitigates the risks and hazards posed by the production of nuclear weapons and research. Its office of policy and international affairs offers advice to the department on existing and prospective energy-related policies based on integrated data and analysis. The department maintains an energy information administration that is its statistical agency and works to provide policy-independent data, forecasts, and analyses to promote policy making markets and public understanding. The U.S. Department of Energy additionally insures the integrity and safety of the country's nuclear weapons, promotes international nuclear safety and advances nuclear nonproliferation. It is headquartered in Washington, D.C., and maintains a location in Springfield, Mo.