Pumped storage hydro-power-or PSH is a great concept to store energy generated during low demand for electricity. The PSH work with very low efficiency only when wind is blowing, or sun is shining or hydro-powered stations have water conserved and it is raining. Why the PSH are low efficiency investment????, The answer is simple, if PSH will work with efficiency 70%, and will store energy from wind power which has efficiency 35% (the best) then every kwh generated with wind power will end to 25%. And if the PSH will be related to Sun energy with efficiency 15%, then the results will be 10% toal efficiency. All these investment will need and investment on energy distribution, and this will decrease the overall efficiency. The world of energy is very simple, clean renewable energy on demand can be generated using gravitational power and this will increase the efficiency of any generator who provide with 10% or 25%, 4-10 time more energy with less capital. Call and let further discuses for collaboration.