There is a static electricity generator that uses falling water to generate a charge.
If you are using Hell, does that mean you can use steam?
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You can use an alternator/generator/motor with a waterwheel or turbine to convert to electrical energy which is the main way it's done.
You could also move things up and down in a similar fashion to make electricity similarly to a windbelt project.
Really amot all waer driven generators use a turbine or waterwheel as a means of converting to rotary motion then they use a generator, like a car alternator or even a motor, look at a few of the wind turbine projects to get the basic idea.