Amrize expands Saint-Constant cement plant in Quebec adding 300000 tonnes capacity and targeting 40% carbon reduction by 2035

Amrize broke ground on a major modernization of its Saint-Constant cement plant near Montreal, adding 300,000 tonnes of annual capacity to reach 1.2 million tonnes. The company says the project is the largest investment in Canadian cement in a decade and aims to cut the plant's net carbon footprint by more than 40% by 2035. The upgrade also targets better energy efficiency, storage, and logistics, which could lower operating costs and support a local supply label for Quebec infrastructure projects. For investors, the key question is execution. Large plant modernizations carry timeline and budget risk, but if Amrize delivers on the capacity increase and emissions reduction, Saint-Constant could strengthen the company's position in a region with rising infrastructure and housing demand. The project ties together local production, lower carbon intensity, and logistics improvements, which matters as public procurement and corporate buyers increasingly favor lower-emission cement.