Taralga and Crookwell residents are furious they have been given only two weeks to respond to a proposed modification of a wind farm planned for their village north of Goulburn.

RES Southern Cross want to increase the size of the turbines to be used in the project and have lodged a formal application with the Department of Planning to that effect.

Public comment closes on February 19.

But residents say they were only told about the change on January 31, which meant the Taralga Landscape Guardians, a group of locals opposed to the wind farm, missed their opportunity to make submissions to the Land and Environment Court during last year's appeal against the farm's approval.

The group alleges the Department knew about the proposed modification in November 2007, and deliberately kept those details from them so they could not include it in their legal challenge.

Goulburn MP Pru Goward says it is a clear cut case of planning by stealth.

"This whole exercise has been treated as a joke by the minister (Frank Sartor), which was evident when he drove into Taralga late one evening, had a beer at the local pub and drove out again," she said.

"He considered this to be consulting with the locals."