I hooked up different BuildCraft Engines to show how any RF source can power the reactor.
The Crafting Recipe.
The slot in the middle is where the block for the biome goes. Different types of wood, logs, leaves, saplings, flowers, and plants all correspond to different biomes. The bar displays how much power is in the machine.
Comparison of before and after the machine changed the biome to desert.
Comparison of before and after conversion into a Jungle biome.