In Ireland there have been studies using sea-facing valleys to store pumped sea-water. There are an order of magnitude more of these (left-over from the last ic

In Ireland there have been studies using sea-facing valleys to store pumped sea-water. There are an order of magnitude more of these (left-over from the last ice-age) than river valleys for pumped hydro storage. The spirit of ireland group looked at them. When we really need the stored energy, this plan will get dug up again. Reference: http://www.sciencemag.org/news/2012/02/massive-energy-storage-courtesy-west-ireland http://www.sciencemag.org/news/2012/02/massive-energy-storag...