SeasON Energy raises single-digit millions for seasonal energy storage
What's the deal? Swiss cleantech startup SeasON Energy has closed an early-stage funding round, with a private investor taking a stake in the company for a single-digit million sum. The Zurich-based startup, founded in 2025, develops thermochemical storage that captures summer solar energy for winter heating.
What's the endgame? SeasON Energy has built a sorption heat pump based on caustic soda. Charged in summer via solar thermal or photovoltaic systems, the store releases energy in winter to heat buildings — from single-family homes to industry and district heating.
Why now? The financing lets the eight-person team push its market entry and install the first five to 10 storage units next year. Two pilot plants are already running under real conditions; a third is finished and set to start shortly, with zero-series production planned for 2027.
Where's the market? SeasON Energy is focusing first on the DACH region — Switzerland, Germany, and Austria. Chief executive officer Marc Lüthi says the company fielded over 300 concrete project enquiries from the region in the past 18 months, and is planning a first plant in northern Germany with a large German real estate firm.
A spin-off of MaticaDealroom has a profile for this one. Try Dealroom → AG and Lucerne University of Applied Sciences, the startup builds its first production lines inside Matica's halls. "This gives us the flexibility to build up manufacturing expertise step by step and develop production further," Lüthi said. Separately, InnosuisseDealroom has a profile for this one. Try Dealroom → has approved a research project with the university, backed by a CHF 572,688 grant to develop a low-pressure steam compressor that should boost the system's efficiency.
The signal: Long-term, cost-efficient storage of renewables is one of the central hurdles on the path to net zero. SeasON Energy is betting seasonal thermochemical storage can bridge the summer-winter gap — and its pipeline, including a project with a large retailer on storing waste heat from cooling, suggests demand well beyond home heating.
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