There has been considerable discussion on the capabilities of wind and solar plants to provide ancillary services and a call to action for all new resources to have capabilities to support grid reliability. And to great extent, these changes are well underway. The results described here clearly demonstrate that utility-scale PV plants are not only capable of providing essential reliability services that can enhance system flexibility and reliability without incurring carbon emissions but can perform even better than conventional plants. With ever decreasing cost of solar electricity, the opportunity cost associated with some curtailment to provide services like up regulation will reduce as well.
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