Norway’s solid-state hydrogen storage could store summer solar energy for winter use

The technology converts renewable electricity into hydrogen for long-term seasonal storage.

Norwegian startup Photoncycle has raised $17.5M to develop a seasonal energy storage system that could allow homes to store excess solar energy from summer and use it in winter.

The system converts renewable electricity into hydrogen and stores it in solid-state form at the household level, tackling one of the biggest challenges for renewables — long-duration seasonal storage. The company plans to roll it out commercially in Denmark and the Netherlands.

The funding will support the first phase of an industrial plant expected to go live in 2027, with capacity to provide seasonal storage for about 140,000 homes.

Photoncycle says the technology could reduce reliance on imported fossil fuels and help households become more energy independent.

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