The Solution is NOT Difficult - Use wind to produce the energy and to create hydrogen from water, and store the hydrogen in high pressure takes underground close to the wind farms.  Burn the the hydrogen when power is needed.,(reply>), Two problems with that:<br><br>1.) hydrogen being the lightest element in the universe, even as a diatomic gas, means that it’s very difficult to contain in large quantities at high pressures without leaks. It can literally squeeze between iron atoms in a steel container if the pressure is high enough, making everywhere a potential leak<br><br>2.) the process of electrolysis and conversion back into water + electricity is only about 40% efficient at most due to heat losses, much less than the energy conversion of a battery.