The developer of the proposed Grandpa's Knob Windpark in Rutland County has canceled easement agreements with surrounding landowners.

The developer, Reunion Power, sent letters to the towns of Pittsford and West Rutland last week saying it had terminated access agreements with property owners. The two towns are located on the east side of the proposed 20-turbine, 50 megawatt project to span Pittsford Ridge.

It's unclear whether the Grandpa's Knob project will proceed. Reunion Power, which has offices in Manchester Center and New Jersey, did not return calls seeking comment Monday.

Pittsford Town Manager John Haverstock said some of the town's residents worry mountaintop development will harm the area's unique wildlife habitat and natural beauty.

In an April 2012 letter, the Agency of Natural Resources said the "site has exceptional ecological values, and that a commercial wind energy project constructed and operated at this location will result in an undue adverse effect on the natural environment and cannot be mitigated."

Annette Smith, executive director Vermonters for a Clean Environment, a group opposing ridgeline wind projects, said the canceling of the easements means the developer would have to start from scratch to move the project forward.