Polar Night Energy
'Sand battery' — high-temperature seasonal heat storage in sand, charged with cheap renewable electricity and discharged as heat into district heating and industrial processes. Founded in 2018 by Tommi Eronen and Markku Ylönen, who met studying at Tampere Univ. of Technology; the first prototype was built in the backyard of Eronen's grandparents' cottage as part of a project they called the 'Hippie Commune', asking whether a community could run on solar power alone.
The row
- Stage
- In market — Product is being sold
- Location
- Tampere
- Founded
- 2018
- Business ID
- 2910933-3 · Finnish trade register
- Funding
- €7.6M (2024) (seed)
Links
Where this sits on the map
Polar Night Energy is one of 32 companies in Energy, Climate & Environment. The others:
How this row was decided
Every row on this map is checked by hand against the trade register and the company's own material, and placed in the sector that best describes its business or its technology. Service firms and consultancies are left out, however advanced the technology they work with — the test is where the revenue comes from. Only funding figures the company or its investor has published are shown. The full rules are on the landscape ↗