Numerous studies have shown that a system consisting of intermittent renewable energy resources and short-duration storage (i.e. 4 and 8-hour capacity duration) that cycle daily can economically meet demand in most hours across a year. However, due to the seasonal mismatch in electricity demand and weather dependent production from wind and solar resources, there remains a significant amount of energy that must be shifted from the low net load intervals of the spring and fall seasons to the peak load times during the summer and winter months. Advances in technological, economic, and modelling approaches are needed to better quantify and characterise the seasonal energy gap that remains to be served after the coordinated economic dispatch of renewables and storage resources.
The NYISO seeks to improve the representation of this fleet segment in each of its successive studies, while understanding that characterization of emerging technology implementation pathways can introduce its own uncertainty into the model. The NYISO continues to recognize that there is a need for supply beyond renewables and storage resources that can provide dependability supply during the summer and winter peak periods and when the output of renewable resources is low. The Outlook “Appendix F: Dispatchable Emission-Free Resources” by the New York ISO has incorporated the DEFR concept into its evaluation of the Policy Case for further consideration.
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