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Loads play an important role on this analysis. Nonetheless, as you may have modelled them as constant P,Q, the PV analysis will proceed with incremental power changes (load or generation) in the area that you will have determined in the dfax files (thereby stressing the system towards a specific determined direction) until the point of no further solution, due to load flow equations limits. What jconto mentions is correct. You have to select to save all the incremental load flow cases in the PV analysis and retrieve the sav file just before the collapse. This corresponds to the limiting case (nose curve point). If you want to go further (down the nose curve) you will have to change the modelling of the loads, i.e. proceed with a relaxation of constant current or constant impedance load modelling. Nonetheless, these operating points do not correspond to more active power consumption, but rather to unstable operating points.