Prospectus Filed Pursuant to Rule 424(b)(3) (424b3)

Registration No. 333-249758

Filed Pursuant to Rule 424(b)(3)

DOMINION ENERGY, INC.

DOMINION ENERGY RELIABILITY INVESTMENT^(SM)

VARIABLE DENOMINATION FLOATING RATE DEMAND NOTES

PRICING SUPPLEMENT

(To Prospectus dated October 30, 2020)

The Date of this Pricing Supplement is August 9, 2021

The Dominion Energy Reliability Investment Variable Denomination Floating Rate Demand Notes (the “Notes”) bear interest at a floating rate per annum determined by the Dominion Energy Reliability Investment Committee on a weekly basis to be effective on Monday of the week following such determination. Under the terms of the Dominion Energy Reliability Investment program, the interest rate payable on the Notes may vary based on the principal amount of the Notes that an investor owns.

The current Prospectus for the Notes was filed with the Securities and Exchange Commission on October 30, 2020. The interest rates established for the Notes as of August 9, 2021 and set forth below remain in effect until further notice.