October 1, 2004


Energy Conversion Devices, Inc.
2956 Waterview Drive
Rochester Hills, Michigan 48309

Re:  Post Effective Amendment No. 2 to Registration
     Statement on Form S-1 No. 333-113435

Ladies and Gentlemen:

      I am the General Counsel of Energy Conversion Devices, Inc., a Delaware
corporation (the "Company"). I am issuing this opinion in connection with the
preparation of Post Effective Amendment No. 2 to Registration Statement on Form
S-1 No. 333-113435 (the "Post Effective Amendment No. 2") being filed on the
date hereof with the Securities and Exchange Commission (the "SEC") under the
Securities Act of 1933, as amended (the "Act") relating to the offering from
time to time, in one or more offerings, by certain of the Company's stockholders
under Rule 415 of the General Rules and Regulations of the SEC promulgated under
the Act, of an aggregate of 764,452 shares of the Company's Common Stock, par
value $.01 per share (the "Shares").

      In connection with the delivery of this opinion, I have examined originals
or copies of the restated certificate of incorporation of the Company, as
amended and approved by the board of directors and stockholders of the Company,
the bylaws of the Company, as amended and approved by the board of directors and
stockholders of the Company, the Post Effective Amendment No. 2, resolutions
adopted by the Board of Directors and stockholders of the Company, and such
other records, agreements, instruments, certificates and other documents of
public officials, the Company and its officers and representatives, and have
made such inquiries of the Company and its officers and representatives, as I
have deemed necessary or appropriate in connection with the opinions set forth
herein. I am familiar with the proceedings taken by the Company in connection
with the authorization, registration, issuance and sale of the Shares. With
respect to certain factual matters material to my opinion, I have relied upon
representations from, or certificates of, officers of the Company. In making
such examination and rendering the opinions set forth below, I have assumed
without verification the genuineness of all signatures, the authenticity of all
documents submitted to me as originals, the authenticity of the originals of
such documents submitted to me as certified copies, the conformity to originals
of all documents submitted to me as copies, the authenticity of the originals of
such latter documents, and that all documents submitted to me as certified
copies are true and correct copies of such originals.



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Energy Conversion Devices, Inc.
October 1, 2004
Page 2
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      I am a member of the Bar of the State of Michigan, and I have not
considered, and I express no opinion as to, the laws of any jurisdiction other
than the laws of the United States of America, the State of Michigan and the
General Corporation Law of the State of Delaware.

      Based upon and subject to the foregoing qualifications, assumptions and
limitations and the further limitations set forth below, I hereby advise you
that in my opinion, the Shares have been duly authorized by all necessary
corporate action on the part of the Company, have been validly issued and are
fully paid and nonassessable.

      I hereby consent to the filing of this opinion with the SEC as Exhibit 5.1
to the Post Effective Amendment No. 2 and to the use of my name under the
heading "Legal Matters" in the prospectus which is part of the Post Effective
Amendment No. 2. In giving this consent, I do not hereby admit that I am in the
category of persons whose consent is required under Section 7 of the Act or the
rules and regulations of the SEC.

      I do not find it necessary for the purposes of this opinion, and
accordingly I do not purport to cover herein, the application of the securities
or "Blue Sky" laws of the various states to the issuance and sale of the Shares.

      This opinion is limited to the specific issues addressed herein, and no
opinion may be inferred or implied beyond that expressly stated herein. I assume
no obligation to revise or supplement this opinion should the General
Corporation Law of the State of Delaware be changed by legislative action,
judicial decision or otherwise.

      This opinion is furnished to you in connection with the filing of the Post
Effective Amendment No. 2 and is not to be used, circulated, quoted or otherwise
relied upon for any other purpose.

                                          Very truly yours,

                                          /s/ Roger John Lesinski

                                          Roger John Lesinski
                                          General Counsel

