The Jinping II hydroelectric power station is being built in the province of Sichuan. The backbone of the power station is made up of a total of four parallel tunnels at a distance of 60 meters apart. After diverting sufficient river water, they take a shortcut through the mountain along a u-shaped bend of the river. The already existing downward slope means that it is not necessary to build a retaining dam. A difference in altitude of 310 meters between tunnel inflow and outflow (150 kilometers down the river) provides for sufficient driving energy in the turbines of the hydropower plant which generate electrical power of 4,800 megawatts.
For constructing one of the water tunnels, Herrenknecht's largest gripper TBM to date was set up for the start of operations in November 2008. It was at the same time the first machine of this type from Herrenknecht for China. This gigantic machine with 12.40 meters in diameter excavated its way through the rock employing, as it does, 4,900 kilowatts of drive power. Mechanized tunnelling was concluded in February 2011 after 6.2 kilometers.