Adaptable Hard Rock TBM
Changes Diameters Mid-Bore
- The project will supply up to 898 million kWh annually
- An intermediate breakthrough at the headrace tunnel was achieved in December 2010
- The adaptable machine is excavating tunnels of differing sizes
- The machine underwent an intermediate component change from 4.8 m (15.8 ft) to 4.0 m (13.1 ft) in diameter