Large technology companies are investing billions of dollars in nuclear energy as an emissions-free source of electricity for artificial intelligence and other businesses.

Amazon’s agreement with Washington-based Energy Northwest will produce four advanced SMRs that will be built, owned, and operated by the utilities consortium. The tech giant is also investing in SMR reactors and fuel developer X-energy, it said. X-energy’s design for advanced nuclear reactors will be used for Amazon’s project with Energy Northwest.