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MICROTURBINE OPERATING EXPERIENCE AT LANDFILLS

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MICROTURBINE OPERATING EXPERIENCE AT LANDFILLS ( microturbine-operating-experience-at-landfills )

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Shepard Landfill In a CANMET-funded project, microturbine distributor Gridlink/Enerflex in Calgary, working with CH2M-Hill, created a trailer-mounted housing for a single 30 kW microturbine and all LFG processing equipment. The portable system offers web-based remote monitoring and dispatch. The project had accumulated more than 1,000 hours as of mid-2002. Significant learnings from this site included: Discovery of gas flow deposits related to deliquescent drying media, refrigeration-type drying recommended; More frequent than anticipated manual draining of gas driers, automated condensate handling recommended; These early experiences developed into a knowledge base of the best practices that SCS Energy incorporated in their Calabasas Landfill MicroTurbine Project. CALABASAS MICROTURBINE PROJECT Project Participants • Sanitation Districts of Los Angeles County, local landfill owner & operator; • South Coast Air Quality Management District, local air regulation & enforcement agency • SCS Energy, turnkey LFG solution provider • Capstone Turbine Corporation, microturbine provider. Calabasas Landfill & LFG Collection System The installation at Calabasas Landfill is the fourth Capstone landfill gas installation with several thousand hours of operation. The system incorporates the best practices from prior biogas experiences as well as those derived from non-LFG projects. The Calabasas Landfill is operated by the Sanitation Districts of Los Angeles County (LACSD). LACSD is a confederation of 25 special districts serving about 5.4 million people in Los Angeles County. The Sanitation Districts' service area covers approximately 800 square miles and encompasses 78 cities and unincorporated territory within the County. Calabasas Landfill is one of three active landfills in the Sanitation Districts, and occupies 416 acres at the border of the cities of Agoura and Calabasas, California. The landfill began disposal operations in 1961 and remains active with approximately 20 million tons of refuse in place. It currently accepts up to 2,000 tons of municipal solid waste daily. The Calabasas LFG collection and control system consists of: • about 600 vertical extraction wells; • more than 60,000 linear feet of horizontal trench collectors; • more than 50,000 linear feet of above-grade PVC landfill gas collection piping; • a flare station incorporating several enclosed flares. Calabasas Landfill flares approximately 6,000 scfm of LFG containing 30 percent methane content. Project Development The South Coast Air Quality Management District gave LACSD ten Capstone C30s in February 2002 (the SCAQMD endorses the use of microturbines manufactured by Capstone Turbine and, in fact, has dedicated $8 million of its own funds to deploy Capstone MicroTurbines in its Southern California service territory). Calabasas Landfill has a relatively large motor load at its flare station. Served by Southern California Edison, the landfill saw a major increase in its monthly power cost in June 2001 when California investor-owned utilities implemented significantly higher rates that remain in place today. SCAQMD's offer of free equipment coupled with the onsite power requirement and radical increase in its monthly utility costs motivated LACSD to proceed with a microturbine project at Calabasas. While the availability of free generating equipment was an overriding factor in technology selection, the characteristics of the project favored microturbines over reciprocating engines and other onsite power technologies: • the onsite power load was relatively low; • the methane content of the landfill gas was low (conventional technologies would necessitate Btu “sweetening” with purchased natural gas or propane); and • very low NOx emissions were desired. LACSD selected SCS Energy to provide turnkey installation of the microturbines. LACSD issued SCS Energy a purchase order on March 14, 2002, and the array first produced power just five months later. SCS Energy secured a California Energy Commission grant for this project in the amount of $75,000. LACSD prepared an interconnection application for the project; the application was submitted on February 15, 2002, which was approved by SCE five months later (Capstone microturbines are now state-certified to the “Rule 21”

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MICROTURBINE OPERATING EXPERIENCE AT LANDFILLS

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