Exhibit 99.1

EXECUTION VERSION

August 19, 2014

The Laclede Group, Inc.

720 Olive Street

Saint Louis, Missouri 63101

Attention: Steven P. Rasche, Chief Financial Officer

Project Namath – 2^nd Amendment to the Commitment Letter

Ladies and Gentlemen:

Reference is hereby made to the (i) Project Namath-Commitment Letter and the Annexes attached thereto, dated as of April 5, 2014, from Credit Suisse AG (acting through such of its affiliates or branches as it deems appropriate, “Credit Suisse AG”), Credit Suisse Securities (USA) LLC (“Credit Suisse Securities” and together with Credit Suisse AG, “Credit Suisse”), Wells Fargo Bank, National Association (“Wells Fargo Bank”), Wells Fargo Securities, LLC (“Wells Fargo Securities” and, collectively with Credit Suisse AG, Credit Suisse Securities and Wells Fargo Bank, the “Commitment Parties”) to The Laclede Group, Inc. (the “Borrower”), as amended by the First Amendment to the Commitment Letter dated as June 16, 2014, and (ii) the Project Namath-Joinder Agreement to Commitment Letter, dated as of April 28, 2014, between the Commitment Parties, the New Lenders and the Borrower ((i) and (ii) collectively, the “Commitment Letter”). Capitalized terms used in this agreement (this “Amendment”) but not defined herein shall have the respective meanings assigned to such terms in the Commitment Letter.

On the date hereof, the Borrower completed offerings of $625 million of Senior Notes. The parties hereto agree that, effective from the date of this Amendment, the amount of the Facility, and the corresponding Commitments of the Commitment Parties, shall be reduced to $0 and that the obligations of the Borrower and the Commitment Parties under the Commitment Letter are terminated, except to the extent they survive such termination pursuant to the express terms of the Commitment Letter.

To induce the Commitment Parties to enter into this Amendment, the Borrower hereby represents and warrants to the Commitment Parties that the reduction and termination of the Facility evidenced by this Amendment does not require any consent by the Seller, or if such consent is required, then such consent has been obtained pursuant to the terms of the Acquisition Agreement on or prior to the date hereof.

PARAGRAPH 12 OF THE COMMITMENT LETTER IS HEREBY INCORPORATED HEREIN BY REFERENCE AND SHALL APPLY HEREUNDER AS IF FULLY SET FORTH HEREIN.

Each party hereto agrees to maintain the confidentiality of this Amendment and the terms hereof in accordance with the confidentiality and disclosure provisions set forth in Section 8 of the Commitment Letter. For the avoidance of doubt, the Borrower may file a copy of this Amendment in any required filings with the Securities and Exchange Commission or other applicable regulatory authorities and stock exchanges pursuant to proviso (B) of Section 8(a) of the Commitment Letter.

Each party hereto agrees that this Amendment is not intended to, and does not, confer upon any person other than the parties hereto any rights or remedies hereunder.

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[Signature Page to Second Amendment to Commitment Letter]

[Signature Page to Second Amendment to Commitment Letter]

[Signature Page to Second Amendment to Commitment Letter]

[Signature Page to Second Amendment to Commitment Letter]