UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

 

FORM 10-Q

 

| x      | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE |
|--------|------------------------------------------------------------------------------|
|   | ACT OF 1934                                                                  |  
 

For the quarterly period ended **March 31, 2006**

 
or

o

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE

 

ACT OF 1934

 
 

For the transition period from _______ to _______

 
 

Commission

Name of Registrant, State of Incorporation,

IRS Employer

File Number

Address of Principal Executive Offices and Telephone Number

Identification Number

1-9894

ALLIANT ENERGY CORPORATION

39-1380265

 

(a Wisconsin corporation)

 

 

4902 N. Biltmore Lane

 

 

Madison, Wisconsin 53718

 

 

Telephone (608)458-3311

 

 

 

 

0-4117-1

INTERSTATE POWER AND LIGHT COMPANY

42-0331370

 

(an Iowa corporation)

 

 

Alliant Energy Tower

 

 

Cedar Rapids, Iowa 52401

 

 

Telephone (319)786-4411

 

 

 

 

0-337

WISCONSIN POWER AND LIGHT COMPANY

39-0714890

 

(a Wisconsin corporation)

 

 

4902 N. Biltmore Lane

 

 

Madison, Wisconsin 53718

 

 

Telephone (608)458-3311

 

 

This combined Form 10-Q is separately filed by Alliant Energy Corporation, Interstate Power and Light Company and Wisconsin Power and Light Company.  Information contained in the Form 10-Q relating to Interstate Power and Light Company and Wisconsin Power and Light Company is filed by such registrant on its own behalf.  Each of Interstate Power and Light Company and Wisconsin Power and Light Company makes no representation as to information relating to registrants other than itself.

 

Indicate by check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorterperiod that the registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days.  Yes x     No o

 

Indicate by check mark whether the registrants are large accelerated filers, accelerated filers, or non-accelerated filers.  See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act.

Alliant Energy Corporation

Large accelerated filer x

Accelerated filer o

Non-accelerated filer o

Interstate Power and Light Company

Large accelerated filer o

Accelerated filer o

Non-accelerated filer x

 
Wisconsin Power and Light Company

Large accelerated filer o

Accelerated filer o

Non-accelerated filer x

 
 

Indicate by check mark whether the registrants are shell companies (as defined in Rule 12b-2 of the Exchange Act).

Yes o

No x

 

Number of shares outstanding of each class of common stock as of April 28, 2006:

Alliant Energy Corporation

Common stock, $0.01 par value, 117,539,646 shares outstanding

Interstate Power and Light Company

Common stock, $2.50 par value, 13,370,788 shares outstanding (all of which

 

are owned beneficially and of record by Alliant Energy Corporation)

Wisconsin Power and Light Company

Common stock, $5 par value, 13,236,601 shares outstanding (all of which are

 

owned beneficially and of record by Alliant Energy Corporation)

 

 

**TABLE OF CONTENTS**

 

Page

Part I.**

Financial Information**

2

Item 1.

Condensed Consolidated Financial Statements (Unaudited)

2

 

Alliant Energy Corporation:

 

 

Condensed Consolidated Statements of Income for the Three Months Ended March 31, 2006 and 2005

2

 

Condensed Consolidated Balance Sheets as of March 31, 2006 and Dec. 31, 2005

3

 

Condensed Consolidated Statements of Cash Flows for the Three Months Ended

 

 

    March 31, 2006 and 2005

5

 

Notes to Condensed Consolidated Financial Statements

6

 

Interstate Power and Light Company:

 

 

Condensed Consolidated Statements of Income for the Three Months Ended March 31, 2006 and 2005

24

 

Condensed Consolidated Balance Sheets as of March 31, 2006 and Dec. 31, 2005

25

 

Condensed Consolidated Statements of Cash Flows for the Three Months Ended

 

 

    March 31, 2006 and 2005

27

 

Notes to Condensed Consolidated Financial Statements

28

 

Wisconsin Power and Light Company:

 

 

Condensed Consolidated Statements of Income for the Three Months Ended March 31, 2006 and 2005

31

 

Condensed Consolidated Balance Sheets as of March 31, 2006 and Dec. 31, 2005

32

 

Condensed Consolidated Statements of Cash Flows for the Three Months Ended

 

 

    March 31, 2006 and 2005

34

 

Notes to Condensed Consolidated Financial Statements

35

Item 2.

Management’s Discussion and Analysis of Financial Condition and Results of Operations

37

Item 3.

Quantitative and Qualitative Disclosures About Market Risk

48

Item 4.

Controls and Procedures

48

Part II.

Other Information

48

Item 1A.

Risk Factors

48

Item 2.

Unregistered Sales of Equity Securities and Use of Proceeds

48

Item 6.

Exhibits

49

 

Signatures

49

1

 

**PART I. FINANCIALINFORMATION**

**ITEM 1.  CONDENSEDCONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)**

**ALLIANT ENERGYCORPORATION** |