Photo: Workers lowered the 137-tonne Mica 5 turbine into the new, fifth generating unit on April 11. The 6.45-metre-wide turbine will spin at 133 rotations per minute when operational, meaning it had to be centred within a fraction of a millimetre. The turbine was built in Germany and made the voyage here in 2013. The generator is the first of two to be installed as part of an expansion at Mica Dam that will add new fifth and sixth generators. Crews will now complete construction work on the fifth unit, and prepare for the installation and completion of the sixth unit in October, 2015. The $900-million upgrade to the dam also includes replacing the aging switchgear at the dam.