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.
By using this site, you agree to allow SPEEDA Edge and our partners to use cookies for analytics and personalization. Visit our privacy policy for more information about our data collection practices.