How difficult would it be to wire in some of those modular mini nuclear power plants into a majority of sub-stations? I believe a lab in Idaho is working on a

How difficult would it be to wire in some of those modular mini nuclear power plants into a majority of sub-stations? I believe a lab in Idaho is working on a small nuclear power station. I've seen some articles on various countries working on modular power plants as well. One of the sub-stations near me has a solar panel field wired into it. Would a few constant megawatts at each sub-station should significantly reduce the overall load on the long-haul transmission lines?