EXHIBIT 10.17


                          REGISTRATION RIGHTS AGREEMENT

     THIS REGISTRATION RIGHTS AGREEMENT (this "Agreement") is entered into as of
May 8, 2006, by and among: Tremisis Energy Acquisition Corporation, a Delaware
corporation (the "Company"), and the undersigned parties listed under Investor
on the signature page hereto (each, an "Investor" and collectively, the
"Investors").

     WHEREAS, the Investors, formerly stockholders of RAM Energy, Inc., a
Delaware corporation ("RAM"), have received shares of Common Stock in exchange
for the shares of stock of RAM formerly held by them in connection with a merger
by which RAM has become a wholly owned subsidiary of the Company (the "Merger");

     WHEREAS, the Investors and the Company desire to enter into this Agreement
to provide the Investors with certain rights relating to the registration of
shares of Common Stock held by them;

     NOW, THEREFORE, in consideration of the mutual covenants and agreements set
forth herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

     1. DEFINITIONS. The following capitalized terms used herein have the
following meanings:

          "Agreement" means this Agreement, as amended, restated, supplemented,
     or otherwise modified from time to time.

          "Closing Date" shall mean the date the Merger is consummated.

          "Commission" means the Securities and Exchange Commission, or any
     other federal agency then administering the Securities Act or the Exchange
     Act.

          "Common Stock" means the common stock, par value $0.0001 per share, of
     the Company.

          "Company" is defined in the preamble to this Agreement.

          "Demand Registration" is defined in Section 2.1.1.

          "Demanding Holder" is defined in Section 2.1.1.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended,
     and the rules and regulations of the Commission promulgated thereunder, all
     as the same shall be in effect at the time.

          "Form S-3" is defined in Section 2.3.

          "Indemnified Party" is defined in Section 4.3.

          "Indemnifying Party" is defined in Section 4.3.

          "Investor" is defined in the preamble to this Agreement.

          "Investor Indemnified Party" is defined in Section 4.1.

          "Maximum Number of Shares" is defined in Section 2.2.2.

          "Merger" is defined in the first recital to this Agreement.

          "Notices" is defined in Section 6.3.

          "Piggy-Back Registration" is defined in Section 2.2.1.

          "RAM" is defined in the first recital to this Agreement.

          "Register," "registered" and/or "registration" means a registration
     effected by preparing and filing a registration statement or similar
     document in compliance with the requirements of the Securities Act, and the
     applicable rules and regulations promulgated thereunder, and such
     registration statement becoming effective.

          "Registrable Securities" mean all of the shares of Common Stock issued
     to Investors in the Merger. Registrable Securities include any warrants,
     shares of capital stock or other securities of the Company issued as a
     dividend or other distribution with respect to or in exchange for or in
     replacement of such shares of Common Stock. As to any particular
     Registrable Securities, such securities shall cease to be Registrable
     Securities when: (a) a Registration Statement with respect to the sale of
     such securities shall have become effective under the Securities Act and
     such securities shall have been sold, transferred, disposed of or exchanged
     in accordance with such Registration Statement; (b) such securities shall
     have been otherwise transferred, new certificates for them not bearing a
     legend restricting further transfer shall have been delivered by the
     Company and subsequent public distribution of them shall not require
     registration under the Securities Act; (c) such securities shall have
     ceased to be outstanding, or (d) such securities are freely salable under
     Rule 144(k) without volume limitations.

          "Registration Statement" means a registration statement filed by the
     Company with the Commission in compliance with the Securities Act and the
     rules and regulations promulgated thereunder for a public offering and sale
     of Common Stock (other than a registration statement on Form S-4 or Form
     S-8, or their successors, or any registration statement covering only
     securities proposed to be issued in exchange for securities or assets of
     another entity).

          "Release Date" means the date that is two years after the Closing
     Date.

          "Securities Act" means the Securities Act of 1933, as amended, and the
     rules and regulations of the Commission promulgated thereunder, all as the
     same shall be in effect at the time.

          "Underwriter" means a securities dealer who purchases any Registrable
     Securities as principal in an underwritten offering and not as part of such
     dealer's market-making activities.

     2. REGISTRATION RIGHTS.

          2.1 Demand Registration.

               2.1.1. Request for Registration. At any time and from time to
          time, but not prior to three (3) months following any underwritten
          public offering by the Company, and, except for registrations effected
          pursuant to Section 2.3, not earlier than the Release Date, the
          holders of a majority-in-interest of the Registrable Securities held
          by the Investors or the transferees of the Investors, may make a
          written demand for registration under the Securities Act of all or
          part of their Registrable Securities (a "Demand Registration");
          provided, however, that during the period ending December 31, 2008, no
          such demand shall be made except with the prior written consent of
          holders of Registrable Securities owing 80% of the then outstanding
          Registrable Securities. Any demand for a Demand Registration shall
          specify the number of shares of Registrable Securities proposed to be
          sold and the intended method(s) of distribution thereof. Each Demand
          Registration, other than one effected pursuant to Section 2.3, shall
          be subject to an aggregate price threshold of not less than
          $10,000,000. The Company will notify all holders of Registrable
          Securities of the demand, and each holder of Registrable Securities
          who wishes to include all or a portion of such holder's Registrable
          Securities in the Demand Registration (each such holder including
          shares of Registrable Securities in such registration, a "Demanding
          Holder") shall so notify the Company within thirty (30) days after the
          receipt by the holder of the notice from the Company. Upon any such
          request, the Demanding Holders shall be entitled to have their
          Registrable Securities included in the Demand Registration, subject to
          the provisos set forth in Section 3.1.1. The Company shall not be
          obligated to effect more than an aggregate of two (2) Demand
          Registrations under this Section 2.1.1 in respect of Registrable
          Securities other than those effected pursuant to Section 2.3.

               2.1.2. Effective Registration. A registration will not count as a
          Demand Registration until the Registration Statement filed with the
          Commission with respect to such Demand Registration has been declared
          effective and the Company has complied with all of its obligations
          under this Agreement with respect thereto; provided, however, that if,
          after such Registration Statement has been declared effective, the
          offering of Registrable Securities pursuant to a Demand Registration
          is interfered with by any stop order or injunction of the Commission
          or any court, the Registration Statement with respect to such Demand
          Registration will be deemed not to have been declared effective,
          unless and until, (i) such stop order or injunction is removed,
          rescinded or otherwise terminated, and (ii) a majority-in-interest of
          the Demanding Holders thereafter elect to continue the offering;
          provided, further, that the Company shall not be obligated to file a
          second Registration Statement until a Registration Statement that has
          been filed is counted as a Demand Registration or is terminated.

               2.1.3. Underwritten Offering. If a majority-in-interest of the
          Demanding Holders so elect and such holders so advise the Company as
          part of their written demand for a Demand Registration, the offering
          of such Registrable Securities pursuant to such Demand Registration
          shall be in the form of an underwritten offering. In such event, the
          right of any holder to include its Registrable Securities in such
          registration shall be conditioned upon such holder's participation in
          such underwriting and the inclusion of such holder's Registrable
          Securities in the underwriting to the extent provided herein. All
          Demanding Holders proposing to distribute their securities through
          such underwriting shall enter into an underwriting agreement in
          customary form with the Underwriter or Underwriters selected for such
          underwriting by a majority-in-interest of the holders initiating the
          Demand Registration.

          2.2 Piggy-Back Registration.

               2.2.1. Piggy-Back Rights. If at any time on or after the Closing
          Date the Company proposes to file a Registration Statement under the
          Securities Act with respect to an offering of equity securities, or
          securities or other obligations exercisable or exchangeable for, or
          convertible into, equity securities, by the Company for its own
          account or for stockholders of the Company for their account (or by
          the Company and by stockholders of the Company), other than a
          Registration Statement (i) filed in connection with any employee stock
          option or other benefit plan, (ii) for an exchange offer or offering
          of securities solely to the Company's existing stockholders, (iii) for
          an offering of debt that is convertible into equity securities of the
          Company or (iv) for a dividend reinvestment plan, then the Company
          shall (x) give written notice of such proposed filing to the holders
          of Registrable Securities as soon as practicable but in no event less
          than twenty (20) days before the anticipated filing date, which notice
          shall describe the amount and type of securities to be included in
          such offering, the intended method(s) of distribution, and the name of
          the proposed managing Underwriter or Underwriters, if any, of the
          offering, and (y) offer to the holders of Registrable Securities in
          such notice the opportunity to register the sale of such number of
          shares of Registrable Securities as such holders may request in
          writing within ten (10) days following receipt of such notice (a
          "Piggy-Back Registration"). The Company shall cause such Registrable
          Securities to be included in such registration and shall use its best
          efforts to cause the managing Underwriter or Underwriters of a
          proposed underwritten offering to permit the Registrable Securities
          requested to be included in a Piggy-Back Registration to be included
          on the same terms and conditions as any similar securities of the
          Company and to permit the sale or other disposition of such
          Registrable Securities in accordance with the intended method(s) of
          distribution thereof. All holders of Registrable Securities proposing
          to distribute their securities through a Piggy-Back Registration that
          involves an Underwriter or Underwriters shall enter into an
          underwriting agreement in customary form with the Underwriter or
          Underwriters selected for such Piggy-Back Registration.

               2.2.2. Reduction of Offering. If the managing Underwriter or
          Underwriters for a Piggy-Back Registration that is to be an
          underwritten offering advises the Company and the holders of
          Registrable Securities in writing that the dollar amount or number of
          shares of Common Stock which the Company desires to sell, taken
          together with shares of Common Stock, if any, as to which registration
          has been demanded pursuant to written contractual arrangements with
          persons other than the holders of Registrable Securities hereunder,
          the Registrable Securities as to which registration has been requested
          under this Section 2.2, and the shares of Common Stock, if any, as to
          which registration has been requested pursuant to the written
          contractual piggy-back registration rights of other stockholders of
          the Company, exceeds the maximum number of shares that, in the
          reasonable judgment of the Underwriters, can be effectively sold in
          the market at that time ("Maximum Number of Shares"), then the Company
          shall include in any such registration:

                    (i) If the registration is undertaken for the Company's
               account: (A) first, the shares of Common Stock or other
               securities that the Company desires to sell that can be sold
               without exceeding the Maximum Number of Shares; (B) second, to
               the extent that the Maximum Number of Shares has not been reached
               under the foregoing clause (A), the shares of Common Stock, if
               any, including the Registrable Securities, as to which
               registration has been requested pursuant to written contractual
               piggy-back registration rights of security holders (pro rata in
               accordance with the number of shares of Common Stock which each
               such person has actually requested to be included in such
               registration, regardless of the number of shares of Common Stock
               with respect to which such persons have the right to request such
               inclusion) that can be sold without exceeding the Maximum Number
               of Shares; and

                    (ii) If the registration is a "demand" registration
               undertaken at the demand of persons other than the holders of
               Registrable Securities pursuant to written contractual
               arrangements with such persons, (A) first, the shares of Common
               Stock for the account of the demanding persons that can be sold
               without exceeding the Maximum Number of Shares; (B) second, to
               the extent that the Maximum Number of Shares has not been reached
               under the foregoing clause (A), the shares of Common Stock or
               other securities that the Company desires to sell that can be
               sold without exceeding the Maximum Number of Shares; and (C)
               third, to the extent that the Maximum Number of Shares has not
               been reached under the foregoing clauses (A) and (B), the shares
               of Common Stock, if any, including the Registrable Securities, as
               to which registration has been requested pursuant to written
               contractual piggy-back registration rights of security holders
               (pro rata in accordance with the number of shares of Common Stock
               which each such person has actually requested to be included in
               such registration, regardless of the number of shares of Common
               Stock with respect to which such persons have the right to
               request such inclusion).

               2.2.3. Withdrawal. Any holder of Registrable Securities may elect
          to withdraw such holder's request for inclusion of Registrable
          Securities in any Piggy-Back Registration by giving written notice to
          the Company of such request to withdraw prior to the effectiveness of
          the Registration Statement. The Company may also elect to withdraw a
          registration statement at any time prior to the effectiveness of the
          Registration Statement. Notwithstanding any such withdrawal, the
          Company shall pay expenses incurred by the holders of Registrable
          Securities in connection with such Piggy-Back Registration as provided
          in Section 3.3.

          2.3 Registrations on Form S-3. The holders of Registrable Securities
     may at any time and from time to time request in writing that the Company
     register the resale of any or all of such Registrable Securities on Form
     S-3 or any similar short-form registration which may be available at such
     time ("Form S-3"); provided, however, that during the period ending
     December 31, 2008, no such request shall be made except with the prior
     written consent of holders of Registrable Securities owing 80% of the then
     outstanding Registrable Securities. The number of shares of Common Stock
     received by the Investors in the Merger that shall be eligible for sale
     under a Form S-3 shall be limited to (a) 20% of such shares during the
     period commencing on the day that is six (6) months after the Closing Date
     and continuing through the day immediately preceding the day that is one
     (1) year after the Closing Date, (b) an additional 20% (an aggregate of
     40%) of such shares during the period commencing on the day that is one
     year after the Closing Date and continuing through the day immediately
     preceding the day that is eighteen (18) months after the Closing Date, and
     (c) an additional 20% (an aggregate of 60%) of such shares during the
     period commencing on the day that is eighteen (18) months after the Closing
     Date and continuing through the day immediately preceding the day that is
     two (2) years after the Closing Date; and provided, further, however, that
     the Company shall not be obligated to effect such request through an
     underwritten offering. Upon receipt of such written request, the Company
     will promptly give written notice of the proposed registration to all other
     holders of Registrable Securities, and, as soon as practicable thereafter,
     effect the registration of all or such portion of such holder's or holders'
     Registrable Securities as are specified in such request, together with all
     or such portion of the Registrable Securities of any other holder or
     holders joining in such request as are specified in a written request given
     within fifteen (15) days after receipt of such written notice from the
     Company; provided, however, that the Company shall not be obligated to
     effect any such registration pursuant to this Section 2.3: (i) if Form S-3
     is not available for such offering; or (ii) if the holders of the
     Registrable Securities, together with the holders of any other securities
     of the Company entitled to inclusion in such registration, propose to sell
     Registrable Securities and such other securities (if any) at any aggregate
     price to the public of less than $10,000,000. Registrations effected
     pursuant to this Section 2.3 shall not be counted as Demand Registrations
     effected pursuant to Section 2.1. Registrable Securities registered
     pursuant to a Form S-3 registration under this Section shall still remain
     subject to the limitations of the Lock-Up Agreements dated October 20,
     2005, executed by the Investors in favor of the Company.

3. REGISTRATION PROCEDURES.

          3.1 Filings; Information. Whenever the Company is required to effect
     the registration of any Registrable Securities pursuant to Section 2, the
     Company shall use its best efforts to effect the registration and sale of
     such Registrable Securities in accordance with the intended method(s) of
     distribution thereof as expeditiously as practicable, and in connection
     with any such request:

               3.1.1. Filing Registration Statement. The Company shall, as
          expeditiously as possible and in any event within sixty (60) days
          after receipt of a request for a Demand Registration pursuant to
          Section 2.1, prepare and file with the Commission a Registration
          Statement on any form for which the Company then qualifies or which
          counsel for the Company shall deem appropriate and which form shall be
          available for the sale of all Registrable Securities to be registered
          thereunder in accordance with the intended method(s) of distribution
          thereof, and shall use its best efforts to cause such Registration
          Statement to become and remain effective for the period required by
          Section 3.1.3; provided, however, that the Company shall have the
          right to defer any Demand Registration for up to thirty (30) days, and
          any Piggy-Back Registration for such period as may be applicable to
          deferment of any demand registration to which such Piggy-Back
          Registration relates, in each case if the Company shall furnish to the
          holders a certificate signed by the Chief Executive Officer of the
          Company stating that, in the good faith judgment of the Board of
          Directors of the Company, it would be materially detrimental to the
          Company and its stockholders for such Registration Statement to be
          effected at such time; provided further, however, that the Company
          shall not have the right to exercise the right set forth in the
          immediately preceding proviso more than once in any 365-day period in
          respect of a Demand Registration hereunder.

               3.1.2. Copies. The Company shall, prior to filing a Registration
          Statement or prospectus, or any amendment or supplement thereto,
          furnish without charge to the holders of Registrable Securities
          included in such registration, and such holders' legal counsel, copies
          of such Registration Statement as proposed to be filed, each amendment
          and supplement to such Registration Statement (in each case including
          all exhibits thereto and documents incorporated by reference therein),
          the prospectus included in such Registration Statement (including each
          preliminary prospectus), and such other documents as the holders of
          Registrable Securities included in such registration or legal counsel
          for any such holders may request in order to facilitate the
          disposition of the Registrable Securities owned by such holders.

               3.1.3. Amendments and Supplements. The Company shall prepare and
          file with the Commission such amendments, including post-effective
          amendments, and supplements to such Registration Statement and the
          prospectus used in connection therewith as may be necessary to keep
          such Registration Statement effective and in compliance with the
          provisions of the Securities Act until all Registrable Securities and
          other securities covered by such Registration Statement have been
          disposed of in accordance with the intended method(s) of distribution
          set forth in such Registration Statement (which period shall not
          exceed the sum of one hundred eighty (180) days plus any period during
          which any such disposition is interfered with by any stop order or
          injunction of the Commission or any governmental agency or court) or
          such securities have been withdrawn.

               3.1.4. Notification. After the filing of a Registration
          Statement, the Company shall promptly, and in no event more than two
          (2) business days after such filing, notify the holders of Registrable
          Securities included in such Registration Statement of such filing, and
          shall further notify such holders promptly and confirm such advice in
          writing in all events within two (2) business days of the occurrence
          of any of the following: (i) when such Registration Statement becomes
          effective; (ii) when any post-effective amendment to such Registration
          Statement becomes effective; (iii) the issuance or threatened issuance
          by the Commission of any stop order (and the Company shall take all
          actions required to prevent the entry of such stop order or to remove
          it if entered); and (iv) any request by the Commission for any
          amendment or supplement to such Registration Statement or any
          prospectus relating thereto or for additional information or of the
          occurrence of an event requiring the preparation of a supplement or
          amendment to such prospectus so that, as thereafter delivered to the
          purchasers of the securities covered by such Registration Statement,
          such prospectus will not contain an untrue statement of a material
          fact or omit to state any material fact required to be stated therein
          or necessary to make the statements therein not misleading, and
          promptly make available to the holders of Registrable Securities
          included in such Registration Statement any such supplement or
          amendment; except that before filing with the Commission a
          Registration Statement or prospectus or any amendment or supplement
          thereto, including documents incorporated by reference, the Company
          shall furnish to the holders of Registrable Securities included in
          such Registration Statement and to the legal counsel for any such
          holders, copies of all such documents proposed to be filed
          sufficiently in advance of filing to provide such holders and legal
          counsel with a reasonable opportunity to review such documents and
          comment thereon, and the Company shall not file any Registration
          Statement or prospectus or amendment or supplement thereto, including
          documents incorporated by reference, to which such holders or their
          legal counsel shall object.

               3.1.5. State Securities Laws Compliance. The Company shall use
          its best efforts to (i) register or qualify the Registrable Securities
          covered by the Registration Statement under such securities or "blue
          sky" laws of such jurisdictions in the United States as the holders of
          Registrable Securities included in such Registration Statement (in
          light of their intended plan of distribution) may request and (ii)
          take such action necessary to cause such Registrable Securities
          covered by the Registration Statement to be registered with or
          approved by such other Governmental Authorities as may be necessary by
          virtue of the business and operations of the Company and do any and
          all other acts and things that may be necessary or advisable to enable
          the holders of Registrable Securities included in such Registration
          Statement to consummate the disposition of such Registrable Securities
          in such jurisdictions; provided, however, that the Company shall not
          be required to qualify generally to do business in any jurisdiction
          where it would not otherwise be required to qualify but for this
          paragraph (e) or subject itself to taxation in any such jurisdiction.

               3.1.6. Agreements for Disposition. The Company shall enter into
          customary agreements (including, if applicable, an underwriting
          agreement in customary form) and take such other actions as are
          reasonably required in order to expedite or facilitate the disposition
          of such Registrable Securities. The representations, warranties and
          covenants of the Company in any underwriting agreement which are made
          to or for the benefit of any Underwriters, to the extent applicable,
          shall also be made to and for the benefit of the holders of
          Registrable Securities included in such registration statement. No
          holder of Registrable Securities included in such registration
          statement shall be required to make any representations or warranties
          in the underwriting agreement except, if applicable, with respect to
          such holder's organization, good standing, authority, title to
          Registrable Securities, lack of conflict of such sale with such
          holder's material agreements and organizational documents, and with
          respect to written information relating to such holder that such
          holder has furnished in writing expressly for inclusion in such
          Registration Statement.

               3.1.7. Cooperation. The principal executive officer of the
          Company, the principal financial officer of the Company, the principal
          accounting officer of the Company and all other officers and members
          of the management of the Company shall cooperate fully in any offering
          of Registrable Securities hereunder, which cooperation shall include,
          without limitation, the preparation of the Registration Statement with
          respect to such offering and all other offering materials and related
          documents, and participation in meetings with Underwriters, attorneys,
          accountants and potential investors.

               3.1.8. Records. The Company shall make available for inspection
          by the holders of Registrable Securities included in such Registration
          Statement, any Underwriter participating in any disposition pursuant
          to such registration statement and any attorney, accountant or other
          professional retained by any holder of Registrable Securities included
          in such Registration Statement or any Underwriter, all financial and
          other records, pertinent corporate documents and properties of the
          Company, as shall be necessary to enable them to exercise their due
          diligence responsibility, and cause the Company's officers, directors
          and employees to supply all information requested by any of them in
          connection with such Registration Statement.

               3.1.9. Opinions and Comfort Letters. The Company shall furnish to
          each holder of Registrable Securities included in any Registration
          Statement a signed counterpart, addressed to such holder, of (i) any
          opinion of counsel to the Company delivered to any Underwriter and
          (ii) any comfort letter from the Company's independent public
          accountants delivered to any Underwriter. In the event no legal
          opinion is delivered to any Underwriter, the Company shall furnish to
          each holder of Registrable Securities included in such Registration
          Statement, at any time that such holder elects to use a prospectus, an
          opinion of counsel to the Company to the effect that the Registration
          Statement containing such prospectus has been declared effective and
          that no stop order is in effect.

               3.1.10. Earnings Statement. The Company shall comply with all
          applicable rules and regulations of the Commission and the Securities
          Act, and make available to its stockholders, as soon as practicable,
          an earnings statement covering a period of twelve (12) months,
          beginning within three (3) months after the effective date of the
          registration statement, which earnings statement shall satisfy the
          provisions of Section 11(a) of the Securities Act and Rule 158
          thereunder.

               3.1.11. Listing. The Company shall use its best efforts to cause
          all Registrable Securities included in any registration to be listed
          on such exchanges or otherwise designated for trading in the same
          manner as similar securities issued by the Company are then listed or
          designated or, if no such similar securities are then listed or
          designated, in a manner satisfactory to the holders of a majority of
          the Registrable Securities included in such registration.

          3.2 Obligation to Suspend Distribution. Upon receipt of any notice
     from the Company of the happening of any event of the kind described in
     Section 3.1.4(iv), or, in the case of a resale registration on Form S-3
     pursuant to Section 2.3 hereof, upon any suspension by the Company,
     pursuant to a written insider trading compliance program adopted by the
     Company's Board of Directors, of the ability of all "insiders" covered by
     such program to transact in the Company's securities because of the
     existence of material non-public information, each holder of Registrable
     Securities included in any registration shall immediately discontinue
     disposition of such Registrable Securities pursuant to the Registration
     Statement covering such Registrable Securities until such holder receives
     the supplemented or amended prospectus contemplated by Section 3.1.4(iv) or
     the restriction on the ability of "insiders" to transact in the Company's
     securities is removed, as applicable, and, if so directed by the Company,
     each such holder will deliver to the Company all copies, other than
     permanent file copies then in such holder's possession, of the most recent
     prospectus covering such Registrable Securities at the time of receipt of
     such notice.

          3.3 Registration Expenses. The Company shall bear all costs and
     expenses incurred in connection with any Demand Registration pursuant to
     Section 2.1, any Piggy-Back Registration pursuant to Section 2.2, and any
     registration on Form S-3 effected pursuant to Section 2.3, and all expenses
     incurred in performing or complying with its other obligations under this
     Agreement, whether or not the Registration Statement becomes effective,
     including, without limitation: (i) all registration and filing fees; (ii)
     fees and expenses of compliance with securities or "blue sky" laws
     (including fees and disbursements of counsel in connection with blue sky
     qualifications of the Registrable Securities); (iii) printing expenses;
     (iv) the Company's internal expenses (including, without limitation, all
     salaries and expenses of its officers and employees); (v) the fees and
     expenses incurred in connection with the listing of the Registrable
     Securities as required by Section 3.1.11; (vi) National Association of
     Securities Dealers, Inc. fees; (vii) fees and disbursements of counsel for
     the Company and fees and expenses for independent certified public
     accountants retained by the Company (including the expenses or costs
     associated with the delivery of any opinions or comfort letters requested
     pursuant to Section 3.1.9); (viii) the fees and expenses of any special
     experts retained by the Company in connection with such registration and
     (ix) the fees and expenses of one legal counsel selected by the holders of
     a majority-in-interest of the Registrable Securities included in such
     registration. The Company shall have no obligation to pay any underwriting
     discounts or selling commissions attributable to the Registrable Securities
     being sold by the holders thereof, which underwriting discounts or selling
     commissions shall be borne by such holders. Additionally, in an
     underwritten offering, all selling stockholders and the Company shall bear
     the expenses of the underwriter pro rata in proportion to the respective
     amount of shares each is selling in such offering.

          3.4 Information. The holders of Registrable Securities shall provide
     such information as may reasonably be requested by the Company, or the
     managing Underwriter, if any, in connection with the preparation of any
     Registration Statement, including amendments and supplements thereto, in
     order to effect the registration of any Registrable Securities under the
     Securities Act pursuant to Section 2 and in connection with the Company's
     obligation to comply with federal and applicable state securities laws.

     4. INDEMNIFICATION AND CONTRIBUTION.

          4.1 Indemnification by the Company. The Company agrees to indemnify
     and hold harmless each Investor and each other holder of Registrable
     Securities, and each of their respective officers, employees, affiliates,
     directors, partners, members, attorneys and agents, and each person, if
     any, who controls an Investor and each other holder of Registrable
     Securities (within the meaning of Section 15 of the Securities Act or
     Section 20 of the Exchange Act) (each, an "Investor Indemnified Party"),
     from and against any expenses, losses, judgments, claims, damages or
     liabilities, whether joint or several, arising out of or based upon any
     untrue statement (or allegedly untrue statement) of a material fact
     contained in any Registration Statement under which the sale of such
     Registrable Securities was registered under the Securities Act, any
     preliminary prospectus, final prospectus or summary prospectus contained in
     the Registration Statement, or any amendment or supplement to such
     Registration Statement, or arising out of or based upon any omission (or
     alleged omission) to state a material fact required to be stated therein or
     necessary to make the statements therein not misleading, or any violation
     by the Company of the Securities Act or any rule or regulation promulgated
     thereunder applicable to the Company and relating to action or inaction
     required of the Company in connection with any such registration; and the
     Company shall promptly reimburse the Investor Indemnified Party for any
     legal and any other expenses reasonably incurred by such Investor
     Indemnified Party in connection with investigating and defending any such
     expense, loss, judgment, claim, damage, liability or action; provided,
     however, that the Company will not be liable in any such case to the extent
     that any such expense, loss, claim, damage or liability arises out of or is
     based upon any untrue statement or allegedly untrue statement or omission
     or alleged omission made in such Registration Statement, preliminary
     prospectus, final prospectus, or summary prospectus, or any such amendment
     or supplement, in reliance upon and in conformity with information
     furnished to the Company, in writing, by such selling holder expressly for
     use therein. The Company also shall indemnify any Underwriter of the
     Registrable Securities, their officers, affiliates, directors, partners,
     members and agents and each person who controls such Underwriter on
     substantially the same basis as that of the indemnification provided above
     in this Section 4.1.

          4.2 Indemnification by Holders of Registrable Securities. Each selling
     holder of Registrable Securities will, in the event that any registration
     is being effected under the Securities Act pursuant to this Agreement of
     any Registrable Securities held by such selling holder, indemnify and hold
     harmless the Company, each of its directors and officers and each
     underwriter (if any), and each other person, if any, who controls such
     selling holder or such underwriter within the meaning of the Securities
     Act, against any losses, claims, judgments, damages or liabilities, whether
     joint or several, insofar as such losses, claims, judgments, damages or
     liabilities (or actions in respect thereof) arise out of or are based upon
     any untrue statement or allegedly untrue statement of a material fact
     contained in any Registration Statement under which the sale of such
     Registrable Securities was registered under the Securities Act, any
     preliminary prospectus, final prospectus or summary prospectus contained in
     the Registration Statement, or any amendment or supplement to the
     Registration Statement, or arise out of or are based upon any omission or
     the alleged omission to state a material fact required to be stated therein
     or necessary to make the statement therein not misleading, if the statement
     or omission was made in reliance upon and in conformity with information
     furnished in writing to the Company by such selling holder expressly for
     use therein, and shall reimburse the Company, its directors and officers,
     and each such controlling person for any legal or other expenses reasonably
     incurred by any of them in connection with investigation or defending any
     such loss, claim, damage, liability or action. Each selling holder's
     indemnification obligations hereunder shall be several and not joint and
     shall be limited to the amount of any net proceeds actually received by
     such selling holder.

          4.3 Conduct of Indemnification Proceedings. Promptly after receipt by
     any person of any notice of any loss, claim, damage or liability or any
     action in respect of which indemnity may be sought pursuant to Section 4.1
     or 4.2, such person (the "Indemnified Party") shall, if a claim in respect
     thereof is to be made against any other person for indemnification
     hereunder, notify such other person (the "Indemnifying Party") in writing
     of the loss, claim, judgment, damage, liability or action; provided,
     however, that the failure by the Indemnified Party to notify the
     Indemnifying Party shall not relieve the Indemnifying Party from any
     liability which the Indemnifying Party may have to such Indemnified Party
     hereunder, except and solely to the extent the Indemnifying Party is
     actually prejudiced by such failure. If the Indemnified Party is seeking
     indemnification with respect to any claim or action brought against the
     Indemnified Party, then the Indemnifying Party shall be entitled to
     participate in such claim or action, and, to the extent that it wishes,
     jointly with all other Indemnifying Parties, to assume control of the
     defense thereof with counsel satisfactory to the Indemnified Party. After
     notice from the Indemnifying Party to the Indemnified Party of its election
     to assume control of the defense of such claim or action, the Indemnifying
     Party shall not be liable to the Indemnified Party for any legal or other
     expenses subsequently incurred by the Indemnified Party in connection with
     the defense thereof other than reasonable costs of investigation; provided,
     however, that in any action in which both the Indemnified Party and the
     Indemnifying Party are named as defendants, the Indemnified Party shall
     have the right to employ separate counsel (but no more than one such
     separate counsel) to represent the Indemnified Party and its controlling
     persons who may be subject to liability arising out of any claim in respect
     of which indemnity may be sought by the Indemnified Party against the
     Indemnifying Party, with the fees and expenses of such counsel to be paid
     by such Indemnifying Party if, based upon the written opinion of counsel of
     such Indemnified Party, representation of both parties by the same counsel
     would be inappropriate due to actual or potential differing interests
     between them. No Indemnifying Party shall, without the prior written
     consent of the Indemnified Party, consent to entry of judgment or effect
     any settlement of any claim or pending or threatened proceeding in respect
     of which the Indemnified Party is or could have been a party and indemnity
     could have been sought hereunder by such Indemnified Party, unless such
     judgment or settlement includes an unconditional release of such
     Indemnified Party from all liability arising out of such claim or
     proceeding.

          4.4 Contribution.

               4.4.1. If the indemnification provided for in the foregoing
          Sections 4.1, 4.2 and 4.3 is unavailable to any Indemnified Party in
          respect of any loss, claim, damage, liability or action referred to
          herein, then each such Indemnifying Party, in lieu of indemnifying
          such Indemnified Party, shall contribute to the amount paid or payable
          by such Indemnified Party as a result of such loss, claim, damage,
          liability or action in such proportion as is appropriate to reflect
          the relative fault of the Indemnified Parties and the Indemnifying
          Parties in connection with the actions or omissions which resulted in
          such loss, claim, damage, liability or action, as well as any other
          relevant equitable considerations. The relative fault of any
          Indemnified Party and any Indemnifying Party shall be determined by
          reference to, among other things, whether the untrue or alleged untrue
          statement of a material fact or the omission or alleged omission to
          state a material fact relates to information supplied by such
          Indemnified Party or such Indemnifying Party and the parties' relative
          intent, knowledge, access to information and opportunity to correct or
          prevent such statement or omission.

               4.4.2. The parties hereto agree that it would not be just and
          equitable if contribution pursuant to this Section 4.4 were determined
          by pro rata allocation or by any other method of allocation which does
          not take account of the equitable considerations referred to in the
          immediately preceding Section 4.4.1. The amount paid or payable by an
          Indemnified Party as a result of any loss, claim, damage, liability or
          action referred to in the immediately preceding paragraph shall be
          deemed to include, subject to the limitations set forth above, any
          legal or other expenses incurred by such Indemnified Party in
          connection with investigating or defending any such action or claim.
          Notwithstanding the provisions of this Section 4.4, no holder of
          Registrable Securities shall be required to contribute any amount in
          excess of the dollar amount of the net proceeds (after payment of any
          underwriting fees, discounts, commissions or taxes) actually received
          by such holder from the sale of Registrable Securities which gave rise
          to such contribution obligation. No person guilty of fraudulent
          misrepresentation (within the meaning of Section 11(f) of the
          Securities Act) shall be entitled to contribution from any person who
          was not guilty of such fraudulent misrepresentation.

     5. UNDERWRITING AND DISTRIBUTION.

          5.1 Rule 144. The Company covenants that it shall file any reports
     required to be filed by it under the Securities Act and the Exchange Act
     and shall take such further action as the holders of Registrable Securities
     may reasonably request, all to the extent required from time to time to
     enable such holders to sell Registrable Securities without registration
     under the Securities Act within the limitation of the exemptions provided
     by Rule 144 under the Securities Act, as such Rules may be amended from
     time to time, or any similar Rule or regulation hereafter adopted by the
     Commission.

     6. MISCELLANEOUS.

          6.1 Other Registration Rights. The Company represents and warrants
     that, except as disclosed to Investors in the Agreement and Plan of Merger,
     dated October __, 2005, pursuant to which the Merger was effected, no
     person, other than a holder of the Registrable Securities, has any right to
     require the Company to register any shares of the Company's capital stock
     for sale or to include shares of the Company's capital stock in any
     registration filed by the Company for the sale of shares of capital stock
     for its own account or for the account of any other person.

          6.2 Assignment; No Third Party Beneficiaries. This Agreement and the
     rights, duties and obligations of the Company hereunder may not be assigned
     or delegated by the Company in whole or in part. This Agreement and the
     rights, duties and obligations of the holders of Registrable Securities
     hereunder may be freely assigned or delegated by such holder of Registrable
     Securities in conjunction with and to the extent of any transfer of
     Registrable Securities by any such holder. This Agreement and the
     provisions hereof shall be binding upon and shall inure to the benefit of
     each of the parties and their respective successors and the permitted
     assigns of the Investor or holder of Registrable Securities or of any
     assignee of the Investor or holder of Registrable Securities. This
     Agreement is not intended to confer any rights or benefits on any persons
     that are not party hereto other than as expressly set forth in Article 4
     and this Section 6.2.

          6.3 Notices. All notices, demands, requests, consents, approvals or
     other communications (collectively, "Notices") required or permitted to be
     given hereunder or which are given with respect to this Agreement shall be
     in writing and shall be personally served, delivered by reputable air
     courier service with charges prepaid, or transmitted by hand delivery,
     telegram, telex or facsimile, addressed as set forth below, or to such
     other address as such party shall have specified most recently by written
     notice. Notice shall be deemed given on the date of service or transmission
     if personally served or transmitted by telegram, telex or facsimile;
     provided, that if such service or transmission is not on a business day or
     is after normal business hours, then such notice shall be deemed given on
     the next business day. Notice otherwise sent as provided herein shall be
     deemed given on the next business day following timely delivery of such
     notice to a reputable air courier service with an order for next-day
     delivery.


                           To the Company:

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

                           with a copy to:

                           Graubard Miller
                           405 Lexington Avenue
                           New York, NY 10174-1901
                           Attention: David Miller

                           To an Investor, to:

                           Larry E. Lee
                           RAM Energy, Inc.
                           5100 E. Skelly Drive
                           Suite 650
                           Tulsa, Oklahoma 74135

                           Danish Knights, A Limited Partnership
                           Attn:  Britani Talley Bowman
                           8620 Berkwick Drive
                           Plano, TX 75025

                           C. David Stinson
                           McAfee & Taft, A Professional Corporation
                           211 North Robinson, 10th Floor
                           Oklahoma City, Oklahoma 73102-7103

                           with a copy to:

                           C. David Stinson
                           McAfee & Taft, A Professional Corporation
                           211 North Robinson, 10th Floor
                           Oklahoma City, Oklahoma 73102-7103

          6.4 Severability. This Agreement shall be deemed severable, and the
     invalidity or unenforceability of any term or provision hereof shall not
     affect the validity or enforceability of this Agreement or of any other
     term or provision hereof. Furthermore, in lieu of any such invalid or
     unenforceable term or provision, the parties hereto intend that there shall
     be added as a part of this Agreement a provision as similar in terms to
     such invalid or unenforceable provision as may be possible and be valid and
     enforceable.

          6.5 Counterparts. This Agreement may be executed in multiple
     counterparts, each of which shall be deemed an original, and all of which
     taken together shall constitute one and the same instrument.

          6.6 Entire Agreement. This Agreement (including all agreements entered
     into pursuant hereto and all certificates and instruments delivered
     pursuant hereto and thereto) constitute the entire agreement of the parties
     with respect to the subject matter hereof and supersede all prior and
     contemporaneous agreements, representations, understandings, negotiations
     and discussions between the parties, whether oral or written.

          6.7 Modifications and Amendments. No amendment, modification or
     termination of this Agreement shall be binding upon any party unless
     executed in writing by such party.

          6.8 Titles and Headings. Titles and headings of sections of this
     Agreement are for convenience only and shall not affect the construction of
     any provision of this Agreement.

          6.9 Waivers and Extensions. Any party to this Agreement may waive any
     right, breach or default which such party has the right to waive, provided
     that such waiver will not be effective against the waiving party unless it
     is in writing, is signed by such party, and specifically refers to this
     Agreement. Waivers may be made in advance or after the right waived has
     arisen or the breach or default waived has occurred. Any waiver may be
     conditional. No waiver of any breach of any agreement or provision herein
     contained shall be deemed a waiver of any preceding or succeeding breach
     thereof nor of any other agreement or provision herein contained. No waiver
     or extension of time for performance of any obligations or acts shall be
     deemed a waiver or extension of the time for performance of any other
     obligations or acts.

          6.10 Remedies Cumulative. In the event that the Company fails to
     observe or perform any covenant or agreement to be observed or performed
     under this Agreement, the Investor or any other holder of Registrable
     Securities may proceed to protect and enforce its rights by suit in equity
     or action at law, whether for specific performance of any term contained in
     this Agreement or for an injunction against the breach of any such term or
     in aid of the exercise of any power granted in this Agreement or to enforce
     any other legal or equitable right, or to take any one or more of such
     actions, without being required to post a bond. None of the rights, powers
     or remedies conferred under this Agreement shall be mutually exclusive, and
     each such right, power or remedy shall be cumulative and in addition to any
     other right, power or remedy, whether conferred by this Agreement or now or
     hereafter available at law, in equity, by statute or otherwise.

          6.11 Governing Law. This Agreement shall be governed by, interpreted
     under, and construed in accordance with the law of the State of Delaware,
     without giving effect to any choice-of-law provisions thereof that would
     compel the application of the substantive laws of any other jurisdiction.

          6.12 Waiver of Trial by Jury. Each party hereby irrevocably and
     unconditionally waives the right to a trial by jury in any action, suit,
     counterclaim or other proceeding (whether based on contract, tort or
     otherwise) arising out of, connected with or relating to this Agreement,
     the transactions contemplated hereby, or the actions of the Investor in the
     negotiation, administration, performance or enforcement hereof.


              [THE REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK.]



     IN WITNESS WHEREOF, the parties have caused this Registration Rights
Agreement to be executed and delivered by their duly authorized representatives
as of the date first written above.

                                   TREMISIS ENERGY
                                   ACQUISITION CORPORATION


                                   By: /s/ Lawrence S. Coben
                                   Name:   Lawrence S. Coben
                                   Title:   Chairman of the Board


                                   INVESTORS:


                                   /s/ Larry E. Lee
                                       Larry E. Lee


                                   DANISH KNIGHTS, A LIMITED PARTNERSHIP,
                                   A Texas Limited Partnership

                                   By:  Dannebrog Corporation, General Partner


                                   By:  /s/ Britani Talley Bowman
                                            Britani Talley Bowman, President


                                        /s/ C. David Stinson
                                            C. David Stinson