There would actually be enough energy if the sun could be used as a virtually unlimited source of energy. But most of the sun's energy comes in the summer, and we would need it in the winter. That's when we want to heat, because the sun doesn't shine.

"Seasonal storage is the crux of the energy transition", Michel Haller says. It has long been possible to produce solar power cost-effectively and competitively; next year, electricity from the grid will cost him almost 30 centimes per kilowatt hour, while the amortisation of the solar system on his own roof will cost eleven centimes per kilowatt hour.

"Electricity from my solar system is cheaper, but it only comes during the day, and it comes less in winter. Balancing from day to night is not that difficult," says the researcher, "but shifting from summer to winter with reasonable costs, we still have a problem there". A problem for which Michel Haller has an exciting solution.

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