These turbines represent 12 per cent of B.C. Hydro's power production. The replacement will ensure reliability and availability of the units, as well as improve efficiency and capacity. With the upgrade, an addition 177 gigawatt hours of energy will be available annually with the same amount of water used.
The project is now in the implementation stage. The first turbine unit is expected to be operational in November 2012, with all units ready by mid 2015.
The success of the replacement of these units also depends on other projects ongoing at GMS.
Before the turbine replacement can begin, both of the station's powerhouse cranes need to be upgraded to improve operation reliability. The upgrade will cost $5.7 million and is currently in the final design stage. The first crane is expected to be in service in December of this year and the second in March.
The crane upgrade also needs to be finished before the rotor poles on Units 1-4 can be rehabilitated. The $22 million dollar project is scheduled to align with the turbine replacement.