RENEWABLE Energy Systems? (RES) imminent planning application for a wind turbine power station in the Den Brook Valley between Bow and North Tawton, is reported to have a major revision over previously disclosed plans in terms of significantly increased turbine height. RES spokesperson Caroline Evans is quoted as saying (Crediton Courier, October 8) ?the height of the towers had been increased (to 80m) because of trees in the area, which would cause turbulence if the towers were 60m high?. However, one can also draw alternative conclusions. So long as RES steadfastly refuse to disclose their wind speed data for the Den Brook site, because of concerns over commercial sensitivity and misinterpretation, there will be speculation that RES have chosen a wholly inappropriate site lacking one of the key elements for a wind farm ? sufficient reliable wind! The tree heights in the Den Brook Valley will surely be well known to RES and would not have grown another 20m during the project planning. Higher turbines find more wind, but at what sacrifice ? nine massive turbine structures now proposed alongside the natural beauty and grandeur of Dartmoor, dwarfing all other elements of the landscape, each with a blade tip height of Salisbury Cathedral ? difficult to equate to the ?low impact? project proclaimed by RES. K E Whitaker Spreyton