A fault in the bulk supply transmission system at the Juja substation in Nairobi has resulted in a power outage affecting many parts of the country.
Kenya Power says the hitch occurred around 4:30pm on Thursday, affecting electricity supply to the Nairobi, Coast and Mount Kenya regions.
However, the power supply to the North Rift, Central Rift and west Kenya areas was not affected as they are served mainly from the Turkwel and Sondu Miriu hydro stations.
“The outage occurred following a fault in the bulk supply transmission system at Juja substation in Nairobi. Our technical teams are working to rectify the situation and restore supply to the affected areas,” said Kenya Power in a statement sent out an hour after the blackout hit.
The Juja substation handles mainly power from the Olkaria plants and Seven Folks hydro dams.
The substation suffered a similar failure in April 2014, sending nearly the whole country into darkness for about two hours.
In the past, Kenya Power has blamed frequent power outages on vandalism and an old power distribution infrastructure that saw electricity poles fall off during heavy rains.
Last year, the company announced plans to invest Sh109 billion in the next four years to expand its network and reduce power losses.
The investment will comprise construction of more than 200 substations, installation of transformers and building of low-voltage power distribution lines.