Las Vacas Hydroelectric plant

The Contract for the Hydroelectric Plant Las Vacas has required the excavation and lining of a 4500m tunnel and overall 5,1km length for a total plant capacity of 45MW. The excavation has gone through adverse geological conditions with presence of geological faults, water and pressure. 
Of the overall excavation, 2km have been built through a 3,43m diameter TBM  and the remainig 3,1km have been excavated with a 4m diameter through conventional methods.