D Dominion Energy Inc

Filed pursuant to Rule 433

Relating to Preliminary Prospectus Supplement dated September 10, 2020

to Prospectus dated June 26, 2020

Registration No. 333-239467

The issuer has filed a registration statement (including a prospectus) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the SEC, including the preliminary prospectus supplement dated September 10, 2020, for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the prospectus and preliminary prospectus supplement if you request them by calling:

* A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time.

** We expect that delivery of the Senior Notes will be made against payment for the Senior Notes on the settlement date, which will be the fifth business day following the date of this final term sheet (this settlement cycle being referred to as “T+5”). Under Rule 15c6-1 of the SEC under the Exchange Act, trades in the secondary market generally are required to settle in two business days, unless the parties to that trade expressly agree otherwise. Accordingly, purchasers who wish to trade Senior Notes on the date of this final term sheet or the next succeeding two business days will be required, by virtue of the fact that the Senior Notes initially will settle in T+5, to specify an alternate settlement cycle at the time of any such trade to prevent a failed settlement and should consult their own advisers.

*** It is highly likely that a Benchmark Transition Event and related Benchmark Replacement Date (each as defined in the preliminary prospectus supplement) will occur with respect to the Three-Month LIBOR Rate. In that event, interest on the Senior Notes will be determined not be reference to the Three-Month LIBOR Rate but instead by reference to a Benchmark Replacement (as defined in the preliminary prospectus supplement). See DESCRIPTION OF THE SENIOR NOTES—Interest—Effect of a Benchmark Transition Event and RISK FACTORS—Risks Relating to the Senior Notes in the preliminary prospectus supplement for more information.