The Hallett Wind Farm development is Wind Prospect's sixth wind farm development in South Australia. It consists of 160 wind turbine generators in the general farming zone of South Australia's Mid North region, together with an underground electrical cable network, access tracks, crane hardstandings and several wind monitoring masts.

On 22 November 2004, the Northern Areas Council and Regional Council of Goyder carried motions to grant Provisional Development Plan Consent for 130 of the then proposed turbines. These turbines are part of the Brown Hill Range Wind Farm, The Bluff Range Wind Farm, Willogoleche Hill Wind Farm and Hallett Hill Wind Farm.

The wind farm was made known to the local community by way of newsletters, press releases and a public exhibition held by Wind Prospect at the Hallett Hall in Hallett, on Friday 17th October, 2003. From there, a planning application was submitted to the Regional Council of Goyder and Northern Areas Council, with decisions made on the individual clusters in November 2004.