
Just Enough Mekanism Multiblocks Mod (1.21.1, 1.20.1) – Plan Your Factory's Cost
Just Enough Mekanism Multiblocks Mod adds a special page to Just Enough Items (JEI) for Mekanism's complex multiblock structures. This new page lets you…
⬇ DownloadOpen in MCModsHubGet it on Google Play →Just Enough Mekanism Multiblocks Mod adds a special page to Just Enough Items (JEI) for Mekanism’s complex multiblock structures. This new page lets you see the construction cost and abilities of these large machines before you build them. It helps you plan your resources and understand how each multiblock will perform.

Features:
- Calculates the total capacity for fluid and gas tanks.
- Shows the temperature and heating rate for the Fission Reactor.
- Displays the sodium cooling rate for the Thermoelectric Boiler.
- Calculates the overall efficiency of the Industrial Turbine.
- Integrates with JEI’s interface, including the ‘+’ button.
Supported Multiblocks:
Mekanism
- Dynamic Tank
- Thermal Evaporation Plant
- SPS
- Thermoelectric Boiler
- Induction Matrix
Mekanism Generators
- Industrial Turbine
- Fission Reactor
- Fusion Reactor
Better Fusion Reactor for Mekanism PLUS
- Fusion Reactor
Mekanism Extras
- Reinforced Induction Matrix
- Naquadah Reactor
Evolved Mekanism
- Antimatter Protomolecular Transmutator
- Induction Matrix element blocks
How to Use:
Finding Multiblock Pages
- Find the multiblock page in the list of all JEI categories.
- Alternatively, press the ‘Show Uses’ key (default: U) on an item that is part of a multiblock’s recipe.
Fission Reactor Layout Controls
- Left-click and drag: Place a Fuel Assembly.
- Right-click and drag: Remove a Fuel Assembly.
- Mouse wheel scroll: Adjust the height of a Fuel Assembly.
Screenshots:

Dynamic Tank

Thermal Evaporation Plant

SPS

Thermoelectric Boiler – Normal Mode

Thermoelectric Boiler – Sodium Cooling Mode

Thermoelectric Boiler – Steam Height

Induction Matrix

Industrial Turbine

Fission Reactor

Fusion Reactor – Air Cooled

Fusion Reactor – Water Cooled
Just Enough Mekanism Multiblocks Mod Download Links
For Minecraft 1.21.1, 1.21
NeoForge version: Download from Server 1 – Download from Server 2
For Minecraft 1.20.4
NeoForge version: Download from Server 1 – Download from Server 2
For Minecraft 1.20.1, 1.20
Forge/NeoForge version: Download from Server 1 – Download from Server 2
For Minecraft 1.19.2
Forge version: Download from Server 1 – Download from Server 2
For Minecraft 1.18.2
Forge version: Download from Server 1 – Download from Server 2
For Minecraft 1.16.5
Forge version: Download from Server 1 – Download from Server 2
- Download size: 134 KB
- Download link checked 15 Jul 2026 — working
- Mirrored on our own servers — the download does not depend on the original host
These come from our own check of the pack file, not from the source page.