Open Hydro, Orkney Islands, UK. The Orkney Islands are geographically and meteorologically unique. Their location at the meeting point of the Atlantic ocean and the North Sea leaves the islands exposed to incessant heavy winds and waves and exceptionally strong currents and tides. Abandoned test site for tidal energy at the Fall of Warness off the island of Eday. The open centred turbine was installed in 2006 and was the first tidal turbine to deliver electricity UK's national grid.