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If you've found some steel from Immersive Engineering, Thermo Electric Generators are a cheap, reliable power source that can be run on lava and water, or uranium/yellorite blocks and ice. It's pretty solid power and will keep you going until you move to something more potent.
Water wheels and windmills are also good options. The latter can then be upgraded with sail cloth to produce more power.
Water wheels and windmills are also good options. The latter can then be upgraded with sail cloth to produce more power.