Integrys Energy Group, Inc. Announces Third Quarter 2007 Earnings Conference Call

Chicago -- On Thursday, November 8, at 10 a.m. CST, the executive management of Integrys Energy Group, Inc. (NYSE: TEG), will host a conference call to review third quarter 2007 financial results and prospects going forward for 2008 and beyond. The associated earnings release will be issued after market close on November 7. A packet of detailed financial information will be available on the Integrys Energy Group web site on November 8, at 6 a.m. CST.

To access the conference call, which is open to the public, call 888-690-9634 (toll free) 15 minutes prior to the scheduled start time. Callers will be required to supply EARNINGS as the passcode and MR. STEVEN ESCHBACH as the leader. Callers will be placed on hold with music until the call begins.

Integrys Energy Group will webcast the event live at http://www.integrysgroup.com/investor/presentations.aspx.

If you are unable to participate in the live event, the rebroadcast of the complete conference call will be available for replay from 12 noon CST on November 8, 2007, until January 31, 2008, at 11:59 p.m. CST. To access the replay, call 866 352-7720 (toll free). An archive of the webcast will also be available on the company’s web site at http://www.integrysgroup.com/investor/presentations.aspx.