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 seeks to promote the use of rail transport over vehicles.
The law allows for the issuance of apartment title deeds.