solar and wind are great, but they cant work on their own, its not reliable enough, you need a baseline power generation that stable and predictable, wind and solar has to be a compliment to coal or nuclear or hydro.,(reply>), Tidal is the answer. Tidal energy is incredibly predictable. You can look up a tide chart and know exactly how much energy you'll produce on the third Tuesday in March three years from now.,(reply>), Coal isn't needed, as the UK has proven.