Abstract: With the proposed goal of achieving double carbon in China，a higher proportion of new energy will

be connected to the grid in the future. An analysis method was proposed for assessing the adequacy of flexibility

resources of power system with a high proportion new energy. The adequacy index of proposed flexibility resource

can be used to assess the relationship between flexibility capacity demand and operational reserve demand based on the characteristics of the cycle curve of net load variation. The proposed cycle curve model can represent the

probability of occurrence of the amount and rate of change of net load. Thus the adequacy of flexibility resources can be evaluated in addition to the adequacy of power systems containing a high proportion of new energy. Finally，the metrics of the proposed method were validated by simulating a typical power supply and demand balance scenario.

      Key words: new energy ；uncertainty ；adequacy of flexible resource ；power supply and demand balance