The four-lane dual carriageway is now 99% complete.
Atomic Energy Agency says country is ready for nuclear power.
Olkaria 1 Unit 6 will inject 83MW into the national grid.
The 27km elevated highway was built at a cost of Sh88 billion.
On completion, it will be the third highest bridge in Africa.
The project has been delayed by land compensation disputes.
The project has a contract sum of $163m (Sh18.7 billion).
The project is co-funded by the Japan Int. Cooperation Agency.
The project is on schedule for final completion this year.
The plant, also known as Alten Solar Power Station, has a 40MW installed capacity.