2X8 Tileable Nuclear Reactor Expansion
- Heat exchangers
- 240
- Steam turbines
- 434
- Size (tiles, width x height)
- 446 x 40
Factorio BlueprintsAll nuclear reactor blueprintsTileable 2x8 Nuclear Reactor Starter Blueprint
A belt-fed tileable starter with 2x8 and 2x16 expansions; the decoded blueprint is exchanger-limited.

Image of the Tyler Weston Tileable 2x8 nuclear plant blueprint
2,400 MWOutput (computed)
The decoded blueprint contains 100 reactors, but only 240 heat exchangers, so it can deliver 2,400 MW; the reactors' heat (over 12 GW) mostly goes unused. Check the image and the expansion pieces before building.
String exported by Factorio 2.0.73.1. Decoded and checked by this site; not test-imported in the game.
The output shown is computed by this site from the blueprint itself, using normal-quality numbers from the official wiki. Each reactor makes 40 MW of heat plus another 40 MW for every fuelled reactor touching it, which is why a 2x2 block gives 480 MW and a long double row gives 160 MW per reactor minus 160 MW. A heat exchanger turns at most 10 MW of heat into steam and a steam turbine turns that steam into 5.82 MW, so the plant delivers whichever of the three totals is smallest: reactor heat, exchanger capacity or turbine capacity.
A plant is balanced when its exchangers can take all the reactor heat and its turbines can use all the steam. With normal-quality buildings that is one heat exchanger for every 10 MW of heat and about 1.72 turbines per exchanger, because one exchanger makes roughly 103 steam per second and one turbine uses 60. Compare this plant's counts with that: more turbines than needed is harmless, but too few exchangers caps the output.
Fuel cells come in on a belt and inserters load each reactor, so the plant runs without robots; feed the belt from your fuel-cell production and take spent cells out. A fuel cell burns for 200 seconds whether or not the power is used, so belt-fed designs that save fuel use circuit conditions on the inserters to load only when a reactor runs cool.
Each expansion needs its red wires connected between reactors and the green wires between inserters on both sides, and the constant in the arithmetic combinator raised by 16 per 2x8 expansion or 32 per 2x16.
The book holds a 2x8 expansion and 2x16 starter and expansion pieces; the 2x16 pieces decode to 4,800 MW each, again limited by their exchangers.
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Copy the string and press Import string on the shortcut bar in the game, then paste. It was exported from the Factorio 2.0 version shown above. This site decoded it and counted the reactors, exchangers and turbines, but did not import it in the game; check the designer's notes above for water and start-up needs.