While wastewater methane is both a greenhouse gas and a potentially valuable fuel source, the US EPA reports that only 2% of the US's wastewater treatment plants capture their methane to produce useful energy. In 1997, the New York Power Authority installed its first fuel cell at the Yonkers Joint Wastewater Treatment Plant. Yonkers processes 95 million gallons of wastewater per day and generates 17,400 cubic feet of digester gas per hour. Of this, 70% was used in engines and boilers, and 30% was flared. The fuel cell installation has halved the amount of flared digester gas and reduced the WWTP's regulatory risk. Meanwhile, in 2004, the Department of Natural Resources and Parks in King County, WA, began a two-year demonstration of a 1 MW molten carbonate fuel cell fueled by wastewater methane from its South Treatment Plant. As of December 2004, it reached efficiency levels of 45% on digester gas and an overall availability of 91%.