Viking Energy, a joint venture between Shetland Islands Council and Scottish and Southern Energy, announced last week that it is preparing an addendum to the environmental statement lodged in May. It does not now expect a revised application to be ready for submission to the council until early next year.
Project co-ordinator Allan Wishart said: "A range of views have been expressed about the wind farm proposal since the application was submitted and it is important that they are all considered carefully. That study and any necessary changes to the application will take some time."
The £800 million project would cover nearly 4,050ha of moor and peat bog. In operation, it is expected to contribute £23 million a year to the islands' charitable trust, but a petition containing 3,400 signatures opposing the industrial scale of the development has been submitted to the authority.