El Hierro, the smallest of the Canary islands, commissioned an open loop pumped hydro plant specifically designed to supplement the islands wind turbines. The system will be made up of two reservoirs of water, a wind farm, a hydroelectric plant, a pumping station and a diesel powered facility (already in existence). The lower reservoir will have a capacity of up to 150,000 cubic meters of water, while the upper reservoir, which is a natural volcanic caldera, will be able to store up to 556,000 cubic meters. The five turbine wind farm will have installed capacity of 11.5 MW; the hydroelectric plant, with four Pelton turbines will have installed capacity of 11.3 MW and the pumping plant 6 MW. The Llanos Blancos plant has installed capacity of 12.7 MW.

Read the 6/27/14 release: http://goo.gl/qBP9qu

Open-loop Pumped Hydro Storage