S-8

As filed with the Securities and Exchange Commission on May 5, 2016

Registration No. 333-___________

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S‑8

REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933

ALLIANT ENERGY CORPORATION

(Exact name of registrant as specified in its charter)

Wisconsin	39-1380265
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
4902 North Biltmore Lane Madison, Wisconsin	53718
(Address of principal executive offices)	(Zip Code)

Alliant Energy Corporation 401(k) Savings Plan

(Full title of the plan)

James H. Gallegos Senior Vice President, General Counsel and Corporate Secretary Alliant Energy Corporation 4902 North Biltmore Lane Madison, Wisconsin 53718 (608) 458-3311	Copy to: Andrew B. Moore Perkins Coie LLP 1201 Third Avenue, Suite 4900 Seattle, Washington 98101-3099 (206) 359-8000
(Name, address and telephone number, including area code, of agent for service)

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	x		Accelerated filer	¨
Non-accelerated filer	¨	(Do not check if a smaller reporting company)	Smaller reporting company	¨

CALCULATION OF REGISTRATION FEE

Title of securities to be registered(1)	Amount to be registered (2)	Proposed maximum offering price per share (3)	Proposed maximum aggregate offering price (3)	Amount of registration fee
Common Stock, $.01 par value	1,000,000	$34.90	$34,900,000	$3,514.43

(1) Each share of Common Stock has attached thereto one Common Share Purchase Right (the “Rights”). Prior to the occurrence of certain events, these Rights will not be exercisable or evidenced separable from the Common Stock. No separate consideration will be payable for the Rights.

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(2) Shares registered reflect effectiveness of Alliant Energy Corporation’s two-for-one stock split, effective at the close of business on May 4, 2016 (the “Stock Split”). Pursuant to Rule 416(a) under the Securities Act of 1933, as amended (the “Securities Act”), this Registration Statement of Alliant Energy Corporation also covers such additional securities to be offered or issued from time to time in connection with future stock splits, stock dividends or similar transactions.

(3) Estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(c) and Rule 457(h)(1) of the Securities Act. The Common Stock has not yet begun trading on the New York Stock Exchange on a post-Stock Split basis, but the shares are being registered on this Registration Statement on a post-Stock Split basis. The proposed maximum offering price per share is based on the average of the high sales price and the low sales price for the Common Stock as reported by the New York Stock Exchange on April 29, 2016, and has been adjusted to proportionately reflect the Stock Split effective May 4, 2016.

In addition, pursuant to Rule 416(c) under the Securities Act, this Registration Statement also covers an indeterminate amount of interests to be offered or sold pursuant to the employee benefit plan described herein. Pursuant to Rule 457(h)(2) under the Securities Act, no separate registration fee is required with respect to such interests.

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PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.    Incorporation of Documents by Reference.

The following documents filed by Alliant Energy Corporation (the “Company”) with the Securities and Exchange Commission (the “SEC”) (SEC File No. 1-9894) are hereby incorporated by reference into this Registration Statement (except for the portions of Current Reports on Form 8-K furnished pursuant to Item 2.02 or Item 7.01 thereof, and any associated exhibits furnished pursuant to Item 9.01 thereof, or otherwise not filed with the SEC, which are deemed not to be incorporated by reference into this Registration Statement):

(a)    the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015, filed on February 24, 2016, which contains the audited financial statements of the Company for the latest fiscal year for which such statements have been filed;

(b)    the 401(k) Savings Plan’s Annual Report on Form 11-K for the fiscal year ended December 31, 2014, filed on June 24, 2015;

(c)    the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2016, filed on May 5, 2016;

(d)    the description of the Common Stock contained in the Company’s Registration Statement on Form 8-B, dated April 1, 1988, pursuant to Section 12(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), including any amendment or report filed for the purpose of updating such description; and

(e)     the description of the Rights contained in the Company’s Registration Statement on Form 8-A, dated January 20, 1999, as amended by Amendment No. 1 on Form 8-A/A, dated December 11, 2008, pursuant to Section 12(b) of the Exchange Act, including any amendment or report filed for the purpose of updating such description.

All documents filed by the Company pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date hereof (excluding any documents or portions of such documents that are furnished pursuant to Item 2.02 or Item 7.01 of a current report on Form 8-K, and any associated exhibits furnished pursuant to Item 9.01 thereof, or otherwise not filed with the SEC), and prior to the filing of a post-effective amendment that indicates that all the securities offered hereby have been sold or that deregisters the securities offered hereby then remaining unsold, shall also be deemed to be incorporated herein by reference and to be a part hereof from the date of filing of such documents.

Any statement contained herein or in a document incorporated or deemed to be incorporated by reference herein will be deemed to be modified or superseded to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes that statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.

Item 4.    Description of Securities.

Not applicable.

Item 5.    Interests of Named Experts and Counsel.

None.

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Item 6.    Indemnification of Directors and Officers.

Pursuant to the provisions of the Wisconsin Business Corporation Law (“WBCL”) and Article VIII of the Company’s Restated Bylaws, directors and officers of the Company are entitled to mandatory indemnification from the Company against certain liabilities (which may include liabilities under the Securities Act) and expenses (i) to the extent such officers or directors are successful in the defense of a proceeding; and (ii) in proceedings in which the director or officer is not successful in defense thereof, unless it is determined that the director or officer breached or failed to perform his or her duties to the Company and such breach or failure constituted: (a) a willful failure to deal fairly with the Company or its shareowners in connection with a matter in which the director or officer had a material conflict of interest; (b) a violation of criminal law unless the director or officer had a reasonable cause to believe his or her conduct was lawful or had no reasonable cause to believe his or her conduct was unlawful; (c) a transaction from which the director or officer derived an improper personal profit; or (d) willful misconduct. Additionally, under the WBCL, directors of the Company are not subject to personal liability to the Company, its shareowners or any person asserting rights on behalf thereof, for certain breaches or failures to perform any duty resulting solely from their status as directors, except in circumstances paralleling those outlined in (a) though (d) above.

The indemnification provided by the WBCL and the Company’s Restated Bylaws is not exclusive of any other rights to which a director or officer of the Company may be entitled. The Company also carries directors’ and officers’ liability insurance.

Item 7.    Exemption from Registration Claimed.

Not applicable.

Item 8.    Exhibits.

Exhibit Number	Description of Document
4.1*	Amended and Restated Rights Agreement, dated as of December 11, 2008, between the Company and Wells Fargo Bank, N.A. (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form 8-A/A, dated December 11, 2008 (SEC File No. 1-9894))
5.1+	Opinion of Perkins Coie LLP
23.1+	Consent of Deloitte & Touche LLP, independent registered public accounting firm for the Company
23.2+	Consent of Perkins Coie LLP (included in opinion filed as Exhibit 5.1)
24.1+	Power of Attorney (see signature page)
99.1*	Alliant Energy Corporation 401(k) Savings Plan (incorporated by reference to Exhibit 99.1 to the Company's Post-Effective Amendment No. 1 to Form S-8 Registration Statement, dated May 5, 2016 (SEC File No. 333-117654))

+ Filed herewith.

* Incorporated herein by reference.

The Company hereby undertakes that it has submitted or will submit the 401(k) Savings Plan, and any amendments thereto, to the Internal Revenue Service (“IRS”) in a timely manner and has made or will make all changes required by the IRS in order to continue the qualification of the 401(k) Savings Plan under Section 401 of the Internal Revenue Code of 1986, as amended.

Item 9.    Undertakings.

A.    The undersigned Registrant hereby undertakes:

(1)    To file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement:

(a)    To include any prospectus required by Section 10(a)(3) of the Securities Act;

(b)    To reflect in the prospectus any facts or events arising after the effective date of this Registration Statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in this Registration Statement; and

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(c)    To include any material information with respect to the plan of distribution not previously disclosed in this Registration Statement or any material change to such information in this Registration Statement;

provided, however, that paragraphs (1)(a) and (1)(b) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SEC by the Registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by reference in this Registration Statement.

(2)    That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3)    To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

B.    The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the Registrant’s annual report pursuant to Section 13(a) or 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in this Registration Statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

C.    Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that, in the opinion of the SEC, such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Madison, State of Wisconsin, on May 5, 2016.

ALLIANT ENERGY CORPORATION

By:/s/ Patricia L. Kampling

Patricia L. Kampling

Chief Executive Officer

POWER OF ATTORNEY

Each person whose signature appears below constitutes and appoints Patricia L. Kampling and James H. Gallegos, or either of them, as his or her attorneys-in-fact, with the power of substitution, for him or her in any and all capacities, to sign any amendments to the Registration Statement, and to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that said attorneys-in-fact, or their substitute or substitutes, may do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities indicated below on May 5, 2016.

Signature		Title
/s/	Patricia L. Kampling	Chairman, Chief Executive Officer and Director (Principal Executive Officer)
	Patricia L. Kampling
/s/	Thomas L. Hanson	Senior Vice President and Chief Financial Officer (Principal Financial Officer)
	Thomas L. Hanson
/s/	Robert J. Durian	Vice President, Chief Accounting Officer and Controller (Principal Accounting Officer)
	Robert J. Durian

/s/	Patrick E. Allen	Director
	Patrick E. Allen
/s/	Michael L. Bennett	Director
	Michael L. Bennett
/s/	Deborah B. Dunie	Director
	Deborah B. Dunie
/s/	Darryl B. Hazel	Director
	Darryl B. Hazel
/s/	Singleton B. McAllister	Director
	Singleton B. McAllister
/s/	Thomas F. O’Toole	Director
	Thomas F. O’Toole
/s/	Dean C. Oestreich	Director
	Dean C. Oestreich
/s/	Carol P. Sanders	Director
	Carol P. Sanders
/s/	Susan D. Whiting	Director
	Susan D. Whiting

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ALLIANT ENERGY CORPORATION 401(k) SAVINGS PLAN

Pursuant to the requirements of the Securities Act of 1933, the Alliant Energy Corporation Total Compensation Committee, which administers the Alliant Energy Corporation 401(k) Savings Plan, has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Madison, State of Wisconsin, on May 5, 2016.

ALLIANT ENERGY CORPORATION

401(k) SAVINGS PLAN

/s/ Wayne A. Reschke

Wayne A. Reschke

Chairperson of the Alliant Energy Corporation Total Compensation Committee, administrator of the Alliant Energy Corporation 401(k) Savings Plan.

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EXHIBIT INDEX

Exhibit Number	Description of Document
4.1*	Amended and Restated Rights Agreement, dated as of December 11, 2008, between the Company and Wells Fargo Bank, N.A. (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form 8-A/A, dated December 11, 2008 (SEC File No. 1-9894))
5.1+	Opinion of Perkins Coie LLP
23.1+	Consent of Deloitte & Touche LLP, independent registered public accounting firm for the Company
23.2+	Consent of Perkins Coie LLP (included in opinion filed as Exhibit 5.1)
24.1+	Power of Attorney (see signature page)
99.1*	Alliant Energy Corporation 401(k) Savings Plan (incorporated by reference to Exhibit 99.1 to the Company's Post-Effective Amendment No. 1 to Form S-8 Registration Statement, dated May 5, 2016 (SEC File No. 333-117654))

+ Filed herewith.

* Incorporated herein by reference.

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EX-5.1

Exhibit 5.1

May 5, 2016

Alliant Energy Corporation

4902 North Biltmore Lane

Madison, Wisconsin 53718

Re: Registration Statement on Form S-8 of Shares of Common Stock, par value $.01 per share, of Alliant Energy Corporation

Ladies and Gentlemen:

We have acted as counsel to Alliant Energy Corporation, a Wisconsin corporation (the “Company”), in connection with the preparation of a Registration Statement on Form S-8 (the “Registration Statement”) under the Securities Act of 1933, as amended (the “Act”), which the Company is filing with the Securities and Exchange Commission (the “SEC”) with respect to up to 1,000,000 shares of common stock of the Company, par value $.01 per share (the “Shares”), that may be issued under the Company’s 401(k) Savings Plan (the “401(k) Plan”), together with attached common share purchase rights of the Company (the “Rights”) issuable by the Company pursuant to the Amended and Restated Rights Agreement (the “Rights Agreement”), dated as of December 11, 2008, between the Company and Wells Fargo Bank, National Association, as trustee, as amended from time to time.

We have examined the Registration Statement and such documents and records of the Company as we have deemed necessary for the purposes of this opinion. In giving this opinion, we are assuming the authenticity of all instruments presented to us as originals, the conformity with originals of all instruments presented to us as copies and the genuineness of all signatures.

Our opinion set forth below is limited to the federal laws of the United States and the laws of the State of Wisconsin. Our opinion is as of the date hereof and we have no responsibility to update this opinion for events and circumstances occurring after the date hereof or as to facts relating to prior events that are subsequently brought to our attention. This opinion is limited to the laws, including the rules and regulations, as in effect on the date hereof, and we disavow any undertaking to advise you of any changes in law.

Based upon and subject to the foregoing, we are of the opinion that:

1.    The Shares, if and when issued by the Company as original issuance shares pursuant to the terms and conditions of 401(k) Plan and as contemplated by the Registration Statement, will be legally issued, fully paid and nonassessable.

2.    The Rights, when the Shares are issued in accordance with the terms and conditions of the 401(k) Plan and as contemplated by Registration Statement, will be legally issued.

Our opinion in paragraph 2 above:

(a)    does not address the determination a court of competent jurisdiction may make regarding whether the Board of Directors of the Company would be required to redeem or terminate, or take other action with respect to, the Rights at some future time based on the facts and circumstances existing at that time;

(b)    assumes that the members of the Board of Directors have acted in a manner consistent with their fiduciary duties as required under applicable law in adopting the Rights Agreement; and

(c)    addresses the Rights and the Rights Agreement in their entirety, and it is not settled whether the invalidity of any particular provision of the Rights Agreement or of Rights thereunder would result in invalidating such Rights in their entirety.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement. In giving such consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the SEC thereunder.

Very truly yours,

/s/ Perkins Coie LLP

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports dated February 24, 2016, relating to the consolidated financial statements and financial statement schedules of Alliant Energy Corporation and subsidiaries (the “Company”), and the effectiveness of the Company’s internal control over financial reporting, appearing in the Annual Report on Form 10-K of Alliant Energy Corporation for the year ended December 31, 2015, and our report dated June 24, 2015 appearing in the Annual Report on Form 11-K of Alliant Energy Corporation 401(k) Savings Plan for the year ended December 31, 2014.

/s/ Deloitte & Touche LLP

Milwaukee, Wisconsin

May 2, 2016