The Land and Environment Court has upheld an appeal against a $150 million wind farm at Glen Innes.
But details of the ruling would not be made public because the parties have signed a non-disclosure agreement.
The Glen Innes Landscape Guardians brought the legal proceedings against the then minister for planning, Kristina Keneally, who approved the project last October.
The joint-venture, between NP Power and Infigen, plans to build 27 wind turbines on the Waterloo Range, west of Glen Innes.
The parties entered mediation and consent orders were subsequently issued by Commissioner Moore, who handed down an oral judgement on site with conditions attached.
A Court spokeswoman says both parties are required to abide by Commissioner Moore’s orders and the matter is finalised.
Infigen declined to comment and NP Power did not return the ABC’s calls.
A spokesman for the Planning Minister said a response would be provided in due course.