Source-checkedQuality of life & UI

Zar's Nuclear Tweaks

by ZarSasha · for Factorio

Various optional tweaks to make nuclear power a bit more sensible and easier to get started with.

829Downloads
7d agoLast updated
UnlicenseLicense
2.1Latest game version

About Zar's Nuclear Tweaks

From Factorio Mod Portal

Various optional tweaks to make nuclear power a bit more sensible and easier to get started with.

#Zar's Nuclear Tweaks


v2.4.0: Update to description and screenshots pending.


This mod offers many options to tweak mechanics related to Nuclear Power. Several of them are useful for simply reducing the enormous waiting times involved in the setup of nuclear energy. They are also useful for balancing the game in relation to various mods. Has compatibility for [Atomic Overhaul] and [Schall Uranium Processing] since v2.2.0.


Configurable options:

  • Uranium Processing U-235 chance: Change the probability of getting U-235 from Uranium Processing (range: 0-1).
  • Kovarex U-235 catalyst amount: Change the minimum required amount of U-235 for the Kovarex Enrichment Process to run (range: 1-40).
  • Uranium Fuel Cell burn value (GJ): Change the amount of energy contained in the Uranium Fuel Cell item, measured in gigajoules.
  • Nuclear Fuel burn value (GJ): Change the amount of energy contained in the Nuclear Fuel item, measured in gigajoules.
  • Nuclear Reactor burn rate (MW): Change the rate at which nuclear fuel is burned in the Nuclear Reactor.
  • No Nuclear Reactor neighbour bonus: Disable the efficiency bonus that Nuclear Reactors receive when they are put next to eachother. Useful for balancing in relation to other options.
  • Nuclear Fuel stack size: Change the stack size of Nuclear Fuel for all inventories (range: 1-20).
  • Recover iron from nuclear recycling: Recover some or all of the Iron Plates that went into producing the Uranium Fuel Cells when reprocessing their spent result.

Other options:

  • Fluidless uranium mining: Move the need for Sulfuric Acid from the Mining Drill to a new Yellow Cake recipe in an Assembler Mk2+ (see image).
  • Non-greedy Kovarex: Make the Centrifuge take only the ingredients for the Kovarex Enrichment Process needed for the next production cycle.
  • Lossless nuclear reaction: Prevent the Nuclear Reactor from wasting any fuel when the maximum temperature has been reached.
  • Oil-free Nuclear Fuel: Remove Rocket Fuel from the recipe for Nuclear Fuel, along with the relevant tech prerequisite.
  • Reduce Kovarex research cost: Reduce the cost of researching the Kovarex Enrichment Process technology by half.

Compatibility:

  • Schall Uranium Processing: Kovarex U-235 catalyst amount applies to Low Enriched Uranium instead (when the process is enabled). Fluidless uranium mining is automatically disabled for now, due to tedious recipe conflict. May fix later.
  • Atomic Overhaul: Changes to energy parameters of Nuclear Fuel/Uranium Fuel Cell will apply to similar items at equal ratios. Fluidless uranium mining also switches the ingredient for Thorium Processing, and Oil-free Nuclear Fuel removes Rocket Fuel from Plutonium Fuel as well. Recover iron from nuclear recycling won't work and isn't appropriate for this mod anyway, so it's disabled.

[Atomic Overhaul]: https://mods.factorio.com/mod/Atomic_Overhaul [Schall Uranium Processing]: https://mods.factorio.com/mod/SchallUraniumProcessing

FAQ

Q: Is this a mod of excellent quality? A: It seems pretty all right! This is the sixth mod I have made for Factorio, and while I am not a programmer, I have taken my time with it to ensure its function.

Q: Why make this mod? A: I made it for different purposes, but the most important one is to make it less time consuming and tedious all around to get started with nuclear energy. I am not really into scaling massively to make things go faster, but would rather spend more time with figuring out good and aesthetically pleasing factory design. Moving the need for sulfuric acid away from the mining stage seems more realistic, it eases logistics and allows for factory design that I simply find more aesthetically pleasing.

Q: How is mod compatibility? A: That is hard to say, but some options may have to be disabled to avoid conflicts with other mods, with recipe changes being the most likely cause of that. For now, I have adapted the mod to work with [Schall Uranium Processing] and [Atomic Overhaul].

Q: Are you going to change or expand on the mod? A: At this point in time, probably not.

[Configurable Mining Drills]: https://mods.factorio.com/mod/ConfigurableMiningDrills [Configurable Custom Electric Mining Drill]: https://mods.factorio.com/mod/ConfigurableElecMiningDrill [Filter Mining Drills]: https://mods.factorio.com/mod/FilterMiningDrills?from=updated [Schall Uranium Processing]: https://mods.factorio.com/mod/SchallUraniumProcessing?from=search [Atomic Overhaul]: https://mods.factorio.com/mod/Atomic_Overhaul

Highlights

From source data

Game versions

Built for Factorio 2.1.

Footprint

Rated a light load on a server.

License

Published under Unlicense.

Zar's Nuclear Tweaks on Nxeon

From our catalogue
One-click install
Supported on Nxeon Factorio servers. We download it from Factorio Mod Portal, place it, and restart the server.
Server side
Required on the server
Server load
light
Smallest plan we suggest
Factorio — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
Latest build
2.4.1, released 2026-10-28

Recent builds

BuildReleasedGame versionsLoaders
2.4.12026-10-282.1n/a
2.4.02026-10-282.1n/a
2.3.12026-08-032.1n/a
2.3.02026-07-182.1n/a
2.2.22024-11-302.0n/a
1.0.02024-05-291.1n/a

Dependencies

Declared by the newest build that lists any. Required ones are installed with it on one-click installs.

Run Zar's Nuclear Tweaks on a Factorio server

Pick a server or deploy a new one above; it is installed in one click.

What kind of mod it is

From the catalog
Listed on Factorio Mod Portal as “Mods”

Quality of life & UI

Small conveniences, tweaks and interface improvements players notice straight away.

Runs on your server

From source side support

Factorio Mod Portal lists Zar's Nuclear Tweaks as required on the server. Check its Factorio Mod Portal page to see whether players need it too.

Compatibility

Game
Factorio
Runs on
Serverrequired on the server
Game versions
2.1

Verified at the source

  • ✓Factorio Mod PortalOfficial listing, checked 2026-10-29Open ↗
  • ✓AuthorZarSasha, as published on Factorio Mod Portal
  • ✓LicenseUnlicenseFree

Zar's Nuclear Tweaks, answered

Generated from the mod’s own source data.

Do my players need to install Zar's Nuclear Tweaks?

Factorio Mod Portal lists Zar's Nuclear Tweaks as required on the server. Check its Factorio Mod Portal page to see whether players need it too.

Is it free?

Yes. Zar's Nuclear Tweaks is free to download from Factorio Mod Portal. Its license is Unlicense.

How do I add it to my Nxeon server?

Use “Add to a server” on this page, or open NxLabs from your dashboard. We install it, restart your server and switch it on.

NxLabs

Run Zar's Nuclear Tweaks on a Factorio server.

Deploy in about a minute from $2.99 a month, then add Zar's Nuclear Tweaks in one click.