Study Procedure and Results:
Each SERC study representative performed an area-wide assessment in order to determine if their SERC Balancing Authority area contained enough remaining resources to serve their load obligations. The study also evaluated the strength of the SERC interconnected network by performing steady-state contingency analysis and identifying transmission constraints.
|High Level Study Results |
|SERC Subregions ||Retirements compared to Total case generation online ||Proxy Generation utilization ||Importing Power ||Limiting Facilities |
|Central ||5%-10% ||1 Member ||1 Member ||4 Members |
|Delta ||10%-15% || ||1 Member ||1 Member |
|Gateway ||25%-30% ||1 Member ||1 Member ||1 Member |
|Southeastern ||10%-15% || || ||1 Member |
|VACAR ||5%-10% ||2 Members || ||2 Members |
The study results highlighted several potential transmission reliability concerns and area-wide resource deficiency concerns. Four areas utilized replacement proxy generation to compensate for generation deficiencies and three areas imported power from neighboring companies to make up for their deficiencies. All subregions experienced transmission constraints that impacted the reliable operation of the BPS. For more information on the study, please follow the link to the public report.
Assessing The Renewable Generation Impact
In parallel with the SERC LTSG effort, members of the SERC Resource Adequacy Working Group (RAWG) analyzed the impact of replacing coal generation with renewable energy (VERs). The group’s analysis found that replacing coal generation with renewables requires higher reserve margins to ensure reliability, due to the variable nature of renewable resources. In addition, the resource adequacy risk shifts from the summer peak to other seasons.