A recent answer suggested using "methane and other hydrocarbons" for geothermal energy recovery on the Moon.
You would not need to use water [on the moon]! You could use the methane and other hydrocarbons that could be used.
As organic compounds I have difficulty imagining their presence on Earth's Moon. I know they are plentiful on both Earth & Titan, but not sure about our Moon.
Are there hydrocarbons on the Moon?
If so how did they get there?