DRIVER ③ GROWTH IN DEMAND SIDE AND OTHER EMERGENCY-ONLY CAPACITY LSEs committed more than 11 GW of LMR (demand response and behind-the-meter generation) cleared in the PRA in 2019. This was 9 percent of the summer peak load forecast. These 11 GW of resources are not available to MISO’s operators without the declaration of a MaxGen emergency under the existing framework. Overall, LMR performance has fallen short of its performance requirements during emergencies. Additionally, LMRs can have notification times up to 12 hours and can have limited or no availability outside of summer. However, based on FERCs approval of the RAN Phase 1 filing relating to LMR performance and generator outages, these resources are now required to offer their true availability and shortest notice time throughout the year. LMRs also must demonstrate their ability to curtail load on an annual basis. DRIVER ④ GROWING RELIANCE ON UNSCHEDULED RESOURCES MISO now relies more heavily upon uncertain or otherwise non-committed supply resources. In the last few years MISO has become a significant importer of energy from neighboring systems. About half of this energy is scheduled in real time with submission of interchange due just 20 minutes prior to each 15-minute interval. While MISO has arrangements in place for the purchase of emergency energy from neighboring systems during declared emergency conditions (as occurred in January 2018), availability of such energy remains highly uncertain. While the regions have successfully managed these issues to date, there could be increased risk to reliability if steps are not taken to address the changing future portfolio. DRIVER ⑤ GROWTH OF VARIABLE ENERGY RESOURCES Variable energy resources (e.g. wind and solar generation), an increasingly important resource category, has different operational characteristics than legacy thermal resources. Renewable resources are accredited based on historic contribution during past system peaks, but there is no assurance that the accredited capacity will be available during a particular emergency event. If wind or solar happen to contribute less during a particular time of need than in prior instances, the difference must be made up elsewhere. These resources, at times, will likely help conditions by producing more than accredited, so it is important to understand and plan for the operational implications of future growth of renewables . 8
12 Publizr Home