NAIROBI—Power was restored to parts of Kenya after a nationwide blackout lasting several hours which was thought to have been caused by a fault on a transmission line, electricity distributor Kenya Power said on Saturday.

“Initial reports indicate that the outage was caused by a fault that occurred on the Suswa-Loyangalani high-voltage power transmission line,” Kenya Power said in a statement.

The power supply was restored to parts of Eldoret, Kisumu, and Nakuru, the distributor said. Electricity had also returned to at least one part of the capital Nairobi, according to a Reuters journalist.

Kenya Power is the country’s sole electricity distributor and the bulk of its power comes from Kenya Electricity Generating Company (KenGen), which is the main producer.