How to Host a Mekanism: Automation Server
Mekanism: Automation is a NeoForge 1.21.1 tech pack with 35K downloads that puts Mekanism itself — one of the most complete industrial mods, with ore processing, gas systems, nuclear reactors, and advanced machinery — at the centerpiece, rather than treating it as one mod among dozens. That's a different lane from Technical Electrical, a separate pack already covered here that's built around general electrical automation instead of Mekanism's specific industrial systems. Getting the hosting basics right first makes the difference between a server that boots clean and one that corrupts a factory before it's finished.
Start with at least 6 GB of RAM. Mekanism's ore processing chains, gas systems, and nuclear reactors on NeoForge 1.21.1 load a heavy block and recipe footprint before a single factory line is even built, and 6 GB is the catalog's own recommended floor for this pack — not a generic modpack guess.
Import the official Mekanism: Automation modpack file directly instead of rebuilding it from a client export. A clean import keeps config files, recipe tweaks, and the complementary automation mods bundled with Mekanism in sync, and lets you pick NeoForge 1.21.1 explicitly instead of guessing the loader and version from a mod list.
Watch the first boot through to a clean finish. Mekanism alone registers a large set of new blocks, items, and gas/fluid recipes on startup, and the automation mods around it add more — confirm the console reaches "Done" with no mod-loading errors before you consider the server ready.
Only invite players once that first clean startup is confirmed. A world generated mid-crash or during a partial mod load can corrupt chunk data under Mekanism's multiblock structures — fission/fusion reactors, digital miners, factory arrays — in ways that are difficult to undo later.
Take a backup before any world import, loader update, or config change. Losing a late-game Mekanism setup means losing tuned gas-burning reactors and automated ore-processing lines, not just raw resources — hours of factory design, not just loot.
Use a cleaner Mekanism: Automation path
CoalHost is built around modpack hosting, which makes Mekanism: Automation much less annoying to launch correctly.
Deploy Mekanism: Automation now →