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Barragem do Alqueva dam, part of the multipurpose water management project on the Rio Guadiana river, hydro-electricity generation electricity power lines, Moura, Portugal, Europe

The Clyde Dam on the River Clutha, hydro electric project completed in 1989, Central Otago, South Island, New Zealand, Pacific

Hydro canal between Lakes Tekapo and Pukaki in a hydro-electric power scheme in Canterbury, South Island, New Zealand, Pacific

Rundle Hydro Power Plant above Canmore, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Guthega power station, part of the Snowy Mountains hydro scheme, New South Wales, Australia, Pacific

Guthega Dam supplying the water to power Guthega power station as part of the Snowy Mountains hydro scheme, New South Wales, Australia, Pacific

Electricity pylons traversing Bwlch Y Ddeufaen on the edge of the Snowdonia Mountains, North Wales, United Kingdom, Europe

Dinorwig power station visitor centre, called Electric Mountain, in Llanberis, Snowdonia, North Wales, United Kingdom, Europe

The pipe carrying water from Coedty reservoir to Dolgarrog Hydro Power Station in Snowdonia, North Wales, United Kingdom, Europe

Electricity pylons traversing Bwlch Y Ddeufaen on the edge of the Snowdonia Mountains, North Wales, United Kingdom, Europe

The turbine hall in the Fljotsdalur hydro power station, part of Karahnjukar, a massive new controversial hydro electricity project in North East Iceland, Polar Regions

Avalanche protection for the high voltage power cables as they exit the underground Fljotsdalur hydro power station part of Karahnjukar a massive new controversial hydro electricity project in North East Iceland, Polar Regions

Guthega Dam supplying the water to power Guthega power station as part of the Snowy Mountains hydro scheme, New South Wales, Australia, Pacific

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - Tidal Generation Limited - backed by Rolls Rpyce -TGL is are currently operating a 500kWe concept demonstrator unit at The European Marine Energy Centre (EMEC) Tidal site in Orkney. This has been generating since September 2010 and provides power for up to 300 homes.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - Tidal Generation Limited - backed by Rolls Rpyce -TGL is are currently operating a 500kWe concept demonstrator unit at The European Marine Energy Centre (EMEC) Tidal site in Orkney. This has been generating since September 2010 and provides power for up to 300 homes.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - Tidal Generation Limited - backed by Rolls Rpyce -TGL is are currently operating a 500kWe concept demonstrator unit at The European Marine Energy Centre (EMEC) Tidal site in Orkney. This has been generating since September 2010 and provides power for up to 300 homes.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - Tidal Generation Limited - backed by Rolls Rpyce -TGL is are currently operating a 500kWe concept demonstrator unit at The European Marine Energy Centre (EMEC) Tidal site in Orkney. This has been generating since September 2010 and provides power for up to 300 homes.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - out testing with the Scotrenewables machine off Kirwall - Scotrenewables Tidal Power Ltd is a renewable energy research and development business based in the Orkney Islands.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - Tidal Generation Limited - backed by Rolls Rpyce -TGL is are currently operating a 500kWe concept demonstrator unit at The European Marine Energy Centre (EMEC) Tidal site in Orkney. This has been generating since September 2010 and provides power for up to 300 homes.

Pelton Wheels outside Dinorwig hydro power station visitor centre in Llanberis, Snowdonia, North Wales, United Kingdom, Europe

Fljotsdalur hydro power station, part of Karahnjukar a massive new contorversial hydro electricity project in North East Iceland, Polar Regions

Guthega Dam supplying the water to power Guthega power station as part of the Snowy Mountains hydro scheme, New South Wales, Australia, Pacific

Fljotsdalur hydro power station, part of Karahnjukar a massive new contorversial hydro electricity project in North East Iceland, Polar Regions

High voltage power cables exiting the underground plant towards pylons outside, Fljotsdalur hydro power station, part of Karahnjukar a massive new contorversial hydro electricity project in North East Iceland, Polar Regions

A display board showing the amount of renewable energy being generated by the micro hydro turbine in the grounds of Rydal Hall, Lake District Cumbria, England, United Kingdom, Europe

Valves that control the water flow into the turbines at the Fljotsdalur hydro power station, part of Karahnjukar a massive new contorversial hydro electricity project in North East Iceland, Polar Regions

Pipeline taking water to Guthega power station as part of the Snowy mountains hydro scheme, New South Wales, Australia, Pacific

Output from the turbines, the main high voltage electric cables from the underground plant to pylons outside, Fljotsdalur hydro power station, part of Karahnjukar a massive new contorversial hydro electricity project in North East Iceland, Polar Regions

A water turbine on the dam at Lake Emerson on the French Swiss border to generate hydro electricity, France, Europe

Coedty dam which supplies the water to power Dolgarrog Hydro electric power station, North Wales, United Kingdom, Europe

A water turbine on the dam at Lake Emerson on the French Swiss border to generate hydro electricity, France, Europe

The turbine hall in the Fljotsdalur hydro power station, part of Karahnjukar, a massive new controversial hydro electricity project in North East Iceland, Polar Regions

Surveyors on the dam at Lake Emerson on the French Swiss border to generate hydro electricity, France, Europe

Electricity lines taking power from the Murray 1 power station, part of the Snow Mountains hydro electric scheme, New South Wales, Australia, Pacific

Pipes feeding the Murray 1 power station, part of the Snow Mountains hydro electric scheme, New South Wales, Australia, Pacific

Rudolf-Fettweis-Kraftwerk hydroelectric power plant on the Murg river, Forbach, Black Forest, Baden-Wuerttemberg, Germany, Europe

Aerial view, Koepchenwerk pumped-storage plant with reservoirs owned by RWE, a German electric power company, Ruhr river, Ruhrtal valley, Herdecke, Ruhrgebiet area, North Rhine-Westphalia, Germany, Europe

Pipes from Lake Walchen to Lake Kochel, Walchensee Hydroelectric Power Station, Kochel, Upper Bavaria, Bavaria, Germany, Europe

Turbine Hall, powerhouse of the Walchensee Hydroelectric Power Station, hydroelectric power from Lake Walchen to Lake Kochel, Kochel, Upper Bavaria, Bavaria, Germany, Europe

Turbine hall of Walchensee Hydroelectric Power Station, Kochel, Upper Bavaria, Bavaria, Germany, Europe

Aerial view, pumped storage power plant, pumping stations, PSW, reservoir in Roenkhausen, Kreis Olpe county, Sauerland region, North Rhine-Westphalia, Germany, Europe

Metal pipes at the Walchenseekraftwerk Hydroelectric Power Station, Kochel am See, Bavaria, Germany, Europe

Electricity generation by hydraulic power at the Griesheim barrage, dam with sluice, Frankfurt am Main, Hesse, Germany, Europe

"Central Hidroelectrica 15 Septiembre", hydroelectric power plant on Rio Lempa, the plant operator was accused of having aggravated the flooding in the lower reaches of Rio Lempa because the sluices were opened very late, El Salvador, Central America, Lat

The Iguazu Falls at the border between Argentine and Brazil, Cascades in the devils throat and rainbow

Aerial view, pumped storage power plant, pumping stations, PSW, reservoir in Roenkhausen, Kreis Olpe county, Sauerland region, North Rhine-Westphalia, Germany, Europe

View from Highway 89 Glen Canyon Bridge on Glen Canyon Dam, Page, Glen Canyon National Recreation Area, Arizona, United States of America, PublicGround

The hydroelectric Norris Dam and Reservoir on the Clinch River, operated by the Tennessee Valley Authority, Norris, Tennessee, USA, America