Integrys Energy Group, Inc. to Present at Midwest Utilities Seminar

GREEN BAY, Wis., April 4 /PRNewswire-FirstCall/ — Joseph P. O’Leary, Senior Vice President and Chief Financial Officer of Integrys Energy Group, Inc. (NYSE:TEG) , will make a presentation to financial analysts attending the Midwest Utilities Seminar sponsored by Wall Street Access and Berenson & Company in Chicago on Tuesday, April 10, 2007, at 10:15 a.m. Central time.

Interested parties can access a live audio webcast of the presentation on the company’s web site at . A replay of the presentation will be available and archived on the Investor section of Integrys Energy Group’s Web site for those unable to participate in the live event.

The presentation will be placed on Integrys Energy Group’s web site simultaneous with the start of the presentation. To access the presentation from Integrys Energy Group’s home page, select Investor, then select Presentations.

About Integrys Energy Group, Inc.

Integrys Energy Group, Inc. (NYSE:TEG) , headquartered in Chicago, Illinois, is a holding company for energy related subsidiaries which includes regulated utilities and nonregulated subsidiaries.

  The six regulated utilities consist of:

— The Peoples Gas Light and Coke Company is a natural gas utility
serving approximately 840,000 customers in the City of Chicago.
— Wisconsin Public Service Corporation is a regulated electric and
natural gas utility serving approximately 429,000 electric customers
and 312,000 natural gas customers in northeastern Wisconsin and an
adjacent portion of Michigan’s Upper Peninsula.
— Minnesota Energy Resources Corporation is a natural gas utility
serving approximately 207,000 customers throughout Minnesota.
— Michigan Gas Utilities Corporation is a natural gas utility serving
approximately 166,000 customers in lower Michigan.
— North Shore Gas Company is a natural gas utility serving approximately
158,000 customers in the northern suburbs of Chicago.
— Upper Peninsula Power Company is an electric utility that serves
approximately 52,000 customers in Michigan’s Upper Peninsula.

The nonregulated subsidiaries include:

— Integrys Energy Services, Inc., is a diversified nonregulated energy
supply and services company serving commercial, industrial and
wholesale customers and aggregated groups of residential customers.
Its principal market is the northeast quadrant of the United States
and adjacent portions of Canada. Its principal operations are in
Illinois, Maine, Michigan, Ohio, Texas, Virginia, and Wisconsin in the
United States and Alberta, Ontario, and Quebec in Canada. Integrys
Energy Services also owns and/or operates nonregulated electric
generation facilities.
— Peoples Energy Production Company is primarily engaged in the
acquisition and development of proven onshore natural gas reserves
with upside potential in a limited number of strategic supply basins.
Value is then added through drilling programs, production enhancements
and reservoir optimization.

More information about Integrys Energy Group, Inc. is available online at .

First Call Analyst:
FCMN Contact:

Source: Integrys Energy Group, Inc.