Fusion Energy and Advanced Cryogenics Guide

If your factory has reached the point where ordinary power and mid-game production are holding you back, Fusion Power and the Cryogenic Plant are the late-game tools that open the next tier. Start by getting the chain unlocked in the right order, then build the cold-fluid loop deliberately, and only then scale into reactors, generators, weapons, and foundation. If you try to plan power or military output before the science and material chain exists, you will stall on missing late-game inputs.

Unlock the Aquilo-era chain in the right order

Treat the Cryogenic Plant as the gateway, not the finish line. Your first target is Lithium processing, because the Cryogenic Plant itself requires it. Once you can build the Cryogenic Plant, you can start making Cryogenic science pack, and that is the key that opens the rest of the late-game ladder.

From there, push Quantum processor as soon as you can, because it sits in the middle of almost everything important. Fusion reactor research requires Quantum processor, and so does Railgun. Foundation also requires Cryogenic science pack, so if you need buildable terrain for lava, oil ocean, or water, it belongs on the same progression path.

Do not branch out too early. The important chain is simple: get Lithium processing, build the Cryogenic Plant, begin Cryogenic science pack production, and then use that science to unlock Quantum processor, Fusion reactor, Railgun, and Foundation. The fusion and weapon techs are not independent goals; they are downstream of the science chain.

Build the cryogenic supply chain before you try to mass-produce anything

The Cryogenic Plant is where your late-game fluids become manageable. It crafts Fluoroketone (Hot) from Fluorine, Ammonia, Solid fuel, and Lithium, and then you cool that into Fluoroketone (Cold). That cold version is what you feed into science and high-end recipes, while the hot version is the working fluid that comes back out of the system.

Here is the practical flow you should build around:

Set up the loop with purpose: make hot Fluoroketone, cool it, and route the cold form to the recipes that need it. The hot byproduct from Cryogenic science pack and Quantum processor can go back into the cooling step and keep the system circulating.

The biggest logistical constraint is Fluorine. It is found on Aquilo and cannot be barreled, so you cannot ship it off-planet. That means you should plan to produce Fluoroketone and Fusion power cell locally on Aquilo instead of trying to import the full chain. Fluoroketone (Hot) can use standard fluid systems and can be barreled if you need to move it, but the cleanest setup is still local production with pipes, tanks, and direct machine feeds.

Solve the advanced-material bottleneck before scaling the plant

The Cryogenic Plant is not the hard part; the hard part is feeding it. Quantum processor needs Tungsten carbide, Processing unit, Superconductor, Carbon fiber, Lithium plate, and Fluoroketone (Cold). That recipe alone tells you whether your late-game network is actually ready.

Check your interplanetary supply lines before you queue mass production. Superconductor is unlocked on Fulgora, Tungsten plate comes from tungsten ore on Vulcanus, and Carbon fiber is crafted on Gleba. Lithium plate comes from smelting lithium in a furnace. If any one of those imports is unstable, your fusion build will stall no matter how many Cryogenic Plants you place.

This is also where Foundation fits in. It needs Tungsten plate, Lithium plate, Carbon fiber, Stone, and Fluoroketone (Cold), so it competes for the same cross-planet materials as your processors and weapons. If you need terrain first, make a small batch. If you need processors first, keep foundation production minimal until the rest of the chain is steady.

Choose what to build first: power, mobility, or defense

Once the chain works, do not try to build everything at once. Pick one payoff and push it first.

If your base is starving for electricity, start with Fusion reactor and Fusion generator. Fusion power cell is fuel used exclusively by the Fusion reactor, and the Fusion generator consumes plasma to create electric energy. That makes this the best first choice for a collapsing power grid or a factory that is already straining under late-game demand.

If your goal is personal mobility or remote operations, prioritize Portable fusion reactor. It is built from Portable fission reactor, Fusion power cell, Tungsten plate, Carbon fiber, Supercapacitor, and Quantum processor, so it is expensive, but it pays off in equipment power where you feel it immediately.

If you are defending space infrastructure or preparing for heavy anti-air work, move Railgun and Railgun turret higher on the list. The Railgun gives you a strong late-game weapon item, and the Railgun turret is a long-range electric cannon turret that is effective against enemies and asteroids. Do not spread your scarce late-game materials across all three paths on the first pass; finish one, then move on.

Lay out fusion reactors and generators so you get the bonus you paid for

The Fusion reactor rewards adjacency, so build it with fluid connections in mind instead of just square efficiency. Like nuclear reactors, it gains a neighbour bonus from adjacent operating reactors, but the requirement is only one fluid connection between reactors. Connecting two outputs to the same reactor does not add anything.

Each linked reactor increases the energy potential of the generated plasma by 100%, which means hotter plasma and more output. With no bonus, plasma is generated at 1 million °C; with a 100% bonus, it is 2 million °C, and so on. Different reactors in the same array can run at different temperatures, and the plasma averages out in the system.

The practical rule is this: start small, confirm that your generators are scaling with heat, and expand only after the plumbing is stable. A Fusion reactor has 2 fluid connections on each side, and the highest practical neighbour bonus while still leaving room to insert Fusion power cells is +500%. The cold Fluoroketone draw does not increase with neighbour bonus; it stays at 4/s per reactor, modified by quality. That means the layout challenge is adjacency and insertion space, not a runaway coolant bill.

As a planning target, a single reactor can support 2 generators for 100 MW, 8 generators for 400 MW, 18 generators for 900 MW, and 28 generators for 1400 MW. Fusion generator output scales with plasma heat, up to 50 MW each, so hot plasma is what makes the whole system worth building.

If you want the late-game version of Factorio that actually changes your options, this is the order to follow: unlock the Cryogenic Plant, stabilize the cryogenic fluid loop, secure your cross-planet inputs, and then commit to either power, mobility, or defense. Do that, and Fusion Power stops being a tech tree curiosity and becomes the backbone of your next factory tier.