DER Planning and Modeling In 2018 and 2019, MISO worked with its Load-Serving Entities (LSE) to reform the MISO Transmission Expansion Plan (MTEP) energy planning load forecasting process. As a result of these reforms, MISO now asks load-serving entities to provide gross monthly demand and energy forecasts for 20 years, and stand-alone projections of energy efficiency, demand response, electric vehicles, DERs and behindthe-meter storage. This will give MISO some visibility, for the first time, into the impact of these assets on planning and modeling. MISO will supplement industry data with assistance of external consultants. An increase in DER penetration requires updates to the planning and modeling processes at MISO as well as member utilities. MISO is committed to engaging with stakeholders in these efforts. Robust transmission planning starts with accurate system modeling. For the MISO Planning 2020 Model Series, MISO will encourage members to begin to identify electrical buses where current or forecasted DER penetration represents a significant portion of their net loads. Because it can be difficult for MISO members to distinguish between gross load and DER negative load at any given electrical bus, MISO proposes to create a new Business Practice Manual to help its members with this task. The continued growth of DERs creates planning complexities. MISO identified an initial set of questions to investigate collaboratively with stakeholders. • How will MISO model DERs in economic and reliability planning assessments, including thermal and voltage transmission limits? • What steps might DER interconnection and retirement processes include, and what level of information is needed about the types of DERs and gross/net load patterns at the transmissiondistribution interface? • How will DERs behave in abnormal conditions and what are the system impacts? The challenges and opportunities of increasing levels of DERs require MISO to have better visibility of the existing and future DERs within the footprint. MISO seeks to enhance the planning process by increasing the visibility into long-term energy and demand forecasts and demand-side management programs. MISO expects the improved energy and demand forecasts, including the DER forecasts, to provide foresight into reliability risks and help MISO plan for appropriate risk mitigation, as well as avoid value erosion. 6
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