Exhibit 32.3

Section 1350 Certification

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, I, Steven L. Lindsey, Chief Executive Officer of Alabama Gas Corporation, hereby certify that:

(a) To the best of my knowledge, the accompanying report on Form 10-Q for the period ended June 30, 2017 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b) To the best of my knowledge, the information contained in the accompanying report on Form 10-Q for the period ended June 30, 2017 fairly presents, in all material respects, the financial condition and results of operations of Alabama Gas Corporation.

Date:	August 2, 2017	Signature:	/s/ Steven L. Lindsey
			Steven L. Lindsey
			Chief Executive Officer

Section 1350 Certification

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, I, Steven P. Rasche, Chief Financial Officer of Alabama Gas Corporation, hereby certify that:

(a) To the best of my knowledge, the accompanying report on Form 10-Q for the period ended June 30, 2017 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b) To the best of my knowledge, the information contained in the accompanying report on Form 10-Q for the period ended June 30, 2017 fairly presents, in all material respects, the financial condition and results of operations of Alabama Gas Corporation.

Date:	August 2, 2017	Signature:	/s/ Steven P. Rasche
			Steven P. Rasche
			Chief Financial Officer