Energy CS Davis Chirchir has said the nationwide blackout was caused by an overload in the Kisumu- Muhorono line.
The CS noted that the overload forced the system to shut down.
The line is planned to carry 80MW but was carrying 149MW as of the time of the blackout.
"We have not invested much in the networks. We plan on giving out a number of networks to be built by private firms. This will ease putting pressure," he said.
He noted that a new substation and a line of 90 km will relieve the capacity on the Muhoroni - Kisumu line.
"We will build a new 33KV line between Narok and Bomet to prevent constant power outages. We will have reduced overload line to prevent plunging the country into darkness," he said.
"The new line will take 20 months to complete. It will be funded by the African Development Bank and Japan."
He said the country has not had any major electricity system upgrades for the past six years.
The power outage that took place on Sunday was experienced from 8 pm.
Kenya Power said the power outage was as a result of a suspected fault affecting the power system.
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