The government said it would hand over data on the number of birds found dead at all wind projects in the US.
However PacifiCorp said it only submitted the data on the condition it would remain confidential. As such, the company has filed a law suit at the Utah district court to secure an injunction against the information release.
PacifiCorp said if the government reveals the information, open communication between companies and the government would be restricted.
The US Fish and Wildlife Service collects figures from project operators on the number of carcasses found at their wind projects. But this is only a voluntary measure under permits granted to the developments.
The move to hand over the information comes in response to a freedom of information request from the Associated Press as part of its wider investigation into bird deaths at wind farms.