Babcock builds smaller nuclear units of 100 megawatts, which can also be aggregated together to supply as much power as a base-load nuclear generator, or 1, 000 megawatts.
Instead of stepped gears like a conventional transmission, it has a fixed planetary gear, and changes engine speed by adjusting the generator electric load.
Neither solar nor wind are powerful enough to carry the heavy load that a backup generator must provide to a facility such as a hospital or a school or a county prison.