Some of these systems are available in the United States, with outputs from about 2 kilowatts (kW), and approximately 20,000 British thermal units (Btu) per hour of heat, to several megawatts (MW). In addition, small-scale (100 to 1,500 kW) steam engine/gen-sets and steam turbines (100 to 5,000 kW) that are fueled by solid biomass are currently available in Europe.