About EM Holmium Charging
From Factorio Mod PortalAdds a solid-state holmium processing chain for Holmium Plates that preserves quality. Crush ore into powder, load it onto iron plates via electromagnetic ion exchange, then strip it in a foundry to holmium plates. Iron plates cycle back as reusable carriers. All vanilla holmium recipes remain untouched.
EM Holmium Charging
Vanilla holmium goes through a fluid, and fluids cannot carry quality. This mod is a holmium chain that never lets the metal get wet.
TL;DR
- Crush holmium ore into powder, load the powder onto iron plates by ion exchange in an Electromagnetic Plant, strip holmium plates back off in a Foundry. Three recipes, no fluid holmium anywhere.
- Quality survives the whole way — ore → powder → charged matrix → plate. The vanilla Holmium Solution route drops it.
- The iron is a catalyst, not an ingredient. Every iron plate that goes into the loading step comes back out of the stripping step. Net iron cost: zero.
- 1 Holmium Ore → ~2.67 Holmium Plates, slightly above vanilla's 2.5, as payment for the longer chain.
- Seed the loop once at the quality tier you want — the iron has to match the powder's quality, and then it circulates at that tier forever.
- One technology, Solid-State Holmium Refining, unlocks all three recipes. No vanilla holmium recipe is touched; the solution path keeps working for everything that does not care about quality.
- Requires Space Age and the Recycler. Optional Crusher support with Crushing Industry, Krastorio 2 and Krastorio 2 Spaced Out.
Recommended alongside — built to run together, none of them needs the others:
- Fulgorite Harvesting — grows quality holmium ore out of the ground on Fulgora. This mod is what carries that quality to the plate.
- Fulgorite Mining — a lodemast mineralizes fulgorite ore into the ground around it, and a Big Mining Drill digs it up. Recycle fulgorite into holmium ore and stone.
- Storm Ionizer — calls lightning down on demand, day or night.
What it does
This mod adds a parallel solid-state processing chain where holmium never enters a fluid state. Quality propagates from ore to powder to charged matrix to plate — fully intact at every stage.
Iron plates serve as reusable electromagnetic ion-exchange carriers: they get loaded with holmium ions in an Electromagnetic Plant and thermally stripped in a Foundry, recovering both the holmium plate and the iron carrier. The iron loops back indefinitely once seeded.
All vanilla holmium recipes remain completely untouched. The existing Holmium Solution path continues to work as before for non-quality-sensitive use cases.
Processing Chain
Stage 1 — Holmium Pulverizing
Mechanically crush holmium ore into fine powder to increase surface area for ion exchange.
- Building: Assembler or Crusher (with Crushing Industry, K2 or K2SO enabled)
- Recipe: 1 Holmium Ore → 8 Holmium Powder
Stage 2 — Ion-Exchange Loading
Load holmium ions onto iron plates using sulfuric acid and lubricant as carrier medium inside an electromagnetic field.
- Building: Electromagnetic Plant
- Recipe: 3 Holmium Powder + 2 Iron Plate + 3 Sulfuric Acid + 20 Lubricant → 2 Charged Iron Matrix
- Effective output: ~3 Charged Iron Matrix per craft (due to EM Plant productivity)
Stage 3 — Electromagnetic Stripping
Thermally strip holmium from the charged matrix in a foundry, recovering both the holmium plate and the iron carrier for reuse.
- Building: Foundry
- Recipe: 3 Charged Iron Matrix + 5 Heavy Oil → 1 Holmium Plate + 2 Iron Plate
- Iron output is not affected by productivity — the iron carrier is recovered as-is
Ratios
- 1 Holmium Ore → ~2.67 Holmium Plates (slightly above vanilla's 2.5, as an incentive for the more complex chain)
- Iron Plate consumption: zero — iron cycles between Stage 2 and Stage 3 as a reusable carrier
- Net cost per plate: ~1.1 Sulfuric Acid, ~7.5 Lubricant, ~1.9 Heavy Oil, no iron
Iron Loop
The two iron plates fed into Stage 2 are fully recovered in Stage 3. Over a full productivity cycle (2 loading crafts + 1 bonus craft → 2 stripping crafts), 4 iron plates enter and 4 iron plates return. No iron is created or consumed.
You will need to seed approximately 6–8 iron plates per Electromagnetic Plant as initial working stock. After that, the loop is self-sustaining.
Quality note: Since iron plates are a solid input in Stage 2, they must match the quality level of the holmium powder. To produce quality holmium plates, you need to upgrade the iron in your loop once to the target quality tier. After that, the iron circulates at that quality level indefinitely.
Cost Comparison to Vanilla
| | Vanilla (per ore) | EM Holmium Charging (per ore) | |---|---|---| | Stone | 0.5 | — | | Water | 5 | — | | Sulfuric Acid | — | ~2.67 | | Lubricant | — | ~17.8 | | Heavy Oil | — | ~4.4 | | Iron Plate | — | 0 (catalytic) | | Plates out | 2.5 | ~2.67 | | Quality preserved | No | Yes |
On Fulgora, lubricant and heavy oil are effectively free. Sulfuric acid is the only meaningful cost, requiring oil cracking and iron plates to produce.
Technology
Solid-State Holmium Refining unlocks all three recipes.
- Prerequisites: Electromagnetic Science Pack, Sulfur Processing
- Cost: 500 packs (Automation + Logistic + Chemical + Space + Production + Electromagnetic)
Compatibility
Mod Compat with Crushing Industry. Note: The Holmium ore-to-powder ratio has changed from 1 ore -> 1 powder to 1 ore -> 8 powder. The Holmium solution recipe has been adjusted accordingly, from 2 (3) powder to 16 powder. However, the total cost of Holmium ore remains the same as in vanilla.
Highlights
From source dataFootprint
Rated a light load on a server.
License
Published under MIT.
Last update
Its author last shipped an update 13d ago.
EM Holmium Charging 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
- 1.1.3, released 2026-10-21
Recent builds
| Build | Released | Game versions | Loaders |
|---|---|---|---|
| 1.1.3 | 2026-10-21 | 2.1 | n/a |
| 1.1.2 | 2026-10-20 | 2.1 | n/a |
| 1.1.1 | 2026-07-09 | 2.1 | n/a |
| 1.1.0 | 2026-07-08 | 2.1 | n/a |
| 1.0.0 | 2026-05-10 | 2.0 | n/a |
| 0.1.0 | 2026-05-08 | 2.0 | n/a |
Dependencies
- Required: [reserved]
- Optional: Crushing Industry
- Optional: Krastorio 2
Declared by the newest build that lists any. Required ones are installed with it on one-click installs.
Run EM Holmium Charging 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 catalogWeapons, items & crafting
New weapons, gear, items and the recipes to make them.
Runs on your server
From source side supportFactorio Mod Portal lists EM Holmium Charging 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
Verified at the source
- ✓Factorio Mod PortalOfficial listing, checked 2026-10-22Open ↗
- ✓AuthorMorlot, as published on Factorio Mod Portal
- ✓LicenseMITFree

