|Status of Power System Transformation 2018
Across the world, change is accelerating in power systems driven by the advent of low-cost, abundant wind and solar energy, the rise of distributed energy resources and increasing digitalization. These factors are leading to a structural shift in the way power systems are best planned and operated. In particular, they call for increased flexibility of power systems. Power system flexibility encompasses all relevant characteristics of a power system that facilitates the reliable and cost-effective management of variability and uncertainty in both supply and demand. A lack of system flexibility can reduce the resilience of power systems, or lead to the loss of substantial amounts of clean electricity through curtailment of VRE.