The geographic distribution of electric power plants is dependent on the method of power generation. The power plants that use gas, internal combustion power, and combined cycle power are located around large cities or industrial complexes with large demands. They also are located along coastal areas with convenient access to raw materials and water for cooling. Internal combustion power plants are located close to small cities or islands along the west coast, taking advantage of their small and light generators. Nuclear
power plants are located on stable ground along the coastlines to ensure safety. Hydraulic power plants are located on the rivers that have a large drop in elevation and abundant water ow. Alternative energy power plants primarily appear in windy areas such as Gang- won-do and Jeju-do. Cogeneration energy facilities are located near large residential areas in need of hot water supplies, such as the Seoul Metropolitan Area.