There are some environmental regulations that apply to wind farms.  Any construction activity that disturbs more than 1 acre of total land including staging areas and offsite disturbance must obtain a stormwater construction permit.  The application and forms for this can be found on NDEQ’s website at www.deq.state.ne.us.  Follow this path:  Publications & Forms –> Water Quality –> NPDES Permit for Storm Water Discharges from Construction Sites (under Applications and Forms header).

If your project requires a concrete plant to be temporarily or permanently placed at the site, an air permit may be required depending on the potential emissions of the plant.  An air permit may also be required if there are any concrete, asphalt, or similar type of crushing activities.  To find out if you need any type of air permit, please call the Air Permit Assistance Hotline at 1-877-834-0474.

The above permits are the most common that may apply to a wind farm project.  Depending on the specific aspects of your project, there may be other environmental regulations that apply. 
Nebraska Department of Environmental Quality
1200 "N" Street, Suite 400
PO Box 98922
Lincoln, Nebraska 68509
402 471-2186
Fax 471-2909

Other governmental agencies that may be involved in your wind farm project would be the Nebraska Game and Parks Commission with regard to threatened and endangered species and the US Army Corps of Engineers with regard to the disturbance of a wetland.  To find out if your project complies with the Nebraska Nongame and Endangered Species Conservation Act, contact the Commission at 402-471-5438.  If your project will disturb a wetland, contact the Corps at 402-995-2417.

Permits for wind towers are handled by the Nebraska Department of Aeronautics and require a Federal Aviation Administration (FAA) “Notice of Proposed Construction or Alteration.” A permit, Form HP1, is required from the Nebraska Department of Aeronautics before erecting/building any structure exceeding a height of 150 feet above the surface of the ground at the point of installation, unless erected under the authority of a license or permit issued by a federal agency. A determination of "no hazard" from the FAA in response to the filing of a 7460-1 is not a "license or permit."
Ronnie Mitchell, Director
Nebraska Department of Aeronautics
3431 Aviation Rd, Suite 150
Lincoln, NE 68524
402-471-2371

Permits for connecting to the electric grid from the Power Review Board:
Tim Texel
Power Review Board
PO Box 94713
Lincoln, NE 68509
402-471-2301