Siemens wins first order for Flex-Plant 10 combined cycle plants

9 September 2010


Siemens Energy has been awarded its first order for the supply of two SCC6-5000F Flex-Plant 10 combined cycle power islands from the U.S. power company NRG Energy. The plant, in El Segundo, California, will employ what Siemens calls "an advanced design offering an environmentally compatible solution for the peaking to intermediate market through fast-start technology, and low start-up emissions and water usage." The Flex-Plant 10 unit can ramp up to an output of 300 MW within 10 minutes. The plant is scheduled to come online in the spring of 2013.

At the heart of the Flex-Plant 10 is the SGT6-5000F gas turbine, integrated with a single-pressure, non-reheat bottoming cycle. Together with an air-cooled heat exchanger for steam condensing, the unit achieves a net efficiency of nearly 49 %, making it, says Siemens, the most efficient peaking plant technology available today. It makes a very competitive offering in the peak- to intermediate-duty cycles, including the10-minute non-spinning reserve market.

The natural gas-fuelled plant in El Segundo will have a nominal rating of 560 MW. The Siemens scope of supply includes the main power island components – each featuring a SGT6-5000F gas turbine-generator, an SST-800 steam turbine-generator, a heat recovery steam generator and an air-cooled condenser – along with the complete electrical and power plant instrumentation and control systems. Siemens also will provide the engineering services and commissioning of the plant.

"Our Flex-Plant peakers are specifically designed to meet the U.S. market needs for extremely short start-up times and delivery of high efficiency and low emissions." says Michael Suess, CEO of the Fossil Power Generation division at Siemens Energy.




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