Fourth Power
Energy Storage that Grows with the Grid
35 employees · est. 2021 · Cambridge, United States
KRAFTBLOCK is the older company (2021 vs 2014).
Side-by-Side Comparison
| Metric | Fourth Power | KRAFTBLOCK |
|---|---|---|
| Founded | ||
| Founded | 2021 | 2014 older |
| Headquarters | ||
| Headquarters | Cambridge, United States | Germany |
| Employees | ||
| Employees | 35 | 44 |
| Industry | ||
| Industry | Energy, Renewable Energy, Energy Storage | ESG, Energy, Renewable Energy |
| Funding Stage | ||
| Funding Stage | Series A | Series B |
| Total Funding | ||
| Total Funding | $19.00M | $32.09M |
| Funding Rounds | ||
| Funding Rounds | 1 | 9 |
| Services | ||
| Services | Thermal energy storage systems, Utility-scale energy solutions, Flexible grid-scale storage solutions | Thermal Storage Systems, Energy Security Solutions, Custom Solutions for Industry Transition, Project Planning and Execution, Feasibility Studies |
| Target Customers | ||
| Target Customers | Utility companies, Energy infrastructure developers, Renewable energy sectors, Government energy agencies | Steel & Metal Industries, Pulp & Paper Industry, Energy & Utility Sector, Glass & Ceramics Industries, Food, Beverages & Pharmaceuticals, Chemical Industry, Oil & Gas Industries |
| 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 | Energy Storage, Decarbonization, Industrial Heating, Thermal Energy, Upcycled Materials, Sustainable Technology, Modular Systems, Mobile Energy Storage, Waste Heat Utilization, Emission Reduction, High-temperature Storage, Climate Solutions, Industrial Applications, Energy Transition |
| Website | ||
| Website | gofourth.com | kraftblock.com |
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 KRAFTBLOCK
KRAFTBLOCK is at the forefront of revolutionizing the energy storage landscape, targeting heavy industries such as steel, glass, ceramics, food, chemicals, and paper with a unique sustainable solution. Founded in 2014 and headquartered in Germany, the company is enthusiastic about decarbonizing indu...
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Compiled from the BounceWatch company index. We last looked at Fourth Power on 18 Aug 2025, and KRAFTBLOCK on 17 Jun 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.