EVALUATION OF RELIABILITY REQUIREMENTS AND METRICS As part of MISO's assessment of risk and opportunities in a transforming portfolio, MISO is evaluating how to analyze and identify appropriate future reliability requirements and metrics to meet MISO's needs - Availability, Flexibility, and Visibility. This evaluation should shed light for planning purposes on the type and quantity of specific capabilities needed from resources across all hours of the year. As an example, this evaluation of capabilities would not only address generic flexibility related services such as ramping, but it would also address how much and what type of ramping the system needs across various time horizons (immediate, within an hour, within the day and across days). Ramping is one example of a capability needed to operate the system reliably in a portfolio where at least 40 percent of the generation comes from renewables. MISO’s studies - Renewable Integration Impact Assessment (RIIA) and Portfolio Evolution Study simulations - give an indication of these needs and show the magnitude of extreme ramps will grow. Additionally, the RIIA study shows frequency regulation, system stability and local voltage support will become more challenging with increasing renewable penetration. MISO’s existing planning mechanisms, markets and operational processes are sufficient to address these needs at the region’s current penetration of renewables. However, all of these tools will need to be reevaluated and potentially revised as renewables continue to grow in the region. These assessments and related engagement with stakeholders are of the highest priority while MISO also continues to advance other directionally aligned enhancements that are more near-term in nature. Next Steps • Work with stakeholders to evaluate the effectiveness of current reliability requirements and metrics to address risk and opportunities within a transforming portfolio • Based on findings and input from stakeholders, recommend changes to reliability requirements and metrics to assess needs across all hours LOAD-MODIFYING RESOURCES PERFORMANCE REQUIREMENTS In each of the past three Planning Reserve Auction years, LMRs comprise a higher percentage of MISO resources. The region is increasingly experiencing tight operating conditions that MISO must address by deploying all types of resources — including LMRs that currently can only be called into service during emergencies. This increasing reliance on and use of LMRs, now and in the future, begs the question as to whether LMRs should continue to be treated differently from traditional generation. 10
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