Free Writing Prospectus (Form FWP)

Filed Pursuant to Rule 433

to Prospectus dated May 11, 2023

Registration Statement No. 333-271838

Article Posted to Company Intranet regarding Dominion Energy Reliability Investment, March 5, 2026

DERI: Another Smart Way to Invest in Dominion Energy

Dominion Energy Reliability Investment (DERI) is an investment product backed by Dominion Energy. Under this program, Dominion Energy borrows directly from investors and, in return, they receive a competitive floating interest rate and easy access to their money.

Benefits of investing in DERI include 3.75% rate of return¹, no maintenance fees, easy online access, and automatic savings tools. Dominion Energy employees have 10 months to reach the $1,000 investment minimum.

Since the program's inception in 2018, over 275 employees have created an account and benefited from competitive variable rates. DERI's total balance has grown to approximately $425 million as of February 1, 2026, and investment is open to Dominion Energy employees, retirees, stockholders, customers, and the public (must be a citizen of the United States).

3.75% for all investment balances

How do I create a DERI account? Three ways to apply:

Dominion Energy Reliability Investment

P.O. Box 75713

Chicago, IL 60675-5713

For additional information visit the DERI website, reach out to [email protected], or call 866-876-0001.

Dominion Energy, Inc. has filed a registration statement (including a prospectus) with the United States Securities and Exchange Commission (SEC) for the offering to which this communication relates. Before you invest, you should read the prospectus that is included in that registration statement, as well as the other documents that Dominion Energy, Inc. has filed with the SEC, for more complete information about Dominion Energy, Inc. and this offering. You may get these documents for free by visiting the SEC website at www.sec.gov or the DERI website at investors.dominionenergy.com/fixed-income/dominion-energy-reliability-investment/. Alternatively, Dominion Energy, Inc. will arrange to send you a prospectus if you request it by calling toll free at 866-876-0001.