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).
The expansion of wind energy plants has greatly increased since the entry into force of the Renewable Energy Act in 2000, and more and more electricity from wind power is being fed into the grids. But already today, the high-voltage grids of TenneT TSO GmbH are approaching their capacity limits in some regions.
Background of feed-in management
Pursuant to § 14 EEG, grid operators are authorized to regulate, by way of exception and irrespective of their obligation according to § 12, systems and CHP plants connected to their grid, directly or indirectly, which are equipped with a facility to remotely control the reduction of the feed-in power in case of grid overload within the meaning of § 9 para 1 number 1, para 2 number 1 or 2 letter a, insofar as
- a bottleneck would otherwise occur in the respective grid, including the upstream grid,
- priority is given to electricity produced from renewable energy sources, mine gas and combined heat and power generation, unless other plants must remain on the grid to generate electricity in order to ensure the security and reliability of the electricity supply system, and
- they have obtained the data available on the actual power supply in the respective region of the grid.
The objective of the legislation is to integrate as high a proportion as possible of power from renewable sources, mine gas or combined heat and power generation into the grid while maintaining grid security, and not to interfere with the legally prescribed, immediate grid expansion while doing so.
Therefore, TenneT has taken some substantial grid reinforcement measures in Schleswig-Holstein and Lower Saxony.