Polar Night Energy
PrivateLast Round
Grant
Dec 10, 2024
Total Funding Raised
$11M
Company Overview
Polar Night Energy operates in Energy & Sustainability and is based in Tampere. Its latest recorded funding round was a Seed round in April 2024.
Polar Night Energy is a renewable energy company that designs and manufactures high-temperature, sand-based thermal energy storage systems to store surplus wind and solar energy as heat.
Sector
Energy & Sustainability
Verticals
Energy Storage, Renewable Energy, Energy Management
Business Model
B2B
Customer Profile
Hardware Sales, Services & Consulting
AI Layer
Non-AI
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Polar Night Energy Comparables
Compare Polar Night Energy with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Elstor Oy | 87% | |
| TheStorage | 86% | |
| Lumenion GmbH | 86% |
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Polar Night Energy Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Grant | Dec 10, 2024 | ||||
| Seed | Apr 3, 2024 | ||||
| Grant | Dec 12, 2023 | ||||
| Seed | Oct 13, 2021 |
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Key People
Founding team and executive leadership
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Polar Night Energy Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Business Finland | Grant |
| Holdix | Seed |
| PC Rettig & Co. Impact | Seed |
| Liquido Ventures | Seed |
| Stephen Industries Inc Oy | Seed |
Market signals
Structured signals derived from secondary market and firmographic data.
- Nov 27, 2025
Announced construction of an industrial-scale sand battery with 2MW heating power.
- Nov 27, 2025
Partnered with Lahti Energia to build an industrial-scale sand battery.
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Recent news
Latest coverage and updates
- partners_withOct 23, 2026
Polar Night Energy Oy partners with Bichura Energy through a signed MoU to explore deploying thermal energy storage technology in Mongolia, supporting energy transition, industrial development, and decarbonization efforts, in Finland on Oct 23rd '26.
- attends_eventOct 23, 2026
Polar Night Energy Oy attends the Finland-Mongolia Business Forum in Finland on Oct 23rd '26 and signs a Memorandum of Understanding with Bichura Energy.
- attends_eventSep 29, 2026
Polar Night Energy Oy is participating in ENERGY2026, the 8th edition of the Global Energy Conference, taking place online on Oct 6–7 '26; its Chief Commercial Officer, Annette Höglund-Dönnes, will speak in the Energy Startups to Watch track on Oct 6.
- recognized_asSep 21, 2026
Polar Night Energy Oy's Sand Battery was recognized as the Breakthrough of the Year in the 2026 ITU Technology Awards earlier in 2026, with the award presented by Academic Engineers and Architects in Finland TEK.
- attends_eventSep 21, 2026
Polar Night Energy Oy’s CTO, Markku Ylönen, will present the company’s Sand Battery technology at TEK’s Finnish-language energy storage seminar in Tampere, Finland, on Nov 10th '26.
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Polar Night Energy Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
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Frequently Asked Questions
Common questions about Polar Night Energy's valuation, stock price, and market status.
Is Polar Night Energy a public or private company?
Polar Night Energy is a private company.
What is the current stock price of Polar Night Energy?
Polar Night Energy is a private company, so its shares have no public market price. Caplight tracks Polar Night Energy's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Polar Night Energy worth (valuation)?
Valuation information for Polar Night Energy is not publicly available.
Can I buy Polar Night Energy stock?
Polar Night Energy shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Polar Night Energy's last funding round?
Polar Night Energy's most recent funding round was Grant on December 10, 2024.
Who are the main investors in Polar Night Energy?
Key investors in Polar Night Energy include Liquido Ventures.
Will Polar Night Energy IPO soon?
No public IPO plans have been announced for Polar Night Energy.
How can I track Polar Night Energy secondary market activity?
Caplight tracks bids, offers, and trades in Polar Night Energy's shares on secondary markets.