Geothermal Generators accept both Lava Buckets and Lava Cells.The Lava Cells are stackable and thus require less maintenance, but cost 4 Tin ingots to produce.
It works on the same basic principle as normal Generators do, except in this case they use the heat of Lava to generate electricity.
For example, if you have a Geothermal Generator hooked up to an MFE Unit which is powering a Rotary Macerator (or any other machine with a small but constant power drain), a normal Generator will start cooking one coal and cook off the entire thing regardless of whether or not all the power is used.
However, a Geothermal Generator will rapidly turn on and shut off, only using lava when needed.
As with all Generators, the lava fuel source is inserted into the lower slot, and optionally a RE Battery in the upper slot.
Alternatively, lava may be supplied through Build Craft Waterproof pipes.
It does not need to be pumped into the top; it can be pumped in from any side.39 diamonds)* (*): Assuming you're using an extractor for the sticky resin to get 3 rubber/sticky resin.The Geothermal Generator will connect to Waterproof Pipes, and will receive Lava carried by them.It will also accept lava directly from an adjacent Build Craft Pump.Lava source blocks (obtained from NEI or crafted using UU-Matter) cannot be used.It has an advantage over normal generators in that it does not waste power.