Page

ITEM 1 - Organization Chart

3

ITEM 2 - Issuances and Renewals of Securities and Capital Contributions

5

ITEM 3 - Associate Transactions

6

ITEM 4 - Summary of Aggregate Investment

7

ITEM 5 - Other Investments

8

ITEM 6 - Financial Statements and Exhibits

8

SIGNATURES

8

EXHIBIT A

9

Name of Company

(Organization Chart Hierarchy)

(Inactive companies denoted with (*))

(Reporting companies denoted with (**))

Energy-

or Gas

-Related

Company

Date of

Organization

State of

Organization

Percentage

of Voting

Securities

Held

Nature

of

Business

(a)

Alliant Energy Corporation

N/A

N/A

N/A

N/A

N/A

Alliant Energy TransCo LLC

N/A

N/A

N/A

N/A

N/A

   TRANSLink Development Company LLC (*) (**)

Energy

6/7/02

Delaware

16%

(vii) – 4

Distribution Vision 2010, LLC (**)

Energy

10/2/01

Delaware

21%

(vii) – 3

Wisconsin Power and Light Company

N/A

N/A

N/A

N/A

N/A

   Dais Analytic Corporation (**)

Energy

4/19/93

New York

‹1%

(ii)

Alliant Energy Resources, Inc.

N/A

N/A

N/A

N/A

N/A

   ADI Thermal Power Corporation (**)

Energy

8/11/97

Washington

4%

(ii)

   Alliant Energy EPC, LLC (**)

Energy

5/24/04

Wisconsin

100%

(vii) – 5

   CellTech Power, Inc. (**)

Energy

5/1/00

Delaware

1%

(ii)

   Nth Power Technologies Fund II, LP (**)

Energy

2/25/00

California

8%

(ii)

   STM Power, Inc. (**)

Energy

3/17/03

Delaware

‹ 1%

(ii)

   Alliant Energy Integrated Services Company

N/A

N/A

N/A

N/A

N/A

   Industrial Energy Applications, Inc. (**)

Energy

9/22/83

Iowa

100%

(i)

   RMT, Inc. (**)

Energy

7/29/83

Wisconsin

100%

(vii) – 1

   RMT North Carolina, Inc. (**)

Energy

4/6/69

North Carolina

100%

(vii) – 1

   RMT, Inc., Michigan (**)

Energy

12/15/95

Michigan

100%

(vii) – 1

   RMT International, Inc. (**)

Energy

10/9/97

Wisconsin

100%

(vii) – 1

   Alliant Energy Synfuel LLC

N/A

N/A

N/A

N/A

N/A

   Kaufman & Broad-Nexgen LLC

N/A

N/A

N/A

N/A

N/A

   West Virginia Synfuel LP

N/A

N/A

N/A

N/A

N/A

   Alpha Synfuel LLC

N/A

N/A

N/A

N/A

N/A

   New River Synfuel LLC (**)

Energy

3/9/98

Colorado

22%

(vi)

   Heartland Energy Group, Inc. (*) (**)

Energy

6/1/95

Wisconsin

100%

(v)

   Industrial Energy Applications

  Delaware, Inc.

N/A

N/A

N/A

N/A

N/A

   Oak Hill Pipeline LP (**)

Energy

4/1/97

Texas

99%

(ix) – 1

   Alliant South Texas Pipeline, LP (**)

 (Also owned by Alliant Energy

 Field Services, LLC)

Energy

4/20/99

Texas

99%

(ix) – 1

   Alliant Energy Desdemona, LP (**)

 (Also owned by Alliant Energy

 Field Services, LLC)

Energy

2/14/00

Delaware

99%

(ix) – 1

   Bastian Bay Pipeline, LP (*) (**)

 (Also owned by Alliant Energy

 Field Services, LLC)

Energy

8/31/00

Texas

90%

(ix) – 1

   Alliant Energy Field Services, LLC

N/A

N/A

N/A

N/A

N/A

   Alliant South Texas Pipeline, LP (**)

 (Also owned by Industrial Energy

  Applications Delaware, Inc.)

Energy

4/20/99

Texas

99%

(ix) – 1

   Alliant Energy Desdemona, LP (**)

 (Also owned by Industrial Energy

  Applications Delaware, Inc.)

Energy

2/14/00

Delaware

99%

(ix) – 1

   Bastian Bay Pipeline, LP (*) (**)

 (Also owned by Industrial Energy

  Applications Delaware, Inc.)

Energy

8/31/00

Texas

90%

(ix) – 1

   NG Energy Trading, LLC (*) (**)

Energy

9/26/00

Oklahoma

50%

(v)

   Alliant Energy Investments, Inc.

N/A

N/A

N/A

N/A

N/A

   Heartland Energy Services, Inc.

N/A

N/A

N/A

N/A

N/A

   ReGENco LLC (**)

Energy

4/19/99

Wisconsin

30%

(vii) – 2

   Alliant Energy Transportation, Inc.

N/A

N/A

N/A

N/A

N/A

   Williams Bulk Transfer Inc. (**)

Energy

4/27/99

Iowa

100%

(ix) – 2

(a)

The following abbreviations were used:

Abbreviation

Nature of Business

(i)

Energy management services

(ii)

Development and commercialization of innovative electro technologies

(v)

Brokering and marketing of energy commodities – natural gas

(vi)

Production of alternative fuels

(vii) – 1

Environmental licensing, testing, and remediation services

(vii) – 2

Integrated turbine and generator services

(vii) – 3

Distribution system research and development

(vii) – 4

Transmission system maintenance and operations

(vii) – 5

Engineering and construction services

(ix) – 1

Fuel transportation facilities services

(ix) – 2

Fuel handling and storage facilities services

Company

Issuing

Security

Type of

Security

Issued

Principal

Amount of

Security

(in thousands)

Person to

Whom Security was Issued

(1)

ADI Thermal Power Corporation

Common stock

$200

Alliant Energy Resources, Inc.

Alliant Energy Desdemona, LP

Partnership capital

$678

Industrial Energy Applications Delaware, Inc.

Partnership capital

$1

Alliant Energy Field Services, LLC

Alliant South Texas Pipeline, LP

Partnership capital

$3,902

Industrial Energy Applications Delaware, Inc.

Partnership capital

$6

Alliant Energy Field Services, LLC

CellTech Power, Inc.

Series A preferred stock

$252

Alliant Energy Resources, Inc.

Dais Analytic Corporation

Common stock

$90

Wisconsin Power and Light Company

Distribution Vision 2010, LLC

Capital

$200

Alliant Energy Corporation

Heartland Energy Group, Inc.

Common stock

$5,011

Alliant Energy Integrated Services Company

Money pool borrowings

$1,413

Alliant Energy Resources, Inc.

Industrial Energy Applications, Inc.

Common stock

$21,060

Alliant Energy Integrated Services Company

Money pool borrowings

$17,506

Alliant Energy Resources, Inc.

New River Synfuel LLC

Capital

$84,488

Alpha Synfuel LLC

Nth Power Technologies Fund II, LP

Partnership capital

$8,900

Alliant Energy Resources, Inc.

Oak Hill Pipeline LP

Partnership capital

$849

Industrial Energy Applications Delaware, Inc.

ReGENco LLC

Class A units

$1,083

Heartland Energy Services, Inc.

Class B units

$167

Heartland Energy Services, Inc.

RMT, Inc. (2)

Common stock

$11,822

Alliant Energy Integrated Services Company

STM Power, Inc.

Series B preferred stock

$2,500

Alliant Energy Resources, Inc.

TRANSLink Development Company LLC

Capital

$288

Alliant Energy TransCo LLC

Loan

$2,149

Alliant Energy TransCo LLC

Williams Bulk Transfer Inc.

Common stock

$3,001

Alliant Energy Transportation, Inc.

Money pool borrowings

$1,402

Alliant Energy Resources, Inc.

Reporting

Company

Rendering

Services

Associate

Company

Receiving

Services

Types of

Services

Rendered

Direct

Costs

Charged

(in thousands)

Indirect

Costs

Charged

(in thousands)

Cost of

Capital

(in thousands)

Total

Amount

Billed

(in thousands)

RMT

WP&L

Environmental consulting

$795

$-

$-

$795

RMT

IEA

Environmental consulting

112

-

-

112

RMT

IP&L

Environmental consulting

122

-

-

122

RMT

AEG

Environmental consulting

1

-

-

1

RMT

Sheboygan

Environmental consulting

16

-

-

16

RMT

AE EPC

Environmental consulting

658

-

-

658

RMT

Neenah

Environmental consulting

13

-

-

13

ReGENco

WP&L

Integrated turbine & generator services

191

-

-

191

ReGENco

AEG

Storage lease, handling & maintenance

61

-

-

61

Associate

Company

Rendering

Services

Reporting

Company

Receiving

Services

Types of

Services

Rendered

Direct

Costs

Charged

(in thousands)

Indirect

Costs

Charged

(in thousands)

Cost of

Capital

(in thousands)

Total

Amount

Billed

(in thousands)

RMT

IEA

Environmental consulting

$112

$-

$-

$112

RMT

AE EPC

Environmental consulting

658

-

-

658

(a)

The following abbreviations were used:

Abbreviation

Legal Name

Abbreviation

Legal Name

AE EPC

Alliant Energy EPC, LLC

ReGENco

ReGENco LLC

AEG

Alliant Energy Generation, Inc.

RMT

RMT, Inc.

IEA

Industrial Energy Applications, Inc.

Sheboygan

Sheboygan Power, LLC

IP&L

Interstate Power and Light Company

WP&L

Wisconsin Power and Light Company

Neenah

Alliant Energy Neenah, LLC

Total consolidated capitalization as of September 30, 2005 (a)

$5,054,600

Line 1

Total capitalization multiplied by 15% (Line 1 multiplied by 0.15)

758,190

Line 2

Greater of $50 million or total capitalization multiplied by 15% (Line 2)

758,190

Line 3

Total current aggregate investment subsequent to April 21, 1998 (categorized by major line of energy-related business):

Energy-related business category i

-

Energy-related business category ii

13,042

Energy-related business category iii

-

Energy-related business category iv

-

Energy-related business category v

3,135

Energy-related business category vi

93,255

Energy-related business category vii

5,387

Energy-related business category viii

20,918 (b)

Energy-related business category ix

8,990

Energy-related business category x

-

Total current aggregate investment

____________________________

144,727

Line 4

Difference between the greater of $50 million or 15% of capitalization and the total aggregate investment of the registered holding company system

(Line 3 less Line 4)

$613,463

Line 5

Total current aggregate investment (categorized by major line of gas-related business):

Gas-related business category i

$-

Gas-related business category ii

-

____________________________________________

Total current aggregate investment

$-

Major Line Of

Energy-Related

Business

Other

Investment

In Last

U-9C-3

Report

Other

Investment

In This

U-9C-3 Report

Reason for Difference

In Other Investment

Energy-related business category i*

Industrial Energy Applications, Inc.

$39,044

$38,565

In the third quarter of 2005, Industrial Energy Applications, Inc. repaid $479 of money pool borrowings to Alliant Energy Resources, Inc.

Energy-related business category v*

Heartland Energy Group, Inc.

$3,289

$3,289

No change.

Energy-related business category vii*

RMT, Inc. (1)

$11,822

$11,822

No change.

Energy-related business category ix*

Oak Hill Pipeline LP

$849

$849

No change.

A.

FINANCIAL STATEMENTS:

B.

EXHIBITS:

1.

Exhibit A - Certificate of Alliant Energy Corporation

2.

Copies of contracts required by Item 3:

By: /s/ John E. Kratchmer                      

Vice President-Controller and Chief Accounting Officer

John E. Kratchmer

(Principal Accounting Officer)

By: /s/ John E. Kratchmer                      

Vice President-Controller and Chief Accounting Officer

John E. Kratchmer

(Principal Accounting Officer)