We are primarily tasked with providing power transmission services, system services and facilitating the energy market. Our core tasks follow from our appointment as grid operator under the Dutch 'Elektriciteitswet' (E-wet) and the German 'Energiewirtschaftsgesetz' (EnWG).
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Innovation
TenneT presents Hub and Spoke concept for large scale wind energy on the North Sea.
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TenneT manages the high-voltage grid in the Netherlands and large parts of Germany. TenneT transmits electricity at 110,000 volts (110 kV) and higher. With around 23,000 kilometres of high-voltage lines, we cross borders and connect countries.
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Our vision is to be one of the most transparent Transmission System Operators (TSO) in Europe and thereby creating value for society. In this Energy Insights section we present selected energy related topics and show data, information and valuable insights.
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TenneT is a leading European electricity transmission system operator (TSO), with activities in the Netherlands and in Germany. We strive to ensure a reliable and uninterrupted supply of electricity in our high-voltage grid for some 41 million people.
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DolWin2
Grid connection with the world's most powerful offshore converter platform
Facts
Connection
- 135 km long and 916 MW capacity
- 90 km onshore cable
- 45 km offshore cable
Grid connection point
- converter station Dörpen/West
Status of project
- online since spring 2016
About the project
Since 2016, three wind farms - Gode Wind 1, Gode Wind 2 and Nordsee One - have been connected to the transmission grid via the 135-kilometer DolWin2 direct current connection. In addition to 45 kilometres of submarine cable, TenneT also laid 90 kilometres of land cable, which run from the coast to the onshore converter station Dörpen West in Emsland. There, the direct current is converted back into three-phase current, fed into the transmission grid by the transformer station and redistributed to consumption-intensive regions. With a transmission capacity of 916 megawatts (MW), DolWin2 can supply more than one million households with clean wind energy per year.
DolWin beta, the heart of the DolWin2 grid connection, is currently the most powerful offshore converter platform in the world. For DolWin beta, TenneT opted for an innovative installation concept: the platform was anchored to the seabed by gravity alone. This design simplified the installation of the offshore converter platform, as it meant that no piles had to be driven into the seabed and no crane ship was required. To stabilize the platform, water was slowly pumped into the six steel legs during installation, causing it to sink to the seabed. Subsequently, the water in the steel legs was replaced by gravel and sand to fix the platform permanently. DolWin beta thus defies the harsh North Sea conditions and is always calm in the water even in strong waves.
Cornelia Junge
Press Referent - Project Communication Offshore
0049 (0)5132 89-2357
cornelia.junge(at)tennet.eu