Vattenfall to build Germany’s largest heat accumulator


Sweden’s state-owned energy company Vattenfall has announced that it is building Germany’s largest heat accumulator and storage system at its Reuter West CHP plant in Berlin, with the aim of making a significant contribution to the country’s energy security as it races to wean itself off Russian gas.

At 45 meters high, with a diameter of 43 meters and a capacity of 56 million liters, the heat accumulator will store district heating water at a temperature of 98°C. Together with its power-to-heat plant – which is the largest in Europe – and sits next to the power plant site, the heat storage will help to increase the use of surplus renewable energy from the grid.

The heat accumulator is set to be commissioned at the start of 2023 and it should take two months to fill the hot water tank with a volume of water equivalent to 350,000 bathtubs.

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