# Fourth Power

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/fourth-power

- Industry: Renewable Energy
- Headquarters: Cambridge, US
- Website: www.gofourth.com
- Total disclosed funding: $39M
- Latest round: Series A (Sep 16, 2025)
- Investors on record: 4

## About

Based in Massachusetts, US, and founded in 2021, Fourth Power Inc. operates as a renewable energy company that develops thermal battery technology. The company was founded by its CTO Asegun Henry. In September 2025, Fourth Power, Inc. raised USD 20 million in series A funding led by investor Munich Re Ventures, with participation from another investors Data Collective and Breakthrough Energy Ventures also participated in the round.

The thermal battery energy storage company offers utility-scale thermal battery solutions that store renewable energy as heat for short and extended periods of time, allowing electricity to be dispatched to the grid in seconds. The firm converts renewable energy to heat, or thermal energy, which can be stored until needed.

Fourth Power generates revenue through the sale and deployment of its thermal energy storage systems to utilities and large-scale energy providers. Its cost advantage less than USD25 per kWh for storage and under USD 1 per watt for delivery positions the company competitively against lithium-ion batteries and natural gas alternatives.

The company will use the September 2025 funding to commission a 1 MWh-e demonstration using full-scale commercial components.

## Funding rounds

- Series A, Sep 16, 2025, $20M — DCVC, Breakthrough Energy Ventures, Munich Re Ventures
- Series A, Dec 12, 2023, $19M — DCVC, Breakthrough Energy Ventures, BVCC Corporation

## Investors

- DCVC (https://capitalatlas.ai/funds/dcvc) — Series A
- Breakthrough Energy Ventures (https://capitalatlas.ai/funds/breakthrough-energy-ventures) — Series A
- BVCC Corporation — Series A
- Munich Re Ventures (https://capitalatlas.ai/funds/munich-re-ventures) — Series A