11 Renewable Resource

Renewable Generation Curtailment

Figure 85 shows the monthly wind and solar VERs (variable energy resource) curtailment due to system wide condition or local congestion in RTD. Figure 86 shows the monthly wind and solar VERs (variable energy resource) curtailment by resource type respectively in RTD. The curtailment increased in February.

Economic curtailment is defined as the resource’s dispatch upper limit minus its RTD schedule when the resource has an economic bid. Dispatch upper limit is the maximum level the resource can be dispatched to when various factors are take into account such as economic bid, generation outage, ramping capacity, and etc. Self-schedule curtailment is defined as the resource’s self-schedule minus its RTD schedule when RTD schedule is smaller than self-schedule. When a VER resource is exceptionally dispatched, then exceptional dispatch curtailment is defined as the dispatch upper limit minus the exceptional dispatch value.

Figure 85: Renewable Curtailment by Reason

Figure 86: Renewable Curtailment by Resource Type