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energy resources and some natural gas. Additionally, SERC Southeast is planning on minimal retirements: 12 MW of gas generators. Coal supplies about 1/3 of the capacity in SERC Southeast in 2020. Natural gas and nuclear provide 39 percent and 17 percent of SERC Southeast’s capacity, respectively. Hydro and pumped storage provide 7 percent and 4 percent, respectively, for summer peak. SERC Southeast entities coordinate transmission expansion plans in the Region annually through joint model-building efforts that include the plans of all SERC entities. The coordination of transmission expansion plans with entities outside the SERC Region is achieved through annual participation in joint modeling efforts with the Eastern Interconnection Reliability Assessment Group (ERAG) Multi-regional Modeling Working Group (MMWG). SERC Southeast entities are expecting approximately 418 miles of new transmission additions over the assessment period that are in the design/construction phase, and are projected to enhance system reliability by supporting voltage and relieving challenging flows. Other projects include adding new transformers, reconductoring existing transmission lines, and other system reconfigurations/additions to support transmission system reliability. Entities in SERC Southeast do not anticipate any transmission limitations/constraints that would impact reliability or generation shortfalls throughout the planning horizon.
State of Reliability of SERC Southeast Anticipated Reserve Margins for the SERC Southeast are expected to remain above the Reference Reserve Margin for the next 10 years. The Anticipated Reserve Margin is 34.23 percent in the summer of 2020 and grows to 44.65 percent by 2029. Entities in the assessment area also have policies in place to maintain at least a 15 percent reserve margin. Some entities have begun the process of implementing separate winter reserve margins. The net internal demand for summer is expected to remain relatively flat, decreasing slightly by approximately .1 percent over the 10-year planning horizon. Distributed Energy Resources (DERs) in this Assessment Area are small (~400 MW), but are expected to grow over the period to ~500 MW. Entities account for distributed generation and behind-the-meter generation by modeling the net of the load and generation. A distributed or behind-the-meter generation facility will be shown explicitly only if an agreement is in place for that generation to be utilized (i.e., controlled) by a Balancing Authority in SERC Southeast. Although entities in SERC Southeast continue to monitor and engage in committee forums related to the issue, entities are not anticipating operational impacts due to these resources. SERC Southeast expects to add approximate 11,598 MW of new generation over the 10-year planning horizon, predominantly variable
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