The line will connect geothermal power plants to its western region, and also enable importing power from neighboring countries.
Construction on the 400kV line in Olkaria-Lessos-Kisumu electricity transmission project will begin in April, reported Capital FM.
The line will supply geothermal energy from Olkaria in Naivasha to western Kenya.
State-owned Kenya Electricity Transmission (Ketraco) said in a statement: "This project will also serve as the backbone for regional power interconnection among the countries in the region."
Being funded by the government and the Japan International Corporation Agency, the contracts were awarded for firms based in Japan, India and China.
Lot 1 has been awarded to a joint venture of Kalpataru Power Transmission of India and Kinden Corporation of Japan.
NARI Group and China Construction Civil Engineering Consortium has won the Lot 2 contract and Sieyuan Electric Lot 3.
New transmission lines will be laid from dam projects in Ethiopia, in addition to Rwanda, Tanzania and Uganda, reported Reuters.
Ketraco managing director Joel Kiilu said: "These projects will see the country’s grid stabilize as the dream of regional power trade becomes a reality when Kenya and Rwanda receive 400MW and 200MW respectively in 2017 from Ethiopia."
