Terrestrial Energy Inc. (IMSR)

Terrestrial Energy Inc. is a nuclear technology company developing the Integral Molten Salt Reactor, an advanced reactor design that uses molten fluoride salt fuel and operates at higher temperatures than conventional light-water reactors.

The design is intended to supply both electricity and high-temperature industrial heat, targeting customers such as utilities, data centers and heavy industry seeking reliable low-carbon power. A distinguishing feature of the concept is that the reactor core unit is designed to be replaced periodically, which is meant to simplify maintenance and extend plant life.

The company has operations in the United States and Canada and has engaged with nuclear regulators in both countries. It became publicly traded on the Nasdaq through a merger with a special purpose acquisition company.