Fourth Power
Latest round
- Series A
Last raised
- Sep 2025
Total raised
- $39M
Investors
- 4
About Fourth Power
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. 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.
Who invested in Fourth Power
4 investors across 2 rounds
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Questions about Fourth Power
Who invested in Fourth Power?
Fourth Power has 4 investors on record across 2 venture rounds. Sign up free to see every VC on the cap table and the rounds they joined.
How much funding has Fourth Power raised?
Fourth Power has raised 2 venture rounds. Sign up free to see how much each round raised and the total.
When did Fourth Power last raise money?
Fourth Power's most recent round on record is a Series A, in Sep 2025.
What does Fourth Power do?
Based in Massachusetts, US, and founded in 2021, Fourth Power Inc.
Where is Fourth Power headquartered?
Fourth Power is headquartered in Cambridge, US.
Which VCs invest in companies like Fourth Power?
Among active investors with capital left to deploy, Andreessen Horowitz, Founders Fund, Accel and Thrive Capital back renewable energy companies at Fourth Power's stage. Their profiles are linked below.
VCs backing renewable energy startups at Series A
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