UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D. C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                               (Amendment No __)*


                     TREMISIS ENERGY ACQUISITION CORPORATION
      --------------------------------------------------------------------
                                (Name of Issuer)


                    Common Stock, par value $0.0001 per share
      --------------------------------------------------------------------
                         (Title of Class of Securities)


                                    894727106
      --------------------------------------------------------------------
                                 (CUSIP Number)


                                 October 5, 2005
      --------------------------------------------------------------------
             (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)
            |X|   Rule 13d-1(c)
            |_|   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 the
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 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act.



CUSIP No. 894727106
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1.    Names of Reporting Persons.
      I.R.S. Identification Nos. of Above Persons (entities only)

      Jack Silver
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2.    Check the Appropriate Box if a Member of a Group (See Instructions)
                                                                         (a) |_|
                                                                         (b) |X|
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3.    SEC Use Only

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4.    Citizenship or Place of Organization

      United States citizen
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Number of            5.    Sole Voting Power
Shares
Beneficially               432,500
Owned by             -----------------------------------------------------------
Each                 6.    Shared Voting Power
Reporting
Person                     0
With:                -----------------------------------------------------------
                     7.    Sole Dispositive Power

                           432,500
                     -----------------------------------------------------------
                     8.    Shared Dispositive Power

                           0
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9.    Aggregate Amount Beneficially Owned by Each Reporting Person:

      432,500
--------------------------------------------------------------------------------
10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
      (See Instructions)
                                                                             |_|
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11.   Percent of Class Represented by Amount in Row (9)

      5.6%
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12.   Type of Reporting Person (See Instructions)

      IN
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                                      -2-


CUSIP No. 894727106

Item 1.

      (a)   Name of Issuer:

                  Tremisis Energy Acquisition Corporation

      (b)   Address of Issuer's Principal Executive Offices:

                  1775 Broadway
                  Suite 604
                  New York, NY  10019

Item 2.

      (a)   Name of Person Filing:

                  Jack Silver

      (b)   Address of Principal Business Office or, if none, Residence:

                  Sherleigh Associates LLC
                  660 Madison Avenue
                  New York, NY 10021

      (c)   Citizenship:

                  United States

      (d)   Title of Class of Securities:

                  Common Stock, par value $0.0001 per share

      (e)   CUSIP Number:

                  894727106

Item 3. If this statement is filed pursuant to ss.ss.240.13d-1(b), or
        240.13d-2(b) or (c), check whether the person filing is a:

(a) |_| Broker or Dealer registered under Section 15 of the Act

(b) |_| Bank as defined in section 3(a)(6) of the Act

(c) |_| Insurance Company as defined in section 3(a)(19) of the Act


                                      -3-


CUSIP No. 894727106

(d) |_| Investment Company registered under section 8 of the Investment Company
        Act

(e) |_| Investment Adviser registered under section 203 of the Investment
        Advisers Act of 1940

(f) |_| Employee Benefit Plan or endowment Fund in accordance with Rule
        13d-1(b)(1)(ii)(F);

(g) |_| Parent Holding Company, 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 investement
        company under section 3(c)(14) of the Investement Company Act of 1940;

(j) |_| Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

Item 4. Ownership.

(a) - (d)

      Jack Silver beneficially owns 432,500 shares of Common Stock of Tremisis
      Energy Acquisition Corporation representing 5.6% of the outstanding Common
      Stock. Such shares of Common Stock beneficially owned by Mr. Silver
      include (a) 430,000 shares of Common Stock held by Sherleigh Associates
      Inc. Profit Sharing Plan; and (b) 2,500 shares held by Sherleigh
      Associates Inc. Defined Benefit Pension Plan.

      Mr. Silver has the sole voting and dispositive power with respect to all
      432,500 shares of Common Stock beneficially owned by him.

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.

            Not applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired the
        Security Being Reported on By the Parent Holding Company or Control
        Person.

            Not applicable.


                                      -4-


CUSIP No. 894727106

Item 8. Identification and Classification of Members of the Group.

            Not applicable.

Item 9. Notice of Dissolution of Group.

            Not applicable.

Item 10. Certification.

      By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were not acquired and are not held for the
purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having such purposes or effect.


                                    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.

                                          October 15, 2005
                                          --------------------------------------
                                          Date


                                          /s/ Jack Silver
                                          --------------------------------------
                                          Signature

                                          Jack Silver
                                          --------------------------------------
                                          Name/Title


                                      -5-