You could just run them from an array of crusibles. It would be way too convenient.
You wouldn't need any other generators.
Also lava power is pretty piss poor in implementation.
I'd love to see a mod implement it in a more real world way.
Where you essentially pump water in to a naturally occurring hot spot, in this case lava and it will cool a block of lava in a radius every so and so. This would produce steam for generators.
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