CurseForge · Minecraft mod
Better Fusion Reactor for Mekanism PLUS
Reinvention of Fusion Reactor and new stuff
This page is having a moment, so a few details may be a little behind.
Quick answer
Which Better Fusion Reactor for Mekanism PLUS release should I use?
Better Fusion Reactor for Mekanism PLUS BetterFusionReactor-1.20.1-1.4.14.jar targets 1.20.1 with Forge, NeoForge. The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server. All 2 required mods have matching files.
Where it goes
Is Better Fusion Reactor for Mekanism PLUS required on the client, server, or both?
The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.
The source does not explicitly classify this release as client-only or server-only.
What else does Better Fusion Reactor for Mekanism PLUS BetterFusionReactor-1.20.1-1.4.14.jar need?
BetterFusionReactor-1.20.1-1.4.14.jar. Change the file and its required mods may change too.
Install Mekanism Generators, Mekanism first. We found matching files for this game-version and loader setup. 23 come through another mod in the chain.
23 extra mods were pulled in by other dependencies. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Better Fusion Reactor for Mekanism PLUS without breaking your instance.
Built for Better Fusion Reactor for Mekanism PLUS BetterFusionReactor-1.20.1-1.4.14.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use BetterFusionReactor-1.20.1-1.4.14.jar. It targets 1.20.1 with Forge, NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Mekanism Generators, Mekanism first. We found matching files for this game-version and loader setup. 23 come through another mod in the chain.
- 03
Put it on the correct side
The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside BetterFusionReactor-1.20.1-1.4.14.jar. It opens that exact file at the source.
About this project
What does Better Fusion Reactor for Mekanism PLUS add?
Better Fusion Reactor is an addon for Mekanism Generators
Brings few features into game:
More challenging fusion reactor. Read description or watch video.
Custom coolant support (starting from 1.16+)
Irradiator - new machine which uses radiative flux to transform items. (starting from 1.19+)
Supported versions: 1.12.2, 1.16.5, 1.18.2, 1.19.2, 1.20.1
What’s It All About?
This addon introduces a new layer of challenge and depth to the Mekanism Fusion Reactor. Your main objective is to keep the Current Reactivity (CR) as close as possible to the Target Reactivity (TR). The closer they are, the better your Reaction Efficiency — resulting in more energy, steam per tick, or heat output.
But it’s not just fire-and-forget anymore.
If Efficiency drops below 80%, your Error Level will begin to rise.
At 100% Error, the reactor shuts down automatically.
And if you’ve enabled explosions in the config (disabled by default), it might just go BOOM 💥.
On the flip side:
- If Efficiency stays above 80%, the Error Level will slowly decrease over time.
Reactivity Is Unstable
TR (Target Reactivity) is a random value between 0 and 100, and it changes periodically, making it impossible to just "set and forget" your reactor. You'll need to either manually control it or create some kind of automation logic — redstone, integrated computers, or external mods.
Watch the Heat Multiplier (HM)
HM affects how fast the Error Level changes and how frequently TR updates.
Lower HM = Longer time between TR changes and slower Error Level gain
- For manual control, try to keep HM as close to 0 as possible
HM depends on:
Plasma Temperature – Adjust your injection rate to find the sweet spot
Cooling Type – Water cooling results in a lower Heat Multiplier
Bottom Line:
If you want maximum energy output, you’ll need to automate your reactor control.
Manual operation is possible… but it won’t be easy.
Good luck, engineer.
This addon adds new UI for reactor controller and reactor logic port.
You will have to re-build current reactors if you have any with blocks from this mod.
(WARNING! Functionality and GUI of the mod may be slight different across minecraft versions 1.12, 1.16, 1.18)

Reactor Logic Adapter can emit more signals and it also can receive signals to manage some of reactor parameters.

It also brings new computers functions

New machine block: Irradiator (1.19+)
Use high energy particles and radiation to transform items.
Обзор на русском.
Example LUA script for OpenComputers https://github.com/igentuman/BettefFusionReactor/wiki/Simple-OpenComputers---ComputerCraft-script-for-reactor
Code originally forked from https://github.com/mekanism/Mekanism
Credits:
pupnewfster, aidancbrady, thommy101, thiakil and dizzydfor original modSupport me on patreon: https://www.patreon.com/igentuman
Project description from CurseForge.
Pick your setup
Better Fusion Reactor for Mekanism PLUS by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
1 loader build1.20.1
2 loader builds1.19.2
1 loader build1.18.2
1 loader build1.16.5
1 loader build1.12.2
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Better Fusion Reactor for Mekanism PLUS versions and loaders
BetterFusionReactor-1.20.1-1.4.14.jar
BetterFusionReactor-1.20.1-1.4.15.jar
22 Feb 2026
BetterFusionReactor-1.21.1-1.5.9rc1.jar
22 Feb 2026
BetterFusionReactor-1.21.1-1.5.9b1.jar
1 Sept 2025
BetterFusionReactor-1.20.1-1.4.14.jar
30 Aug 2025
BetterFusionReactor-1.20.1-1.4.13.jar
8 Aug 2025
BetterFusionReactor-1.20.1-1.4.12.jar
21 Jul 2025
BetterFusionReactor-1.20.1-1.4.11.jar
19 Jul 2025
BetterFusionReactor-1.20.1-1.4.10.jar
19 Jul 2025
BetterFusionReactor-1.21.1-1.5.9a2.jar
18 Jul 2025
BetterFusionReactor-1.21.1-1.5.9a.jar
17 Jul 2025
BetterFusionReactor-1.20.1-1.4.9.jar
15 Jul 2025
BetterFusionReactor-1.20.1-1.4.8.jar
6 Jul 2025
Looking for an older file? The official CurseForge project page is in Resources.
