As we have seen, integrating more large-capacity 
RE into the grid brings variability and uncertainty.The new solutions will include new 
technologies, methods and practices, applied in 
order to provide more flexibility and improve the 
efficiency of power systems, constantly balancing 
generation and load.At the same time, there will continue to be 
unexpected disturbances stemming from load 
variation, grid faults and conventional generation 
outages.Worldwide studies and experience
in recent years have shown that new technical 
solutions are needed to address this conjunction
of difficulties.The required power system flexibility can be 
achieved on the generation side, from both RE 
generation and conventional generation.Only this will make the power 
systems reliable and maintain security of supply,
i.e. avoid any interruption in the supply of power.