Calculation of nodal and zonal coefficients to incorporate in the Portuguese tariffs for use of the transmission network

Abstract

In this paper we describe the studies and the main results obtained with a consultancy study conducted to evaluate nodal and zonal coefficients to incorporate in the Portuguese tariffs for the use of the transmission system. According to the Tariff Regulation these coefficients should signal good or bad connection points and should mainly reflect transmission losses. To compute them, we analyzed several generation/load scenarios of the system, computed the components of nodal marginal prices and performed classification studies in order to define zonal coefficients in the 400 kV, 220 kV, 150 kV and 60 kV connection points with the distribution grids.