A Geothermal Generator works on the same basic principle as normal Generators do.
Geothermal generators use the heat of Lava to generate electricity. With the release of IC², the generators accept both Lava Buckets and Lava Cells. The latter are stackable and thus require less maintenance, but cost Tin to produce.
Note for those using Buildcraft: the Geothermal Generator will now connect to Buildcraft's Waterproof Pipes, and will receive lava carried by them. It will also accept lava directly from an adjacent Buildcraft Pump.
As with all Generators, the lava-based fuel of choice is inserted into the lower slot, and optionally an RE Battery in the upper slot. The Geothermal Generator will charge the battery or output power at a rate of 20 EU/t.
A single Geothermal Generator can store 24 units of lava - thus, inserting a full stack of Lava Cells will instantly use up 24 of them and fill out the lava gauge. Unlike the furnace, the Geothermal Generator does not consume the bucket when a lava bucket is used as fuel. It is returned to your inventory.
Storage: 480,000 EU
Input: Lava Buckets or Lava Cells or Placed next to a Pump
Output: 20000 EU per Lava Bucket or Lava Cell at a rate of 20 EU/t
If you have the BuildCraft mod installed, you can effectively generate infinite power. Simply connect one (or more) of these magical machines to a BuildCraft pump pumping from a lava lake in the Nether.
Also, if you have Eloraam's RedPower installed, you can pump the lava from the volcano** into the generator.
* Not responsible for limitations due to laws of physics.
** Not quite as "infinite" as the Nether.
- Using the Geothermal Generator with a connection to a Pump will provide an output of 30,000 EU instead of 20,000. For it to work properly, the Pump has to be above a lava source tile, and the Geothermal Generator needs to touching the Pump.
Additionally, an Empty Cell needs to be placed into the top of the pump (for unknown reason), and the initial powering of the pump can be done by placing 1 Redstone in the bottom slot of the Pump. Note:: Though it gives an increased EU (30,000), there is still a 200 EU per operation cost for the pump. The Geothermal Generator will charge the adjacent pump, for a total output of 29,800 EU per lava source tile.
- With the Tekkit mod pack 3.0.3, steam engines can burn lava buckets and transfer the power through an engine generator. The engine generators are expensive, and buckets of lava are complicated to deal with, but it would produce 50,000 EU per lava bucket as opposed to 20,000 EU.