We know that water rises in a glass capillary owing to the surface tension phenomenon. If we make an arrangement as shown in the attachment, (read Water instead of mercury in the attachment, I got confused there) & do the following procedure. The valve at the bottom is open, & the one at the top is closed. 1) When the water rises, close the valve at the bottom. 2) Then open the valve at the top. The water should come out from the branch & flow downwards. We put a collector flask just at the opening (not shown in the drawing), & put a set of similar arrangements above that flask. With the help of large number of capillaries & levels we should be able to rise significant amount of water at a particular height, store it there. Then use the potential energy of stored water to drive a turbine ( similar to hydro turbines),& generate electricity. Is this possible? If not Why?