The Board of Directors of Tremisis Energy Acquisition Corporation II has adopted this code of ethics (the “Code”), which is applicable to all directors, officers and employees, to:

promote honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships;

promote the full, fair, accurate, timely and understandable disclosure in reports and documents that the Company files with, or submits to, the Securities and Exchange Commission (the “SEC”), as well as in other public communications made by or on behalf of the Company;

This Code may be amended only by resolution of the Company’s Board of Directors. In this Code, references to the “Company” means Tremisis Energy Acquisition Corporation II (the “Parent”) and, in appropriate context, the Parent’s subsidiaries.

Each person owes a duty to the Company to act with integrity. Integrity requires, among other things, being honest, fair and candid. Deceit, dishonesty and subordination of principle are inconsistent with integrity. Service to the Company never should be subordinated to personal gain and advantage.

Act with integrity, including being honest and candid while still maintaining the confidentiality of the Company’s information where required or in the Company’s interests.

Comply with the requirements of applicable accounting and auditing standards, as well as Company policies, in order to maintain a high standard of accuracy and completeness in the Company’s financial records and other business-related information and data.

Adhere to a high standard of business ethics and not seek competitive advantage through unlawful or unethical business practices.

Refrain from taking advantage of anyone through manipulation, concealment, abuse of privileged information, misrepresentation of material facts or any other unfair-dealing practice.

Refrain from taking for themselves personally opportunities that are discovered through the use of corporate assets or using corporate assets, information or position for general personal gain outside the scope of employment with the Company.

Avoid conflicts of interest, wherever possible, except under guidelines or resolutions approved by the Board of Directors (or the appropriate committee of the Board). Anything that would be a conflict for a person subject to this Code also will be a conflict if it is related to a member of his or her family or a close relative. Examples of conflict of interest situations include, but are not limited to, the following:

any outside business activity that detracts from an individual’s ability to devote appropriate time and attention to his or her responsibilities with the Company;

the receipt of any money, non-nominal gifts or excessive entertainment from any company with which the Company has current or prospective business dealings;

being in the position of supervising, reviewing or having any influence on the job evaluation, pay or benefit of any close relative;

selling anything to the Company or buying anything from the Company, except on the same terms and conditions as comparable officers or directors are permitted to so purchase or sell; and

any other circumstance, event, relationship or situation in which the personal interest of a person subject to this Code interferes - or even appears to interfere - with the interests of the Company as a whole.

The Company strives to ensure that the contents of and the disclosures in the reports and documents that the Company files with the SEC and other public communications shall be full, fair, accurate, timely and understandable in accordance with applicable disclosure standards, including standards of materiality, where appropriate. Each person must:

not knowingly misrepresent, or cause others to misrepresent, facts about the Company to others, whether within or outside the Company, including to the Company’s independent auditors, governmental regulators, self-regulating organizations and other governmental officials, as appropriate; and

in relation to his or her area of responsibility, properly review and critically analyze proposed disclosure for accuracy and completeness.

In addition to the foregoing, the Chief Executive Officer and Chief Financial Officer of the Parent and each subsidiary of Parent (or persons performing similar functions), and each other person that typically is involved in the financial reporting of the Company must familiarize himself or herself with the disclosure requirements applicable to the Company as well as the business and financial operations of the Company.

Each person must promptly bring to the attention of the Chairman of the Audit Committee of Parent’s Board of Directors (or the Chairman of the Parent’s Board of Directors if no Audit Committee exists) any information he or she may have concerning (a) significant deficiencies in the design or operation of internal and/or disclosure controls which could adversely affect the Company’s ability to record, process, summarize and report financial data or (b) any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s financial reporting, disclosures or internal controls.

It is the Company’s obligation and policy to comply with all applicable governmental laws, rules and regulations. It is the personal responsibility of each person to, and each person must, adhere to the standards and restrictions imposed by those laws, rules and regulations, including those relating to accounting and auditing matters.

The Board of Directors or Audit Committee, if one exists, of the Parent is responsible for applying this Code to specific situations in which questions are presented to it and has the authority to interpret this Code in any particular situation. Any person who becomes aware of any existing or potential breach of this Code is required to notify the Chairman of the Board of Directors or Audit Committee promptly. Failure to do so is itself a breach of this Code.

The Board of Directors or Audit Committee, if one exists, will take all appropriate action to investigate any breaches reported to it.

If the Audit Committee, if one exists, determines (by majority decision) that a breach has occurred, it will inform the Board of Directors.

Upon being notified that a breach has occurred, the Board (by majority decision) will take or authorize such disciplinary or preventive action as it deems appropriate, after consultation with the Audit Committee (if one exists) and/or General Counsel, up to and including dismissal or, in the event of criminal or other serious violations of law, notification of the SEC or other appropriate law enforcement authorities.

No person following the above procedure shall, as a result of following such procedure, be subject by the Company or any officer or employee thereof to discharge, demotion suspension, threat, harassment or, in any manner, discrimination against such person in terms and conditions of employment.

Any waiver (defined below) or an implicit waiver (defined below) from a provision of this Code for the principal executive officer, principal financial officer, principal accounting officer or controller, and persons performing similar functions or any amendment (as defined below) to this Code is required to be disclosed in the Company’s Annual Report on Form 10-K or in a Current Report on Form 8-K filed with the SEC.

A “waiver” means the approval by the Company’s Board of Directors of a material departure from a provision of the Code. An “implicit waiver” means the Company’s failure to take action within a reasonable period of time regarding a material departure from a provision of the Code that has been made known to an executive officer of the Company. An “amendment” means any amendment to this Code other than minor technical, administrative or other non-substantive amendments hereto.

All persons should note that it is not the Company’s intention to grant or to permit waivers from the requirements of this Code. The Company expects full compliance with this Code.

Any other policy or procedure set out by the Company in writing or made generally known to employees, officers or directors of the Company prior to the date hereof or hereafter are separate requirements and remain in full force and effect.

All inquiries and questions in relation to this Code or its applicability to particular people or situations should be addressed to the Parent’s Secretary.