Fourth Power
Energy Storage that Grows with the Grid
35 employees · est. 2021 · Cambridge, United States
Terra One
AI-controlled battery storage for a resilient, independent Europe.
58 employees · est. 2023 · Berlin, Germany
Fourth Power is the older company (2021 vs 2023); Terra One is the larger of the two.
Side-by-Side Comparison
| Metric | Fourth Power | Terra One |
|---|---|---|
| Founded | ||
| Founded | 2021 older | 2023 |
| Headquarters | ||
| Headquarters | Cambridge, United States | Berlin, Germany |
| Employees | ||
| Employees | 35 | 58 larger |
| Industry | ||
| Industry | Energy, Renewable Energy, Energy Storage | Not tracked yet |
| Funding Stage | ||
| Funding Stage | Series A | Seed |
| Total Funding | ||
| Total Funding | $19.00M | $312.40M |
| Funding Rounds | ||
| Funding Rounds | 1 | 4 |
| Services | ||
| Services | Thermal energy storage systems, Utility-scale energy solutions, Flexible grid-scale storage solutions | Batteriespeicherentwicklung, AI-gesteuerte Energiemanagementlösungen, Projektentwicklung und Bau, Autonome Energiehandelsplattform, Energieoptimierung und Vermarktung, Großbatteriespeicher-Technologien |
| Target Customers | ||
| Target Customers | Utility companies, Energy infrastructure developers, Renewable energy sectors, Government energy agencies | Flächeneigentümer, Netzbetreiber, Gemeinden, Energieunternehmen, Investoren in Energietechnologien |
| Taxonomy | ||
| Taxonomy | Thermal Battery, Energy Storage, Grid Storage, Thermal Storage, Utility-Scale Storage, Long-Duration Energy Storage, Industrial Heat, Clean Energy, Modular Battery, On-Demand Energy, Cost-Competitive, Wind Energy, Solar Energy, Fossil Fuel Alternative | AI-Controlled Battery Storage, Climate Neutrality, Energy Storage Solutions, Grid Stabilization, Renewable Energy Integration, Algorithmic Power Trading, Machine Learning Architecture, Grid-Scale Storage Projects, Energy Asset Management, Autonomous Battery Operation, Power Grid Infrastructure, Clean Energy Availability, Partnership With Communities, Energy Transition, Climate Tech |
| Website | ||
| Website | gofourth.com | terra.one |
About Fourth Power
Fourth Power is making significant strides in the energy sector with its innovative thermal battery technology. Founded in 2021 and headquartered in the United States, the company focuses on transforming renewable energy into an on-demand source via utility-scale thermal storage. These technological...
About Terra One
Terra One, established in 2023 and headquartered in Germany, is positioned at the forefront of Europe's transition to climate neutrality. Their innovative slogan, "AI-controlled battery storage for a resilient, independent Europe," reflects their commitment to transforming energy infrastructure thro...
We will tell you when either one moves
BounceWatch watches Fourth Power and Terra One for new funding, fast hiring, new executives and a change of software vendor. When one happens, we email you the same day.
Funding, hiring, leadership and stack changes at Fourth Power and Terra One — by email.
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Compiled from the BounceWatch company index. We last looked at Fourth Power on 18 Aug 2025, and Terra One on 28 May 2026. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.