Fourth Power has raised $20 million to build a demonstration version of its thermal batteries, which ultimately could store ...

The firm has proved its thermal batteries can store energy in carbon blocks. It will use this latest round to scale commercial viability.

Congrats, we did it! Solar and wind are now the cheapest sources of electricity in the U.S. Now we just have to sit back and let the market do the work, right? Not so fast. It’s true that wind and ...

Fourth Power says its ultra-high temperature "sun in a box" energy storage tech is more than 10X cheaper than lithium-ion batteries, and vastly more powerful and efficient than any other thermal ...

BOSTON--(BUSINESS WIRE)--To meet the growing demand for renewable energy on the grid, Fourth Power has received $19 million in Series A funding to scale its cost-effective groundbreaking thermal ...

The Series A round, led by venture capital firm DCVC, with participation from Breakthrough Energy Ventures and Black Venture Capital Consortium, will support the construction of the company's 1 MWh-e ...