Finally, in all scenarios with an 80% share of renewables, open cycle gas turbines are no longer part of the optimal portfolios as the large pump storage capacity can supply all the fast flexibility needed by the system. However, with increasing penetration of wind and solar plants, the curtailment of variable power plants becomes significant. For instance, with a 35% and 50% share of renewables, the curtailment of electricity generation from wind and PV power plants is negligible and amounts to maximal 0.4% of the possible annual electricity generation.