Financial details of the transaction have not been disclosed. The project was the largest onshore wind site to be awarded a contracts for difference (CfD) subsidy at the first auction round in February.
Infinergy said Dorenell is currently permitted as a 177MW site, but due to technological advancements in turbine size, the project has been redesigned to boost capacity to 200MW.
Final consent is yet to be given for the increase in size, the UK developer added, but the local council gave its approval in August.
The plan had been to use 59 3MW turbines at the site, but the redesign would allow 60 3.3MW turbines.
A spokesperson for Infinergy said the company usually looks for financial partners to help build its projects. Following the transaction, EDF will be solely responsible for the construction of the project.
"After almost ten years developing this site and securing planning consent for the existing 177MW project, our focus now is on bringing new technology through the planning process to make Dorenell the best wind farm it can be, maximising output at the site which will make an extremely important contribution to the renewable energy targets set by the Scottish government as part of policy to ensure greater diversity and security of electricity supplies," said Infinergy managing director Esbjorn Wilmar.