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).
Our key tasks
Innovation
TenneT presents Hub and Spoke concept for large scale wind energy on the North Sea.
Read moreOur grid
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.
Electricity market
The energy sector is developing rapidly. The process of European market integration began some years ago. Its purpose is to create a single European market that enables market parties to trade gas and electricity across national borders easily and efficiently.
Transparency data
We provide transparency data on our operations on our Dutch and German transparency page and on ENTSO-E.
To transparency pagesE-Insights
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.
Company
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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Riffgat
Three-phase grid connection off the coast of Borkum
Facts
Connection
- 80 km long and 113 MW capacity
- 30 km onshore cable
- 50 km offshore cable
Grid connection point
- substation Emden/Borßum (220 kV)
Status of project
- in operation since February 2014
About the project
After alpha ventus, Riffgat is the second offshore grid connection that TenneT has connected to the transmission grid using three-phase current technology. The wind farm of the same name is located within the twelve nautical mile zone of Lower Saxony, about 15 kilometers northwest of the East Frisian island of Borkum and thus about 50 kilometers from the coast. Due to the proximity to the mainland and the installed total output of 113 megawatts (MW), it was technically and economically most efficient to realize Riffgat as an individual three-phase current connection.
The 80 kilometer 155 kilovolt connection (kV) will be connected to the 220 kV grid via the Emden/Borßum substation. The existing transformer station was extended accordingly. Since February 2014, power capacities of up to 113 megawatts (MW) have been fed into the German power grid via 50 kilometers of submarine and 30 kilometers of land cable. Laying the undersea cable off the coast of Borkum was technically extremely demanding, as the route led along a dumping area for World War II ammunition. For more than 18 months, 30 tons of ammunition had to be recovered and disposed of with the utmost care and effort before the grid connection could go into operation.
