Geo-thermal power plant, Svartsengi, Iceland

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

Miabi water reservoir, Mbuji Mayi, Eastern Kasai, Democratic Republic of Congo, Africa

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

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

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

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

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

Red light art installation in the entrance tunnel to the underground Fljotsdalur hydro power station, part of Karahnjukar a massive new contorversial hydro electricity project in North East Iceland, Polar Regions

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

Workers use bicycles to get around the underground plant at the 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

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

Hydropower plant, village El Naranjo in the northeastern uplands, Nicaragua, Central America

Mill wheel

Mill wheels

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

Hall with turbines and generators, Walchensee Power Plant, Bavaria, Germany, Europe

Hall with turbines and generators, Walchensee Power Plant, Bavaria, Germany, Europe

Old mill wheel, Waal, Bavaria, Germany, Europe, PublicGround