Startup · Finland
TheStorage
HQ Tampere, FinlandFounded 20231-10 employeesUpdated
Renewable energy sources are intermittent by nature.
Funding3 rounds · ~$6.5M
- Equity raised
- ~$6.5M
- Latest
- ~$4.2MSeed · Apr 23, 2026
| Announced | Stage | Amount | Valuation | Lead investors | Other investors | Confidence |
|---|---|---|---|---|---|---|
| Apr 23, 2026 | Seed | ~$4.2M | — | Voima Ventures | — | Reported |
| Feb 25, 2025 | Seed | ~$1.2M | — | — | — | Reported |
| Oct 17, 2024 | Pre-Seed | ~$1.1M | — | 2C Ventures | — | Reported |
- SeedLed by Voima Ventures~$4.2MApr 23, 2026
- Seed~$1.2MFeb 25, 2025
- Pre-SeedLed by 2C Ventures~$1.1MOct 17, 2024
Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.
Systems1
- Sand-in-Motion Thermal Energy StorageA sand-based thermal energy storage system for industrial heat, demonstrated in a brewery pilot.
Newest unveiled first. Systems that belong to a government program link to the program page, where variants, costs and contracts are.
Capabilities1
| Technology | Role | Maturity | TRL | Notes | Confidence |
|---|---|---|---|---|---|
| Power, grids and energy storage | Developer | — | — | classify_sectors run 37, haiku, taxonomy 2026-10-18b: Stores renewable electricity as high-temperature heat in sand for industrial customers; no defense or government use stated. | Reported |
- Developerclassify_sectors run 37, haiku, taxonomy 2026-10-18b: Stores renewable electricity as high-temperature heat in sand for industrial customers; no defense or government use stated.—Reported
Maturity and TRL describe this organization's work; the field-wide maturity is on each technology's page.
People2
| Person | Role |
|---|---|
| Esko Kulju | Co-Founder & Project Manager |
| Timo Siukkola | chief executive officer and co-founder |
Sources5
Profile2
- 1
Sixth-Domain · Supports Organization · country, Organization · kind
“{"country": "Finland", "hq_iso2": "FI", "id": "683aa270-ffe0-4a33-8659-c629d481d588"}”
- 2CompanyTheStorage
TheStorage · Supports Organization · description, Organization · name, Organization · website
“Renewable energy sources are intermittent by nature. TheStorage acts as a reliable buffer between renewables and industries by providing constant energy. Clean electricity is turned into heat and stored in sand at high temperatures.”
Systems1
- 3CompanyOur Technology - TheStorage
TheStorage · Supports System
“# TheStorage system uses two insulated silos, an electric heater, a proprietary heat exchanger - and plenty of sand”
Funding1
- 4DatabaseTheStorage company profile
Octen Business Search · Supports Funding round, Organization · employee range, Organization · founded year, Organization · hq city, Organization · hq region, Organization · linkedin url, Organization · ownership, Role
“funding round: Seed Round, 2026-04-23, EUR 3,600,000, lead: Voima Ventures”
People1
- 5
ctrlaltwin.org · Supports Role
“Timo Siukkola, chief executive officer and co-founder of TheStorage, emphasized that the current global energy market provides no remaining justification for industrial sectors to maintain their historical reliance on fossil fuels, given the proven economic viability and superior heat transfer capab”
Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.