Hannon Armstrong Sustainable Infrastructure Capital, Inc., through its subsidiaries, engages in the investment in energy efficiency, renewable energy, and sustainable infrastructure markets in the United States. The company's portfolio includes equity investments, commercial and government receivables, real estate, and debt securities. It invests in climate solution, including Behind-the-Meter that distributes energy projects which reduce energy usage or cost through heating, ventilation, and air conditioning systems, as well as lighting, energy controls, roofs, windows, building shells, and/or combined heat and power systems; Grid-Connected, a renewable energy projects that deploy cleaner energy sources, such as solar, solar-plus-storage, and wind to generate power production; and Fuels, Transport, and Nature, a range of real assets spanning high-emitting economic sectors other than the power grid such as transportation and fuels comprising renewable natural gas plants, transportation fleet enhancements, ecological restoration, and other projects. Hannon Armstrong Sustainable Infrastructure Capital, Inc. was founded in 1981 and is headquartered in Annapolis, Maryland.