Approval has been granted for Australia's biggest solar farm with developers hoping to begin construction in 2016 for the estimated $1 billion project.

The solar panel farm would be built west of Toowoomba at a 200-hectare site at Bulli Creek, which sits between Millmerran and Goondiwindi.

An artist impression of a $1 billion solar farm Solar Choice plans to build in the Darling Downs.

The Toowoomba Regional Council granted rezoning of the land under a number of conditions, including that construction of the first stage of the project begins within four years. The solar farm will also have a 35-year operating limit from when it begins operations.

Developer Solar Choice says by the time the entire farm is complete in eight to 10 years it will be able to generate 2 gigawatts of electricity, which is enough to power 550,000 homes.