Great Ruaha River is completely dry for three months at a stretch
Photograph: Thomas Kruchem
The country at the time was reliant on water to produce more than a third of its power.
The hydro plants struggle to operate in monsoon or poor rain fall conditions and they had to shut down production to protect the machinery from damage being caused from air getting into the system.
The country at the time was consuming 870 MW of electricity but during the drought was only generating 105 MW, leaving millions battling power cuts.
Gas generators were gradually being brought on stream to ease the crisis but demand will increase over the coming years as Tanzania goes forward with its plans to hook its population up to the grid. At the time, less than a quarter of families had electricity in their homes.
Full article Telegraph