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How does Dominion Energy account for congestion when applying a 20% limit on energy imports from PJM in the IRP?
In the 2025 IRP Update, the Company applied a modeling assumption that limited annual energy purchases from PJM to 20% of total energy requirements. Congestion costs were not included within the 20% limitation itself. Instead, congestion is reflected through other model inputs, including market price assumptions. The model also includes separate hourly limitations that reflect the physical capability of the transmission system to deliver energy. Together, these inputs help the Company evaluate the role of market purchases while accounting for transmission and congestion considerations.
The 20% annual limit is a planning assumption used within the IRP modeling process and does not represent an operational restriction on energy purchases. As a PJM member, Dominion Energy continues to operate in accordance with PJM market and dispatch rules.