Mass: 5t
Cost: 2,000 Equipment
Research: Large Electrics

The Hot Springs Geothermal Plant uses geothermal energy from the planet or moon to generate ElectricCharge. In game this resource is known as GeoEnergy. You'll need to land on a geologically active world in order to make use of this generator, but not all planets and moons are geologically active. The table below shows the likelihood that a world will be geologically active and thus have GeoEnergy in your current game:

World	Percent Chance	Notes
Sun	0%
Moho	70%
Eve	100%
Gilly	0%
Kerbin	100%
Mun	85%	Apparently Earth's Moon is geologically active!
Minmus	0%	Wiki suggests that it is a captured comet
Duna	70%	Mars could be active
Ike	70%
Jool	0%
Laythe	100%
Val	70%
Tylo	60%
Bop	0%	Captured asteroid, too small to be active
Pol	0%	Captured asteroid, too small to be active
Dres	0%	Asteroid, too small to be active
Eeloo	100%	Pluto is active!
If a world is not on the above list then it has a base 70% chance of having GeoEnergy.

In addition to GeoEnergy, the Hot Springs needs 5,000 liters of Water to work its steam turbines. Built-in condensers will reclaim the steam; there are slow losses over time, however. You can either drill for water on site or ship in your own supply. If you don't have enough Water stored in the Hot Springs, then the generator will not function.

Below is the ops window for the Hot Springs:

There is one converter for the Hot Springs:

Designer's Notes

You can't have a mod based on geology research without having a geothermal energy plant. I wanted something that would work practically everywhere, but some on the forums suggested to limit the plant to a few planets and moons. Then I found out that the Moon isn't geologically dead! That's all I needed to know to apply my "plausible deniability" approach to physics in order to let the Hot Springs work on many planets in the Kerbol system.

The latest version of the Hot Springs makes it work more realistically without overly complicating the system or introducing too many resources. I think it's a nice balance between really realistic and good game play.