The gigantic wind turbines in Donegal on the west coast of Ireland are not only standing on the geographical limits of Europe -- they are also on the cutting edge of a revolutionary technology for storing large amounts of energy from wind power.

Battery storage could be especially useful when wind power feeds into a grid that belongs to a so-called "island" such as in the UK and Ireland, but also in Spain on the Iberian Peninsula— in effect an electrical island with limited interconnections with France in the north and Morocco in North Africa.