China will build a US$17.6 billion wind power farm in Gansu province, Reuters reported. State media said the project will begin construction in two weeks, and will ultimately generate 20 gigawatts (GW) of power, prompting some to refer to the project as the "Three Gorges Dam on land." The project will be constructed in Jiuquan city, which officials estimate could support up to 40 GW of wind power farms. Beijing’s total wind power target for 2020 is 100 GW, so the project in Jiuquan, if successful, would mark significant progress toward accomplishment of that goal, and toward China’s larger goal of increasing its usage of renewable energy sources to 15% by 2020. Xiao Ziniu, director of the National Climate Center, told state media that China’s onshore wind power potential has been estimated at 700 GW to 1,200 GW with another 250 GW of potential offshore wind power capacity.