SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G (RULE 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. _________)* TREMISIS ENERGY ACQUISITION CORPORATION -------------------------------------------------------------------------------- (Name of Issuer) Common Stock, $0.0001 par value -------------------------------------------------------------------------------- (Title of Class of Securities) 894727 10 6 -------------------------------------------------------------------------------- (CUSIP Number) December 31, 2004 -------------------------------------------------------------------------------- (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [ ] Rule 13d-1(b) [ ] Rule 13d-1(c) [x] Rule 13d-1(d) *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 in 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 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). ------------------------ ------------------------ CUSIP NO. 894727 10 6 13G PAGE 2 OF 6 PAGES ------------------------ ------------------------ -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) Lawrence S. Coben -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) [ ] (b) [ ] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 1,083,334 Shares NUMBER OF ------------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH ------------------------------------------------------------ REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 1,083,334 Shares ------------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,083,334 Shares -------------------------------------------------------------------------------- 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) [ ] -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 14.1% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! ------------------------ ------------------------ CUSIP NO. 894727 10 6 13G PAGE 3 OF 6 PAGES ------------------------ ------------------------ ITEM 1(A). NAME OF ISSUER: Tremisis Energy Acquisition Corporation -------------------------------------------------------------- ITEM 1(B.) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 1775 Broadway, Suite 604, New York, New York 10019 -------------------------------------------------------------- ITEM 2(A). NAME OF PERSONS FILING: Lawrence S. Coben ("Coben") -------------------------------------------------------------- ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: 1775 Broadway, Suite 604, New York, New York 10019 -------------------------------------------------------------- ITEM 2(C). CITIZENSHIP: Coben is a United States citizen -------------------------------------------------------------- ITEM 2(D). TITLE OF CLASS OF SECURITIES: Common Stock, par value $.0001 per share -------------------------------------------------------------- ITEM 2(E). CUSIP NUMBER: 894727 10 2 -------------------------------------------------------------- ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b), OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A: (a) [ ] Broker or dealer registered under Section 15 of the Exchange Act; (b) [ ] Bank as defined in Section 3(a)(6) of the Exchange Act; (c) [ ] Insurance company as defined in Section 3(a)(19) of the Exchange Act; (d) [ ] Investment company registered under Section 8 of the Investment Company Act; (e) [ ] An investment adviser in accordance with Rule 13d-1(b)(ii)(E); (f) [ ] An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F); (g) [ ] A parent holding company or control person in accordance with Rule 13d-1(b)(ii)(G) (h) [ ] A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act; (i) [ ] A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act; (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J). ------------------------ ------------------------ CUSIP NO. 894727 10 6 13G PAGE 4 OF 6 PAGES ------------------------ ------------------------ ITEM 4. OWNERSHIP Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. (a) Amount beneficially owned: Coben beneficially owns 1,083,334 shares of common stock. (b) Percent of Class: 14.1% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 1,083,334 shares of common stock (ii) Shared power to vote or to direct the vote: 0 shares of common stock (iii) Sole power to dispose or to direct the disposition of: 1,083,334 shares of common stock (iv) Shared power to dispose or to direct the disposition of: 0 shares of common stock Instruction: For computations regarding securities which represent a right to acquire an underlying security see Rule 13d-3(d)(1). ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: |_| ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. None. ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY OR CONTROL PERSON. None. ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP. None. ------------------------ ------------------------ CUSIP NO. 894727 10 6 13G PAGE 5 OF 6 PAGES ------------------------ ------------------------ ITEM 9. NOTICE OF DISSOLUTION OF GROUP. None. ITEM 10. CERTIFICATIONS. None. ------------------------ ------------------------ CUSIP NO. 894727 10 6 13G PAGE 6 OF 6 PAGES ------------------------ ------------------------ SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: January 31, 2005 /s/ Lawrence S. Coben ---------------------------------- Name: Lawrence S. Coben Title: Chairman and CEO