Actually those "lazy ways" of making power Does take power. Making the plates, ingots, and refined irons all take energy to make them. So every generation of power take some form of power, be it burning, eu, mj, or bt.
Maybe I should've said a "continuous investment of power to make more power". I mean Magmatic, Combustion or Biogas engines also take energy to make, not as much as Solar Panels, but still. However after you've made them they need power to make their own fuel (pumping lava, smelting rack, refining oil, etc.), unlike Solar Panels who don't need anything after being created.
That aside, the point I was trying to make is that any sort of power production requires an investment (most a continuous investment, others a 1 time investment) which means Water Bottles can be more effective than Water Buckets even though they need some power to keep the loop going.