Swissgrid is having to intervene more and more frequently to ensure that parts of the transmission grid are not overloaded.

Laying new underground cables in the Swiss transmission grid only remains possible to a very limited extent. This is the result of the Swissgrid cable study, which shows that the physical properties of underground cables make stable grid operation and the rectification of disturbances much more difficult.

The proportion of renewable energies in Switzerland is increasing every year, with the largest growth coming from photovoltaic plants. However, solar power production depends on the weather and is very volatile. That is why data and forecasts need to be as accurate and up to date as possible to ensure the secure and stable operation of the transmission grid. Yet the quality of data and forecasts has been lagging behind the expansion of photovoltaic plants for some years now, leading to an urgent need for innovation.

Andreas Schreiber and Zuzana Filková explain why a stable grid shouldn’t be taken for granted in the future, the challenges Swissgrid is facing, and what the tariffs comprise.

The Lachmatt substation in Pratteln is being modernised to meet the increasing electricity requirements in the Basel region. A new 380-kV switchgear and a coupling transformer will increase security of supply in the Basel region in the future and facilitate international electricity exchange with Germany and France. Protecting the environment is a high priority during the construction work.

When it comes to regional grid coordination for the grid of the future, 1 plus 1 is more than 2: thanks to synergies, a better grid with fewer line routes is being created.

Swissgrid is opting for drone technology for inspecting overhead lines. This technology will further optimise the maintenance of the transmission grid and drive forward the digitalisation of grid inspections.

Operating the grid is a balancing act to keep the consumption and generation of electricity constantly in equilibrium. Swissgrid uses control energy to maintain the necessary balance. Photovoltaic plants will also help to stabilise the grid in the future.

The Court of Justice of the European Union (CJEU) has ruled in favour of Swissgrid in the proceedings concerning participation in the TERRE control energy platform.