Exterra

Exterra Carbon Solutions is a Canadian cleantech company based in Montreal, Quebec, specializing in transforming legacy asbestos mining waste into sustainable, low-carbon critical minerals and CO2 sequestration solutions. The company has developed two proprietary technology processes: the LOW process, which produces low-carbon metal oxides such as magnesium oxide and valuable by-products including nickel concentrate for EV batteries and amorphous silica for building materials; and the ROC process, which permanently mineralizes CO2 without the need for carbon capture. Exterra's commercialization strategy centers on Hub I, a planned facility in Val-des-Sources, Quebec, designed to process over 300,000 tonnes of asbestos mine tailings annually. The company has raised CAD $32 million in total, including a CAD $20 million Series A in 2025 co-led by Clean Energy Ventures and BDC Capital. Exterra has received the 2024 Carbon Capture Canada Award and has partnerships with BASF, Energir, WSP, and Winsome Resources.