Hannon Armstrong Sustainable Infrastructure Capital, Inc. provides debt and equity financing to the energy efficiency and renewable energy markets in the United States. The companys projects include energy efficiency projects that reduce a buildings or facilitys energy usage or cost through enhancing or installing various building components, including heating, ventilation, and air conditioning systems, as well as lighting, energy controls, roofs, windows, building shells, and/or combined heat and power systems. Its projects also comprise renewable energy projects, which deploy cleaner energy sources, such as solar and wind to generate power production. The company qualifies as a real estate investment trust for U.S. federal income tax purposes. It generally would not be subject to federal corporate income taxes if it distributes at least 90% of its taxable income to its stockholders. The company is headquartered in Annapolis, Maryland.