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To address the potential generation deficit, MISO is currently evaluating 42.8 GW of generation active in the MISO-Central generation queue. Additional transmission projects will be necessary to allow interconnection to the BES, to relieve constraints and increase transfer capability between MISO-Central and MISO-South. The SERC MISO-Central assessment area is summer peaking, with a forecast total internal demand of 18,792 MW in 2020. The total internal demand for summer exceeds the total internal demand for winter by approximately 3,000 MW. The net internal demand for summer is expected to remain relatively flat, increasing by approximately .18 percent over the 10-year planning horizon. Reported demand-side management response in the SERC MISO- Central subregion exceeds 1,000 MW, or 5.4 percent of the Total Internal Demand for 2020. This level of demand response is expected to continue through the forecast period. At this time, no significant photovoltaic (PV) developments have been connected to either the transmission or distribution systems in the SERC MISO-Central subregion. Connections of large Distributed Energy Resources (DERs) in the subregion have been limited to wind farms. Interest in DERs is continuing but to date, DERs have not caused a substantial change to the net internal demand in the subregion. Both transmission and distribution planning engineers in many areas of the subregion are experiencing increased interest from customers regarding possible connection of PV and inverter-based resources. SERC MISO-Central does not expect to add any new baseline generation over the 10-year planning horizon. Additionally, SERC MISO-Central is planning to retire approximately 700 MW of coal and gas generators. Coal supplies about 1/2 of the capacity in SERC MISO- Central in 2020. Natural gas and nuclear provide 27 percent and 11 percent of SERC MISO-Central’s capacity, respectively. Hydro and pumped storage provide an additional 2 percent and 2.2 percent, respectively, for summer peak. Approximately 950 miles of new transmission lines in the SERC MISO-Central assessment area are in the design/construction phase. These lines are projected to enhance system reliability and to provide additional capacity and enhance local area voltages. Of the 950 miles of new transmission lines, the vast majority (822 miles) will be
State of Reliability of SERC MISO-Central MISO is one Balancing Authority (BA); however, to better evaluate the reliability, SERC breaks the MISO footprint into MISO-Central and MISO-South. Considering anticipated generation resources strictly within the SERC MISO-Central subregion, the forecasted planning Anticipated Reserve Margin is below the reserve margin benchmark of 15 percent. The Anticipated Reserve Margin is considerably lower than reported in last year’s annual assessment. The forecasted reserve margins are expected to decline further starting in 2023. However, resources would exceed net internal demand by at least 15.07 percent through 2022 considering prospective generation retirements and additions. The SERC MISO-Central subregion also has access to additional firm deliverable resources within the MISO footprint up to the Regional Directional Transfer Limit of 1,000 MW.
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