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Microturbines are still on a learning curve in terms of maintenance, as initial commercial units have seen only two to three years of service so far. Non-fuel operation and maintenance costs are about 1,5 to 3 cents per kWh. A gas microturbine overhaul is needed every 20,000 to 40,000 hours depending on manufacturer, design, and service. A typical overhaul consists of replacing the main shaft with the compressor and turbine attached, and inspecting and if necessary replacing the combustor [26]. A good example of a microturbine project is a H.O.D. landfill in Lake County near Antioch, Illinois, which currently supplies heat and electricity to the school. The closed 20 ha municipal and industrial solid waste disposal facility was operated from 1963 to 1984. During that time, the landfill accepted approximately 2 million tons of waste. From 2002, after receiving approval from all parties involved, construction of an energy system to use the H.O.D. Landfill’s gas to produce electricity and heat for the Antioch Community High School began. Landfill gas is piping from the landfill site to 12 Capstone MicroTurbines located on the school property (2,4 km). Each Capstone MicroTurbine generates 30 kW of electricity for a combined total of 360 kW. Each microturbine also produces exhaust energy of 85 kWh at 290 ̊C. The exhaust from the microturbines is routed through a waste heat recovery system. Recovered heat is used for the school’s sports complex and swimming pool. At times when waste heat recovery is not required by the Antioch Community High School, the exhaust is automatically diverted around the exchanger, allowing for continued electrical output [34, 33]. Picture 17. Microturbines in the methane co-cogeneration plant in Antioch Community High School Source: [33] 64PDF Image | Landfill Gas Energy Technologies
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