Exhibit 23.3

CONSENT OF INDEPENDENT EXPERTS

Cardno, Inc. hereby consents to the incorporation by reference into this Registration Statement on Form S-3 of TECO Energy, Inc. (the “Company”) of the information contained in our audit report, dated as of January 22, 2015, regarding the coal reserves of the Company’s subsidiaries, the results of which audit are reflected in the Company’s Annual Report on Form 10-K.

Cardno, Inc.

February 23, 2015