That is very interesting my friend but that sounds strangely similar to our dams here on earth, in particular, the Hoover Dam, which uses turbine energy which is obviously assisted by the shear force of the Mother Nature and her water. The similarities are screaming at me. For one, the whole idea of water making electricity automatically gives u this shimmering thought of our dams, but then lets think about the shear force of water being used to assist man made machines that ultimately end up producing electricity. Becuz ur idea is obviously using the shear force of water to assist the 4 kilogram mass which was man-made. So to be honest i don't think your idea is a bad one, it just has small infallibility's which cant be ignored, but what i think it comes down to is actual costs buddy. Not only costs of production but work force and all the people hours that are not only need for supervision, but for something else we all know as maintenance; not cheap! We also gotta look at just how much energy we're actually generating here. Cuz if its minimal, and thus, the costs outweigh the production of energy, then this whole idea goes entirely out the window!See, now you never said how much energy u could draw from the lifting of 1cc of water to 10c of height vs. a 4 kilogram pay load. Becuz if the amount of energy is far past substantial THEN MY ARGUMENT GOES OUT THE WINDOW! HA!