A review on the Spanish Method of visual impact assessment of wind farms: SPM2

This work offers a review of the so-called Spanish Method for the visual impact assessment of wind farms. The five coefficients originally proposed in the method have been analysed and discussed from several approaches: validity, efficiency, limitations and need of actualisation, among others. As a result, we establish a set of new proposals that update or modify the definition or calculation of these coefficients, but always trying to retain their original meaning. The work is complemented by a short case study in which we compare the values of the coefficients of the original Spanish Method with those arisen from our new proposal. The difference is often relevant, both in the numerical value of the coefficients and in the improvement of their ability to describe the visual effect. Finally, the new formulation of the Spanish Method opens a possibility for the public participation in several moments of the process.