The project is being developed by a Vattenfall-led consortium in Aberdeen Bay to test next generation offshore wind turbines.
It is already under fire from celebrity entrepreneur Donald Trump, who is building a golf course and hotel complex nearby.
According to the BBC, RSPB Scotland area manager for north-east Scotland Ian Francis said more research into the project’s impact was needed. The RSPB maintain there are a number of rare birds in the area.
Francis said: "More planning, research and monitoring is needed to ensure we truly understand the impact this site may have on local birds.
"The bay is an important area of many species. Since this is a European funded test centre, it is crucial that a thorough research programme is developed to help understand how this and the many forthcoming offshore wind farms can reduce their impacts on birds and other marine wildlife."
The RSPB did not respond to Windpower Monthly’s calls when asked to comment on the story.
Any delays to the wind farm are likely to be welcomed by Trump’s organisation. In September, Trump described the project as "environmentally irresponsible".
Update - 4 November
The RSPB has said it has been in contact with Vattenfall and that the energy company is in the process of providing the data needed to make a decision. An RSPB spokesman said it "hoped it would be able to drop its objection".