As with hydro storage, efforts are under way to adapt the basic concept of CAES to make it more efficient and easier to install.

ECONOMIST: Energy storage

One critically important element used today is hydro storage capacity in neighboring Norway (which is supplied by 99% hydro) and Sweden (over 50% hydro), supported by robust interconnection transmission lines.

FORBES: Denmark: 1,000 Megawatts Of Offshore Wind, And No Signs of Slowing Down

The Danes have been blessed with an enormous wind resource, and with a geographic location that places them between much larger markets (that they can sell to and buy from), as well as huge hydro storage potential to the north.

FORBES: Denmark: 1,000 Megawatts Of Offshore Wind, And No Signs of Slowing Down