Sublime Systems has developed a proprietary ambient-temperature electrochemical process that replaces the traditional combustion-driven kiln to produce cement. The company says its process yields a superior cement that dramatically reduces carbon emissions and has a path to cost parity at scale with conventional Portland cement. Sublime is preparing a first commercial manufacturing plant in Holyoke, Massachusetts. Suffolk Technologies announced an investment in Sublime and Suffolk has pre-purchased capacity from that forthcoming plant. The partnership is presented as a means to accelerate adoption across the construction supply chain and validate Sublime’s technology. Sublime’s leadership emphasizes that bringing a new cement to market requires collaboration with builders and supply-chain partners. Sublime Systems commercializes a breakthrough, fully electrified electrochemical cement-making technology that avoids both mineral and fossil-fuel CO2 emissions by extracting reactive calcium and silicates at near-ambient temperature. The company produces ASTM C1157‑compliant Sublime Cement™, designed as a drop-in replacement for ordinary portland cement in concrete. Founded at MIT in 2020, Sublime operates a Somerville, MA pilot plant with a >250 TPY nameplate capacity and is developing a 30,000 TPY first commercial facility in Holyoke, MA expected as early as 2026. Sublime has raised over $200M from climate tech investors, global cement incumbents, and U.S. Department of Energy cooperative programs (ARPA‑E, IEDO, OCED). Its technology aims for cost and scale parity with conventional cement and to enable rapid global deployment. Partnerships with industry incumbents are positioned to accelerate scale‑up, manufacturing, logistics, and distribution of the technology. Sublime Systems has developed a proprietary electrolyzer process that makes cement at ambient temperature from abundant calcium sources, avoiding both fossil fuel use and CO2 release from limestone. The company says its product matches or exceeds Portland cement in strength, slump, and durability and is a drop‑in replacement for traditional cement. Sublime is the first company reported to produce cement without emissions from limestone or high‑temperature firing. The firm was spun out of MIT in 2020 and is based in Somerville, Mass. The new capital will be used to ramp up production at its pilot plant, expand the team, conduct product testing, and advance offtake commitments with customers and partners. The article cites a completed $40 million Series A as the company’s current financing milestone.

Total raised

$40M

Funding rounds

3

Latest round

Series A

Latest activity

Jan 2023