Siemens completes two CCGT power plants in the Netherlands


Siemens Energy (NYSE: SI) has completed the Hemweg 9 and Diemen 34 combined-cycle gas turbine power (CCGT) plants in the Netherlands. The customer is the Dutch utility Nuon, part of Vattenfall. Siemens constructed the two power plants as turnkey projects. Each plant is equipped with an F-Class gas turbine and has an electrical output of around 440 MW with an efficiency of almost 60 percent. The Diemen 34 power plant also produces about 260 MWth (thermal megawatts) of district heat for Amsterdam. This increases the maximum efficiency to 85 percent. The two plants are ideally suited to compensate for the fluctuating feed-in of renewables.

Hemweg 9 is in the Westport district to the west of Amsterdam's center. It replaces the Hemweg 7 power plant that was shut down at the end of 2012 and significantly reduces CO2- and nitrogen oxide emissions. Diemen 34 is located to the east of Amsterdam about fifteen kilometers from Hemweg. In addition to turnkey construction, Siemens supplied each plant with an SGT5-4000F gas turbine, an SST5-5000 steam turbine, a hydrogen-cooled SGen5-2000H generator, the complete electrical equipment, and an SPPA-T3000 I&C system. The Hemweg 9 power plant was completed before the contractually agreed date with excellent results concerning performance, efficiency and safety during execution. Since the middle of 2012 both power plants delivered their first electricity to the Dutch power grid.

"The two highly modern combined cycle power plants that we've constructed in Amsterdam provide our customers with numerous economic advantages," says Lothar Balling, head of Gas Turbine Power Plant Solutions at Siemens Energy. "Their high efficiency makes it possible to produce more electricity from the same amount of fuel. The district heat extraction assures our customer of additional revenue and the extreme service friendliness of our equipment minimizes maintenance-related production losses. Thanks to the SGT5-4000F gas turbine's operating experience of over 7,6 million equivalent hours of operation, both power plants are also exceptionally reliable."

The electrical capacity of Hemweg 9 is 440 MW. Diemen 34 has an electrical capacity of 435 MW and a thermal capacity of 260 MW. Hemweg 9 was designed to permit retrofitting with district heating at a later date. Both power plants achieve an efficiency of 59.8 percent and exceed contractually agreed values in terms of output and efficiency. Both power plants are configured as single-shaft units in which the gas and steam turbines are arranged on one shaft and drive the same generator. Such plants offer economic advantages thanks to lower investment costs along with a high degree of operating flexibility.

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