The supply of renewable energies fluctuates enormously: wind turbines do not deliver electricity when the wind is down and solar roofs do not when it gets dark. So far, coal and nuclear power plants have borne the base and medium loads, but because of their poor controllability they do not match wind and solar power. “A further expansion of renewable energies is therefore not possible without electricity storage,” explains Geisler.

The principle of his invention is simple: When demand is low, compressed air is stored in pipelines via an electrically driven compressor. If the demand for electricity rises again, this compressed air is fed into a turbine in order to finally generate electricity via a generator and to deliver it to the grid.

The process is not new, but Geisler has improved it at crucial points: When the air is compressed, heat is generated, which Geisler stores separately from the compressed air. “It can be recovered to a large extent by expanding in a turbine generator that feeds electricity into the grid. The residual heat goes into the district heating network. ”The efficiency is thus significantly higher than that of a hydrogen fuel cell.

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