Covanta Holding has seen the light: Waste can be converted into power. Led by Covanta Energy, the company is a leader in the waste-to-energy market. Covanta Holding owns or operates more than 60 energy generation facilities (primarily in the US) that use municipal solid waste and biomass, as well as fossil fuels and hydroelectric sources, to generate power. It processes about 20 million tons of solid waste per year and provides electricity to some 1 million homes. Related businesses include landfills, ashfills, transfer stations, and metals recycling. The company recycles 430,000 tons of metal a year.