For Release: 02/25/2010

Integrys Energy Group, Inc. Reports 2009 Fourth Quarter Financial Results

Chicago - February 25, 2010 - Integrys Energy Group, Inc. (NYSE: TEG) recognized net income attributed to common shareholders on a GAAP (generally accepted accounting principles) basis of $23.5 million ($0.31 diluted earnings per share) for the quarter ended December 31, 2009, compared with net income attributed to common shareholders on a GAAP basis of $25.6 million ($0.33 diluted earnings per share) for the quarter ended December 31, 2008.

Fourth quarter 2009 net income attributed to common shareholders of $23.5 million included $16.1 million of certain after-tax items, consisting of $16.8 million of net after-tax losses, primarily driven by timing differences caused by the accounting treatment for derivative and non-derivative contracts related to the sale of the wholesale natural gas marketing business in conjunction with Integrys Energy Services Inc.'s strategy change, and $13.8 million of after-tax restructuring expense related to both the Integrys Energy Services strategy change and reductions in the workforce implemented at Integrys Energy Group, partially offset by $14.5 million of net after-tax non-cash gains related to derivative and inventory accounting activities at Integrys Energy Services. Fourth quarter 2008 net income attributed to common shareholders of $25.6 million included $41.9 million of net after-tax non-cash losses related to derivative and inventory accounting activities at Integrys Energy Services. Exclusive of these certain after-tax items recognized in the fourth quarters of 2009 and 2008, Integrys Energy Group's earnings would have decreased $27.9 million quarter-over-quarter, from net income attributed to common shareholders of $67.5 million ($0.88 diluted earnings per share) for the quarter ended December 31, 2008, to net income attributed to common shareholders of $39.6 million ($0.51 diluted earnings per share) for the quarter ended December 31, 2009.

"We view 2009 as a successful year in a number of ways," said Charles A. Schrock, President and Chief Executive Officer of Integrys Energy Group. "First, our 2009 full-year financial results exceeded our expectations. Second, we completed five rate cases, an important achievement that, when combined with our focus on operational excellence and continued cost control measures, will help our regulated utilities move closer toward their authorized returns on equity in the future. Finally, we achieved our key strategic objectives for Integrys Energy Services, and our restructured nonregulated energy services business is positioned for controlled growth with a recurring customer-based business, reduced size, and lower risk profile. We are confident that Integrys Energy Group is well-positioned for the future."

Highlights:

Details regarding Integrys Energy Group's financial results for the quarters ended December 31 are as follows:

Integrys Energy Group's GAAP Results
(Millions, except per share amounts)
2009 2008 Change
Net income attributed to common shareholders $23.5 $25.6 (8.2%)
Basic earnings per share $0.31 $0.33 (6.1%)
Diluted earnings per share $0.31 $0.33 (6.1%)
Average shares of common stock
Basic 76.8 76.7 0.1%
Diluted 77.0 77.0 -%

Significant factors impacting the change in earnings and earnings per share were as follows:

2009 Full Year Results

Integrys Energy Group recognized a net loss attributed to common shareholders on a GAAP basis of $70.9 million ($0.92 net loss per share) for the year ended December 31, 2009, compared with net income attributed to common shareholders on a GAAP basis of $126.4 million ($1.64 diluted earnings per share) for the year ended December 31, 2008.

The net loss attributed to common shareholders for the year ended December 31, 2009 of $70.9 million included $274.0 million of certain after-tax items, consisting of a $248.8 million after-tax non-cash goodwill impairment loss related to the natural gas utility segment, $14.9 million of net after-tax losses, primarily driven by timing differences caused by the accounting treatment for derivative and non-derivative contracts related to the sale of certain Integrys Energy Services' businesses in conjunction with its strategy change, and $27.2 million of after-tax restructuring expense related to both the Integrys Energy Services strategy change and reductions in the workforce implemented at Integrys Energy Group, partially offset by $16.9 million of net after-tax non-cash gains related to derivative and inventory accounting activities at Integrys Energy Services. Net income attributed to common shareholders for the year ended December 31, 2008 of $126.4 million included $90.9 million of net after-tax non-cash losses related to derivative and inventory accounting activities at Integrys Energy Services and a $6.5 million after-tax non-cash goodwill impairment loss related to the regulated natural gas utility segment. Exclusive of these certain after-tax items recognized during the years ended December 31, 2009 and 2008, Integrys Energy Group's earnings would have decreased $20.7 million year-over-year from net income attributed to common shareholders of $223.8 million ($2.91 diluted earnings per share) for the year ended December 31, 2008, to net income attributed to common shareholders of $203.1 million ($2.64 diluted earnings per share) for the year ended December 31, 2009.

Earnings Forecast

As announced last week at our investor and analyst day presentation, the projected guidance range for 2010 diluted earnings per share is anticipated to be between $3.09 and $3.37. In 2011, the projected guidance range for diluted earnings per share is anticipated to be between $3.28 and $3.61. This guidance assumes operational improvements and rate relief for certain utilities, the availability of generation units, and normal weather conditions. This guidance does not include any Integrys Energy Group restructuring costs related to reductions in the workforce that are currently in progress (other than those at Integrys Energy Services). Please see the "Diluted Earnings Per Share Guidance Information" included at the end of this news release and also included with the supplemental data package on the company's Web site for more detailed information on earnings guidance.

Integrys Energy Group expects a long-term diluted earnings per share growth rate of 4% to 6% on an average annualized basis, using 2011 as the base year, through 2015.

Integrys Energy Group's management will discuss earnings guidance for 2010 and also for 2011, during its earnings conference call at 8 a.m. CST on Friday, February 26.

Supplemental Data Package

Concurrent with this news release, a supplemental data package has been posted on Integrys Energy Group's corporate Web site that includes this narrative news release, as well as financial statements, non-GAAP financial information, diluted earnings per share guidance information, and supplemental quarterly financial information by reportable segment.

Conference Call

An earnings conference call is scheduled for 8 a.m. CST on Friday, February 26, 2010. Integrys Energy Group will discuss 2009 fourth quarter and full year financial results, as well as future prospects. To access the call, which is open to the public, call 888 788 9425 (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. A replay of the conference call will be available through May 4, 2010, by dialing 888-568-0411 (toll free).

Investors may also listen to the conference live on Integrys Energy Group's corporate Web site at http://www.integrysgroup.com/investor/presentations.aspx. An archive of the Webcast will be available on the company's Web site at http://www.integrysgroup.com/investor/presentations.aspx.

In conjunction with this conference call, Integrys Energy Group will post on its Web site PowerPoint slides that will be referred to within the prepared remarks during the call. The slides will be available at 6:00 a.m. CST on February 26.

Forward-Looking Statements

Financial results in this news release are unaudited. In this news release, Integrys Energy Group and its subsidiaries make statements concerning expectations, beliefs, plans, objectives, goals, strategies, and future events or performance. Such statements are "forward-looking statements" within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements are subject to assumptions and uncertainties; therefore, actual results may differ materially from those expressed or implied by such forward-looking statements. Although Integrys Energy Group and its subsidiaries believe that these forward-looking statements and the underlying assumptions are reasonable, they cannot provide assurance that such statements will prove correct.

Forward-looking statements include, among other things, statements concerning management's expectations and projections regarding earnings, regulatory matters, fuel costs, sources of electric energy supply, coal and natural gas deliveries, remediation costs, environmental and other capital expenditures, liquidity and capital resources, trends, estimates, completion of construction projects, and other matters.

Forward-looking statements involve a number of risks and uncertainties. Some risks that could cause results to differ from any forward-looking statement include those described in Item 1A of Integrys Energy Group's Annual Report on Form 10-K for the year ended December 31, 2009. Other factors include:

Except to the extent required by the federal securities laws, Integrys Energy Group and its subsidiaries undertake no obligation to publicly update or revise any forward looking statements, whether as a result of new information, future events, or otherwise.

About Integrys Energy Group, Inc.

Integrys Energy Group is a diversified holding company with regulated utility operations operating through six wholly owned subsidiaries, Wisconsin Public Service Corporation, The Peoples Gas Light and Coke Company, North Shore Gas Company, Upper Peninsula Power Company, Michigan Gas Utilities Corporation, and Minnesota Energy Resources Corporation; nonregulated operations through its wholly owned nonregulated subsidiary, Integrys Energy Services; and also a 34% equity ownership interest in American Transmission Company LLC (an electric transmission company operating in Wisconsin, Michigan, Minnesota, and Illinois).

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

Unaudited Financial Statements

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