Three Gorges Dam calculated based on the average flow rate at the dam site, assuming the water level is 175 m and the plant gross efficiency is 90.15%. The actual power output in 2008 was obtained based on the monthly electricity sent to the grid. The Three Gorges Dam reached its design-maximum reservoir water level of for the first time on October 26, 2010, in which the intended annual power-generation capacity of 84.7 TWh was realized. In 2012, the dam's 32 generating units generated a record 98.1 TWh of electricity, which accounts for 14% of China's total hydro generation. The State Grid Corporation
Gorges State Park recovered from the interference of man to provide a thriving and unique habitat. One of the most damaging interferences to the Gorges environment occurred in 1916 when the dam containing Lake Toxaway broke. Record amounts of water gushed southward down the Toxaway River, destroying the communities in its path, scouring the gorges and leaving piles of debris 15 to high. Following the flood, local citizens eventually sold large land tracts in the Gorges to Singer Sewing Machine Company, which logged most of the land. Then, in the 1940s and 1950s, Singer sold the land to Duke Energy Corporation. The corporation