Annual Report of Employee Stock Purchase/Savings Plan (Form 11-K)

1. DESCRIPTION OF PLAN

The following description of the Dominion Energy Virginia 401(k) Plan for Union-Represented Employees (the Plan) provides only general information. Participants should refer to the Summary Plan Description for a more complete description of the Plan's provisions.

Depending on a participant's hire date, years of service, and the percentage of pre-tax, Roth and after-tax contributions, the Employer contributes a matching amount from 1% up to 7% of the participant's eligible earnings.

Newly hired employees are enrolled automatically into the Plan at a 4% pre-tax contribution rate approximately 45 days after the date of hire, or rehire unless an alternative election is made. Certain rehires are generally auto-enrolled depending on criteria such as, but not limited to, their hire date, enrollment status, and whether they have incurred a break-in-service. This Plan also provides an auto-save feature that automatically increases the contribution percentage each year in 1% increments, up to a maximum percentage unless an alternative election is made.

The loans are interest-bearing at the prime rate of interest plus 1%. The rate is determined at the beginning of each month if a change has occurred in the prime rate. However, the rate is fixed at the inception of the loan for the life of the loan.

Participants make principal and interest payments to the Plan through payroll deductions. Terminated participants may elect to continue repaying their loans, provided they establish a loan repayment schedule with the Plan recordkeeper. Any defaults in loans result in a reclassification of the remaining loan balances as taxable distributions to the participants.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3. PLAN INTEREST IN MASTER TRUST

Certain of the Plan's investments are held in a Master Trust that was established for the Plan and the other employee benefit plan of Dominion Energy and its subsidiaries. Investment income and expenses are allocated to the individual plans based upon average monthly balances invested by each participant.

4. FAIR VALUE MEASUREMENTS

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (exit price) in an orderly transaction between market participants at the measurement date. Fair values are based on assumptions that market participants would use when pricing an asset or liability, including assumptions about risk and the risks inherent in valuation techniques and the inputs to valuations. Fair value measurements assume that the transaction occurs in the principal market for the asset or liability (the market with the most volume and activity for the asset or liability from the perspective of the reporting entity), or in the absence of a principal market, the most advantageous market for the asset or liability (the market in which the reporting entity would be able to maximize the amount received or minimize the amount paid). The Plan applies fair value measurements to the Plan's investments in accordance with the requirements described above.

Inputs and Assumptions

The Plan maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring the fair value of its investments. Fair value is based on actively-quoted market prices, if available. In the absence of actively-quoted market prices, the Plan seeks price information from external sources, including broker quotes. When evaluating pricing information provided by brokers, the Plan considers whether the broker is willing and able to trade at the quoted price, if the broker quotes are based on an active market or an inactive market and the extent to which brokers are utilizing a particular model if pricing is not readily available. If pricing information from external sources is not available, or if the Plan believes that observable pricing is not indicative of fair value, judgment is required to develop the estimates of fair value. In those cases, the Plan must estimate prices based on available historical and near-term future price information and certain statistical methods that reflect market assumptions.

The inputs and assumptions used in measuring fair value for investments include the following:

The Plan regularly evaluates and validates the inputs used to estimate fair value by a number of methods, including review and verification of models, as well as various market price verification procedures such as the use of multiple broker quotes to support the market price of the various investments in which the Plan transacts.

The fair value hierarchy gives the highest priority to quoted prices in active markets (Level 1) and the lowest priority to unobservable data (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. In these cases, the lowest level input that is significant to a fair value measurement in its entirety determines the applicable level in the fair value hierarchy. Assessing the significance of a particular input to the fair value measurement in its entirety requires judgment, considering factors specific to the asset.

Recurring Fair Value Measurements

Fair value measurements are separately disclosed by level within the fair value hierarchy.

Plan Investments

Investments Held in Master Trust

5. FEDERAL INCOME TAX STATUS

The Plan is a qualified employees' profit sharing trust under Section 401(k) of the IRC and, as such, is exempt from federal income taxes under Section 501(a). Pursuant to Section 402(a) of the IRC, a participant is not taxed on the income and pre-tax contributions allocated to the participant's account until such time as the participant or the participant's beneficiaries receive distributions from the Plan.

The Plan obtained its latest determination letter on July 25, 2017, in which the IRS stated that the Plan, as then designed, was in compliance with the applicable requirements of the IRC and therefore, the related trust is exempt from taxation. In December 2016, the IRS began publishing a Required Amendments List (List) for individually designed plans which specifies changes in qualification requirements. The List is published annually and requires plans to be amended for each item on the List, as applicable, to retain its tax exempt status. The Plan has been amended since applying for the determination letter; however, the Plan administrator believes that the Plan and related trust are currently designed, have been amended and are being operated in compliance with the applicable requirements of the IRC. Therefore, no provision for income taxes has been included in the Plan's financial statements.

6. EXEMPT PARTY-IN-INTEREST TRANSACTIONS

The Plan had an interest in the Master Trust and invested in shares of certain common/collective trust funds that were managed by Bank of New York Mellon. During 2025 and 2024, Bank of New York Mellon was the trustee as defined by the Plan and, therefore, these transactions qualify as exempt party-in-interest transactions. Fees paid by the Plan for investment management services were included as a reduction of the return earned on each investment fund.

As of December 31, 2025 and 2024, the Plan's investment in the Dominion Energy Stock Fund included 1,908,481 and 2,023,852 shares, respectively, of common stock of Dominion Energy, the Plan sponsor, with a cost basis of approximately $115 million and $123 million, respectively. During the year ended December 31, 2025, the Plan purchased approximately $13 million and sold approximately $21 million of common stock of Dominion Energy and recorded dividend income related to Dominion Energy common stock of approximately $5 million.

In addition, the Plan issues loans to participants, which qualify as permitted party-in-interest transactions. Such loans are secured by the vested balances in the participants' accounts.

7. PLAN TERMINATION

Although it has not expressed any intention to do so, the Employer has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions set forth in ERISA. In the event of any termination of the Plan, or upon complete or partial discontinuance of contributions, the accounts of each affected participant shall become fully vested.

8. PROPOSED MERGER

In May 2026, Dominion Energy entered into an Agreement and Plan of Merger (the Merger Agreement) with NextEra Energy, Inc. (NextEra Energy), WG Development Corp., a wholly owned subsidiary of NextEra Energy (Merger Sub Corp), and CS Holdco, LLC, a wholly owned subsidiary of NextEra Energy (LLC Sub). Pursuant to the Merger Agreement, Merger Sub Corp will merge with and into Dominion Energy, with Dominion Energy surviving as a wholly owned subsidiary of NextEra Energy, and immediately thereafter Dominion Energy will merge with and into LLC Sub, with LLC Sub surviving as a wholly owned subsidiary of NextEra Energy (collectively, the Mergers). Under the terms of the Merger Agreement, at the effective time of the first merger, each outstanding share of Dominion Energy common stock, other than shares to be cancelled as described in the Merger Agreement, will be converted into the right to receive (i) its pro rata share of an aggregate amount equal to $360 million in cash, without interest, and (ii) 0.8138 shares of NextEra Energy common stock. The completion of the Mergers is subject to customary closing conditions, including, among others, approval by Dominion Energy shareholders of the Merger Agreement and the applicable plan of merger, approval by NextEra Energy shareholders of the issuance of NextEra Energy common stock in connection with the Mergers, expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (HSR Act), receipt of specified regulatory approvals, including the obtaining by Dominion Energy and NextEra Energy of consents and approvals required under (i) the HSR Act, (ii) the Federal Energy Regulatory Commission, (iii) the U.S. Nuclear Regulatory Commission, (iv) the Virginia State Corporation Commission, (v) the North Carolina Utilities Commission and (vi) the Public Service Commission of South Carolina, approval for listing on the New York Stock Exchange of the NextEra Energy common stock to be issued in the Mergers, effectiveness of the registration statement on Form S-4, accuracy of the parties' representations and warranties, compliance with covenants, and the absence of a material adverse effect on either Dominion Energy or NextEra Energy. Under the terms of the Merger Agreement, the Plan is required to be maintained without amendment for a period of two years following closing.

9. SUBSEQUENT EVENTS

Subsequent events were evaluated through June 24, 2026, the date the financial statements were issued. Other than as discussed in Note 8, no events occurred that require additional disclosure or adjustments to the Plan's financial statements.

DOMINION ENERGY VIRGINIA 401(K) PLAN FOR UNION-REPRESENTED EMPLOYEES

Employer ID No. 54-1229715

Plan Number: 005