Document:

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                      INVESTMENT MANAGEMENT TRUST AGREEMENT

                  This Agreement is made as of __________ ____, 2004 by and
between Tremisis Energy Acquisition Corporation (the "Company") and Continental
Stock Transfer & Trust Company ("Trustee").

                  WHEREAS, the Company's Registration Statement on Form S-1, No.
333-113583 ("Registration Statement"), for its initial public offering of
securities ("IPO") has been declared effective as of the date hereof by the
Securities and Exchange Commission ("Effective Date"); and

                  WHEREAS, EarlyBirdCapital, Inc. ("EBC") is acting as the
representative of the underwriters in the IPO; and

                  WHEREAS, as described in the Company's Registration Statement,
and in accordance with the Company's Certificate of Incorporation, $20,400,000
of the gross proceeds of the IPO ($23,550,000 if the underwriters over-allotment
option is exercised in full) will be delivered to the Trustee to be deposited
and held in a trust account for the benefit of the Company and the holders of
the Company's common stock, par value $.0001 per share, issued in the IPO (the
amount to be delivered to the Trustee will be referred to herein as the
"Property"; the stockholders for whose benefit the Trustee shall hold the
Property will be referred to as the "Public Stockholders," and the Public
Stockholders and the Company will be referred to together as the
"Beneficiaries"); and

                  WHEREAS, the Company and the Trustee desire to enter into this
Agreement to set forth the terms and conditions pursuant to which the Trustee
shall hold the Property;

                  IT IS AGREED:

1.  Agreements and Covenants of Trustee. The Trustee hereby agrees and covenants
to:

                  (a) Hold the Property in trust for the Beneficiaries in
accordance with the terms of this Agreement in a segregated trust account
("Trust Account") established by the Trustee at a branch of JPMorgan Chase NY
Bank selected by the Trustee;

                  (b) Manage, supervise and administer the Trust Account subject
to the terms and conditions set forth herein;

                  (c) In a timely manner, upon the instruction of the Company,
to invest and reinvest the Property in any "Government Security." As used
herein, Government Security means any Treasury Bill issued by the United States,
having a maturity of one hundred and eighty days or less;

                  (d) Collect and receive, when due, all principal and income
arising from the Property, which shall become part of the "Property," as such
term is used herein;

                  (e) Notify the Company of all communications received by it
with respect to
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any Property requiring action by the Company;

                  (f) Supply any necessary information or documents as may be
requested by the Company in connection with the Company's preparation of the tax
returns for the Trust Account;

                  (g) Participate in any plan or proceeding for protecting or
enforcing any right or interest arising from the Property if, as and when
instructed by the Company to do so;

                  (h) Render to the Company and to EBC, and to such other person
as the Company may instruct, monthly written statements of the activities of and
amounts in the Trust Account reflecting all receipts and disbursements of the
Trust Account; and

                  (i) Commence liquidation of the Trust Account only after
receipt of and only in accordance with the terms of a letter ("Termination
Letter"), in a form substantially similar to that attached hereto as either
Exhibit A or Exhibit B, signed on behalf of the Company by its President or
Chairman of the Board and Secretary, and complete the liquidation of the Trust
Account and distribute the Property in the Trust Account only as directed in the
Termination Letter and the other documents referred to therein.

2. Agreements and Covenants of the Company. The Company hereby agrees and
covenants to:

                  (a) Give all instructions to the Trustee hereunder in writing,
signed by the Company's President or Chairman of the Board. In addition, except
with respect to its duties under paragraph 1(i) above, the Trustee shall be
entitled to rely on, and shall be protected in relying on, any verbal or
telephonic advice or instruction which it in good faith believes to be given by
any one of the persons authorized above to give written instructions, provided
that the Company shall promptly confirm such instructions in writing;

                  (b) Hold the Trustee harmless and indemnify the Trustee from
and against, any and all expenses, including reasonable counsel fees and
disbursements, or loss suffered by the Trustee in connection with any action,
suit or other proceeding brought against the Trustee involving any claim, or in
connection with any claim or demand which in any way arises out of or relates to
this Agreement, the services of the Trustee hereunder, or the Property or any
income earned from investment of the Property, except for expenses and losses
resulting from the Trustee's gross negligence or willful misconduct. Promptly
after the receipt by the Trustee of notice of demand or claim or the
commencement of any action, suit or proceeding, pursuant to which the Trustee
intends to seek indemnification under this paragraph, it shall notify the
Company in writing of such claim (hereinafter referred to as the "Indemnified
Claim"). The Trustee shall have the right to conduct and manage the defense
against such Indemnified Claim, provided, that the Trustee shall obtain the
consent of the Company with respect to the selection of counsel, which consent
shall not be unreasonably withheld. The Company may participate in such action
with its own counsel; and

                  (c) Pay the Trustee an initial acceptance fee of $1,000 and an
annual fee of

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$3,000 (it being expressly understood that the Property shall not be used to pay
such fee). The Company shall pay the Trustee the initial acceptance fee and
first year's fee at the consummation of the IPO and thereafter on the
anniversary of the Effective Date. The Trustee shall refund to the Company the
fee (on a pro rata basis) with respect to any period after the liquidation of
the Trust Fund. The Company shall not be responsible for any other fees or
charges of the Trustee except as may be provided in paragraph 2(b) hereof (it
being expressly understood that the Property shall not be used to make any
payments to the Trustee under such paragraph).

3. Limitations of Liability. The Trustee shall have no responsibility or
liability to:

                  (a) Take any action with respect to the Property, other than
as directed in paragraph 1 hereof and the Trustee shall have no liability to any
party except for liability arising out of its own gross negligence or willful
misconduct;

                  (b) Institute any proceeding for the collection of any
principal and income arising from, or institute, appear in or defend any
proceeding of any kind with respect to, any of the Property unless and until it
shall have received instructions from the Company given as provided herein to do
so and the Company shall have advanced or guaranteed to it funds sufficient to
pay any expenses incident thereto;

                  (c) Change the investment of any Property, other than in
compliance with paragraph 1(c);

                  (d) Refund any depreciation in principal of any Property;

                  (e) Assume that the authority of any person designated by the
Company to give instructions hereunder shall not be continuing unless provided
otherwise in such designation, or unless the Company shall have delivered a
written revocation of such authority to the Trustee;

                  (f) The other parties hereto or to anyone else for any action
taken or omitted by it, or any action suffered by it to be taken or omitted, in
good faith and in the exercise of its own best judgment, except for its gross
negligence or willful misconduct. The Trustee may rely conclusively and shall be
protected in acting upon any order, notice, demand, certificate, opinion or
advice of counsel (including counsel chosen by the Trustee), statement,
instrument, report or other paper or document (not only as to its due execution
and the validity and effectiveness of its provisions, but also as to the truth
and acceptability of any information therein contained) which is believed by the
Trustee, in good faith, to be genuine and to be signed or presented by the
proper person or persons. The Trustee shall not be bound by any notice or
demand, or any waiver, modification, termination or rescission of this agreement
or any of the terms hereof, unless evidenced by a written instrument delivered
to the Trustee signed by the proper party or parties and, if the duties or
rights of the Trustee are affected, unless it shall give its prior written
consent thereto;

                  (g) Verify the correctness of the information set forth in the
Registration Statement or to confirm or assure that any acquisition made by the
Company or any other action taken by it is as contemplated by the Registration
Statement; and

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                  (h) Pay any taxes on behalf of the Trust Account (it being
expressly understood that the Property shall not be used to pay any such taxes
and that such taxes, if any, shall be paid by the Company from funds not held in
the Trust Account).

4. Termination. This Agreement shall terminate as follows:

                  (a) If the Trustee gives written notice to the Company that it
desires to resign under this Agreement, the Company shall use its reasonable
efforts to locate a successor trustee. At such time that the Company notifies
the Trustee that a successor trustee has been appointed by the Company and has
agreed to become subject to the terms of this Agreement, the Trustee shall
transfer the management of the Trust Account to the successor trustee, including
but not limited to the transfer of copies of the reports and statements relating
to the Trust Account, whereupon this Agreement shall terminate; provided,
however, that, in the event that the Company does not locate a successor trustee
within ninety days of receipt of the resignation notice from the Trustee, the
Trustee may submit an application to have the Property deposited with the United
States District Court for the Southern District of New York and upon such
deposit, the Trustee shall be immune from any liability whatsoever;

                  (b) At such time that the Trustee has completed the
liquidation of the Trust Account in accordance with the provisions of paragraph
1(i) hereof, and distributed the Property in accordance with the provisions of
the Termination Letter, this Agreement shall terminate except with respect to
Paragraph 2(b); or

                  (c) On such date after ________ __, 2006 when the Trustee
deposits the Property with the United States District Court for the Southern
District of New York in the event that, prior to such date, the Trustee has not
received a Termination Letter from the Company pursuant to paragraph 1(i).

5. Miscellaneous.

                  (a) The Company and the Trustee each acknowledge that the
Trustee will follow the security procedures set forth below with respect to
funds transferred from the Trust Account. Upon receipt of written instructions,
the Trustee will confirm such instructions with an Authorized Individual at an
Authorized Telephone Number listed on the attached Exhibit C. The Company and
the Trustee will each restrict access to confidential information relating to
such security procedures to authorized persons. Each party must notify the other
party immediately if it has reason to believe unauthorized persons may have
obtained access to such information, or of any change in its authorized
personnel. In executing funds transfers, the Trustee will rely upon account
numbers or other identifying numbers of a beneficiary, beneficiary's bank or
intermediary bank, rather than names. The Trustee shall not be liable for any
loss, liability or expense resulting from any error in an account number or
other identifying number, provided it has accurately transmitted the numbers
provided.

                  (b) This Agreement shall be governed by and construed and
enforced in

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accordance with the laws of the State of New York, without giving effect to
conflict of laws. It may be executed in several counterparts, each one of which
shall constitute an original, and together shall constitute but one instrument.

                  (c) This Agreement contains the entire agreement and
understanding of the parties hereto with respect to the subject matter hereof.
This Agreement or any provision hereof may only be changed, amended or modified
by a writing signed by each of the parties hereto; provided, however, that no
such change, amendment or modification may be made without the prior written
consent of EBC. As to any claim, cross-claim or counterclaim in any way relating
to this Agreement, each party waives the right to trial by jury.

                  (d) The parties hereto consent to the jurisdiction and venue
of any state or federal court located in the City of New York for purposes of
resolving any disputes hereunder.

                  (e) Any notice, consent or request to be given in connection
with any of the terms or provisions of this Agreement shall be in writing and
shall be sent by express mail or similar private courier service, by certified
mail (return receipt requested), by hand delivery or by facsimile transmission:

                  if to the Trustee, to:

                           Continental Stock Transfer
                             & Trust Company
                           17 Battery Place
                           New York, New York 10004
                           Attn: Steven G. Nelson
                           Fax No.: (212) 509-5150

                  if to the Company, to:

                           Tremisis Energy Acquisition Corporation
                           1775 Broadway
                           Suite 604
                           New York, New York 10019
                           Attn:    Lawrence S. Coben, Chairman
                           Fax No.: (212) 509-5150

                  in either case with a copy to:

                           EarlyBirdCapital, Inc.
                           600 Third Avenue, 33rd Floor
                           New York, New York 10016
                           Attn:    David M. Nussbaum, Chairman
                           Fax No.:  (212) 269-3796

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                  (f) This Agreement may not be assigned by the Trustee without
the prior consent of the Company.

                  (g) Each of the Trustee and the Company hereby represents that
it has the full right and power and has been duly authorized to enter into this
Agreement and to perform its respective obligations as contemplated hereunder.
The Trustee acknowledges and agrees that it shall not make any claims or proceed
against the Trust Account, including by way of set-off, and shall not be
entitled to any funds in the Trust Account under any circumstance.

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                  IN WITNESS WHEREOF, the parties have duly executed this
Investment Management Trust Agreement as of the date first written above.

                             CONTINENTAL STOCK TRANSFER & TRUST
                             COMPANY, as Trustee

                             By: ____________________________
                                 Name:  Steven G. Nelson
                                 Title: Chairman

                             TREMISIS ENERGY ACQUISITION CORPORATION

                             By: _____________________________
                                 Name:  Lawrence S. Coben
                                 Title: Chairman

                                       7
<PAGE>

                                                                       EXHIBIT A

                             [LETTERHEAD OF COMPANY]

                                       [INSERT DATE]

Continental Stock Transfer
  & Trust Company
17 Battery Place
New York, New York 10004
Attn: Steven G. Nelson

                  Re:   Trust Account No. [             ] Termination Letter

Gentlemen:

                  Pursuant to paragraph 1(i) of the Investment Management Trust
Agreement between Tremisis Energy Acquisition Corporation ("Company") and
Continental Stock Transfer & Trust Company ("Trustee"), dated as of ___________,
2004 ("Trust Agreement"), this is to advise you that the Company has entered
into an agreement ("Business Agreement") with __________________ ("Target
Business") to consummate a business combination with Target Business ("Business
Combination") on or about [INSERT DATE]. The Company shall notify you at least
48 hours in advance of the actual date of the consummation of the Business
Combination ("Consummation Date").

                  In accordance with the terms of the Trust Agreement, we hereby
authorize you to commence liquidation of the Trust Account to the effect that,
on the Consummation Date, all of funds held in the Trust Account will be
immediately available for transfer to the account or accounts that the Company
shall direct on the Consummation Date.

                  On the Consummation Date (i) counsel for the Company shall
deliver to you written notification that the Business Combination has been
consummated, and (ii) the Company shall deliver to you written instructions with
respect to the transfer of the funds held in the Trust Account ("Instruction
Letter"). You are hereby directed and authorized to transfer the funds held in
the Trust Account immediately upon your receipt of the counsel's letter and the
Instruction Letter, in accordance with the terms of the Instruction Letter. In
the event that certain deposits held in the Trust Account may not be liquidated
by the Consummation Date without penalty, you will notify the Company of the
same and the Company shall direct you as to whether such funds should remain in
the Trust Account and distributed after the Consummation Date to the Company.
Upon the distribution of all the funds in the Trust Account pursuant to the
terms hereof, the Trust Agreement shall be terminated.

                  In the event that the Business Combination is not consummated
on the Consummation Date described in the notice thereof and we have not
notified you on or before the original Consummation Date of a new Consummation
Date, then the funds held in the Trust Account shall be reinvested as provided
in the Trust Agreement on the business day immediately following the
Consummation Date as set forth in the notice.

                                      Very truly yours,

                                      TREMISIS ENERGY ACQUISITION CORPORATION

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                                      By:________________________________
                                           Lawrence S. Coben, Chairman

                                      By:________________________________
                                           Isaac Kier, Secretary

                                       9
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                                                                       EXHIBIT B

                            [LETTERHEAD OF COMPANY]

                                      [INSERT DATE]

Continental Stock Transfer
  & Trust Company
17 Battery Place
New York, New York 10004
Attn: Steven G. Nelson

                  Re:    Trust Account No. [           ] Termination Letter

Gentlemen:

                  Pursuant to paragraph 1(i) of the Investment Management Trust
Agreement between Tremisis Energy Acquisition Corporation ("Company") and
Continental Stock Transfer & Trust Company ("Trustee"), dated as of ___________,
2004 ("Trust Agreement"), this is to advise you that the Board of Directors of
the Company has voted to dissolve and liquidate the Company. Attached hereto is
a copy of the minutes of the meeting of the Board of Directors of the Company
relating thereto, certified by the Secretary of the Company as true and correct
and in full force and effect.

                  In accordance with the terms of the Trust Agreement, we hereby
authorize you, to commence liquidation of the Trust Account. You will notify the
Company and ___________ ("Designated Paying Agent") in writing as to when all of
the funds in the Trust Account will be available for immediate transfer
("Transfer Date"). The Designated Paying Agent shall thereafter notify you as to
the account or accounts of the Designated Paying Agent that the funds in the
Trust Account should be transferred to on the Transfer Date so that the
Designated Paying Agent may commence distribution of such funds in accordance
with the Company's instructions. You shall have no obligation to oversee the
Designated Paying Agent's distribution of the funds. Upon the payment to the
Designated Paying Agent of all the funds in the Trust Account, the Trust
Agreement shall be terminated.

                                 Very truly yours,

                                 TREMISIS ENERGY ACQUISITION CORPORATION

                                 By:________________________________
                                      Lawrence S. Coben, Chairman

                                 By:________________________________
                                     Isaac Kier, Secretary

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                                    EXHIBIT C

AUTHORIZED INDIVIDUAL(S)                    AUTHORIZED
FOR TELEPHONE CALL BACK                     TELEPHONE NUMBER(S)

COMPANY:

Tremisis Energy Acquisition Corporation
1775 Broadway
Suite 604
New York, New York 10019
Attn:  Lawrence S. Coben, Chairman

TRUSTEE:

Continental Stock Transfer
  & Trust Company
17 Battery Place
New York, New York 10004
Attn: Steven G. Nelson<PAGE>

                                                                    Exhibit 10.6

                             STOCK ESCROW AGREEMENT

         STOCK ESCROW AGREEMENT, dated as of ___________ ___, 2004
("Agreement"), by and among TREMISIS ENERGY ACQUISITION CORPORATION, a Delaware
corporation ("Company"), LAWRENCE S. COBEN, ISAAC KIER, DAVID A. PREISER and JON
SCHOTZ (collectively "Initial Stockholders") and CONTINENTAL STOCK TRANSFER &
TRUST COMPANY, a New York corporation ("Escrow Agent").

          WHEREAS, the Company has entered into an Underwriting Agreement, dated
_______ __, 2004 ("Underwriting Agreement"), with EarlyBirdCapital, Inc. ("EBC")
acting as representative of the several underwriters (collectively, the
"Underwriters"), pursuant to which, among other matters, the Underwriters have
agreed to purchase 4,000,000 units ("Units") of the Company. Each Unit consists
of one share of the Company's Common Stock, par value $.0001 per share, and two
Warrants, each Warrant to purchase one share of Common Stock, all as more fully
described in the Company's final Prospectus, dated ________ __, 2004
("Prospectus") comprising part of the Company's Registration Statement on Form
S-1 (File No. 333-113583) under the Securities Act of 1933, as amended
("Registration Statement"), declared effective on ________ __, 2004 ("Effective
Date").

          WHEREAS, the Initial Stockholders have agreed as a condition of the
sale of the Units to deposit their shares of Common Stock of the Company, as set
forth opposite their respective names in Exhibit A attached hereto (collectively
"Escrow Shares"), in escrow as hereinafter provided.

          WHEREAS, the Company and the Initial Stockholders desire that the
Escrow Agent accept the Escrow Shares, in escrow, to be held and disbursed as
hereinafter provided.

          IT IS AGREED:

     1.   Appointment of Escrow Agent. The Company and the Initial Stockholders
hereby appoint the Escrow Agent to act in accordance with and subject to the
terms of this Agreement and the Escrow Agent hereby accepts such appointment and
agrees to act in accordance with and subject to such terms.

     2.   Deposit of Escrow Shares. On or before the Effective Date, each of the
Initial Stockholders shall deliver to the Escrow Agent certificates representing
his respective Escrow Shares, to be held and disbursed subject to the terms and
conditions of this Agreement. Each Initial Stockholder acknowledges that the
certificate representing his Escrow Shares is legended to reflect the deposit of
such Escrow Shares under this Agreement.

     3.   Disbursement of the Escrow Shares. The Escrow Agent shall hold the
Escrow Shares until the third anniversary of the Effective Date ("Escrow
Period"), on which date it shall, upon written instructions from each Initial
Stockholder, disburse each of the Initial Stockholder's Escrow Shares to such
Initial Stockholder; provided, however, that if the Escrow Agent is notified by
the Company pursuant to Section 6.7 hereof that the Company is being liquidated
at any time during the Escrow Period, then the Escrow Agent shall promptly
destroy the certificates representing the Escrow Shares and; provided further,
that if, after the Company consummates a Business Combination (as such term is
defined in the Registration Statement), it (or the surviving entity)
subsequently consummates a liquidation, merger, stock exchange or other similar
transaction which results in all of the stockholders of such entity having the
right to exchange their shares of Common Stock for cash, securities or other
property, then the Escrow Agent will, upon receipt of a certificate, executed by
the Chief Executive Officer of the Company, in form reasonably acceptable to the
Escrow Agent, that such transaction is then being consummated, and release the
Escrow Shares to the Initial Stockholders upon consummation of the transaction
so that they can similarly participate. The Escrow Agent shall have no further
duties hereunder after the disbursement or destruction of the Escrow Shares in
accordance with this Section 3.
<PAGE>

     4.   Rights of Initial Stockholders in Escrow Shares.

          4.1 Voting Rights as a Stockholder. Subject to the terms of the
Insider Letter described in Section 4.4 hereof and except as herein provided,
the Initial Stockholders shall retain all of their rights as stockholders of the
Company during the Escrow Period, including, without limitation, the right to
vote such shares.

          4.2 Dividends and Other Distributions in Respect of the Escrow Shares.
During the Escrow Period, all dividends payable in cash with respect to the
Escrow Shares shall be paid to the Initial Stockholders, but all dividends
payable in stock or other non-cash property ("Non-Cash Dividends") shall be
delivered to the Escrow Agent to hold in accordance with the terms hereof. As
used herein, the term "Escrow Shares" shall be deemed to include the Non-Cash
Dividends distributed thereon, if any.

          4.3 Restrictions on Transfer. During the Escrow Period, no sale,
transfer or other disposition may be made of any or all of the Escrow Shares
except (i) by gift to a member of Initial Stockholder's immediate family or to a
trust, the beneficiary of which is an Initial Stockholder or a member of an
Initial Stockholder's immediate family, (ii) by virtue of the laws of descent
and distribution upon death of any Initial Stockholder, or (iii) pursuant to a
qualified domestic relations order; provided, however, that such permissive
transfers may be implemented only upon the respective transferee's written
agreement to be bound by the terms and conditions of this Agreement and of the
Insider Letter signed by the Initial Stockholder transferring the Escrow Shares.
During the Escrow Period, the Initial Stockholders shall not pledge or grant a
security interest in the Escrow Shares or grant a security interest in their
rights under this Agreement.

          4.4 Insider Letters. Each of the Initial Stockholders has executed a
letter agreement with EBC and the Company, dated as indicated on Exhibit A
hereto, and which is filed as an exhibit to the Registration Statement ("Insider
Letter"), respecting the rights and obligations of such Initial Stockholder in
certain events, including but not limited to the liquidation of the Company.

     5. Concerning the Escrow Agent.

          5.1 Good Faith Reliance. The Escrow Agent shall not be liable for any
action taken or omitted by it in good faith and in the exercise of its own best
judgment, and may rely conclusively and shall be protected in acting upon any
order, notice, demand, certificate, opinion or advice of counsel (including
counsel chosen by the Escrow Agent), statement, instrument, report or other
paper or document (not only as to its due execution and the validity and
effectiveness of its provisions, but also as to the truth and acceptability of
any information therein contained) which is believed by the Escrow Agent to be
genuine and to be signed or presented by the proper person or persons. The
Escrow Agent shall not be bound by any notice or demand, or any waiver,
modification, termination or rescission of this Agreement unless evidenced by a
writing delivered to the Escrow Agent signed by the proper party or parties and,
if the duties or rights of the Escrow Agent are affected, unless it shall have
given its prior written consent thereto.

          5.2 Indemnification. The Escrow Agent shall be indemnified and held
harmless by the Company from and against any expenses, including counsel fees
and disbursements, or loss suffered by the Escrow Agent in connection with any
action, suit or other proceeding involving any claim which in any way, directly
or indirectly, arises out of or relates to this Agreement, the services of the
Escrow Agent hereunder, or the Escrow Shares held by it hereunder, other than
expenses or losses arising from the gross negligence or willful misconduct of
the Escrow Agent. Promptly after the receipt by the Escrow Agent of notice of
any demand or claim or the commencement of any action, suit or proceeding, the
Escrow Agent shall notify the other parties hereto in writing. In the event of
the receipt of such notice, the Escrow Agent, in its sole discretion, may
commence an action in the nature of interpleader in an appropriate court to
determine ownership or disposition of the Escrow Shares or it may deposit the
Escrow Shares with the clerk

                                       2
<PAGE>

of any appropriate court or it may retain the Escrow Shares pending receipt of a
final, non-appealable order of a court having jurisdiction over all of the
parties hereto directing to whom and under what circumstances the Escrow Shares
are to be disbursed and delivered. The provisions of this Section 5.2 shall
survive in the event the Escrow Agent resigns or is discharged pursuant to
Sections 5.5 or 5.6 below.

          5.3 Compensation. The Escrow Agent shall be entitled to reasonable
compensation from the Company for all services rendered by it hereunder. The
Escrow Agent shall also be entitled to reimbursement from the Company for all
expenses paid or incurred by it in the administration of its duties hereunder
including, but not limited to, all counsel, advisors' and agents' fees and
disbursements and all taxes or other governmental charges.

          5.4 Further Assurances. From time to time on and after the date
hereof, the Company and the Initial Stockholders shall deliver or cause to be
delivered to the Escrow Agent such further documents and instruments and shall
do or cause to be done such further acts as the Escrow Agent shall reasonably
request to carry out more effectively the provisions and purposes of this
Agreement, to evidence compliance herewith or to assure itself that it is
protected in acting hereunder.

          5.5 Resignation. The Escrow Agent may resign at any time and be
discharged from its duties as escrow agent hereunder by its giving the other
parties hereto written notice and such resignation shall become effective as
hereinafter provided. Such resignation shall become effective at such time that
the Escrow Agent shall turn over to a successor escrow agent appointed by the
Company, the Escrow Shares held hereunder. If no new escrow agent is so
appointed within the 60 day period following the giving of such notice of
resignation, the Escrow Agent may deposit the Escrow Shares with any court it
reasonably deems appropriate.

          5.6 Discharge of Escrow Agent. The Escrow Agent shall resign and be
discharged from its duties as escrow agent hereunder if so requested in writing
at any time by the other parties hereto, jointly, provided, however, that such
resignation shall become effective only upon acceptance of appointment by a
successor escrow agent as provided in Section 5.5.

          5.7 Liability. Notwithstanding anything herein to the contrary, the
Escrow Agent shall not be relieved from liability hereunder for its own gross
negligence or its own willful misconduct.

     6.   Miscellaneous.

          6.1 Governing Law. This Agreement shall for all purposes be deemed to
be made under and shall be construed in accordance with the laws of the State of
New York.

          6.2 Third Party Beneficiaries. Each of the Initial Stockholders hereby
acknowledges that the Underwriters are third party beneficiaries of this
Agreement and this Agreement may not be modified or changed without the prior
written consent of EBC.

          6.3 Entire Agreement. This Agreement contains the entire agreement of
the parties hereto with respect to the subject matter hereof and, except as
expressly provided herein, may not be changed or modified except by an
instrument in writing signed by the party to the charged.

          6.4 Headings. The headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation thereof.

          6.5 Binding Effect. This Agreement shall be binding upon and inure to
the benefit of the respective parties hereto and their legal representatives,
successors and assigns.

                                       3
<PAGE>

          6.6 Notices. Any notice or other communication required or which may
be given hereunder shall be in writing and either be delivered personally or be
mailed, certified or registered mail, or by private national courier service,
return receipt requested, postage prepaid, and shall be deemed given when so
delivered personally or, if mailed, two days after the date of mailing, as
follows:

                  If to the Company, to:

                           Tremisis Energy Acquisition Corporation
                           1775 Broadway
                           Suite 604
                           New York, New York 10019
                           Attn:    Chairman

                  If to a Stockholder, to his address set forth in Exhibit A.

                  and if to the Escrow Agent, to:

                           Continental Stock Transfer & Trust Company
                           17 Battery Place
                           New York, New York  10004
                           Attn:    Chairman

                  A copy of any notice sent hereunder shall be sent to:

                           Bingham McCutchen LLP
                           399 Park Avenue
                           New York, New York 10022
                           Attn: Floyd I. Wittlin, Esq.

                  and:

                           EarlyBirdCapital, Inc.
                           600 Third Avenue
                           33rd Floor
                           New York, New York 10016
                           Attn:    David M. Nussbaum, Chairman

                  and:

                           Graubard Miller
                           600 Third Avenue
                           32nd Floor
                           New York, New York 10016
                           Attn:    David Alan Miller, Esq.

                  The parties may change the persons and addresses to which the
notices or other communications are to be sent by giving written notice to any
such change in the manner provided herein for giving notice.

          6.7 Liquidation of Company. The Company shall give the Escrow Agent
written notification of the liquidation and dissolution of the Company in the
event that the Company fails to consummate a Business Combination within the
time period(s) specified in the Prospectus.

                                       4
<PAGE>

                  WITNESS the execution of this Agreement as of the date first
above written.

                     TREMISIS ENERGY ACQUISITION CORPORATION

                                              By:  _____________________________
                                                   Lawrence S. Coben, Chairman

                                              INITIAL STOCKHOLDERS:

                                              ________________________________
                                              Lawrence S. Coben

                                              ________________________________
                                              Isaac Kier

                                              ________________________________
                                              David A. Preiser

                                              ________________________________
                                              Jon Schotz

                                              CONTINENTAL STOCK TRANSFER
                                                & TRUST COMPANY

                                              By:_______________________________
                                                 Name:
                                                 Title:

                                       5
<PAGE>

                                    EXHIBIT A

<TABLE>
<CAPTION>
Name and Address of                             Number            Stock                   Date of
Initial Stockholder                           of Shares     Certificate Number         Insider Letter
-------------------                           ---------     ------------------         --------------

<S>                                             <C>                <C>                        <C>
Lawrence S. Coben                               733,334            1, 5, 9              March 3, 2004
1775 Broadway, Suite 604
New York, New York 10019

Isaac Kier                                      133,334            2, 6, 10             March 3, 2004
1775 Broadway, Suite 604
New York, New York 10019

David A. Preiser                                 66,666            3, 7, 11             March 3, 2004
c/o Houlihan Lokey Howard & Zukin
685 Third Avenue
New York, New York 10016

Jon Schotz                                       66,666            4, 8, 12             March 3, 2004
c/o Saybrook Capital, LLC
401 Wilshire Boulevard, Suite 850
Santa Monica, California 90401
</TABLE>

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