Effective approaches 1 Electric load flow 1 Electric power transmission networks 1 Gaussian distribution 1 Multivariate piece-wise linear approximation 1 Photovoltaics 1 Piecewise linear 1 Piecewise linear approximations 1 Power distribution grids 1 Power grids 1 Probabilistic analysis 1 Probabilistic load flow 1 Sensitivity analysis 1 Uncertainty 1 multivariate piece-wise linear approximation photovoltaic 1 power distribution grid 1 probabilistic load flow 1 sensitivity analysis 1