Battolyser Systems (€40M Debt Financing for developing integrated rechargeable battery and electrolyser system to store renewable energy)

Battolyser Systems, a Dutch cleantech startup founded in 2021, develops an integrated battery and electrolyser system known as the battolyser. The battolyser is charged when there is a surplus of renewable electricity. When the battery is full, the surplus of energy produces hydrogen and oxygen for energy storage. It can maximize the wind and solar energy captured.

Challenges: energy storage

The unpredictability and intermittent nature of renewable energy sources such as wind and solar is one of their greatest obstacles. For example, solar energy can produce an excess of electricity during the day and summer, but the supply decreases at night and during the winter.

Conventional batteries, such as those based on lithium, can store energy in the short-term, but when they’re fully charged they must release any excess or they will overheat and degrade. The green hydrogen production from water electrolysis powered by renewable energy may enable long-term energy storage in fuels and feedstock via chemical processes such as the Sabatier (methane from H₂ and CO₂), Haber-Bosch (ammonia synthesis from clean H₂ and N₂), and Fischer- Tropsch (alkanes from CO/CO₂ and H₂) process.

Thereby, the storage infrastructure should provide for these different requirements throughout the year and support the ‘storage merit order’ of first efficient battery storage, followed by less efficient fuel production, storage, and conversion. Alkaline electrolysers coupled with batteries are prevalent in the hydrogen-producing industry and can perform this function.

Battolyser Systems Technology

Battolyser Systems developed a low-cost, durable battolyser that integrates the functions of rechargeable battery and alkaline electrolyser. The battolyser provides electricity storage capacity, which is charged when there is a surplus of renewable electricity and discharged when there is an electricity deficiency. When the battery reaches its maximum capacity, hydrogen is produced from the excess electricity that exceeds the battery’s capacity. This makes the battolyser flexible with respect to energy insertion.

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