The manufacturer announced earlier in November that it is to add "hundreds" of manufacturing jobs at its three Colorado factories in the first half of next year despite plans to cut its global staff count to 16,000.
But it has now emerged that the workers will be taken on under three-month contracts.
Some of the employees are expected to be transferred to permanent positions, but the company was unable to say how many. Others will remain on temporary contracts to allow the manufacturer to respond to the market.
A company spokesperson said: "Market conditions have been taken into account with these hires, but this is not exclusively related to the expiry of the PTC. We are doing what we always said we wanted to do, create a more flexible, scaleable organisation."
Jobs will be added at its Windsor blade factory and the blade and nacelle factories in Brighton. Vestas cut around 500 employees in Colorado in 2012 as it adjusted to a downturn in the US market.
There has been a spike in turbine orders in the US as developers rush to reach the spending threshold that will see them qualify for the tax credit before the end-of-year deadline. There are fears this could drop off significantly if the policy is not extended.
There are also concerns that the new hires will mean that Vestas would have to make deeper cuts as it looks to reach its 16,000-employee target. Although it is unclear how the temporary nature of these positions will affect this process.
A small number of employees will be taken on before the end of the year, with the bulk of the intake arriving in the first three quarters of 2014.