Mekanism Fission Recipe
Mekanism Fission Recipe lets pack makers define their own fission reactor recipes and coolant recipes for Mekanism Generators, using JSON files.
What it does
Custom recipes for the Fission Reactor of Mekanism Generators are written as JSON. Each fission recipe names a gas input, the input amount, and the amount of heat it produces, so a pack can add a fuel that is not Fissile Fuel. Equations in the recipe can relate the input to the output; the author's example makes 0.1 mB of a burning fuel generate 0.01 heat. Recipes that use the mekanism:fission type are read by the reactor.
Coolant recipes are defined with the mekanism:fluid coolant type. A coolant recipe accepts a single fluid type, which can be given as a fluid or a fluid tag, such as water, and sets how much heat that fluid removes. Coolant recipes come in two types. The author describes a relationship between thermal enthalpy, conductivity and efficiency, shown as a code snippet.
The mod requires Mekanism and Mekanism Generators. The server and every player need the mod installed. Files are published for Forge and NeoForge for 1.19.2 – 1.21.1, and the code is open source under the GNU General Public License v3.0 only.
Key features
Custom fission recipes
Pack makers add new gas inputs and heat outputs to the Fission Reactor through JSON recipe files.
Equation-based outputs
An equations field uses x as the input amount, so heat output can scale with how much fuel is supplied.
Fluid coolant recipes
Any single fluid or fluid tag can be registered as a coolant with its own cooling behavior.
Sample JSON files
The project provides example JSON for fission and coolant recipes to copy and adjust.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 2
Use cases
Modpack fuel progression
A pack can introduce a custom fuel with its own heat value, separate from Fissile Fuel.
Who it’s for: Modpack developers and data pack authors who want to change the Fission Reactor. Players who only use existing recipes do not need to edit any files.
How it compares
Mekanical Create is a Forge and NeoForge mod for 1.20.1 – 1.21.1 under the MIT License and open source, and it runs on client and server. Just Enough Mekanism Multiblocks covers 1.16.5 – 1.21.1 under the MIT License and is client-side only, so servers need nothing from it. Mekanism: Ponders is open source under the GNU Lesser General Public License v3.0 only and is also a client and server mod for 1.20.1 – 1.21.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Mekanism Fission Recipe | Forge and NeoForge | 1.19.2 – 1.21.1 | Client and server | 2025-01-20 |
| Just Enough Mekanism Multiblocks | Forge and NeoForge | 1.16.5 – 1.21.1 | Client-side only | 2026-09-22 |
| Mekanism: Ponders | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-10-09 |
Questions
Which Mekanism mods does Mekanism Fission Recipe require?
Does the server need Mekanism Fission Recipe?
Which game versions have files?
In the catalog
Mekanism Fission Recipe is one of 8,499 Technology mods on ModsFinder, and one of 4,122 Technology mods for Forge. 32,366 mods support Minecraft 1.21.1.
More from NorthWestWind
Similar mods
What the author says
This code snippet is the relationship between thermal enthalpy, conductivity and efficiency.
Official listing
- Modrinth page
- modrinth.com/mod/mekanism-fission-recipe
- Owner
- NorthWestWind
- Published
- 2024-09-14
- Updated on Modrinth
- 2025-01-20
- Facts verified
- 2026-10-15