Spanish giant FCC has taken the main contract to transform 830 acres of Blaenau Gwent into an international motorsport circuit, technology park and training facility.
Local firm Alun Griffiths will deliver the ground reprofiling and infrastructure package on the project.
Scheme promoter, the Heads of the Valleys Development Company, received final planning in November and is now aiming to start construction proper by March.
The project will bring an international motorsport circuit to the site north of Ebbw Vale, near the Rassau Industrial Estate, alongside a 1m sq ft technology park and training facility.
Backers hope to have the track completed for the circuit to stage the British MotoGP in 2017, before the entire development is completed in 2020.