Edgar Filing: INTEGRYS ENERGY GROUP, INC.

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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 11-K

ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 for the fiscal year ended December 31, 2006

TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 for the transition period from

_____________________ to _____________________

Commission File Number 33-35050

A.	Full title of the plan and the address of the plan, if different from that of the issuer named below:

Wisconsin Public Service Corporation

Employee Stock Ownership Plan

B.	Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

Integrys Energy Group, Inc.

(formerly known as WPS Resources Corporation)

130 East Randolph Drive

Chicago, IL 60601

The Exhibit Index is on page 15 of the sequentially numbered pages.

Page 1 of 15

REQUIRED INFORMATION

The following financial statements and schedules of the Wisconsin Public Service Corporation Employee Stock Ownership Plan, prepared in accordance with the financial reporting requirements of the Employee Retirement Income Securities Act of 1974, as amended, are filed herewith.

Page 2 of 15

Wisconsin Public Service
Corporation Employee Stock
Ownership Plan & Trust

Financial Statements as of and for the Years Ended
December 31, 2006 and 2005, Supplemental
Schedule as of December 31, 2006, and Report of
Independent Registered Public Accounting Firm

Page 3 of 15

WISCONSIN PUBLIC SERVICE CORPORATION EMPLOYEE STOCK OWNERSHIP PLAN & TRUST TABLE OF CONTENTS

	Page

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM	1

FINANCIAL STATEMENTS AS OF AND FOR THE YEARS ENDED DECEMBER 31, 2006 AND 2005:

Statements of Net Assets Available for Benefits	2

Statements of Changes in Net Assets Available for Benefits	3

Notes to Financial Statements	4-7

SUPPLEMENTAL SCHEDULE—	8

Form 5500, Schedule H, Part IV, Line 4i—Schedule of Assets (Held at End of Year) as of December 31, 2006	9

NOTE: All other schedules required by Section 2520.103-10 of the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974 have been omitted because they are not applicable.

Page 4 of 15

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Integrys Energy Group

Employee Benefits Administrator Committee:

We have audited the accompanying statements of net assets available for benefits of Wisconsin Public Service Corporation Employee Stock Ownership Plan & Trust (the “Plan”) as of December 31, 2006 and 2005, and the related statements of changes in net assets available for benefits for the years then ended. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2006 and 2005, and the changes in net assets available for benefits for the years then ended in conformity with accounting principles generally accepted in the United States of America.

Our audits were conducted for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedule of assets (held at end of year) as of December 31, 2006, is presented for the purpose of additional analysis and is not a required part of the basic financial statements, but is supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. This schedule is the responsibility of the Plan’s management. Such schedule has been subjected to the auditing procedures applied in our audit of the basic 2006 financial statements and, in our opinion, is fairly stated in all material respects when considered in relation to the basic financial statements taken as a whole.

May 9, 2007

Page 5 of 15

WISCONSIN PUBLIC SERVICE CORPORATION
EMPLOYEE STOCK OWNERSHIP PLAN & TRUST

STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
AS OF DECEMBER 31, 2006 AND 2005


	2006		2005

ASSETS:
Investment in common stock of WPS Resources Corporation - at fair market value	$	122,931,541	$	120,757,825
Receivable from Wisconsin Public Service Corporation		172,427		192,345
Money market fund		223		96

Total assets		123,104,191		120,950,266

NET ASSETS AVAILABLE FOR BENEFITS	$	123,104,191	$	120,950,266


See notes to financial statements.

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WISCONSIN PUBLIC SERVICE CORPORATION
EMPLOYEE STOCK OWNERSHIP PLAN

STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
FOR THE YEARS ENDED DECEMBER 31, 2006 AND 2005


	2006			2005

ADDITIONS:
Employer contributions	$	8,345,878		$	8,032,013

Investment income:
Dividend income		5,150,102			4,996,477
Interest income		65			7
Net (depreciation) appreciation in fair value of common stock		(2,258,531	)		11,364,722

Total investment income		2,891,636			16,361,206

Total additions		11,237,514			24,393,219

DEDUCTIONS:
Distributions to participants		8,753,210			12,634,339
Dividend distributions		330,379			313,437

Total deductions		9,083,589			12,947,776

Net increase		2,153,925			11,445,443

NET ASSETS AVAILABLE FOR BENEFITS:
Beginning of year		120,950,266			109,504,823

End of year	$	123,104,191		$	120,950,266



See notes to financial statements.

Page 7 of 15

WISCONSIN PUBLIC SERVICE CORPORATION

EMPLOYEE STOCK OWNERSHIP PLAN & TRUST

NOTES TO FINANCIAL STATEMENTS

AS OF AND FOR THE YEARS ENDED DECEMBER 31, 2006 AND 2005

1.	DESCRIPTION OF THE PLAN

The following brief description of the Wisconsin Public Service Corporation Employee Stock Ownership Plan & Trust (the “Plan”) is provided for general information purposes only. Participants should refer to the Plan document, as amended, for more complete information.

General—Wisconsin Public Service Corporation (the “Company”), a wholly owned subsidiary of Integrys Energy Group, Inc. (“Integrys”) (known as WPS Resources Corporation prior to its merger with Peoples Energy on February 21, 2007), established the Plan effective January 1, 1975 as a defined contribution employee stock ownership plan. The Plan invests principally in Integrys common stock. The Plan is designed to comply with Section 4975(e)(7) and the regulations thereunder of the Internal Revenue Code of 1986, as amended (the “Code”), and is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”).

Overall responsibility for administering the Plan rests with the Employee Benefits Administrator Committee (the “Committee”) which consists of Integrys employees. Wells Fargo Bank N.A. (“Trustee”) is responsible for the management and control of the Plan’s assets and has discretionary responsibility for the investments and management of such assets. Wells Fargo Bank N.A., is also the recordkeeper for the Plan and maintains the individual participant accounts.

Eligibility—Employees of Integrys and its participating subsidiaries are generally eligible to participate in the Plan except for limited-term employees (unless limited-term employees work 1,000 hours and/or are participating in the Company’s Employee Savings Plan) and non-administrative employees of Upper Peninsula Power Company (“UPPCO”). Employees of Empire State, Michigan Gas Utilities Corporation, Minnesota Energy Resources Corporation (subsidiaries of Integrys), and Wisconsin River Power Company, an affiliate of Integrys, also are not eligible to participate. Limited-term employees are defined under the Plan as employees of the Company or any affiliate who are hired for a limited period of time, such as temporary summer help or as a student employee who is scheduled to perform services during summer or semester breaks.

Participant Accounts—The Plan is a defined contribution plan under which separate individual accounts are established for each participant. At the end of each quarter, each participant’s account is allocated its proportionate number of shares and any change in fair market value since the preceding quarter. Fair market value is determined by the number of shares held and the closing price of the Company’s stock for the coinciding day.

Vesting—Participants are immediately vested in their accounts.

Employer Contributions—Part of the Company contributions to the Plan reflect amounts included in the cost of service for rate setting purposes by the Public Service Commission of Wisconsin and Federal Energy Regulatory Commission.

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Contributions for administrative employees are determined using a formula that is different than the formula for determining contributions for non-administrative employees. Contributions to the Plan on behalf of eligible administrative employees are made in Integrys common stock with a value equal to a 100% match on the first 4% and a 50% match on the next 2% of eligible pay that each participant defers into the Wisconsin Public Service Corporation Administrative Employees’ Savings Plan. The total match is limited to a maximum of 5% of eligible pay. Such contributions totaled $5,988,380 and $5,446,153 for 2006 and 2005, respectively. Company contributions to the Plan on behalf of eligible non-administrative employees are based on 2% of a participant’s gross pay, as defined. Also pursuant to a union contract with Local 310, the Company contributes to the Plan on behalf of eligible non-administrative employees an additional 1.7% of a participant’s base pay. Contributions for non-administrative employees totaled $2,357,498 and $2,585,860 for 2006 and 2005, respectively.

Investments—Contributions to the Plan are non-participant directed. The Plan is invested primarily in Integrys Energy Group, Inc. common stock.

Payment of Benefits—Benefits paid to participants represent the amount paid during the year to participants who elected to receive the distribution of their vested account balance. Non-administrative participants may withdraw from their account shares that have been held at least 84 months. Administrative participants may withdraw from their account shares that were received prior to January 1, 2001, and held for at least 84 months. For administrative employees, shares received after January 1, 2001, may be withdrawn only upon termination or retirement.

Former employees may elect to receive distributions quarterly as described in the Plan document, or may defer distribution until the year they attain age 69. Participants who die, become disabled or retire are entitled to distribution at the next withdrawal opportunity. To the extent provided for by a qualified domestic relations order, and as determined by the administrator, a lump sum payment may be made to an alternate payee under such order at the next withdrawal opportunity. Fractional shares are paid in cash.

Dividend Distributions—Each eligible participant may elect, for dividends declared and payable on stock that is allocated to the participant account, to be paid in cash directly to the participant or be reinvested in the participant’s account.

Voting Rights—Each participant is entitled to exercise voting rights attributable to the shares allocated to the participant’s account. Each participant is notified by the Trustee prior to the time that such rights are to be exercised. The Trustee is not permitted to vote any share for which instructions have not been given by a participant.

Termination—Although it has not expressed any intention to do so, the Company reserves the right to terminate the Plan at anytime, subject to Plan provisions and applicable provisions of ERISA. If the Plan were to terminate, each participant’s interest in the Plan would be distributed to each participant or to each participant’s beneficiary as prescribed by the Plan and the Code at the time of termination. Upon termination of the Plan, the Committee shall direct the Trustee to pay all liabilities and expenses of the Plan.

2.	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Accounting—The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America.

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Investment Valuation and Income Recognition—Investments in Integrys Energy Group, Inc. common stock are stated at fair market value based on the closing price reported by the New York Stock Exchange at year-end. Dividends are recorded on the ex-dividend date. Interest income is recorded on the accrual basis. Purchases and sales of securities are recorded on a trade date basis.

Contributions Receivable—The Plan records employer contributions receivable when earned by the participants.

Operating Expenses—All expenses of maintaining the Plan are initially paid by the Company, with reimbursement from affiliates for their share of these expenses, and thus are not reflected in the Plan’s financial statements. Such expenses paid by Integrys were $156,447 and $112,314 for the plan years ended December 31, 2006 and 2005, respectively.

Payment of Benefits—Benefit payments to participants are recorded upon distribution. There were no benefits payable as of December 31, 2006 and 2005.

Use of Estimates—The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires Plan management to make estimates and assumptions that affect the reported amounts of assets, liabilities, and changes therein and disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

Risks and Uncertainties—The Plan utilizes various investment instruments, but primarily investments in shares of Integrys Energy Group, Inc. common stock. Investment securities, in general, are exposed to various risks, such as interest rate, credit, and overall market volatility. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the amounts reported in the financial statements.

3.	INVESTMENT IN COMMON STOCK

The Plan is primarily invested in shares of Integrys Energy Group, Inc. common stock. These shares are held in a bank-administered trust fund.

The fair market value and net (depreciation) appreciation in fair market value for the years ended December 31, 2006 and 2005, are as follows:

	Number of Shares at December 31, 2006		Fair Value at December 31, 2006 ($54.03 Per Share)

Fair value of Integrys Energy Group, Inc. common stock - held by the Plan		2,275,246	$	122,931,541

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	Number of Shares at December 31, 2005			Fair Value at December 31, 2005 ($55.31 Per Share)

Fair value of Integrys Energy Group, Inc. common stock - held by the Plan		2,183,291		$	120,757,825


	2006			2005

Net (depreciation) appreciation in fair value of investments	$	(2,258,531	)	$	11,364,722

4.	EXEMPT PARTY-IN-INTEREST TRANSACTIONS

Certain Plan short-term investments are made in shares of money market funds managed by Wells Fargo Bank N.A. Wells Fargo Bank N.A. is the trustee as defined by the Plan and, therefore, these transactions qualify as exempt party-in-interest transactions.

At December 31, 2006 and 2005, the Plan held 2,275,246 and 2,183,291 shares, respectively, of common stock of Integrys Energy Group, Inc., the sponsoring employer, with a cost basis of $79,253,346 and $71,783,992, respectively. During the years ended December 31, 2006 and 2005, the Plan recorded dividend income of $5,150,102 and $4,996,477, respectively, from investments in common stock of Integrys Energy Group, Inc.

5.	FEDERAL INCOME TAX STATUS

The Internal Revenue Service has determined and informed the Company by a letter dated March 5, 2003, that the Plan and related trust were designed in accordance with applicable regulations of the Internal Revenue Code (“IRC”). The Plan has been amended since receiving the determination letter. However, the Company and the Plan administrator believe that the Plan is currently designed and operated in compliance with applicable requirements of the IRC and the Plan and related trust continue to be tax-exempt. Therefore, no provision for income taxes has been included in the Plan’s financial statements.

* * * * * *

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SUPPLEMENTAL SCHEDULE FURNISHED

PURSUANT TO

DEPARTMENT OF LABOR’S RULES AND REGULATIONS

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WISCONSIN PUBLIC SERVICE CORPORATION
EMPLOYEE STOCK OWNERSHIP PLAN

FORM 5500, SCHEDULE H, PART IV, LINE 4i -
SCHEDULE OF ASSETS (HELD AT END OF YEAR)
AS OF DECEMBER 31, 2006


	Description of Investment,
	Including Maturity Date, Rate
Identity of Issue, Borrower,	of Interest, Collateral, Par,			Current
Lessor, or Similar Party	or Maturity Value	Cost		Value

Integrys Energy Group, Inc.*	2,275,246 shares of common stock	$	79,253,346	$	122,931,541

Wells Fargo Short-Term Investment
Money Market Fund*	223 shares		223		223

		$	79,253,569	$	122,931,764


* Indicates a party-in-interest.

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SIGNATURES

The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the Plan Administrator of the Wisconsin Public Service Corporation Employee Stock Ownership Plan has duly caused this Annual Report to be signed on its behalf by the undersigned hereunto duly authorized, in the City of Green Bay and the State of Wisconsin this 21st day of June 2007.

WISCONSIN PUBLIC SERVICE CORPORATION

EMPLOYEE STOCK OWNERSHIP PLAN

PLAN ADMINISTRATOR

/s/ Diane L. Ford

Diane L. Ford