A train-based tileable nuclear reactor. The blueprint book contains the tileable version, as well as a 12 reactor (2 GW) ready-to-go setup with a simple controller that runs the reactors when the steam storage goes below 5% of maximum capacity and a fancy-looking steam storage capacity display. The blueprints also contain blueprints for the train station to fill the trains.
https://www.reddit.com/r/factorio/comments/6i2x4i/ran_out_of_power_went_all_out_and_made_a/