The licensed site for the windfarm is 76-sq-mile (200-sq-km), but the development may not necessarily cover the whole area, Mike Unsworth, Navitus Bay project manager, said.
The Stonewall Hill Conservation Group has been fighting the Reeves Hill windfarm and hopes the Welsh government's decision over the access road to the site will help stop it being built.
They argue that the BLM had violated the federal Endangered Species Act and other environmental laws by failing to adequately consider the impact of the windfarm on condors, golden eagles and other protected wildlife when it leased the project site to NextEra, the Florida-based energy developer.