AltaGas Ltd. — AGM Information 2023

Mar 23, 2023

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NOTICE OF ANNUAL GENERAL MEETING AND AVAILABILITY OF MEETING MATERIALS

ANNUAL MEETING DATE, TIME AND LOCATION:

Date: Friday, April 28, 2023 Time: 1:00 p.m. (MDT) Where: Brookfield Place, 1410, 225 6 Avenue SW, Calgary, AB Or online at https://web.lumiagm.com/494909679 Password: altagas2023 (case sensitive)

NOTICE AND ACCESS

You are receiving this notice as a beneficial shareholder of AltaGas Ltd. (“ AltaGas ”) because AltaGas is using the notice and access model adopted by the Canadian securities regulators (“ N&A ”) for delivery of meeting materials to its shareholders in respect of the upcoming annual general meeting of shareholders to be held on April 28, 2023, or any adjournment thereof (the “ Meeting ”). In connection with the use of N&A, on January 25, 2023, Corporations Canada exempted AltaGas from mailing paper copies of the management information circular (the “ Circular ”), annual financial statements and the related management’s discussion and analysis (collectively, the “ Meeting Materials ”) to each shareholder whose proxy is solicited.

N&A, as supplemented by this exemption, allows us to post Meeting Materials online. See “Websites Where Meeting Materials Are Posted” below. The use of this alternative means of delivery is more environmentally friendly and reduces printing and mailing costs. Meeting Materials will not be mailed to shareholders unless a shareholder follows the instructions below under “How to Obtain Paper Copies of the Meeting Materials”. Along with this notice, you will have received a voting instruction form enabling you to vote on the matters set out below.

Shareholders with questions about notice and access can call 1-844-916-0609.

MATTERS TO BE VOTED ON AT THE MEETING

At the Meeting, shareholders will be asked to consider and vote on the following matters:

1. APPOINTMENT OF AUDITOR: Shareholders will be asked to re-appoint Ernst & Young LLP as AltaGas’ auditor for the ensuing year and authorize the directors to set their remuneration. Information respecting this matter can be found under the heading “Appointment of Auditors” in the Circular.

2. ELECTION OF DIRECTORS: Shareholders will be asked to elect 10 directors. Information respecting the director nominees may be found under the heading “Director Nominees” in the Circular.

3. ADVISORY VOTE ON EXECUTIVE COMPENSATION: Shareholders will be asked to vote on the non-binding advisory resolution to accept AltaGas’ approach to executive compensation. Information respecting executive compensation may be found under the headings “Compensation Discussion and Analysis” and “Executive Compensation Information” in the Circular.

4. OTHER BUSINESS: Shareholders may be asked to consider other business that may properly be brought before the meeting or any adjournment of the meeting.

For detailed information, please refer to the Circular. The Circular also includes annual disclosure.

WEBSITES WHERE MEETING MATERIALS ARE POSTED

The Meeting Materials can be viewed online at www.sedar.com under AltaGas’ profile or at:

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https://altagas.ca/invest/share-information/noticeandaccess

A request to receive AltaGas’ annual financial statements is included with the voting instruction form accompanying this notice.

HOW TO OBTAIN PAPER COPIES OF THE MEETING MATERIALS

Beneficial shareholders may request that a paper copy of the Meeting Materials be sent to them by postal delivery at no cost. Requests may be made up to one year from the date the Meeting Materials were filed on SEDAR by calling:

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1-877-907-7643

You will need to provide your 16-digit control number which appears on your voting instruction form. If you request Meeting Materials before the Meeting, such materials will be sent to you at no cost within 3 business days of receiving your request. To receive Meeting Materials before the voting deadline specified in the voting instruction form, your request must be received no later than April 14, 2023. Please note that you will not receive another voting instruction form, so please keep the one you received with this notice.

If you request meeting materials on or after the date of the Meeting, such materials will be sent to you within 10 calendar days of receiving your request. Following the Meeting, the documents will remain available on SEDAR indefinitely and will remain available on the website listed above for a period of one year.

VOTING

There are several convenient ways to vote your shares in advance, including

• visiting www.proxyvote.com

• scanning the QR code on your voting instruction form with your smartphone

• mailing your completed voting instruction form in the business reply envelope provided

• calling the toll-free number on your voting instruction form

Along with this notice, you will find a voting instruction form containing detailed instructions on how to vote your shares. You will need the 16-digit control number printed on your voting instruction form to complete the voting.

For additional instructions on how to vote your shares as the proxyholder of the registered shareholder, refer to “How do I vote my Shares?” in the Circular and, if voting online, the “Virtual Meeting User Guide” provided to you with this notice.

Shareholders are reminded to review the Circular prior to voting.

BOARD RECOMMENDATION

The Board of Directors of AltaGas recommends that shareholders VOTE FOR all of the proposed resolutions.

Please submit your vote in accordance with the deadline specified in your voting instruction form, which may be in advance of the proxy deposit deadline of 1:00 p.m. (MDT) on April 26, 2022.

If you have any questions with respect to voting your shares before the proxy deposit deadline, please contact AltaGas’ proxy solicitation agent:

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North American Toll-Free Number: 1-888-777-1639, Outside North America collect: 1-289-695-3075

Email: assistance@morrowsodali.com