Securities and Exchange Commission
Washington, D.C. 20549

SCHEDULE 13D/A

Under the Securities Exchange Act of 1934

Energy Conversion Devices, Inc.

Common Stock, $0.01 par value

292659109

Chevron Corporation

(Name, Address and Telephone Number of Persons Authorized to Receive Notices and Communications)

May 16, 2005
(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of § 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.o

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of section 18 of the Securities Exchange Act of 1934 (the “Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

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CUSIP No. 292659109

     TRMI Holdings Inc. (“TRMI-H”), its parent corporations Texaco Inc. (“Texaco”), Chevron Asiatic Limited (“CAL”), ChevronTexaco Overseas Petroleum Inc. (“CTOPI”) and its ultimate parent company Chevron Corporation (“Chevron”) (collectively, the “Corporations”) hereby further amend and supplement the Report on Schedule 13D originally filed by Texaco on June 12, 2000, and amended by Amendment No. 1 on November 7, 2000, Amendment No. 2 on September 20, 2001 and Amendment No 3 on December 7, 2004 (the “Schedule 13D”) with respect to the common stock, par value $0.01 per share (the “Common Stock”), of Energy Conversion Devices, Inc. (the “Issuer”). In May 2005, ChevronTexaco Corporation changed its name to Chevron Corporation.

     With respect to each contract, agreement or other document referred to herein and filed with the Securities and Exchange Commission (the “Commission”) as an exhibit to the Schedule 13D, reference is made to the exhibit for a more complete description of the matter involved, and each such statement shall be deemed qualified in its entirety by such reference.

Item 2. Identity and Background.

     The response to Item 2 of the Schedule 13D is hereby amended and supplemented as follows:

     Schedules I, II, III, IV and V which are attached hereto and incorporated herein in their entirety by reference, set forth the name, residence or business address, citizenship and certain employment information of each of the executive officers and directors of each of the Corporations.

     During the last five years, none of the Corporations and none of the natural persons identified above (a) has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (b) has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Item 3. Source and Amount of Funds or Other Consideration.

     Not applicable.

Item 4. Purpose of Transaction.

     The response to Item 4 of the Schedule 13D is hereby amended and supplemented as follows:

     Effective May 16, 2005, the Issuer (as assignee of Ovonic Battery Company, Inc. (“OBC”)) has exercised the Option (as such term is defined in Item 4 of Amendment No. 3 to this Schedule 13D) and purchased from TRMI-H all of the 4,376,633 shares of Common Stock held by TRMI-H at an option exercise price of $4.55 per share. TRMI-H has delivered all stock certificates representing such shares of Common Stock to the Issuer at its offices in Rochester Hills, Michigan.

Item 5. Interest in Securities of the Issuer.

     The response to Item 5 is hereby amended and supplemented as follows:

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CUSIP No. 292659109

Item 6. Contracts, Arrangements, Understandings or Relationships with respect to Securities of the Issuer.

     The response to Item 6 of the Schedule 13D is hereby amended and supplemented as follows:

     The description of the Option Agreement appearing in Item 4 of Amendment No. 3 to this Schedule 13D is hereby incorporated by reference.

Item 7. Material to be filed as Exhibits.

     Not applicable.

* * *

Signature

     After reasonable inquiry and to the best of their knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct.

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CUSIP No. 292659109

Schedule I

     The following table sets forth the name, residence or business address, citizenship, present principal occupation or employment, and the name, principal business and address of any corporation in which such employment is conducted, of each executive officer and director of Chevron Corporation (“Chevron”).

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CUSIP No. 292659109

Schedule II

     The following table sets forth the name, residence or business address, citizenship, present principal occupation or employment, and the name, principal business and address of any corporation in which such employment is conducted, of each executive officer and director of ChevronTexaco Overseas Petroleum Inc. (“CTOPI”).

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CUSIP No. 292659109

Schedule III

     The following table sets forth the name, residence or business address, citizenship, present principal occupation or employment, and the name, principal business and address of any corporation in which such employment is conducted, of each executive officer and director of Chevron Asiatic Limited (“CAL”).

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CUSIP No. 292659109

Schedule IV

     The following table sets forth the name, residence or business address, citizenship, present principal occupation or employment, and the name, principal business and address of any corporation in which such employment is conducted, of each executive officer and director of Texaco Inc. (“Texaco”).

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CUSIP No. 292659109

Schedule V

     The following table sets forth the name, residence or business address, citizenship, present principal occupation or employment, and the name, principal business and address of any corporation in which such employment is conducted, of each executive officer and director of TRMI Holdings Inc. (“TRMI-H”).

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