Abstract: During the 12th Five-Year Plan period (2011-2015), a total of 5 660 MW installed generation capacity, including 5 565 MW in thermal power and 95 MW in hydropower, will be added to the Urumqi Changji power grid. In addition, it is planned to add another 1 250 MW wind power to the grid. The thermal power units account for about 66% of the total added coal-fired units, which will continue to increase the power grid's pressure for peak load regulation. Based on the load characteristics of the Urumqi Changji power grid, this paper analyzes the surplus and loss of peaking capacity in Urumqi Changji power grid and obtains the demand capacity for pumped storage power station in Urumqi Changji power grid.

Key words: pumped storage power station, peaking regulation capacity, integrated thermal power peak rate