FORM OF INDEMNIFICATION AGREEMENT

Exhibit 10.15

FORM OF INDEMNIFICATION AGREEMENT

     This Indemnification Agreement (“ Agreement ”) is made as of                      , 200___by and between Catalytica Energy Systems, Inc., a Delaware corporation (the “ Company ”), and                      (“ Indemnitee ”).

RECITALS

     WHEREAS, the Company desires to attract and retain the services of highly qualified individuals, such as Indemnitee, to serve the Company;

     WHEREAS, in order to induce Indemnitee to continue to provide services to the Company, the Company wishes to provide for the indemnification of, and advancement of expenses to, Indemnitee to the maximum extent permitted by law;

     WHEREAS, the Amended and Restated Certificate of Incorporation (the “ Charter ”) and the bylaws of the Company require (i) indemnification of the officers and directors of the Company to the fullest extent authorized by the General Corporation Law of the State of Delaware (the “ DGCL ”) and (ii) the advancement of expenses (including legal fees) incurred in any proceeding for which indemnification is available in advance of such proceedings final disposition.

     WHEREAS, the Charter and the DGCL expressly provide that the indemnification provisions set forth therein are not exclusive and thereby contemplate that contracts may be entered into between the Company and members of the board of directors, officers and other persons with respect to indemnification;

     WHEREAS, the Company and Indemnitee recognize the continued difficulty in obtaining liability insurance for the Company’s directors, officers, employees, agents and fiduciaries, the significant and continual increases in the cost of such insurance and the general trend of insurance companies to reduce the scope of coverage of such insurance;

     WHEREAS, the Company and Indemnitee further recognize the substantial increase in corporate litigation in general, subjecting directors, officers, employees, agents and fiduciaries to expensive litigation risks at the same time as the availability and scope of coverage of liability insurance provide increasing challenges for the Company;

     WHEREAS, Indemnitee does not regard the protection currently provided by applicable law, the Company’s governing documents and available insurance as adequate under the present circumstances, and the Indemnitee and certain other directors, officers, employees, agents and fiduciaries of the Company may not be willing to continue to serve in such capacities without additional protection;

     WHEREAS, the Board of Directors of the Company (the “ Board ”) has determined that the increased difficulty in attracting and retaining highly qualified persons such as Indemnitee is

detrimental to the best interests of the Company’s stockholders and that the Company should act to assure such persons that there will be increased certainty of such protection in the future;

     WHEREAS, it is reasonable, prudent and necessary for the Company contractually to obligate itself to indemnify, and to advance expenses on behalf of, such persons to the fullest extent permitted by applicable law so that they will serve or continue to serve the Company free from undue concern that they will not be so indemnified; and

     WHEREAS, this Agreement is a supplement to and in furtherance of the indemnification provided in the Charter and any resolutions adopted pursuant thereto, and shall not be deemed a substitute therefor, nor to diminish or abrogate any rights of Indemnitee thereunder.

     NOW, THEREFORE, in consideration of the premises and the covenants contained herein, the Company and Indemnitee do hereby covenant and agree as follows:

     Section 1. Services to the Company . Indemnitee agrees to serve as a director of the Company. Indemnitee may at any time and for any reason resign from such position (subject to any other contractual obligation or any obligation imposed by operation of law), in which event the Company shall have no obligation under this Agreement to continue Indemnitee in such position. This Agreement shall not be deemed an employment contract between the Company (or any of its subsidiaries or any Enterprise) and Indemnitee. The foregoing notwithstanding, this Agreement shall continue in force after Indemnitee has ceased to serve as a director of the Company for the applicable time period set forth in Section 15 hereto.

     Section 2. Definitions .

     As used in this Agreement:

          (a) “ Corporate Status ” describes the status of a person who is or was a director, officer, employee or agent of the Company or of any other corporation, partnership or joint venture, trust, employee benefit plan or other enterprise which such person is or was serving at the request of the Company.

          (b) “ Enterprise ” shall mean the Company and any other corporation, partnership, joint venture, trust, employee benefit plan or other enterprise of which Indemnitee is or was serving at the request of the Company as a director, officer, employee, agent or fiduciary.

          (c) “ Expenses ” shall include all reasonable attorneys’ fees, retainers, court costs, transcript costs, fees of experts, witness fees, travel expenses, duplicating costs, printing and binding costs, telephone charges, postage, delivery service fees, and all other disbursements or expenses of the types customarily incurred in connection with prosecuting, defending, preparing to prosecute or defend, investigating, being or preparing to be a witness in, or otherwise participating in, a Proceeding. Expenses also shall include Expenses incurred in connection with any appeal resulting from any Proceeding, including without limitation the premium, security for, and other costs relating to any cost bond, supersedeas bond, or other appeal bond or its equivalent. Expenses, however , shall not include amounts paid in settlement by Indemnitee or the amount of judgments or fines against Indemnitee.

          (d) “ Independent Counsel ” means a law firm, or a partner (or, if applicable, a member) of such a law firm, that is experienced in matters of corporation law and neither presently is, nor in the past five years has been, retained to represent: (i) the Company or Indemnitee in any matter material to either such party (other than with respect to matters concerning the Indemnitee under this Agreement or other indemnitees under similar indemnification agreements), or (ii) any other party to the Proceeding giving rise to a claim for indemnification hereunder. Notwithstanding the foregoing, the term “Independent Counsel” shall not include any person who, under the applicable standards of professional conduct then prevailing, would have a conflict of interest in representing either the Company or Indemnitee in an action to determine Indemnitee’s rights under this Agreement. The Company agrees to pay the reasonable legal fees and related expenses of the Independent Counsel referred to above arising out of or relating to this Agreement or its engagement pursuant hereto.

          (e) The term “Proceeding” shall include any threatened, pending or completed action, suit, arbitration, alternate dispute resolution mechanism, investigation, inquiry, administrative hearing or any other actual, threatened or completed proceeding, whether brought in the right of the Company or otherwise and whether of a civil, criminal, administrative or investigative nature, in which Indemnitee was, is or will be involved as a party or otherwise by reason of the fact that Indemnitee is or was a director of the Company, by reason of any action taken by him or her or of any action on his or her part while acting as director of the Company, or by reason of the fact that he or she is or was serving at the request of the Company as a director, officer, employee or agent of another corporation, partnership, joint venture, trust, employee benefit plan or other enterprise, in each case whether or not serving in such capacity at the time any liability or expense is incurred for which indemnification, reimbursement, or advancement of expenses can be provided under this Agreement; provided , however , that the term “Proceeding” shall not include any action, suit or arbitration initiated by Indemnitee to enforce Indemnitee’s rights under this Agreement.

     Section 3. Indemnity in Third-Party Proceedings . The Company shall indemnify Indemnitee in accordance with the provisions of this Section 3 if Indemnitee is, or is threatened to be made, a party to or a participant in any Proceeding other than a Proceeding by or in the right of the Company to procure a judgment in its favor. Pursuant to this Section 3, Indemnitee shall be indemnified against all Expenses, judgments, fines and amounts paid in settlement actually and reasonably incurred by Indemnitee or on his or her behalf in connection with such Proceeding or any claim, issue or matter therein, if Indemnitee acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the best interests of the Company and, in the case of a criminal proceeding, had no reasonable cause to believe that his or her conduct was unlawful. Indemnitee shall not enter into any settlement in connection with a Proceeding without (a) thirty (30) days prior notice to the Company and (b) the Company’s prior written consent to the terms of such settlement, which consent shall not be unreasonably withheld.

     Section 4. Indemnity in Proceedings by or in the Right of the Company . The Company shall indemnify Indemnitee in accordance with the provisions of this Section 4 if Indemnitee is, or is threatened to be made, a party to or a participant in any Proceeding by or in the right of the Company to procure a judgment in its favor. Pursuant to this Section 4, Indemnitee shall be indemnified against all Expenses actually and reasonably incurred by him or her or on his or her behalf in connection with such Proceeding or any claim, issue or matter therein, if Indemnitee acted

in good faith and in a manner he or she reasonably believed to be in or not opposed to the best interests of the Company. No indemnification for Expenses shall be made under this Section 4 in respect of any claim, issue or matter as to which Indemnitee shall have been finally adjudged by a court to be liable to the Company, unless and only to the extent that the Delaware Court of Chancery (the “ Delaware Court ”) or any court in which the Proceeding was brought shall determine upon application that, despite the adjudication of liability but in view of all the circumstances of the case, Indemnitee is fairly and reasonably entitled to indemnification for such expenses as the Delaware Court or such other court shall deem proper.

     Section 5. Indemnification for Expenses of a Party Who is Wholly or Partly Successful . Notwithstanding any other provisions of this Agreement, to the extent that Indemnitee is a party to or a participant in and is successful, on the merits or otherwise, in any Proceeding or in defense of any claim, issue or matter therein, in whole or in part, the Company shall indemnify Indemnitee against all Expenses actually and reasonably incurred by him or her in connection therewith. If Indemnitee is not wholly successful in such Proceeding but is successful, on the merits or otherwise, as to one or more but less than all claims, issues or matters in such Proceeding, the Company shall indemnify Indemnitee against (a) all Expenses actually and reasonably incurred by him or her or on his or her behalf in connection with each successfully resolved claim, issue or matter and (b) any claim, issue or matter related to any such successfully resolved claim, issue or matter. For purposes of this Section and without limitation, the termination of any claim, issue or matter in such a Proceeding by dismissal, with or without prejudice, shall be deemed to be a successful result as to such claim, issue or matter.

     Section 6. Indemnification for Expenses of a Witness . Notwithstanding any other provision of this Agreement, to the extent that Indemnitee is, by reason of his or her Corporate Status, a witness in any Proceeding to which Indemnitee is not a party, he or she shall be indemnified against all Expenses actually and reasonably incurred by him or her or on his or her behalf in connection therewith.

     Section 7. Additional Indemnification .

          (a) Notwithstanding any limitation in Sections 3, 4, or 5 hereof, the Company shall indemnify Indemnitee to the fullest extent permitted by law if Indemnitee is, or is threatened to be made, a party to any Proceeding (including a Proceeding by or in the right of the Company to procure a judgment in its favor) against all Expenses, judgments, fines and amounts paid in settlement actually and reasonably incurred by Indemnitee in connection with the Proceeding.

          (b) For purposes of Section 7(a), the meaning of the phrase “to the fullest extent permitted by law” shall include, but not be limited to:

               (i) to the fullest extent permitted by the provision of the DGCL that authorizes or contemplates additional indemnification by agreement, or the corresponding provision of any amendment to or replacement of the DGCL or such provision thereof; and

               (ii) to the fullest extent authorized or permitted by any amendments to or replacements of the DGCL adopted after the date of this Agreement that increase the extent to which a corporation may indemnify its officers and directors.

     Section 8. Exclusions . Notwithstanding any provision in this Agreement to the contrary, the Company shall not be obligated under this Agreement to make any indemnity in connection with:

          (a) any claim made against Indemnitee for which payment has actually been made to or on behalf of Indemnitee under any insurance policy or other indemnity provision, except with respect to any excess beyond the amount paid under any insurance policy or other indemnity provision;

          (b) any claim made against Indemnitee for an accounting of profits made from the purchase and sale (or sale and purchase) by Indemnitee of securities of the Company within the meaning of Section 16(b) of the Securities Exchange Act of 1934, as amended, or similar provisions of state statutory law or common law;

          (c) any claim made against Indemnitee for which payment is prohibited by applicable law; or

          (d) any claim initiated or brought voluntarily by Indemnitee and not by way of defense, except (i) with respect to actions or proceedings brought to establish or enforce a right to receive an advance of Expenses or indemnification of any amounts under this Agreement or any other agreement or insurance policy or under the Charter or bylaws of the Company now or hereafter in effect relating to indemnification and the advancement of Expenses, (ii) in specific cases if the Board has approved the initiation or bringing of such claim, or (iii) as otherwise required under the DGCL.

     Section 9. Advances of Expenses . The Company shall advance, to the extent not prohibited by applicable law, the Expenses incurred by Indemnitee in connection with any Proceeding, and such advancement shall be made within thirty (30) days after the receipt by the Company of a statement or statements requesting such advances (which shall include invoices received by Indemnitee in connection with such Expenses; provided , however . that , in the case of invoices in connection with legal services, any references to legal work performed or to expenditures made that would cause Indemnitee to waive any privilege accorded by applicable law shall not be included with the invoice) from time to time, whether prior to or after final disposition of any Proceeding. Advances shall be unsecured and interest free. Advances shall be made without regard to Indemnitee’s ability to repay the expenses and without regard to I