The project will be undertaken by South African firm Raubeck Construction.
There are about 15 utility-scale solar projects announced in the country with a of 526MW.
Engineers are undertaking soil tests to help inform the final design of the overpass.
The 165.4 MW power plant is expected be commissioned in July next year.
This is part of the Trans-African Highway, which comprises a network of road projects.
Looop will execute the plan, while the county government will provide the land.
Construction of the cable cars system is expected to begin in December.
The 77 kilometre road will be upgraded from gravel to bitumen standard.
The much-awaited 2km-viaduct still remains a project without a launch date.
The Chinese are using the hanging basket technique to tackle challenges.
Talks are underway for China to fund a new highway and rail extension.
The Chinese-funded Orpower 22 power plant will take 17 months to complete.
Bedsitters will rent for Sh3,200 per month on a 30-year rent-to-own plan.