CurseForge · Minecraft mod
Colossal Reactors
Build and run large multiblock nuclear reactors to generate power.
Quick answer
Which Colossal Reactors release matches 26.1.2?
Colossal Reactors colossal_reactors-2.6.0.1.0-neoforge-26.1.2.jar targets 26.1.2 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 3 required mods have matching files.
Where it goes
Is Colossal Reactors required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Colossal Reactors colossal_reactors-2.6.0.1.0-neoforge-26.1.2.jar need?
colossal_reactors-2.6.0.1.0-neoforge-26.1.2.jar on 26.1.2. Every mod below is checked against that same setup.
Install Fusion (Connected Textures), Iskandert's Library, Another Config Manager first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Colossal Reactors without breaking your instance.
Built for Colossal Reactors colossal_reactors-2.6.0.1.0-neoforge-26.1.2.jar on 26.1.2. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use colossal_reactors-2.6.0.1.0-neoforge-26.1.2.jar. It targets 26.1.2 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Fusion (Connected Textures), Iskandert's Library, Another Config Manager first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside colossal_reactors-2.6.0.1.0-neoforge-26.1.2.jar. It opens that exact file at the source.
About this project
What does Colossal Reactors add?
Colossal Reactors
Build and run large multiblock nuclear reactors to generate power. Feed them fuel and coolant, then extract RF from a power port. Use the Reactor Builder to automate construction, the Melter to turn items into fluids, and Heating Coils to supply heat.
Reactor
A reactor is a hollow box made of reactor casing and reactor glass. Inside you place reactor rods (they hold the fuel) and coolant: either blocks (e.g. diamond blocks, water blocks) or liquids (e.g. water). The better the coolant, the more power and efficiency you get.
- Reactor Controller — Place it on the reactor (e.g. on top). Open it to see status, stability, energy output, and to reboot the multiblock.
- Rod Controller — Controls how far the rods are inserted. More insertion = more power and heat; you balance this with coolant to avoid overheating.
- Resource Port — Insert solid fuel and coolant fluid, and extract nuclear waste and spent coolant.
- Power Port — Connect cables here to take out RF.
- Redstone Port — Optional. Use it to turn the reactor on or off with redstone, or to require a redstone signal to run.
You need fuel (e.g. uranium-based) and a way to keep the reactor cool. The controller screen shows you if the reactor is valid and how much power it produces.
Reactor Builder
The Reactor Builder automates building the reactor multiblock. You set the size (width, depth, height), choose a rod pattern, and fill its inventory with casing, glass, reactor rods, rod controllers, and optionally coolant blocks or a tank of coolant fluid.
When you start the build, it places the frame, then rod controllers and rods, then coolant (liquid from the tank or blocks from inventory) according to the coolant type you selected in the builder. It will not place blocks where you already have liquid coolant, and it only places the coolant type you chose (e.g. only diamond blocks if you selected that option).
Use it to build colossal reactors quickly and consistently.
Melter
The Melter turns items into fluids (e.g. ingots into molten metal). It has a single item slot and a fluid tank. It does not work alone: it needs a heat source on at least one of its sides (up, down, or the four horizontals). Valid heat sources are lava, campfires, torches, or Heating Coils. Heating Coils give the best heat and are the intended way to run the Melter; lava and campfires work too. More heated sides mean faster melting.
Place the Melter, put heat next to it (e.g. Heating Coils, or lava, or campfires), feed it the right items and it will produce the corresponding fluid. You can pull the fluid out with pipes from the front face.
Heating Coils
Heating Coils are what make the Melter work. They must be placed next to the Melter (any of the six sides). Each coil type “burns” something to produce heat:
- Resource Heating Coil — Consumes fluids and/or items from its front face (e.g. water, fuel items). You pipe in what it needs; it heats up and passes heat to the Melter.
- Energy Heating Coil — Consumes RF from its front face. Pipe power in; it heats the Melter with no fluids or items.
So you can run the Melter with steam and fuel (resource coil) or with pure power (energy coil). Coils have a simple interface on the front to configure input and, for the resource coil, what to consume.
Summary
- Reactor — Multiblock that burns fuel and coolant to make RF; you manage rods and coolant for power and stability.
- Reactor Builder — Builds the reactor for you from inventory and tank; you choose size, rod layout, and coolant type.
- Melter — Melts items into fluids; needs heat from adjacent lava, campfires, torches, or Heating Coils.
- Heating Coils — Supply that heat using either fluids/items (resource coil) or RF (energy coil).
Project description from CurseForge.
Pick your setup
Colossal Reactors by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.1.2
1 loader build1.21.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Colossal Reactors versions and loaders
colossal_reactors-2.6.0.1.0-neoforge-26.1.2.jar
10 Nov 2026
colossal_reactors-2.6.0.0.0-neoforge-26.1.2.jar
29 Oct 2026
colossal_reactors-2.5.0.0.0-neoforge-26.1.2.jar
24 Oct 2026
colossal_reactors-2.4.2.0.0.0-neoforge-26.1.2.jar
23 Oct 2026
colossal_reactors-2.4.1.0.1-neoforge-26.1.2.jar
18 Oct 2026
colossal_reactors-2.4.1.0.0-neoforge-26.1.2.jar
13 Oct 2026
colossal_reactors-2.4.0.0.1-neoforge-26.1.2.jar
4 Oct 2026
colossal_reactors-2.2.2.0.2-neoforge-26.1.2.jar
13 Aug 2026
colossal_reactors-2.2.2.0.1-neoforge-26.1.2.jar
6 Jul 2026
colossal_reactors-2.2.1.0.0-neoforge-26.1.2.jar
5 Jul 2026
colossal_reactors-2.3.0.3.0-neoforge-26.1.2.jar
3 Jul 2026
colossal_reactors-2.2.0.2.0-neoforge-26.1.2.jar
2 Jul 2026
Looking for an older file? The official CurseForge project page is in Resources.