41.   The Dokan Dam, the largest hydroelectric dam in Iraq, has changed hands three times in recent fighting.

42.   The generators include hydroelectric dams, the cheapest type of power plants, and fossil fuel plants.

43.   The generators include hydroelectric dams, which produce electricity cheaper than other types of plant, and fossil fuel plants.

44.   The generators include hydroelectric dams, which produce electricity cheaper than other types of plants, and fossil-fuel and wood-chip powered plants.

45.   The lake was created by a hydroelectric dam, and the islands formed as the lake filled up, becoming, in effect, miniature isolated ecosystems.

46.   The network of hydroelectric dams long gave the region a cheap and seemingly inexhaustible supply of power.

47.   The mine needs power, so there are plans to build a hydroelectric dam nearby.

48.   The others are hydroelectric dams, habitat and harvesting.

49.   The Tennessee Valley Authority will control the river during training and the Games through its system of hydroelectric dams.

50.   The Salmon escaped larger hydroelectric dams because it was lower on the list than some other rivers, such as the Snake or Columbia.