IMSR and Terrestrial Energy – an update by Dr. David LeBlanc. The Integral Molten Salt Reactor is an advanced reactor which is liquid-fueled, and “walk away” safe. Terrestrial Energy has received Canadian and US government support, in the form of grants and loan guarantees. Key Commercial Claim: IMSR power plants are a low-cost clean energy alternative to fossil fuel combustion and they can be deployed in the 2020s. In 2017, Terrestrial Energy began work for siting IMSR power plant at Canadian Nuclear Laboratories.