Sublime Systems

Sublime Systems is a leading developer of technology to produce decarbonized cement, with a goal to address 8 percent of the world’s carbon emissions. Sublime replaces the industry’s legacy fossil-fueled kilns with an electrochemical process that makes cement at ambient temperature, resulting in sustainable cement with both low embodied CO2 and low embodied energy. The process greatly reduces CO2 emissions without the need for post-combustion carbon capture.

Cement production accounts for approximately 8 percent of global CO2 emissions. To electrify heavy industry and reach global decarbonization goals, low-carbon cement production is critical. Sublime’s proprietary process replaces kilns - the most energy and fossil-fuel-intensive part of the traditional cement manufacturing process - with an electrolyzer that makes cement at ambient temperature from a variety of abundant calcium sources, thereby avoiding both the use of fossil fuels and the release of CO2 from limestone. Sublime is the first company to produce cement through a process that eliminates emissions from limestone as well as fossil fuel emissions from the high temperature firing process.