form11k123109.htm
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 11-K


[X]         ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2009

or

[  ]          TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934

For the transition period from _____________ to _____________

Commission File Number:  1-9894

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

ALLIANT ENERGY CORPORATION 401(k) SAVINGS PLAN

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

ALLIANT ENERGY CORPORATION
4902 North Biltmore Lane
Madison, Wisconsin 53718




REQUIRED INFORMATION

The following financial statements and schedules of the Alliant Energy Corporation 401(k) Savings Plan, prepared in accordance with the financial reporting requirements of the Employee Retirement Income Security Act of 1974, as amended, are filed herewith.














































Page 1 of 21 pages
Exhibit Index is on page 20
 
1
 



ALLIANT ENERGY CORPORATION

401(k) SAVINGS PLAN

FINANCIAL STATEMENTS AS OF DECEMBER 31, 2009 AND 2008

AND FOR THE YEAR ENDED DECEMBER 31, 2009,

SUPPLEMENTAL SCHEDULES AS OF AND FOR THE YEAR ENDED DECEMBER 31, 2009, AND

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
 
 

 2
 


 
ALLIANT ENERGY CORPORATION

401(k) SAVINGS PLAN


TABLE OF CONTENTS


 
 
Page No.
 
 
4
FINANCIAL STATEMENTS
 
 
 
 
5
 
6
     
 
7-15
SUPPLEMENTAL SCHEDULES
 
 
 
 
 
16
 
 
 
17
 
 
 
18
 
19
 
20
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
21
 
 
3


 
Report of Independent Registered Public Accounting Firm

To the Total Compensation Committee and Participants of the Alliant Energy Corporation 401(k) Savings Plan
Madison, Wisconsin

We have audited the accompanying statements of net assets available for benefits of Alliant Energy Corporation 401(k) Savings Plan (the "Plan") as of December 31, 2009 and 2008, and the related statement of changes in net assets available for benefits for the year ended December 31, 2009.  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 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, 2009 and 2008, and the changes in net assets available for benefits for the year ended December 31, 2009 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 schedules of (1) assets (held at end of year) as of December 31, 2009, and (2) assets (acquired and disposed of within year) for the year ended December 31, 2009, and (3) reportable transactions for the year ended December 31, 2009, are presented for the purpose of additional analysis and are not a required part of the basic financial statements, but are 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.  These schedules are the responsibility of the Plan's management.  Such schedules have been subjected to the auditing procedures applied in our audit of the basic 2009 financial statements and, in our opinion, are fairly stated in all material respects when considered in relation to the basic financial statements taken as a whole.
 

/s/ Deloitte & Touche LLP

Milwaukee, Wisconsin
June 24, 2010

4
 


 
 

 
             
401(k) SAVINGS PLAN
 
             
STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
 
             
             
   
December 31,
 
   
2009
   
2008
 
             
    Investments, other than participant promissory notes (Refer to Notes 7, 8 and 9)
  $ 572,303,167     $ 455,015,943  
    Participant promissory notes
    9,583,720       9,601,321  
        Total investments
    581,886,887       464,617,264  
                 
Net assets available for benefits at fair value
    581,886,887       464,617,264  
                 
    Adjustments from fair value to contract value for fully benefit-
               
     responsive investment contracts (Refer to Note 2)
    3,604,537       7,498,346  
                 
Net assets available for benefits
  $ 585,491,424     $ 472,115,610  
                 
                 
The accompanying Notes to Financial Statements are an integral part of these statements.
         
                 
                 
   
 
5
 


 

 
 
       
401(k) SAVINGS PLAN
 
       
STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
 
       
For the Year Ended December 31, 2009
 
       
       
Net assets available for benefits - beginning of year
  $ 472,115,610  
         
Contributions:
       
    Cash contributions from employees
    26,937,852  
    Employer contributions:
       
        Cash
    13,875,570  
        Cash for purchase of Alliant Energy Corporation common stock
    1,049,447  
    Rollovers from other qualified plans
    552,712  
         
Investment income:
       
    Net appreciation in fair value of investments (Refer to Note 7)
    94,402,345  
    Interest and dividends
    11,850,467  
         
Distributions to participants
    (35,292,579 )
         
  Net increase
    113,375,814  
         
Net assets available for benefits - end of year
  $ 585,491,424  
         
         
The accompanying Notes to Financial Statements are an integral part of this statement.
 
 
6
 


 
ALLIANT ENERGY CORPORATION
401(k) SAVINGS PLAN

NOTES TO FINANCIAL STATEMENTS
FOR THE YEAR ENDED DECEMBER 31, 2009
 
 Note 1.   Description of the Plan
 
The Alliant Energy Corporation 401(k) Savings Plan (the Plan) is a qualified defined contribution plan under Section 401(k) of the Internal Revenue Code (the Code), as amended, and meets the applicable requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA).  The following brief description of the Plan is provided for general information purposes only.  More complete information regarding the Plan is provided in the plan document and summary plan description, which have been made available to all eligible Plan participants (participants).  The Plan is administered by the Total Compensation Committee (the Committee) and the Plan sponsor is Alliant Energy Corporate Services, Inc. (a direct subsidiary of Alliant Energy Corporation).  The Committee reserves the right to terminate, amend or modify the Plan if future conditions warrant such action.

Any regular employee of Alliant Energy Corporation and its participating subsidiaries (the Company) age 18 and over may participate in the Plan.  Regular full-time employees and regular part-time employees customarily scheduled to work at least half-time may participate immediately following 30 days of service.  Part-time employees customarily scheduled to work less than half-time may participate after 12 months of service during which he or she has earned at least 1,000 paid hours.

An Employee Stock Ownership Plan (ESOP) is in place within the Plan. Under these provisions, participants have the option to elect to receive cash for any dividends paid on Company common stock within the Plan or to have the dividends reinvested in additional shares based on the current market price.

The Company provides matching contributions of $0.50 for each $1 contributed by the participant up to the first 8% of each respective participant's eligible compensation.  In addition, the Company provides a contribution into each active employee's 401(k) account each pay period based on a percentage of their base pay (non-elective Company cash contribution) as follows:

   
Company
Age plus Years of Service
 
Contribution
< 49
 
4%
50 - 69
 
5%
70+
 
6%

There are certain exceptions to the Company matching contributions and non-elective Company cash contributions described above for bargaining unit employees.  These exceptions are dependent on the bargaining unit in which the employee participates and the employee's date of hire.  These exceptions include certain employees being ineligible for the non-elective Company cash contribution and the Company matching contribution being limited to $0.50 for each $1 contributed by the participant up to the first 6% of each respective participant's eligible compensation. In addition, certain bargaining unit employees are eligible for a Company contribution of 1% of their respective eligible compensation (1% Company contribution).  This 1% Company contribution is in addition to any other Company provided match and will be invested in the Alliant Energy Corporation Common Stock Fund.  Participants must have at least three years of service before they can diversify investments from this 1% Company contribution to different investment funds.

 
7

 
Employee contribution limits for 2009 were as follows:

Eligible employee annual contribution limit as a percentage of compensation
50%
Maximum annual contribution limit*
$16,500
*Participants who were at least age 50 by Dec. 31, 2009 were eligible to make additional catch-up contributions of up to $5,500 in 2009.  These additional catch-up contributions were not eligible for any Company match.

Company matching contributions and the non-elective Company cash contributions are invested at each participant's discretion.  Participants may subsequently redesignate the distribution of future contributions or transfer existing balances between investment funds on a daily basis, subject to the limits set forth in the Plan.

Beginning June 21, 2009, the Company matching contribution for certain non-bargaining and bargaining employees was temporarily suspended.  The suspension did not apply to the non-elective Company cash contributions.  The Company resumed the matching contribution effective the first pay period of 2010.

An "additional" Company contribution is contributed to the accounts of active participants, as of the last day of the Plan year, who contributed at least the maximum level of their compensation eligible to be matched by the Company and did not receive the maximum level of Company matching contributions based on their contributions during the Plan year.  The amount of the "additional" Company contribution is the difference between the maximum level of Company matching contributions based on the participants contributions during the Plan year and the amount of Company matching contributions previously received by the participant during the Plan year.

Participants are immediately vested in their respective employee and employer contributions, except for the non-elective Company cash contribution which is subject to a three year cliff vesting schedule for new employees hired on Aug. 1, 2008 or later, or on a date agreed to pursuant to the terms of the participant's respective bargaining agreement.  At Dec. 31, 2009 and 2008, forfeited nonvested accounts totaled $38,816 and $0, respectively.  These accounts will be used to reduce future employer contributions.  During the year ended Dec. 31, 2009, employer contributions were reduced by $0 from forfeited nonvested accounts.

Contributions under the Plan are held and invested, until distribution, in a Trust Fund maintained by J.P. Morgan Retirement Plan Services LLC (the Trustee or JPMorgan).  Individual accounts are maintained by the Trustee for each participant.  Each participant's account is credited with the participant's contributions, Company contributions, and an allocation of Plan earnings, and charged with withdrawals and an allocation of Plan losses and administrative expenses.  Allocations are based on participant earnings or account balances, as defined.  The benefit to which a participant is entitled is the benefit that can be provided from the participant's vested account balance.

The Plan has provisions under which participants who are active employees may take loans up to the lesser of $50,000 or 50% of their total account balance (a $1,000 minimum loan amount and a maximum of three loans for each participant also apply).  The Committee determines the loan interest rate pursuant to the Plan.  Interest rates on participant loans outstanding ranged from 4.25% to 10.5% and 5.0% to 10.5% at Dec. 31, 2009 and 2008, respectively.  Principal and interest are repaid bi-weekly through employee payroll deductions.

8
 



Note 2.
Summary of Significant Accounting Policies

(a) Basis of Accounting - The financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP).

(b) New Accounting Pronouncements - In September 2009, the Financial Accounting Standards Board issued authoritative guidance which expands the required disclosures for certain investments with a reported net asset value (NAV).  The guidance permits an entity holding investments in certain entities that calculate net asset value per share or its equivalent for which the fair value is not readily determinable, to measure the fair value of such investments on the basis of that net asset value per share or its equivalent without adjustment.  The guidance requires enhanced disclosures about the nature and risks of investments, including the nature of any restrictions on an investor's ability to redeem its investments at the measurement date, any unfunded commitments and the investment strategies of the investee.  The Plan adopted this guidance on a prospective basis for the year ended Dec. 31, 2009 with no material impact on the fair value determination and disclosure of applicable investments.  Refer to Note 8 for disclosures about fair value measurements.

In January 2010, the Financial Accounting Standards Board issued authoritative guidance which adds new fair value measurement disclosure requirements for Level 1 and 2 measurements, separate disclosures of purchases, sales, issuances and settlements relating to Level 3 measurements and clarification of existing fair value disclosures.  The guidance is effective for periods beginning after Dec. 31, 2009, except for the requirement to provide Level 3 activity of purchases, sales, issuances and settlements on a gross basis, which will be effective for fiscal years beginning after Dec. 31, 2010.  The Plan is currently evaluating the impact this guidance will have on the financial statements of the Plan.

(c) Accounting for Fully Benefit-Responsive Contracts - In accordance with Financial Accounting Standards Board authoritative guidance which defines reporting of fully benefit-responsive contracts held by defined-contribution pension plans, the statements of net assets available for benefits present investments at fair value as well as an additional line item showing an adjustment of fully benefit-responsive contracts from fair value to contract value.
 
 
(d) Valuation of Investments and Income Recognition - The Plan's investments are stated at fair value.  All Guaranteed Investment Contracts (GICs) held by the Plan are fully benefit-responsive contracts and at Dec. 31, 2009 and 2008 all were synthetic GICs.  The synthetic GICs are comprised of a portfolio of bonds and other fixed income securities owned by the Plan and an investment contract issued by an insurance company or other financial institution, designed to provide a contract value "wrapper" around the fixed income portfolio to guarantee a specific interest rate.  The contract value of all GIC investments was $67,122,958 and $65,386,614 at Dec. 31, 2009 and 2008, respectively.  The approximate fair value of these investments was $63,518,421 and $57,888,268 at Dec. 31, 2009 and 2008, respectively, based on the fair value of the underlying assets.  The weighted average yields for the GICs based on annualized earnings on Dec. 31, 2009 and 2008 were 4.12% and 6.43%, respectively.  The weighted average yields for the GICs based on the interest rate credited to participants on Dec. 31, 2009 and 2008 were 2.48% and 3.44%, respectively.  Participant loans are carried at unpaid principal balances due, which approximates fair value.  All other Plan investments are carried at fair value as determined by quoted market prices or the net asset value of shares held by the Plan on the valuation date.  Interest income is accrued when earned.  Dividend income is recorded on the ex-dividend date.  Investment transactions are recorded on the trade date.

(e) Net Appreciation in Fair Value of Investments - Net realized and unrealized appreciation is recorded in the accompanying statement of changes in net assets available for benefits as "Net appreciation in fair value of investments."

(f) Payment of Benefits - Benefit payments to participants are recorded when paid.
 
9




(g) Expenses - All expenses paid through the Plan are recorded with investment earnings in the accompanying statement of changes in net assets available for benefits.  On JPMorgan individual participant statements, recordkeeping fees are reported separate from investment earnings and are paid for directly by the Plan participants.  Investment management fees are paid from investment earnings prior to crediting earnings to the individual participant account balances, but can be identified in the investment fund information supplied to participants from JPMorgan.  Certain other Plan administrative expenses are absorbed by the Company.  Expenses incurred in maintaining Self-Managed Brokerage Accounts are the responsibility of the respective Plan participants.

(h) Use of Estimates - The preparation of financial statements in conformity with GAAP requires the Plan administrator to make estimates and assumptions that affect the reported amounts of net assets available for benefits at the date of the financial statements and the reported amounts of changes in net assets available for benefits during the reporting period.  Actual results could differ from those estimates.

(i) Risk and Uncertainties - The Plan invests in various investments, including registered investment companies, common/collective trusts, common stock of the Company and synthetic investment contracts.  The Plan also offers a Self-Managed Brokerage Account option which allows participants to invest in a wide range of mutual funds.  Investments, 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 investments, it is reasonably possible that changes in the values of certain investments may occur in the near term and that such changes could materially affect the amounts reported in the financial statements.                 
 
 Note 3.  Tax Status
 
The Internal Revenue Service has determined and informed the Company by a letter dated Aug. 25, 2003, that the Plan and related trust are designed in accordance with the applicable sections of the Code.  The Plan has been amended since receiving the determination letter.  However, the Committee and the Plan's tax counsel believe that the Plan is designed and is currently being operated in compliance with the applicable requirements of the Code.
 
 Note 4.   Plan Termination Provisions
 
Upon termination of the Plan in its entirety, each participant is entitled to receive, in accordance with the terms of the Plan, the entire balance in their account.  The Company has no intention to terminate the Plan.
 
 Note 5.   Withdrawals and Distributions
 
Withdrawals from participants' account balances are allowed when participants who are actively employed reach age 70-1/2 (or age 59-1/2 for certain participants).  Withdrawals are also allowed due to special "hardship" circumstances.  Distributions from the Plan will be made upon termination of employment (by retirement, death, disability or otherwise) if the participant's account balance is less than $5,000.  If a withdrawing participant's account balance exceeds $1,000 but is less than $5,000, and the participant does not make an election to either have the account paid as a direct rollover or as a cash payment, the distribution will be paid as a direct rollover to an individual retirement account established at the Trustee.  If a withdrawing participant's account balance exceeds $5,000, the participant may elect to defer payment until he or she is age 70-1/2.  Distributions can be either in the form of a lump sum or substantially equal annual installments.  The unpaid portion of all loans made to the participant, including accrued interest, will be deducted from the amount of the participant account to be distributed. Distributions payable to participants at Dec. 31, 2009 and 2008 were $0.  Distributions payable are not included as a liability within net assets available for benefits in the accompanying financial statements, however, they are recorded as liabilities in the Plan's Form 5500.      
 
 Note 6.   Derivative Financial Instruments
 
The Plan did not invest in any material derivative financial instruments during 2009 and 2008.

10
 


 

Note 7.
Investment Information

Investments held which were greater than 5% of the Plan's net assets available for benefits as of Dec. 31 were as follows:
 
2009
 
2008
American Funds Growth Fund of America, 2,944,334 class R6 and
     
2,896,125 class R5 shares, respectively
$80,468,640  
 
$59,196,798  
Alliant Energy Corporation Common Stock*
78,845,246  
 
85,716,240  
(non-participant directed: $35,730 (1,181 shares) and
     
$18,486 (633 shares), respectively)
     
(participant directed: $78,809,516 (2,604,412 shares) and $85,697,754
     
(2,936,870 shares), respectively)
     
State Street Global Advisors S&P 500 Index Securities Lending Series Fund,
     
(f/k/a State Street Global Advisors S&P 500 Index Fund),
     
3,447,604 class II and 3,039,432 class C shares, respectively
72,392,795  
 
50,396,823  
American Funds EuroPacific Growth Fund, 1,674,252 class R6 and
     
1,508,183 class R5 shares, respectively
64,190,817  
 
42,153,705  
JPMorgan Intermediate Bond Fund*, 4,798,341 and 4,813,223 shares,
     
respectively
60,075,229  
 
54,389,421  
PIMCO Total Return Fund, 5,292,023 and 4,527,981 class I shares, respectively
57,153,844  
 
45,913,730  
Dodge & Cox Stock Fund, 478,394 and 459,687 shares, respectively
45,992,847  
 
34,186,912  
* Represents party known to be a party-in-interest to the Plan.

During 2009, the Plan's investments, including gains and losses on investments acquired and disposed of, as well as held during the year, appreciated in value as follows:

American Funds Growth Fund of America
$19,933,546
   
American Funds EuroPacific Growth Fund
16,434,186
   
State Street Global Advisors S&P 500 Index Securities Lending Series Fund
     
(f/k/a State Street Global Advisors S&P 500 Index Fund)
15,061,826
   
Dodge & Cox Stock Fund
10,317,994
   
Boston Company Emerging Markets Value Equity Fund
9,884,223
   
Buffalo Small Cap Fund
6,854,511
   
PIMCO Total Return Fund
3,634,218
   
Riversource Small Cap Value Fund
3,226,775
   
Wellington Mid Cap Growth Fund
3,136,306
   
Perkins Mid Cap Value Fund
1,974,817
   
Alliant Energy Corporation Common Stock*
1,676,498
   
State Street Global Advisors U.S. Bond Index Securities Lending Series Fund
     
(f/k/a State Street Global Advisors Bond Index Fund)
1,527,008
   
Janus Advisor Mid Cap Value Fund
417,221
   
Self-Managed Brokerage Accounts
323,216
   
Net appreciation in fair value of investments
$94,402,345
   
* Represents party known to be a party-in-interest to the Plan.

11
 

 
 
 Note 8.   Fair Value Measurements
 
Valuation Hierarchy - Fair value measurement accounting establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value.  The three levels of the fair value hierarchy and a description of the Plan's assets for each are as follows:

Level 1 - Pricing inputs are unadjusted quoted prices available in active markets for identical assets or liabilities as of the reporting date.  Level 1 Plan assets include investments in registered investment companies and common stocks and are valued at the closing price reported in the active market in which the individual securities are traded.  Assets of participant-directed brokerage accounts at Dec. 31, 2009 and 2008 were limited to investments in registered investment companies.

Level 2 - Pricing inputs are quoted prices for similar asset or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means.  Level 2 Plan assets include investments in common/collective trusts, corporate bonds and government and agency obligations.  Common/collective trusts are valued at the net asset value (NAV) of shares held by the Plan which is based on the fair market value of the underlying investments of the common/collective trusts.  The common/collective trusts underlying assets primarily consist of traded securities that have a variety of investment strategies including domestic and international equity and fixed income funds.  Corporate bonds and government and agency obligations are valued at the closing price reported in the active market in which the individual securities are traded or based on yields currently available on comparable securities of issuers with similar credit ratings.

Level 3 - Pricing inputs are unobservable inputs for assets or liabilities for which little or no market data exist and require significant management judgment or estimation.  Level 3 Plan assets include synthetic guaranteed investment contract wrappers and participant promissory notes.  Synthetic guaranteed investment contract wrappers are valued at fair value by discounting the related cash flows based on current yields of similar instruments with comparable durations considering the credit-worthiness of the issuer.  The fair value of all synthetic guaranteed investment contract wrappers was $0 and $130,687 at Dec. 31, 2009 and 2008, respectively.  Participant promissory notes are valued at amortized cost, which approximates fair value.

The fair value hierarchy gives the highest priority to unadjusted quoted prices in active markets (Level 1) and the lowest priority to unobservable data (Level 3).  In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy.  The lowest level input that is significant to a fair value measurement in its entirety determines the applicable level in the fair value hierarchy.  Assessing the significance of a particular input to the fair value measurement in its entirety requires judgment, considering factors specific to the asset or liability.

The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values.  Furthermore, while the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.
 
12



Recurring Fair Value Measurements - The Plan's recurring items subject to fair value measurements disclosure requirements at Dec. 31, 2009 and 2008 were as follows:

 
Fair Value
           
 
Measurements
 
Level 1
 
Level 2
 
Level 3
Assets at Dec. 31, 2009:
             
Registered investment companies:
             
U.S. large cap value
$45,992,847
 
$45,992,847
 
$--
 
$--
U.S. large cap growth
80,468,640
 
80,468,640
 
--
 
--
U.S. mid cap value
9,796,860
 
9,796,860
 
--
 
--
U.S. small cap value
10,138,261
 
10,138,261
 
--
 
--
U.S. small cap growth
25,143,157
 
25,143,157
 
--
 
--
International - developed markets
64,190,817
 
64,190,817
 
--
 
--
Fixed income funds
57,153,844
 
57,153,844
 
--
 
--
Common/collective trusts:
             
U.S. large cap core
72,392,795
 
--
 
72,392,795
 
--
U.S. mid cap growth
9,142,062
 
--
 
9,142,062
 
--
International - emerging markets
22,189,216
 
--
 
22,189,216
 
--
Fixed income funds
88,769,442
 
--
 
88,769,442
 
--
Liquidity funds
4,283,346
 
--
 
4,283,346
 
--
Common stocks
78,845,246
 
78,845,246
 
--
 
--
Government and agency obligations
2,306,801
 
--
 
2,306,801
 
--
Participant-directed brokerage accounts
1,489,833
 
1,489,833
 
--
 
--
Participant promissory notes
9,583,720
 
--
 
--
 
9,583,720
Total assets at fair value
$581,886,887
 
$373,219,505
 
$199,083,662
 
$9,583,720
Assets at Dec. 31, 2008:
             
Registered investment companies:
             
U.S. large cap value
$34,186,912
 
$34,186,912
 
$--
 
$--
U.S. large cap growth
59,196,798
 
59,196,798
 
--
 
--
U.S. mid cap value
8,545,394
 
8,545,394
 
--
 
--
U.S. small cap value
6,365,095
 
6,365,095
 
--
 
--
U.S. small cap growth
18,631,204
 
18,631,204
 
--
 
--
International - developed markets
42,153,705
 
42,153,705
 
--
 
--
               Fixed income funds 45,913,730   45,913,730   --    --
Common/collective trusts:
             
U.S. large cap core
50,396,823
 
--
 
50,396,823
 
--
U.S. mid cap growth
5,065,249
 
--
 
5,065,249
 
--
International - emerging markets
12,816,789
 
--
 
12,816,789
 
--
Fixed income funds
75,674,155
 
--
 
75,674,155
 
--
Liquidity funds
6,334,864
 
--
 
6,334,864
 
--
Common stocks
85,716,240
 
85,716,240
 
--
 
--
Corporate bonds
223,572
 
--
 
223,572
 
--
Government and agency obligations
2,751,656
 
--
 
2,751,656
 
--
Synthetic guaranteed investment
             
contract wrappers
130,687
 
--
 
--
 
130,687
Participant-directed brokerage accounts
913,070
 
913,070
 
--
 
--
Participant promissory notes
9,601,321
 
--
 
--
 
9,601,321
Total assets at fair value
$464,617,264
 
$301,622,148
 
$153,263,108
 
$9,732,008

13
 


Additional information for the Plan's recurring fair value measurements using significant unobservable inputs (Level 3 inputs) for 2009 is as follows:
 
 
Synthetic Guaranteed
 
Participant
 
Investment Contract
 
Promissory
 
Wrappers
 
Notes
Beginning balance, Jan. 1, 2009
$130,687 
 
$9,601,321 
Unrealized losses relating to instruments still held at Dec. 31, 2009
(130,687)
 
--  
Purchases, sales, issuances and settlements, net
             --  
 
      (17,601)
 
Ending balance, Dec. 31, 2009
$           --  
 
$9,583,720 
 
 Note 9.   Non-Participant Directed Investments
 
Information about the net assets and the significant components of the changes in net assets relating to the non-participant directed investments was as follows:
   
Dec. 31,
 
Net assets:
2009
 
2008
 
Alliant Energy Corporation Common Stock*
$35,730 
 
$18,486
         
 
Changes in net assets:
2009
   
 
Employer contributions
$30,597 
     
         
 
Investment activity:
     
 
Net appreciation in fair value of investments
    6,287 
   
 
Investment income
    1,511 
   
         
 
Transfers to participant directed investments (Note 1)
 (18,981)
   
 
Distributions to participants
   (2,170)
   
   
$17,244 
      
   * Represents party known to be a party-in-interest to the Plan.      
   
 Note 10.  Related Party Transactions
 
Certain Plan investments are shares of common trust funds managed by an affiliate of the Trustee and shares of common stock of the Company.  As of Dec. 31, 2009 and 2008, the Plan held 2,605,593 and 2,937,503 shares of Alliant Energy Corporation common stock with a cost basis of $73,850,129 and $84,587,117 respectively.  In 2009 and 2008, the Plan recorded dividend income of $4,217,608 and $4,380,118 respectively, from investments in common stock of the Company.  These transactions qualify as exempt party-in-interest transactions.
 
14
 

 
 Note 11.   Reconciliation to Form 5500
 
Net assets available for benefits in the accompanying financial statements are at contract value, however, they are recorded at fair value in the Plan's Form 5500.  If applicable, distributions payable to participants are not included as a liability within net assets available for benefits in the accompanying financial statements, however, they are recorded as liabilities in the Plan's Form 5500.  The following table reconciles net assets available for benefits per the financial statements to the Plan's Form 5500 as filed by the Company:
   
2009
 
2008
 
Net assets available for benefits per financial statements
$585,491,424 
 
$472,115,610 
 
Adjustments:
     
 
Fair value to contract value for fully
     
 
benefit-responsive investment contracts
(3,604,537)
 
(7,498,346)
        Deemed distributions of participant loans (4,378)   -- 
 
Amounts reported per Form 5500
$581,882,509 
 
$464,617,264 

The following table reconciles the net increase in net assets available for benefits per the financial statements to the Form 5500 as filed by the Company for 2009:

   
Net increase
 
Amounts reported per financial statements
$113,375,814 
 
Adjustments:
 
 
Changes in adjustment from fair value to contract value
 
 
for fully benefit-responsive investment contracts
3,893,809 
        Deemed distributions of participant loans (4,378)
 
Amounts reported per Form 5500
$117,265,245 

15


 
 
 
             
401(k) SAVINGS PLAN
             
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
             
AS OF DECEMBER 31, 2009
             
Identity of issue, borrower,
 
Description of investment including maturity date,
     
Current
lessor, or similar party
 
rate of interest, collateral, par or maturity value
 
Cost*
 
Value
Registered Investment Companies
American Funds Growth Fund of America, 2,944,334 class R6 shares
 
$80,468,640
   
American Funds EuroPacific Growth Fund, 1,674,252 class R6 shares
 
64,190,817
   
PIMCO Total Return Fund, 5,292,023 class I shares
     
57,153,844
   
Dodge & Cox Stock Fund, 478,394 shares
     
45,992,847
   
Buffalo Small Cap Fund, 1,118,468 shares
     
25,143,157
   
Riversource Small Cap Value Fund, 2,161,676 class R5 shares
 
10,138,261
   
Perkins Mid Cap Value Fund, 494,791 class I shares
     
9,796,860
             
Common/Collective Trusts
 
State Street Global Advisors S&P 500 Index Securities Lending Series Fund, 3,447,604 class II shares
   
     (f/k/a State Street Global Advisors S&P 500 Index Fund, class C shares)
72,392,795
   
JPMorgan Intermediate Bond Fund**, 4,798,341 shares
     
60,075,229
   
State Street Global Advisors U.S. Bond Index Securities Lending Series Fund, 2,150,990 class II shares
   
     (f/k/a State Street Global Advisors Bond Index Fund, class L shares)
 
28,694,213
   
Boston Company Emerging Markets Value Equity Fund, 395,071 shares
 
22,189,216
   
Wellington Mid Cap Growth Fund, 899,809 shares
     
9,142,062
   
JPMorgan Liquidity Fund**, 4,283,346 shares
     
4,283,346
             
Corporate Stocks:  Common
 
Alliant Energy Corporation common stock**, 2,605,593 shares
$73,850,129
 
78,845,246
             
Government and Agency Obligations
US TREASURY NOTE 4.750%, 08/15/17, par value $610,000
 
661,898
   
FHLMC 30 YR FH 1G2450 Mtg Back FRN 8/1/36, par value $220,146
 
233,202
   
FNMA 10 YR FN 387608 Mtg Back 4.80%, 9/1/15, par value $206,967
 
216,475
   
FNMA 30 YR FN 826908 Mtg Back FRN, 8/1/35, par value $127,741
 
134,980
   
FNMA 30 YR FN 866097 Mtg Back FRN, 2/1/36, par value $107,787
 
113,165
   
FNMA 30 YR FN 887096 Mtg Back FRN, 7/1/36, par value $100,320
 
106,155
   
FNMA 30 YR FN 844705 Mtg Back FRN, 12/1/35, par value $74,260
 
78,991
   
FNMA 30 YR FN 705304 Mtg Back FRN, 6/1/33, par value $74,379
 
78,715
   
FNMA 30 YR FN 725090 Mtg Back FRN, 11/1/33, par value $72,839
 
77,159
   
US TREASURY NOTE 2.000%, 09/30/10, par value $75,000
   
75,891
   
FNMA 30 YR FN 902818 Mtg Back FRN, 11/1/36, par value $71,283
 
75,602
   
FNMA 30 YR FN 849082 Mtg Back FRN, 1/1/36, par value $65,056
 
68,812
   
FNMA 30 YR FN 809534 Mtg Back FRN, 2/1/35, par value $58,843
 
61,842
   
FNMA 30 YR FN 799769 Mtg Back FRN, 11/1/34, par value $54,502
 
57,129
   
FNMA 30 YR FN 764082 Mtg Back FRN, 1/1/34, par value $50,698
 
52,242
   
FNMA 30 YR FN 801344 Mtg Back FRN, 10/1/34, par value $46,904
 
48,135
   
FNMA 30 YR FN 872753 Mtg Back FRN, 6/1/36, par value $42,853
 
45,305
   
US TREASURY NOTE 2.375%, 08/31/10, par value $35,000
   
35,463
   
US TREASURY NOTE 2.000%, 02/28/10, par value $25,000
   
25,071
   
US TREASURY NOTE 1.500%, 10/31/10, par value $20,000
   
20,177
   
US TREASURY NOTE 2.875%, 06/30/10, par value $15,000
   
15,196
   
US TREASURY NOTE 2.125%, 04/30/10, par value $15,000
   
15,097
   
US TREASURY NOTE 2.625%, 05/31/10, par value $10,000
   
10,099
             
Investment Contracts
 
State Street Bank, 2.45%
       
   
     Synthetic Guaranteed Investment Contract Wrapper
     
--
   
Aegon, 2.45%
       
   
     Synthetic Guaranteed Investment Contract Wrapper
     
--
   
ING, 2.45%
       
   
     Synthetic Guaranteed Investment Contract Wrapper
     
--
             
Participant-Directed Brokerage Accounts
Self-Managed Brokerage Accounts
     
1,489,833
             
Participant Promissory Notes**
Maximum allowable loan per participant -- $50,000
       
   
Various interest rates -- 4.25% to 10.50%
       
   
Primarily maturing within 5 years
     
9,583,720
           
$581,886,887
             
*     Cost value is not required to be disclosed for participant-directed investments.
       
**   Represents party known to be a party-in-interest to the Alliant Energy Corporation 401(k) Savings Plan.
 
 
16
 
 

 

 
               
401(k) SAVINGS PLAN
 
               
FORM 5500, SCHEDULE H, PART IV, LINE 4i - SCHEDULE OF ASSETS (ACQUIRED AND DISPOSED OF WITHIN YEAR)
               
FOR THE YEAR ENDED DECEMBER 31, 2009
 
               
   
Description of investment
         
Identity
 
including maturity date,
         
of issue, borrower, lessor,
 
rate of interest, collateral,
 
Cost of
 
Proceeds of
 
or similar party
 
par or maturity value
 
Acquisitions
 
Dispositions
 
               
None.
             
 
17
 
 


             
401(k) SAVINGS PLAN
             
FORM 5500, SCHEDULE H, PART IV
             
LINE 4j - SCHEDULE OF REPORTABLE TRANSACTIONS
             
FOR THE YEAR ENDED DECEMBER 31, 2009
             
             
Identity
Total
Total
Total
Net
Adjusted
Net
of Party Involved and
Number of
Value of
Number
Selling
Cost of
Gain
Description of Assets
Purchases
Purchases
of Sales
Price
Assets Sold
(Loss)
             
             
Single Transaction Exceeds 5% of Value:
           
             
None.
           
                        
             
Series of Transactions With Same Broker Exceeds 5% of Value:
       
             
None.
           
             
             
Series of Transactions In Same Security Exceeds 5% of Value:
       
             
None.
           
             
             
Single Transaction With One Broker Exceeds 5% of Value:
         
             
None.
           
             

 
18
 
 


 
SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Total Compensation Committee, which administers the Plan, has duly caused this Annual Report to be signed on its behalf by the undersigned, thereunto duly authorized, on this 24th day of June 2010.


 
ALLIANT ENERGY CORPORATION
 
401(k) SAVINGS PLAN
   
 
/s/  Wayne A. Reschke
 
Wayne A. Reschke
   
 
The foregoing person is the Vice President - Human
 
Resources of Alliant Energy Corporation and
 
Alliant Energy Corporate Services, Inc., and the
 
Chairperson of the Alliant Energy Corporation Total
 
Compensation Committee.
   


19
 
 


EXHIBIT INDEX TO ANNUAL REPORT ON FORM 11-K


ALLIANT ENERGY CORPORATION
401(k) SAVINGS PLAN

FOR THE YEAR ENDED DECEMBER 31, 2009




   
Page Number in
   
Sequentially Numbered
Exhibit No.
Exhibit
Form 11-K
23
Consent of Independent Registered Public Accounting Firm
21
 
 

20