A protest is taking place in Llandrindod Wells on Thursday, November 1, after a Welsh Government minister overturned decisions made by Powys County Council to allow Hendy Wind Farm to be built.
The campaigners behind the protest, which will take place outside the Metropole Hotel from 8.30am, say the decision made by Lesley Griffith AM "overturns local democracy."
Jane McDonnell, the organiser behind the protest, said: "This cannot be allowed to happen. It's not only about it being a beautiful area, it's about undermining local people."
The protest is taking place at the Llandrindod Wells hotel as the Cabinet Secretary for Energy, Planning and Rural Affairs will be speaking at a National Farmers Union conference there.
Ms McDonnell said this is a "golden opportunity to show her we will not have our voices ignored."
"That's why we're having to do it in such a rush," she said.
The Powys Planning Committee and a planning inspector had previously decided against the building of the seven wind turbines.
The turbines will be located between Penybont and Llandegley and they could rise to be 110m high.
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