Pumped storage power generation, which is a kind of hydro-electric power generation, is to produce electricity by pumping up water from the lower reservoir to the upper reservoir and storing it during the time band when the power demand is low. Then dropping the stored water into the lower reservoir. Yangyang Pumped Storage Power Plant was completed in September 2006 and boasts the largest capacity of 1,000MW (250MWx4 units) in the country, with its peak height of 819m being the highest in Asia.

It contributes to supplying good, quality stable power, since the time required for starting and stopping operation is short and the adjustment of output is easier compared to the thermal and nuclear power plants, and contributes to reducing the power generation cost through the improvement of energy efficiency using midnight power. In addition, a turbid water treatment facility for prevention of water quality, has been installed and is in operation. Efforts to preserve the eco-system by installing the fish way in large scaled dams has been made for the conservation of resources of finny tribes such as salmon, sweet fish, and trout, the first in the country.

Meanwhile, 2 sets of wind power generators in the 1,500KW class, were installed in May 2006. Both sides of the upper dam have been operating since the upper dam area is located 937m above the sea level, which is the place where wind power resource is abundant with the annual average wind speed reaching 8m/sec, and is registered as the CDM project(Clean Development Mechanism) in the UN Climate Change Convention (UNFCCC) in 2007.

In addition to these, it also has a small hydro-electric power plant on the lower dam to produce electricity using the hydraulic energy originated in the process of sending water to the river. Yangyang Small Hydro-electric Power Plant in the 1,400kW (700kWx2 units) class, was completed in August 2005. It is also registered as a CDM project in the UN Climate Change Convention (UNFCCC), together with the Yanyang Wind Power Plant.