Siemens Energy has been awarded a contract from Northern California Power Agency (NCPA) for the supply of a Flex-Plant 30 power island. The 280-MW, natural gas-fired combined cycle power plant will be located in Lodi, California, U.S.A. and will generate highly efficient and environmentally friendly power. The Flex-Plant 30 concept is unique because of its fast-start capability designed to deliver approximately 200 MW of power to the grid within only 30 minutes. These short start-up times reduce the emissions of the plant significantly. The order value is approximately US$140 million.

With an output of 280 MW, the power plant will serve the energy needs of 14 different project participants, including Modesto Irrigation District, Power and Water Resources Pooling Authority, Port of Oakland, Plumas-Sierra Rural Electric, State of California Department of Water Resources, Bay Area Rapid Transit, City of Ukiah, City of Lodi, City of Biggs, City of Azusa, City of Lompoc, City of Santa Clara, City of Healdsburg and the City of Gridley.

The SCC6-5000F single-shaft Flex-Plant 30 is a highly efficient combined cycle plant designed for intermediate to continuous duty that is capable of daily cycling at efficiencies of over 57 percent. Using the Siemens SGT6-5000F gas turbine as the prime mover, the plant will supply high power density while requiring a relatively small plant footprint. The Siemens SPPA-T3000 control system will provide an easy-to-use control platform for the entire combined cycle power plant. Additionally, the Siemens SST-900RH steam turbine, along with a Benson-style Heat Recovery Steam Generator (HRSG), facilitates fast start-up times, which leads to reduced emissions.

The Flex-Plant 30 technology allows for frequent starting or cycling of the power plant. Its start-up time of 30 minutes or less can result in a carbon monoxide reduction of over 200 tons per year when compared to standard F-class combined cycle plants, which will set a new standard for greenhouse gas emissions for gas-fired combined cycle power plants. Plant start-up times are reduced by up to 50% due to the integration of the following fast-start features, including the three-pressure reheat HRSG with Benson once-through technology, high capacity steam attemperation and full capacity steam bypass systems, innovative piping warm-up strategies, Siemens’ steam turbine stress controller (TSC), modern water treatment system and optimized plant stand-by using auxiliary steam to maintain vacuum.

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