We operate the transmission grid in northern and eastern Germany and secure the electricity supply for around 18 million people. The 50Hertz extra high voltage grid has a circuit length of about 10,200 kilometers – that is the distance from Berlin to Rio de Janeiro. 50Hertz maintains lines, cables and substations through efficiently maintenance, expands its grid to meet demand and ensure the electrical balance between energy consumers and power generators. 50Hertz is a leader in the secure integration of renewable energies: More than half of the annual average consumption in our grid area comes from renewable sources - and it is constantly growing. Around 1,100 employees at ten locations ensure that electricity flows around the clock in Berlin, Brandenburg, Hamburg, Mecklenburg-Western Pomerania, Saxony, Saxony-Anhalt and Thuringia. Like traffic, electricity flows across borders. The 50Hertz transmission grid is part of the European interconnected grid and is directly connected to neighbouring countries Poland, the Czech Republic, Denmark and in the near future also Sweden.
We ensure stability.
We promote the integration of renewable energies.
We strongly facilitate the electricity market.
We are realising the grid of the future.
We are connected with Europe.
The rising demand for energy and the need to bridge increasing distances have over the decades required ever higher transmission voltages. Employing a range of voltages allows transport to be handled with a minimum of loss and maximum economic efficiency. High voltages are needed to bridge long distances and minimise transport losses. At the highest level, the supra-regional transmission grid, electricity is transmitted at extra-high voltages of 380 kV or 220 kV, across long distances from large-scale power plants connected to the extra-high-voltage system to centres of electricity use – including to European neighbours. The second level includes the distribution system operators of the regional electricity companies. They distribute electricity at a voltage of 110 kV in relatively large areas, where it is fed into the local networks: the low-voltage system. The various voltage levels are connected to one another via substations. Here, the voltage is transformed to higher or lower voltages.
The energy transition will not just happen by itself. It is only possible if we actively work towards it. If we maintain a dialogue with all the players involved to openly discuss the challenges of grid expansion. If we offer a reliable infrastructure that reacts flexibly to fluctuations in supply and demand. And if we make our decisions considering our customer’s perspective. Then we can look forward to a successful energy transition for a sustainable world.
50Hertz primarily transmits the energy in its grid using alternating current. This current changes its flow direction 100 times per second. In technical terms, the current oscillates at a frequency of 50 hertz. Fluctuations in electricity generation and consumption have an impact on the frequency. The frequency falls if there is a power deficit and increases if there is a power surplus. To ensure that the frequency is always in the range of 49.8 and 50.2 hertz, we constantly balance the oscillations. In doing so, we always keep the system stable.