Brimstone Energy

Overview
News
Carbon Capture, Utilization & Storage (CCUS)?
Product stageSegments
Seed
?
Next-gen Carbon Utilization: Other
?

Brimstone Energy is a startup manufacturing carbon-negative portland cement and supplementary cementitious materials (SCM) through substituting limestone, which releases CO2 when processed, with calcium silicate rock, which has no embedded CO2. Furthermore, the process creates silica to replace the fly ash found in cement. The latter is normally sourced from coal-fired power plants. Finally, in order to be carbon negative the company uses magnesium rock, a byproduct of the silicate processing, as it will react with CO2 and solidify, thereby absorbing atmospheric CO2.

In March 2024, the Department of Energy selected Brimstone for a USD 189 million federal award to build the first commercial-scale plant that can produce cement while avoiding 120,000 metric tons of CO2 emissions annually.

Key customers and partnerships

Brimstone leads the First Builders initiative, an industry coalition to engage cement companies, architects, structural engineering firms, and concrete companies that want to jointly develop plants or directly buy industrial quantities of cement. Additionally, in April 2022, Brimstone partnered with Amazon’s Climate Pledge Fund to scale up its operations.

Funding and financials 

Brimstone’s latest funding was in March 2022, when the company raised USD 55 million in a Series A round co-led by Breakthrough Energy Ventures, DCVC, and Fifth WallInnosuisse.  The company intended to use the funds to build a pilot plant.

HQ location:
1 Cyclotron Rd Berkeley CA USA
Founded year:
2019
Employees:
11-50
IPO status:
Private
Total funding:
USD 244.0 mn
Last Funding:
USD 189.0 mn (Grant; Mar 2024)
Last valuation:
-
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