2014 TEG 10-K Exhibit 23.1

We consent to the incorporation by reference in Registration Statement Nos. 333-186988 and 333-183172 on Form S-3, 333-136911 on Form S-4, and 333-195989, 333-168540, 333-150312, 333-150311, 333-71990, 333-71992, and 333-127889 on Form S-8 of our reports dated March 2, 2015 relating to the financial statements and financial statement schedules of Integrys Energy Group, Inc. and subsidiaries, and the effectiveness of Integrys Energy Group, Inc. and subsidiaries’ internal control over financial reporting, appearing in this Annual Report on Form 10-K of Integrys Energy Group, Inc. and subsidiaries for the year ended December 31, 2014.