HomeMinecraft ModsExtreme Reactors Mod (1.21.1, 1.20.1) – Fuel Your Industrial Base

Extreme Reactors Mod (1.21.1, 1.20.1) – Fuel Your Industrial Base

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November 16, 2025

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Extreme Reactors Mod lets you build giant, multi-block machines to generate huge amounts of energy. This mod is a port of the classic Big Reactors mod, updated for modern Minecraft versions. You can build powerful Reactors that consume fuel to produce power, or massive Turbines that turn steam into energy. The power generated is Forge Energy (FE), which can be used to run machines from many other technology mods.

Features:

Core Machines

Reactors: Construct large, customizable reactors that burn fuel to create heat and power. They can be cooled passively to generate FE directly, or actively with water to produce steam.
Turbines: Build massive turbines that take steam from an actively cooled reactor and convert it into large amounts of FE.
Fluidizer: A new multi-block machine that converts solid fuels into fluid form. It can also mix different fuels to create new, more efficient types.
Reprocessor: This 3x3x7 multi-block machine processes waste materials from your reactor into new, usable fuels like Blutonium.

Fuels and Materials

Adds new fuels like Yellorium and Blutonium, which is crafted by reprocessing Cyanite waste.
Fuels and wastes can exist as fluids, which are moved using Fuel Injection Ports.
Introduces late-game coils for turbines, such as Ludicrite, Ridiculite, and Inanite, for massive power output.

Machine Tiers and Ports

Machines come in two main tiers: Basic for early-game and Reinforced for large-scale, late-game builds.
Internal energy and fluid storage buffers scale with the size of your machine.
Use Active and Passive Power Taps and Fluid Ports to control how energy and liquids are transferred. Active ports push automatically, while passive ports wait for a request.
A Reinforced Computer Port allows you to connect your systems to CC-Tweaked for full automation.

How to Use:

Start by building a small, Basic passive Reactor to generate your first FE and produce Cyanite waste.
Use a Reprocessor to turn the Cyanite into better fuels, like Blutonium.
Upgrade to an active-cooled Reactor and add Turbines for much higher power output.
For maximum efficiency and safety, connect a Reinforced Computer Port to automate your reactor with CC-Tweaked.

Configuration:

Use the /er command (requires op level 2+) to adjust fuel values and turbine coil settings, which is useful for modpack creators.
The mod’s ores can be set to regenerate in the world by changing the enableWorldRegeneration option in the config file.
Server configs can be adjusted to allow for much larger machine sizes if needed.
For in-game documentation, you can get “The Extreme Book” if the Patchouli mod is also installed.
This mod requires the ZeroCore library mod to function.