In a current test set-up at Hamburg Bergedorf dubbed ‘future energy solution’ (FES), scientists from the TUHH Institute for Thermofluid Dynamics are converting excess wind energy into heat they store in a rock-fill that is protected with an insulated cover.

When there is a need for additional electricity, a steam turbine converts the heat energy back to power.

“The technology of our FES store deliberately uses mainly tried and trusted technology,” says Till Barmeier, Siemens’ project manager.

“Because we are working here with tested thermal components and a series-ready steam turbine, we will be able to offer a practical solution within a few years.