Reference — IC2 Classic Mod Wiki

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Core Mechanics: The EU System

The Energy Unit (EU) is the lifeblood of IC2 Classic. Understanding how it flows is critical to preventing your machines from exploding.

Every machine has a maximum input voltage. Exceeding this will cause the machine to explode.

Tier	Name	Max Voltage (EU/p)	Typical Source
1	Low Voltage (LV)	32 EU	Basic Generators, BatBox
2	Medium Voltage (MV)	128 EU	CESU, MFE, Wind Mills
3	High Voltage (HV)	512 EU	MFSU, Nuclear Reactors
4	Extreme Voltage (EV)	2048 EU	High-tier Transformers
5	Insane Voltage (IV)	8192 EU	End-game Power Storage

Energy is lost as it travels through cables. Better materials and insulation reduce this loss.

Tin Cable: Best for LV. Very low loss over short distances.
Copper Cable: Standard for LV/MV. Moderate loss.
Gold Cable: Required for MV/HV. High loss unless insulated.
HV Cable (Iron): Used for HV/EV. Massive loss over distance.
Glass Fibre Cable: The gold standard. Extremely low loss and handles up to 512 EU/p (or more in specific configurations).

IC2 Classic introduces several new materials that are essential for crafting circuits, machines, and tools.

Copper Ore: Found at middle elevations. Used for basic wiring and small power storage.
Tin Ore: Found at middle elevations. Used for tin cans, batteries, and bronze alloy.
Uranium Ore: Rare, found deep underground. The primary fuel for Nuclear Reactors.
Lead Ore: Used for radiation shielding and advanced batteries.
Rubber Trees: These trees feature distinctive orange 'sticky resin' spots. Use a Treetap on these spots to collect resin, which is smelted or extracted into Rubber for insulating cables.

Bronze: Created by mixing 3 Copper Dust and 1 Tin Dust. It is as strong as Iron but more durable.
Refined Iron (Steel): Created by smelting Iron Ingots a second time (in 1.12.2) or via the Blast Furnace. Essential for machine casings.
Carbon Plate: Made from Raw Carbon Mesh compressed in a Compressor. Used for high-end armor and machines.

Automation begins with processing raw materials into more efficient forms.

Macerator: Grinds ores into 2 Dusts, effectively doubling your ore yield. It can also grind gravel into flint or bone into bone meal.
Electric Furnace: A faster, EU-powered version of the vanilla furnace.
Extractor: Processes Sticky Resin into 3 Rubber (compared to 1 in a furnace). Also used to create Coils and Fuel.

Compressor: Turns loose materials into dense plates. Essential for creating Carbon Plates and Advanced Alloy.
Recycler: Consumes any item to produce 'Scrap'. Scrap can be used to create Scrap Boxes or as a catalyst in a Mass Fabricator.
Mass Fabricator: Consumes massive amounts of EU to produce UU-Matter, a liquid or solid that can be crafted into almost any resource in the game.
Induction Furnace: An advanced furnace that processes two stacks at once and becomes faster as it stays hot.

IC2 Classic replaces the need for disposable tools with rechargeable electric versions.

Mining Drill: Equivalent to an Iron Pickaxe/Shovel. Can be upgraded to a Diamond Drill.
Chainsaw: A powerful axe and shears combo. Highly effective against leaves and wood.
Electric Treetap: Quickly harvests resin without the manual clicking.
Nano Saber: A high-tech sword that deals massive damage when turned on, consuming EU per hit.

Hazmat Suit: Protects the player from radiation (essential for handling Uranium) and fire damage.
Nano Suit: High-tier armor that provides significant damage reduction using EU.
Quantum Suit: The pinnacle of technology. It makes the player nearly invincible, allows for super-speed, massive jumps, and underwater breathing. It requires a Mass Fabricator to produce the necessary materials.