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Overview
Brimstone Energy produces cement differently to reduce carbon emissions. It uses calcium silicate rocks instead of limestone to make Ordinary Portland cement, which avoids the CO2 released when limestone is heated. The process yields cement that can be used in standard concrete and, as a byproduct, supplementary cementitious materials (SCMs) that help further lower the concrete’s carbon footprint. The company’s approach is cleaner and often cheaper than traditional cement manufacturing, and it aims to scale up production from its West Oakland, California base. Overall goal: decarbonize cement and construction by offering a carbon-reducing, cost-competitive cement material and related SCMs that can replace conventional cement in the industry.
About Brimstone
Industries
Industrial & Manufacturing
Energy
Company Size
51-200
Company Stage
Grant
Total Funding
$251.1M
Headquarters
Oakland, California
Founded
2019
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Simplify's Take
What believers are saying
- Brimstone finalized DOE negotiations for up to $189 million in federal funding.
- The Oklahoma quarry site selection and hiring push show real industrialization momentum.
- Brimstone says its 2028 Reno plant and 2034 industrial plant are advancing.
What critics are saying
- DOE financing still depends on matching funds, delaying construction if capital markets tighten.
- Reno demonstration plant targets 2028, leaving years for rivals like Sublime to win customers.
- Commercial scaling across cement, alumina, steel, and minerals risks execution failure before first revenues.
What makes Brimstone unique
- Brimstone’s calcium-silicate feedrock avoids limestone emissions while producing cement and alumina together.
- Amazon reserved cement volumes, validating Brimstone’s product with a demanding first-party customer.
- Century Aluminum MOU expands Brimstone into a mine-to-metal aluminum supply chain.
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Funding
Total Funding
$251.1M
Above
Industry Average
Funded Over
4 Rounds
Growth & Insights and Company News
6 month growth
↓ -1%1 year growth
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Brimstone Energy, a Californian startup, secured up to $189 million in grant funding to develop green cement by replacing limestone with carbon-free calcium silicate rocks. The funding will be used to build a plant for producing cement, supplementary cementitious materials, and smelter grade alumina.
Developing a CO2-free process to produce Portland cement, the exact same material that the industry uses today.
Sign up for daily news updates from CleanTechnica on email. Or follow us on Google NewsSeveral years ago I concluded that Cement’s CO2 Emissions Are Solved Technically, But Not Economically. Since then I’ve had numerous conversations with deep experts on the subject that made me realize that it wasn’t just cost, but regulations that held alternatives back.I’m digging through some of the current crop of alternatives in this mini-series on the subject. Recently, I assessed Sublime Systems’ electrolysis approach, which electrolyses water into oxygen and hydrogen, plays with the ionic chemistry and pH balances, and feeds any lime bearing substance in crushed form through it, including limestone, concrete and electric arc furnace slag.Another thread that was handed to me was California’s Brimstone, which takes a different, less technically avante garde approach.Let’s start with why cement is a problem in terms of climate change. Its primary ingredient is calcium oxide, known as quicklime or lime, with former being more specific and the latter good enough in context. That’s made today by heating limestone to several hundred degrees Celsius in kilns
Brimstone was selected for a $189 million investment by the U.S. Department of Energy’s Industrial Demonstrations Program to decarbonize cement.
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About Brimstone
Industries
Industrial & Manufacturing
Energy
Company Size
51-200
Company Stage
Grant
Total Funding
$251.1M
Headquarters
Oakland, California
Founded
2019
There are no jobs for Brimstone right now.
Find jobs on Simplify and start your career today