Water Mill

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Obsolete: This information no longer applies to the current version of IC².

Water Mill
Water Mill ig.png
Grid Water Mill.png
Type Generator
Tool Grid Wrench.png
Armor rating {{{armorrating}}}
Damage {{{damage}}}
Durability {{{durability}}}
Mining level {{{mininglevel}}}
Stackable Yes (64)
Flammable No
Danger {{{danger}}}
Protection {{{protection}}}
Storage {{{storageslots}}}
Liquid Storage {{{lstorage}}} mB
Previous tier {{{prevtier}}}
Next tier {{{nexttier}}}
Energy Consumption
Max EU Input {{{maxeu}}}
EU Use {{{eu_use}}} EU/t
EU Per Operation {{{eu_op}}}
EU Storage 2 EU
EU Production 0.01-2 EU/t
Max EU Output 2 EU/t (??)
Max Heat Input {{{maxhu}}} HU/t
Heat Use {{{hu_use}}} HU/t
Heat Production {{{hu_produce}}} HU/t
Max Kinetic Input {{{maxku}}} KU/t
Kinetic Use {{{ku_use}}} KU/t
Kinetic Production {{{ku_produce}}} KU/t
Technical Details
Operation Length {{{optime}}} Seconds
UU Cost {{{uu_cost}}}
First appearance {{{firstappearance}}}
Last appearance {{{lastappearance}}}
ID IC2:{{{id}}}
Flow Speed {{{fluidspeed}}} m/s
Player Speed {{{movespeed}}}

The Water Mill produces EU by having a Water Bucket placed in its lower slot; alternatively, the Water Mill can be immersed in water, allowing it to generate EU passively.


Grid Stick.png
Grid Wooden Planks.png
Grid Stick.png
Grid Wooden Planks.png
Grid Generator.png
Grid Wooden Planks.png
Grid Stick.png
Grid Wooden Planks.png
Grid Stick.png
Grid Water Mill.png

Water Mill

Water Mill

See: Crafting Guide


The Water Mill has two modes of operation:

  • Manned: The Water Mill is filled manually by placing Water Buckets or a Water Cell in the lower slot
  • Unmanned: The Water Mill is submerged in water

Optionally an RE Battery can be placed in the upper slot.

The Water Mill will charge the battery or output power at a rate of:

  • Manned: 1 EU/t A single water unit produces 1000 EU and the Water Mill can store 4 water units worth of water.
  • Unmanned: 0.010 EU/t per block of adjacent water. The maximum output of an unmanned Water Mill is 0.25EU/t (3x3x3 cube of water with the mill in the middle, plus 1 piece of cable to direct the energy = 25 water tiles).
Grid RE Battery.png
Grid Water Bucket.png

Grid RE Battery.png
Grid Water Cell.png


Input Water Buckets
Output Variable:
  • 2 EU/t (manned mode, consumed water item)
  • 1 EU/t (manned mode, not consumed water container)
  • # of water blocks x 0.01 EU/t (unmanned mode)
Storage 2 EU

Water Towers

A Water Mill on its own will produce very little EU if left unmanned, even when completely surrounded in water. So it's better to build compact clusters of them. A 'water tower' is one of many methods.

A water tower is a number of watermills, usually stacked, such that they all feed to the same energy storage device and are surrounded by water. For best results, arrange the tower sections so that there's at least a one block layer of water around each watermill. Below is an example of a horizontal layer of a watermill.

Watermill example 1.png

Detailed Mechanics

A Water Mill only uses water that directly surrounds it (a 3x3x3 box with the Water Mill in the center). Each block of water adds roughly .01 EU/t to its overall output.

Using the water tower design from above will result in each Water Mill being surrounded by 21 water blocks like so:

Watermill example 2.png

21 * 0.010 = 0.21 EU/t from each watermill, 0.84 EU/t from each layer of watermills. So, to run a Macerator non-stop 2.5 layers (10 watermills) are needed (2.1 EU/t)

Some notes about the behavior of some Water Mills that were studied:

  • Water Mills can 'share' the same water block with seemingly no effect.
  • Using flowing water instead of still water had no noticeable effect.
  • A Water Mill suspended over water will still react to the water below it even though the watermill is not visibly touching the water.
  • Water Mills are not noticeably affected by rainfall.


For those who prefer old-school energy generation, we invented this nice little thingy.

The Water Mill can produce energy... by using WATER, isn't that suprising? Sounds simple, doesn't it? But i hope, you didn't forget the good ol' times? You know, the times where people were actually WORKING for their lives? The Water Mill is for THAT kind of people. If you want to use it, fine, but keep in mind it needs a constant supply of fresh water to charge RE Batterys.

If your mouse-clicking finger hurts, don't blame us, HAYO!

Interaction with other mods

  • Liquid Transposers from Thermal Expansion may be used to fill water buckets. Otherwise, deployers from Redpower may be used. Or, you could just pipe buckets in and out of a vanilla dispenser facing an infinite water source.
  • GregTech adds a method of "recycling" used water mills back into generators. (Shapeless)
Grid Water Mill.png

Grid Water Mill.png

Grid Generator.png


Version Changes
Industrial Craft²
0.90 Water Mill was re-released.
1.81 Any water container may now be used as a substitue for a Water Bucket in a Water Mill (such as Water Capsules from Forestry, Water Cells and Water Bottles). However, they will not be returned upon use.
1.103 Any water container that is returned upon use (i.e. Water Bucket will only yield 1 EU/t in a Water Mill.