Supply and demand are always achieved on the grid. One issue for renewable energy is how to store the power which may be generated during low demand for use during high demand rather than have it go to waste.
" ... hope is that bulk storage will allow solar and wind farm operators to provide electricity to the grid--regardless of wind and sun conditions--making the electricity they provide more valuable."
Storage devices include batteries, flywheels, ice, capacitors and water and vary in their storage capacity.
Check out this slide show of some novel grid energy storage devices. SLIDE SHOW LINK
Via: TechRepublic LINK
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Category: Energy Grid