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When will IRP modeling inputs be finalized, and when will stakeholders have access to those inputs or supporting data?

IRP modeling inputs are expected to be finalized mid-summer. Because the 2026 Virginia IRP is an update filing, it is not subject to a formal evidentiary proceeding, and a discovery process is not expected.

Stakeholders have opportunities to engage in modeling inputs throughout the stakeholder engagement process. Modeling Meeting 3 will include discussion of inputs for the Stakeholder Input Case, which will be reflected in the stakeholder survey planned for July.

Other Stakeholder Questions and Answers

• Is the Company modifying any IRP methodology in the upcoming IRP to reflect the merger?
• What is Dominion's assumption for EE/DSM/DR levels? Specifically, is the Company assuming historical performance/savings, increased savings, or decreased savings over time? Regarding DR specifically, is the Company assuming that new large loads have interruptible service or other load-modifying capabilities to shift or reduce usage at peak?