I thought of this decades ago, and I am sure many others have too. And no the math does not come out favorably. While technically feasible, the cost is prohibit

I thought of this decades ago, and I am sure many others have too. And no the math does not come out favorably. While technically feasible, the cost is prohibitive. The reason is simple, you need LOTS OF WEIGHT to get any appreciable storage capacity. Try it yourself: http://hyperphysics.phy-astr.gsu.edu/hbase/gpot.html http://hyperphysics.phy-astr.gsu.edu/hbase/gpot.html Note that 1 joule = 2.77777778 × 10-7 kilowatt hours