Nabang Hydropower Station
China, Yingjiang
2009 – 2011
Hard rock - fast tunnelling

Nabang is in Yunnan province not far from the Burmese border. This is where a diversion canal HEP plant was constructed comprising master control unit, diversion tunnel and the actual power station. The plan was for a 4.5-meter-diameter diversion tunnel 9.75 kilometers long. Following commissioning, the power plant is to be run with an installed capacity of 180,000kW.

The geology meant parts of the tunnel were to be excavated by machine (7.4 kilometers) and the others were to be excavated conventionally. A part of the tunnel had to be driven under considerable overburdens of up to 600 meters. The tunnel crew celebrated breakthrough on September 10, 2011 after having driven monthly best performances of up to 475,5 meters into the rock.

Data Sheet

Country, Location

China, Yingjiang


2009 – 2011




Predominantly gneiss with biotite, slate hornblende and granulite

Tunnelling length

7,371 m

Machine Data

1x Gripper TBM:
Diameter: 4,500 mm
Lining method: Rock support
Cutterhead power: 1,400 kW
Torque: 1,403 kNm

Your contact person Contact us

Steffen Dubé President and General Manager Herrenknecht Tunnelling Systems USA Inc.
Gerhard Goisser Commercial Manager Herrenknecht Tunnelling Systems USA, Inc.