The unspoilt beauty of the Lake District could be at risk if plans for a wind farm go ahead, it is claimed.
The wind farm will be the largest seen in Cumbria
Cumbria Tourist Board officials claim building 27 turbines at Whinash, stretching 7km to the Yorkshire Dales, would create a "dangerous precedent."
Its 2,000 members have formally agreed to object to the plans when the controversial move is debated at a public inquiry in April this year.
Members believe the area's landscape would be spoilt by huge turbine blades.
Renewable Development Company and West Coast Energy want to build the turbines, each almost 400ft high, to generate enough power for 46,000 homes.
Eric Robson, chairman of Cumbria Tourist Board, said: "The application would see turbines - each higher than St Paul's Cathedral - go up on a narrow strip of land between two national parks.
"We are not opposed to renewable energy in principle, but we feel the farm would be visible from the M6 motorway which is the gateway to the Lake District and could harm tourism - the county's biggest industry.
"Tourism is worth a billion pounds to Cumbria every year, yet the view would be dominated by the constant movement of turbine blades."
The £55m plan would involve turbines being spread between Tebay and Shap overlooking the M6, and would generate 57 megawatts of electricity.
Renewable Development Company and West Coast Energy have said they have consulted a number of environmental groups in the run-up to submitting plans.
Because of the size of the project the Department for Trade and Industry (DTI) will be responsible for planning consent.