Exhibit 8.1

[Tax Opinion of Skadden, Arps, Slate, Meagher & Flom LLP]

October 3, 2014

Wisconsin Energy Corporation

231 West Michigan Street

Milwaukee, WI 53203

Ladies and Gentlemen:

We have acted as special U.S. tax counsel to Wisconsin Energy Corporation, a Wisconsin corporation (“Wisconsin Energy”), in connection with the preparation and filing of the Registration Statement on Form S-4, which includes the Joint Proxy Statement/Prospectus, filed with the Securities and Exchange Commission on August 13, 2014, as amended through the date hereof, filed in connection with the acquisition by Wisconsin Energy of all of the common shares of Integrys Energy Group, Inc., a Wisconsin corporation (“Integrys”), in exchange for common shares of Wisconsin Energy and cash consideration, with cash paid in lieu of fractional shares, pursuant to the Agreement and Plan of Merger, dated June 22, 2014, by and among Wisconsin Energy and Integrys (the “Agreement”).(1) Pursuant to the Agreement, (i) WEC Acquisition Corp, a Wisconsin corporation (“Merger Sub”), will merge with and into Integrys, with Integrys surviving (the “Initial Merger”), and (ii) immediately thereafter and as part of an integrated transaction, Intergrys will merge with and into GET Acquisition Corp. a Wisconsin Corporation (“Subsequent Merger Sub”), with Subsequent Merger Sub surviving (the “Subsequent Merger” and, together with the Initial Merger, the “Reorganization”).

In connection with our opinion, we have reviewed originals or copies, certified or otherwise identified to our satisfaction, of the Agreement, the Joint Proxy Statement/Prospectus (prepared with respect to the Reorganization) and such other documents, certificates and records as we have deemed necessary or appropriate as a basis for the opinion set forth below.  We have assumed that the Reorganization will be consummated in accordance with the Agreement, the Joint Proxy Statement/Prospectus and such other documents, certificates and records.

For purposes of our opinion, we have assumed the legal capacity of all natural persons, the genuineness of all signatures, the authenticity of all documents submitted to us as

(1)Unless otherwise defined, capitalized terms used in this opinion have the meanings assigned to them in the Agreement.

Wisconsin Energy Corporation

October 3, 2014

Page 2

originals, the conformity to original documents of all documents submitted to us as certified, conformed, electronic or photostatic copies and the authenticity of the originals of such latter documents.  We have assumed that such documents, certificates and records are duly authorized, valid and enforceable.

In rendering our opinion, we have also relied upon statements and representations of officers and other representatives of Wisconsin Energy, Merger Sub, Subsequent Merger Sub and Integrys, including factual statements and representations set forth in officers’ certificates dated the date hereof from officers of Wisconsin Energy, Merger Sub, Subsequent Merger Sub and Integrys (the “Representation Letters”) and have assumed that such statements and representations are and will continue to be correct as of the Effective Time without regard to any qualification as to knowledge or belief. Our opinion assumes and is expressly conditioned on, among other things, the initial and continuing accuracy and completeness of the facts, information, representations, covenants and agreements set forth in the documents referred to above and the statements, representations, covenants and agreements made by Wisconsin Energy, Merger Sub, Subsequent Merger Sub and Integrys, including those set forth in the Representation Letters, and we have assumed (i) that the Representation Letters will be re-executed by appropriate officers, and that we will render our opinion pursuant to sections 7.02(d) and 7.03(d) of the Agreement, as of the Effective Time, and (ii) that there will be no change in law between the date hereof and the Effective Time.

In rendering our opinion, we have relied on the Internal Revenue Code of 1986, as amended (the “Code”), Treasury Regulations, judicial authorities, published positions of the Internal Revenue Service (the “Service”) and such other authorities as we have considered relevant, all as in effect as of the date of this opinion and all of which are subject to differing interpretations or change at any time (possibly with retroactive effect).  A change in the authorities upon which our opinion is based, or any variation or difference in any fact from those set forth or assumed herein or in the Joint Proxy Statement/Prospectus, the Agreement or the Representation Letters, could affect our conclusions.  An opinion of counsel is not binding on the Service or any court.  No assurance can be given that the Service would not assert, or that a court would not sustain, a position contrary to this opinion.

Based upon and subject to the foregoing, we are of the opinion that, under current U.S. federal income tax law, the Reorganization will be treated as a reorganization within the meaning of Section 368(a) of the Code.

Except as set forth above, we express no other opinion.  This opinion is furnished to you solely for your benefit in connection with the Reorganization and is not to be relied upon by anyone else without our prior written consent.  This opinion is expressed as of the date hereof, and we are under no obligation to supplement or revise our opinion to reflect any legal developments or factual matters arising subsequent to the date hereof or the impact of any information, document, certificate, record, statement, representation, covenant, or assumption relied upon herein that becomes incorrect or untrue.

Very truly yours,

/s/ Skadden, Arps, Slate, Meagher & Flom LLP