Siemens Gamesa introduces new wind turbines, confirms Vattenfall offshore choice

Siemens Gamesa's SG 8.0-167 DD offshore wind turbine. Image source: Ørsted

November 29 (Renewables Now) - Siemens Gamesa Renewable Energy SA (BME:SGRE) on Tuesday unveiled two new turbine models, including one for offshore wind farms that will be used as part of projects by Scandinavian energy groups Ørsted A/S (CPH:ORSTED) and Vattenfall AB.

Siemens Gamesa presented the new geared turbine SG 4.2-145 for onshore wind parks at sites with medium wind speeds. It is part of the company’s new geared turbine platform Siemens Gamesa 4.X. Rated at 4.2 MW, the machine features a 145-metre (475.7-ft) rotor. Compared to the model G132-3.465 MW, the SG 4.2-145 offers an increased swept area of 21%, which improves annual energy production by more than 21%, according to the announcement.

The company plans to install a prototype of the SG 4.2-145 in the autumn of 2018, while certification is expected in 2019. The start of production is scheduled for early 2019.

Also on Tuesday, Siemens Gamesa introduced the the new direct drive offshore wind turbine SG 8.0-167 DD, with a rotor diameter of 167 metres. The new machine is based on the SWT-7.0-154 model, reusing most of its components apart from the rotor, which has been upgraded. The blades of the SG 8.0-167 DD will allow for an 18% greater swept area and up to 20% higher annual energy production than its predecessor.

The company installed and commissioned the first prototype in the 8-MW class in Oesterild, Denmark, at the start of the year. It now plans to erect an additional SG 8.0-167 DD prototype there next year to test its blades.

Siemens Gamesa anticipates that the SG 8.0-167 DD will be market-ready in 2020. It will work together with Fraunhofer IWES in Bremerhaven, Germany, to test the nacelle of the turbine in the institute’s Dynamic Nacelle Testing Laboratory (DyNaLab). The programme, which includes load simulations and grid compliance tests, will begin in the spring and will be concluded by the end of 2018.

Swedish state-owned utility Vattenfall has already placed a conditional order for a total of 113 units of the new offshore wind turbines for projects in Danish waters. A total of 41 units will be installed as part of the 180-MW Vesterhav North and 170-MW Vesterhav South nearshore projects at the west-coast of Denmark in the North Sea. Furthermore, Vattenfall plans to use 72 SG 8.0-167 DD turbines for the 600-MW Kriegers Flak offshore wind park in the Baltic Sea. The company expects to take a final Investment decision for the three projects in the fourth quarter of 2018.

The same turbine model was also chosen by Denmark's Ørsted, formerly Dong Energy, for its 752-MW Borssele 1&2 project, which is seen to be fully operational by the end of 2020.

Siemens Gamesa noted that by 2020 it will end up providing only geared solutions in the onshore segment, and direct-drive turbines for offshore installations. "The single platform strategy helps the company to transition to a more focused offer in the medium-term by utilizing economies of scale throughout the supply chain,” said CEO Markus Tacke.

The company added it is currently developing further onshore models for high and low-wind sites with rotor diameters of 132 metres and above 150 metres.

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