A few days ago, I found a video on youtube that used deployers, buckets, pneumatic tubes and water mills to generate a reasonable amount of power. I modified this sytem and replaced the water mills with Geothermal generators. If you add another deployer opposing the first one and put a volcanite amulet with a fully charged klein star in it, it will copnstantly spawn lava, collect it and send it to the generators. The water mill video is here:
(If asked I will post my own video)