Employment Agreement

This Employment Agreement (the " Agreement ") is made and entered into as of December 1, 2016, by and between David Garrison (the " Executive ") and Tecogen, Inc., a Delaware corporation (the " Company ").

WHEREAS, the Company desires to employ the Executive on the terms and conditions set forth herein from the Effective Date until the completion of a merger between it and American DG Energy (the “ Merger ”); and

WHEREAS, the Executive desires to be employed by the Company on such terms and conditions until the completion of the merger.

NOW, THEREFORE, in consideration of the mutual covenants, promises, and obligations set forth herein, the parties agree as follows:

1. Term . The Executive's employment hereunder shall be effective as the date this agreement is signed (the " Effective Date ") and shall continue until the Merger is completed. The Company and Executive hereby agree and acknowledge that for the purposes of this Agreement, the Merger is complete when under Delaware law, American DG Energy Inc. becomes a wholly owned subsidiary of the Company. The period during which the Executive is employed by the Company hereunder is hereinafter referred to as the " Employment Term. "

2. Position and Duties .

2.1     Position . During the Employment Term, the Executive shall serve as the Chief Financial Officer, Treasurer and Corporate Secretary of the Company, reporting to John N. Hatsopoulos, Benjamin Locke, and Robert Panora (“ Supervisors ”). In such position, the Executive shall have such duties, authority, and responsibility customary for such role and as shall be determined from time to time by the Supervisors.. The Executive shall serve as a director or officer of any affiliate of the Company for no additional compensation.

2.2     Duties . During the Employment Term, the Executive shall devote substantially all of his business time and attention to the performance of the Executive's duties hereunder and will not engage in any other business, profession, or occupation for compensation or otherwise which would conflict or interfere with the performance of such duties

3. Place of Performance . The principal place of Executive's employment shall be 45 First Ave, Waltham, MA currently located in; provided that, the Executive may be required to travel on Company business during the Employment Term.

4. Compensation .

4.1.     Base Salary . The Company shall pay the Executive an annual rate of base salary equal to his base salary with the Company as of the Effective Date in periodic installments in accordance with the Company's customary payroll practices and applicable wage payment laws, but no less frequently than monthly. The Executive's base salary may not be decreased during the Employment Term other than as part of an across-the-board salary reduction that applies in the same manner to all senior executives.

4.2      Equity Awards . During the Employment Term, the Executive shall be eligible to participate in the Tecogen 2006 Stock Option Incentive Plan or any successor plan.

4.3      Fringe Benefits and Perquisites . During the Employment Term, the Executive shall be entitled to fringe benefits and perquisites consistent with the practices of the Company, and to the extent the Company provides similar benefits or perquisites (or both) to similarly situated executives of the Company.

4.4      Employee Benefits . During the Employment Term, the Executive shall be entitled to participate in all employee benefit plans, practices, and programs maintained by the Company, as in effect from time to time (collectively, " Employee Benefit Plans "), on a basis which is no less favorable than is provided to other similarly situated executives of the Company, to the extent consistent with applicable law and the terms of the applicable Employee Benefit Plans. The Company reserves the right to amend or cancel any Employee Benefit Plans at any time in its sole discretion, subject to the terms of such Employee Benefit Plan and applicable law.

4.5.      Vacation; Paid Time-Off . During the Employment Term, the Executive shall be entitled to 8 days of paid vacation in accordance with the Company's vacation policies, as in effect from time to time. The Executive shall receive other paid time-off in accordance with the Company's policies for executive officers as such policies may exist from time to time.

4.6.     Business Expenses . The Executive shall be entitled to reimbursement for all reasonable and necessary out-of-pocket business, entertainment, and travel expenses incurred by the Executive in connection with the performance of the Executive's duties hereunder in accordance with the Company's expense reimbursement policies and procedures.

4.7.      Clawback Provisions . Notwithstanding any other provisions in this Agreement to the contrary, any incentive-based compensation, or any other compensation, paid to the Executive pursuant to this Agreement or any other agreement or arrangement with the Company which is subject to recovery under any law, government regulation or stock exchange listing requirement, will be subject to such deductions and clawback as may be required to be made pursuant to such law, government regulation, or stock exchange listing requirement (or any policy adopted by the Company pursuant to any such law, government regulation or stock exchange listing requirement). The Company will make any determination for clawback or recovery in its sole discretion and in accordance with any applicable law or regulation.

5. Termination of Employment . The Employment Term and the Executive's employment hereunder may be terminated by either the Company or the Executive at any time and for any reason; provided that either party shall be required to give the other party at least 14 days advance written notice of any termination of the Executive's employment. This notice requirement shall not apply to termination of the Executive by expiration of the Agreement. Upon termination of the Executive's employment during the Employment Term, the Executive shall be entitled to the compensation and benefits described in this Section 5 and shall have no further rights to any compensation or any other benefits from the Company or any of its affiliates.

5.1. For Cause or Without Good Reason .  

(a) The Executive's employment hereunder may be terminated by the Company for Cause or by the Executive without Good Reason. If the Executive's employment is terminated by the Company for Cause or by the Executive without Good Reason, the Executive shall be entitled to receive:

(i) any accrued but unpaid Base Salary and accrued but unused vacation which shall be paid within two (2) weeks following the Termination Date (as defined below) in accordance with the Company's customary payroll procedures;

(ii) reimbursement for unreimbursed business expenses properly incurred by the Executive, which shall be subject to and paid in accordance with the Company's expense reimbursement policy; and

(iii) such employee benefits (including equity compensation in accordance with the Company’s 2006 Stock Option Plan), if any, to which the Executive may be entitled under the Company's employee benefit plans as of the Termination Date; provided that, in no event shall the Executive be entitled to any payments in the nature of severance or termination payments except as specifically provided herein.

Items 5.1(a)(i) through 5.1(a)(iii) are referred to herein collectively as the " Accrued Amounts ".

(b) For purposes of this Agreement, " Cause " shall mean:

(i) the Executive's failure to perform his duties (other than any such failure resulting from incapacity due to physical or mental illness);

(ii) the Executive's failure to comply with any valid and legal directive of his Supervisors;

(iii) the Executive's engagement in dishonesty, illegal conduct, or misconduct, which is, in each case injurious to the Company or its affiliates;

(iv) the Executive's embezzlement, misappropriation, or fraud, whether or not related to the Executive's employment with the Company;

(v) the Executive's conviction of or plea of guilty or nolo contendere to a crime that constitutes a felony (or state law equivalent) or a crime that constitutes a misdemeanor involving moral turpitude or results in reputational or financial harm to the Company or its affiliates;

(vi) the Executive's violation of a policy of the Company;

(vii) the Executive's unauthorized disclosure of Confidential Information (as defined below);

(viii) the Executives failure to use his best efforts to complete the Merger as soon as possible;

(ix) the Executive's breach of any material obligation under this Agreement or any other written agreement between the Executive and the Company; or

(x) any failure by the Executive to comply with a Supervisors written request during the Employment Term.

Termination of the Executive's employment shall not be deemed to be for Cause unless and until the Company delivers to the Executive a copy of a termination notice signed by each Supervisor.

(c) For purposes of this Agreement, " Good Reason " shall mean the occurrence of any of the following, in each case during the Employment Term without the Executive's written consent:

(i) any material breach by the Company of any material provision of this Agreement or any material provision of any other agreement between the Executive and the Company;

(ii) a material, adverse change in the Executive's title, authority, duties, or responsibilities (other than temporarily while the Executive is physically or mentally incapacitated or as required by applicable law) taking into account the Company's size, status as a public company, and capitalization as of the date of this Agreement; or

(iii) a material adverse change in the reporting structure applicable to the Executive.

The Executive cannot terminate his employment for Good Reason unless he has provided written notice to the Company of the existence of the circumstances providing grounds for termination for Good Reason within 14 days of the initial existence of such grounds and the Company has had at least 7 days from the date on which such notice is provided to cure such circumstances. If the Executive does not terminate his employment for Good Reason within 14 days after the first occurrence of the applicable grounds, then the Executive will be deemed to have waived his right to terminate for Good Reason with respect to such grounds.

5.2 Expiration of the Employment Term, Termination Without Cause or Termination for Good Reason . The Employment Term and the Executive's employment hereunder may be terminated by the Executive for Good Reason or by the Company without Cause. The Employment Term shall automatically terminate upon expiration of the Employment term. In the event of such termination or expiration, the Executive shall be entitled to receive the Accrued Amounts plus any base salary or benefits the Executive would have received during the 6 months from the Effective Date had there been no such termination or expiration. The intent is to give the same benefits and salary he would have received had he remained an employee until the Merger is completed or for 6 months from the Effective Date, whichever is later. For example, if this Agreement became effective December 1, 2016, and the Merger was completed December 31, 2016, then the Executive would be entitled to five more months of salary and benefits. If this Agreement became effective December 1, 2016, and the Merger was completed July 1, 2017, then the Executive would receive his base salary and benefits until July 1, 2017.

5.3 Death or Disability .  

(a) The Executive's employment hereunder shall terminate automatically upon the Executive's death during the Employment Term, and the Company may terminate the Executive's employment on account of the Executive's Disability.

(b) If the Executive's employment is terminated during the Employment Term on account of the Executive's death or Disability, the Executive (or the Executive's estate and/or beneficiaries, as the case may be) shall be entitled to receive the Accrued Amounts; and

Notwithstanding any other provision contained herein, all payments made in connection with the Executive's Disability shall be provided in a manner which is consistent with federal and state law.

(c) For purposes of this Agreement, " Disability " shall mean the Executive's inability, due to physical or mental incapacity, to perform the essential functions of his job, with reasonable accommodation, for one hundred eighty (180) days out of any three hundred sixty-five (365) day period. Any question as to the existence of the Executive's Disability as to which the Executive and the Company cannot agree shall be determined in writing by a qualified independent physician mutually acceptable to the Executive and the Company. If the Executive and the Company cannot agree as to a qualified independent physician, each shall appoint such a physician and those two physicians shall select a third who shall make such determination in writing. The determination of Disability made in writing to the Company and the Executive shall be final and conclusive for all purposes of this Agreement.

5.4 Notice of Termination . Any termination of the Executive's employment hereunder, other than expiration, by the Company or by the Executive during the Employment Term (other than on account of the Executive's death) shall be communicated by written notice of termination (" Notice of Termination ") to the other party hereto in accordance with this Agreement. The Notice of Termination shall specify:

(a) The termination provision of this Agreement relied upon;

(b) To the extent applicable, the facts and circumstances claimed to provide a basis for termination of the Executive's employment under the provision so indicated; and

(c) The applicable Termination Date.

5.5 Termination Date . The Executive's " Termination Date " shall be:

(a) If the Executive's employment hereunder terminates on account of the Executive's death, the date of the Executive's death;

(b) If the Executive's employment hereunder is terminated on account of the Executive's Disability, the date that it is determined that the Executive has a Disability;

(c) If the Company terminates the Executive's employment hereunder for Cause, the date the Notice of Termination is delivered to the Executive;

(d) If the Company terminates the Executive's employment hereunder without Cause, the date specified in the Notice of Termination, which shall be no less than 3 days following the date on which the Notice of Termination is delivered shall be the termination date.

(e) If the Executive terminates his employment hereunder with or without Good Reason, the date specified in the Executive's Notice of Termination, which shall be no less than 3 days following the date on which the Notice of Termination is delivered; and

(f) If the Employment Term expires before termination, then the termination Date shall be the date the Employment Term expires.

5.6 Resignation of All Other Positions . Upon termination of the Executive's employment hereunder for any reason, Executive shall be deemed to have resigned from all positions that the Executive holds as an officer or member of the Board (or a committee thereof) of the Company or any of its affiliates.

6. Cooperation . The parties agree that certain matters in which the Executive will be involved during the Employment Term may necessitate the Executive's cooperation in the future. Accordingly, following the termination of the Executive's employment for any reason, to the extent reasonably requested by the Supervisors, the Executive shall cooperate with the Company in connection with matters arising out of the Executive's service to the Company; provided that, the Company shall make reasonable efforts to minimize disruption of the Executive's other activities. The Company shall reimburse the Executive for reasonable expenses incurred in connection with such cooperation and, to the extent that the Executive is required to spend substantial time on such matters, the Company shall compensate the Executive at an hourly rate based on the Executive's Base Salary on the Termination Date.

7. Confidential Information . The Executive understands and acknowledges that prior to and during the Employment Term, he has and will have access to and learn about Confidential Information, as defined below. The “Company Group” is defined as the Company together with its officers, directors, subsidiaries, affiliates, partners, shareholders, and employees.

7.1 Confidential Information Defined .  

(a) Definition .

For purposes of this Agreement, " Confidential Information " includes, but is not limited to, all information not generally known to the public, in spoken, printed, electronic or any other form or medium, relating directly or indirectly to: business processes, practices, methods, policies, plans, publications, documents, research, operations, services, strategies, techniques, agreements, contracts, terms of agreements, transactions, potential transactions, negotiations, pending negotiations, know-how, trade secrets, computer programs, computer software, applications, operating systems, software design, web design, work-in-process, databases, manuals, records, articles, systems, material, sources of material, supplier information, vendor information, financial information, results, accounting information, accounting records, legal information, marketing information, advertising information, pricing information, credit information, design information, payroll information, staffing information, personnel information, employee lists, supplier lists, vendor lists, developments, reports, internal controls, security procedures, graphics, drawings, sketches, market studies, sales information, revenue, costs, formulae, notes, communications, algorithms, product plans, designs, styles, models, ideas, audiovisual programs, inventions, unpublished patent applications, original works of authorship, discoveries, experimental processes, experimental results, specifications, customer information, customer lists, client information, client lists, manufacturing information, factory lists, distributor lists, and buyer lists of the Company Group or its businesses or any existing or prospective customer, supplier, investor or other associated third party, or of any other person or entity that has entrusted information to the Company Group in confidence.

The Executive understands that the above list is not exhaustive, and that Confidential Information also includes other information that is marked or otherwise identified as confidential or proprietary, or that would otherwise appear to a reasonable person to be confidential or proprietary in the context and circumstances in which the information is known or used.

The Executive understands and agrees that Confidential Information includes information developed by him in the course of his employment by the Company as if the Company furnished the same Confidential Information to the Executive in the first instance. Confidential Information shall not include information that is generally available to and known by the public at the time of disclosure to the Executive; provided that, such disclosure is through no direct or indirect fault of the Executive or person(s) acting on the Executive's behalf.

(b) Company Creation and Use of Confidential Information .

The Executive understands and acknowledges that the Company Group has invested, and continues to invest, substantial time, money, and specialized knowledge into developing its resources, creating a customer base, generating customer and potential customer lists, training its employees, and improving its offerings in the field of cogeneration and emissions technology. The Executive understands and acknowledges that as a result of these efforts, the Company Group has created, and continues to use and create Confidential Information. This Confidential Information provides the Company Group with a competitive advantage over others in the marketplace.

(c) Disclosure and Use Restrictions .

The Executive agrees and covenants: (i) to treat all Confidential Information as strictly confidential; (ii) not to directly or indirectly disclose, publish, communicate, or make available Confidential Information, or allow it to be disclosed, published, communicated, or made available, in whole or part, to any entity or person whatsoever (including other employees of the Company Group) not having a need to know and authority to know and use the Confidential Information in connection with the business of the Company Group and, in any event, not to anyone outside of the direct employ of the Company Group except as required in the performance of the Executive's authorized employment duties to the Company or with the prior consent of authorized individual acting on behalf of the Company Group in each instance (and then, such disclosure shall be made only within the limits and to the extent of such duties or consent); and (iii) not to access or use any Confidential Information, and not to copy any documents, records, files, media, or other resources containing any Confidential Information, or remove any such documents, records, files, media, or other resources from the premises or control of the Company Group, except as required in the performance of the Executive's authorized employment duties to the Company or with the prior consent of authorized individual acting on behalf of the Company Group in each instance (and then, such disclosure shall be made only within the limits and to the extent of such duties or consent). Nothing herein shall be construed to prevent disclosure of Confidential Information as

may be required by applicable law or regulation, or pursuant to the valid order of a court of competent jurisdiction or an authorized government agency, provided that the disclosure does not exceed the extent of disclosure required by such law, regulation, or order. The Executive shall promptly provide written notice of any such order to President of the Company.

(d) Notice of Immunity Under the Economic Espionage Act of 1996, as amended by the Defend Trade Secrets Act of 2016 ("DTSA"). Notwithstanding any other provision of this Agreement:

(i) The Executive will not be held criminally or civilly liable under any federal or state trade secret law for any disclosure of a trade secret that:

(A) is made (1) in confidence to a federal, state, or local government official, either directly or indirectly, or to an attorney; and (2) solely for the purpose of reporting or investigating a suspected violation of law; or

(B) is made in a complaint or other document filed under seal in a lawsuit or other proceeding.

(ii) If the Executive files a lawsuit for retaliation by the Company for reporting a suspected violation of law, the Executive may disclose the Company's trade secrets to the Executive's attorney and use the trade secret information in the court proceeding if the Executive:

(A) files any document containing trade secrets under seal; and

(B) does not disclose trade secrets, except pursuant to court order.

8. Restrictive Covenants .

8.1      Acknowledgement . The Executive understands that the nature of the Executive's position gives him access to and knowledge of Confidential Information and places him in a position of trust and confidence with the Company Group. The Executive understands and acknowledges that the intellectual services he provides to the Company Group are unique, special, or extraordinary because he is an executive officer of the Company.

The Executive further understands and acknowledges that the Company Group's ability to reserve these for the exclusive knowledge and use of the Company Group is of great competitive importance and commercial value to the Company Group, and that improper use or disclosure by the Executive is likely to result in unfair or unlawful competitive activity.

8.2      Non-Competition . Because of the Company Group's legitimate business interest as described herein and the good and valuable consideration offered to the Executive, during the Employment Term and for the term of 12 months, to run consecutively, beginning on the last day of the Executive's employment with the Company, for any reason or no reason and whether employment is terminated at the option of the Executive or the Company Group, the Executive agrees and covenants not to engage in Prohibited Activity within any state that Tecogen is engaged in business, including but not limited to, Massachusetts, Connecticut, Rhode Island, New Hampshire, Vermont, Maine, New York, New Jersey, California, Pennsylvania, and Maryland.

For purposes of this Section 8, " Prohibited Activity " is activity in which the Executive contributes his knowledge, directly or indirectly, in whole or in part, as an employee, employer, owner, operator, manager, advisor, consultant, agent, employee, partner, director, stockholder, officer, volunteer, intern, or any other similar capacity to an entity engaged in the same or similar business as the Company Group, including those engaged in the business of cogeneration or emissions technology. Prohibited Activity also includes activity that may require or inevitably requires disclosure of trade secrets, proprietary information or Confidential Information.

The Company Group regards as its primary, but not exclusive, competitors as the following: Aegis Energy Services, Inc., and Capstone Inc.

Nothing herein shall prohibit the Executive from purchasing or owning less than five percent (5%) of the publicly traded securities of any corporation, provided that such ownership represents a passive investment and that the Executive is not a controlling person of, or a member of a group that controls, such corporation.

This Section 8 does not, in any way, restrict or impede the Executive from exercising protected rights to the extent that such rights cannot be waived by agreement or from complying with any applicable law or regulation or a valid order of a court of competent jurisdiction or an authorized government agency, provided that such compliance does not exceed that required by the law, regulation, or order. The Executive shall promptly provide written notice of any such order to the President of the Company.

8.3     Non-Solicitation of Employees . The Executive agrees and covenants not to directly or indirectly solicit, hire, recruit, attempt to hire or recruit, or induce the termination of employment of any employee of the Company Group during the 12 months to run consecutively, beginning on the last day of the Executive's employment with the Company.

8.4      Non-Solicitation of Customers . The Executive understands and acknowledges that because of the Executive's experience with and relationship to the Company Group, he will have access to and learn about much or all of the Company Group's customer information. " Customer Information " includes, but is not limited to, names, phone numbers, addresses, e-mail addresses, order history, order preferences, chain of command, pricing information, and other information identifying facts and circumstances specific to the customer and relevant to sales and services.

The Executive understands and acknowledges that loss of this customer relationship and/or goodwill will cause significant and irreparable harm.

The Executive agrees and covenants, during the two (2) years, to run consecutively, beginning on the last day of the Executive's employment with the Company, not to directly or indirectly solicit, contact (including but not limited to e-mail, regular mail, express mail, telephone, fax, and instant message), attempt to contact, or meet with the Company's current, former or prospective customers for purposes of offering or accepting goods or services similar to or competitive with those offered by the Company.

This restriction shall only apply to:

(a)    Customers or prospective customers the Executive contacted in any way during the past 24 months;

(b)    Customers about whom the Executive has trade secret or confidential information;

(c)     Customers who became customers during the Executive's employment with the Company; and

(d)     Customers about whom the Executive has information that is not available publicly.

9. Non-Disparagement . The Executive agrees and covenants that he will not at any time make, publish or communicate to any person or entity or in any public forum any defamatory or disparaging remarks, comments, or statements concerning the Company Group or its businesses, or any of its employees, officers, and existing and prospective customers, suppliers, investors and other associated third parties.

This Section 9 does not, in any way, restrict or impede the Executive from exercising protected rights to the extent that such rights cannot be waived by agreement or from complying with any applicable law or regulation or a valid order of a court of competent jurisdiction or an authorized government agency, provided that such compliance does not exceed that required by the law, regulation, or order. The Executive shall promptly provide written notice of any such order to the President of the Company.

The Company agrees and covenants that it shall cause its officers to refrain from making any defamatory or disparaging remarks, comments, or statements concerning the Executive to any third parties.

10. Acknowledgement . The Executive acknowledges and agrees that the services to be rendered by him to the Company are of a special and unique character; that the Executive will obtain knowledge and skill relevant to the Company's industry, methods of doing business and marketing strategies by virtue of the Executive's employment; and that the restrictive covenants and other terms and conditions of this Agreement are reasonable and reasonably necessary to protect the legitimate business interest of the Company Group.

The Executive further acknowledges that the amount of his/her compensation reflects, in part, his/her obligations and the Company's rights under this Agreement; that he has no expectation of any additional compensation, royalties or other payment of any kind not otherwise referenced herein in connection herewith; and that he will not be subject to undue hardship by reason of his full compliance with the terms and conditions of this Agreement or the Company's enforcement thereof.

11. Remedies . In the event of a breach or threatened breach by the Executive of this Agreement, the Executive hereby consents and agrees that the Company shall be entitled to seek, in addition to other available remedies, a temporary or permanent injunction or other equitable relief against such breach or threatened breach from any court of competent jurisdiction, without the necessity of showing any actual damages or that money damages would not afford an adequate remedy, and without the necessity of posting any bond or other security. The aforementioned equitable relief shall be in addition to, not in lieu of, legal remedies, monetary damages, or other available forms of relief.

12. Arbitration . Any dispute, controversy or claim arising out of or related to this Agreement or any breach of this Agreement shall be submitted to and decided by binding arbitration. Arbitration shall be administered exclusively by American Arbitration Association and shall be conducted consistent with the rules, regulations, and requirements thereof as well as any

requirements imposed by state law. Any arbitral award determination shall be final and binding upon the parties. Any such arbitration and its result shall be Confidential Information. All arbitration shall take place in Boston, Massachusetts.

13. Proprietary Rights .

13.1 Work Product . The Executive acknowledges and agrees that all right, title, and interest in and to all writings, works of authorship, technology, inventions, discoveries, processes, techniques, methods, ideas, concepts, research, proposals, materials, and all other work product of any nature whatsoever, that are created, prepared, produced, authored, edited, amended, conceived, or reduced to practice by the Executive individually or jointly with others during the period of his employment by the Company and relate in any way to the business or contemplated business, products, activities, research, or development of the Company or result from any work performed by the Executive for the Company (in each case, regardless of when or where prepared or whose equipment or other resources is used in preparing the same), all rights and claims related to the foregoing, and all printed, physical and electronic copies, and other tangible embodiments thereof (collectively, " Work Product "), as well as any and all rights in and to US and foreign (a) patents, patent disclosures and inventions (whether patentable or not), (b) trademarks, service marks, trade dress, trade names, logos, corporate names, and domain names, and other similar designations of source or origin, together with the goodwill symbolized by any of the foregoing, (c) copyrights and copyrightable works (including computer programs), mask works, and rights in data and databases, (d) trade secrets, know-how, and other confidential information, and (e) all other intellectual property rights, in each case whether registered or unregistered and including all registrations and applications for, and renewals and extensions of, such rights, all improvements thereto and all similar or equivalent rights or forms of protection in any part of the world (collectively, " Intellectual Property Rights "), shall be the sole and exclusive property of the Company.

For purposes of this Agreement, Work Product includes, but is not limited to, Company Group information, including plans, publications, research, strategies, techniques, agreements, documents, contracts, terms of agreements, negotiations, know-how, computer programs, computer applications, software design, web design, work in process, databases, manuals, results, developments, reports, graphics, drawings, sketches, market studies, formulae, notes, communications, algorithms, product plans, product designs, styles, models, audiovisual programs, inventions, unpublished patent applications, original works of authorship, discoveries, experimental processes, experimental results, specifications, customer information, client information, customer lists, client lists, manufacturing information, marketing information, advertising information, and sales information.

13.2 Work Made for Hire; Assignment . The Executive acknowledges that, by reason of being employed by the Company at the relevant times, to the extent permitted by law, all of the Work Product consisting of copyrightable subject matter is "work made for hire" as defined in 17 U.S.C. § 101 and such copyrights are therefore owned by the Company. To the extent that the foregoing does not apply, the Executive hereby irrevocably assigns to the Company, for no additional consideration, the Executive's entire right, title, and interest in and to all Work Product and Intellectual Property Rights therein, including the right to sue, counterclaim, and recover for all past, present, and future infringement, misappropriation, or dilution thereof, and all rights corresponding thereto throughout the world. Nothing contained in this Agreement shall be construed to reduce or limit the Company's rights, title, or interest in any Work Product or Intellectual Property Rights so as to be less in any respect than that the Company would have had in the absence of this Agreement.

13.3 Further Assurances; Power of Attorney . During and after his employment, the Executive agrees to reasonably cooperate with the Company to (a) apply for, obtain, perfect, and transfer to the Company the Work Product as well as any and all Intellectual Property Rights in the Work Product in any jurisdiction in the world; and (b) maintain, protect and enforce the same, including, without limitation, giving testimony and executing and delivering to the Company any and all applications, oaths, declarations, affidavits, waivers, assignments, and other documents and instruments as shall be requested by the Company. The Executive hereby irrevocably grants the Company power of attorney to execute and deliver any such documents on the Executive's behalf in his/her name and to do all other lawfully permitted acts to transfer the Work Product to the Company and further the transfer, prosecution, issuance, and maintenance of all Intellectual Property Rights therein, to the full extent permitted by law, if the Executive does not promptly cooperate with the Company's request (without limiting the rights the Company shall have in such circumstances by operation of law). The power of attorney is coupled with an interest and shall not be affected by the Executive's subsequent incapacity.

13.4 No License . The Executive understands that this Agreement does not, and shall not be construed to, grant the Executive any license or right of any nature with respect to any Work Product or Intellectual Property Rights or any Confidential Information, materials, software, or other tools made available to him by the Company.

14. Security .

    

14.1 Security and Access . The Executive agrees and covenants (a) to comply with all Company Group security policies and procedures as in force from time to time including without limitation those regarding computer equipment, telephone systems, voicemail systems, facilities access, monitoring, key cards, access codes, Company Group intranet, internet, social media and instant messaging systems, computer systems, e-mail systems, computer networks, document storage systems, software, data security, encryption, firewalls, passwords and any and all other Company Group facilities, IT resources and communication technologies (" Facilities and Information Technology Resources "); (b) not to access or use any Facilities and Information Technology Resources except as authorized by the Company; and (iii) not to access or use any Facilities and Information Technology Resources in any manner after the termination of the Executive's employment by the Company, whether termination is voluntary or involuntary. The Executive agrees to notify the Company promptly in the event he learns of any violation of the foregoing by others, or of any other misappropriation or unauthorized access, use, reproduction, or reverse engineering of, or tampering with any Facilities and Information Technology Resources or other Company Group property or materials by others.

14.2 Exit Obligations . Upon (a) voluntary or involuntary termination of the Executive's employment or (b) the Company's request at any time during the Executive's employment, the Executive shall (i) provide or return to the Company any and all Company Group property, including keys, key cards, access cards, identification cards, security devices, employer credit cards, network access devices, computers, cell phones, smartphones, PDAs, pagers, fax machines, equipment, speakers, webcams, manuals, reports, files, books, compilations, work product, e-mail messages, recordings, tapes, disks, thumb drives or other removable information storage devices, hard drives, negatives and data and all Company Group documents and materials belonging to the Company and stored in any fashion, including but not limited to those that constitute or contain any Confidential Information or Work Product, that are in the possession or control of the Executive, whether they were provided to the Executive by the Company Group or any of its business associates or created by the Executive in connection with his employment by the Company; and (ii) delete or destroy all copies of any such documents and materials not returned to the Company that remain in the Executive's possession or control, including those stored on any non-Company Group devices, networks, storage locations, and media in the Executive's possession or control.

15. Governing Law: Jurisdiction and Venue . This Agreement, for all purposes, shall be construed in accordance with the laws of Massachusetts without regard to conflicts of law principles. Any action or proceeding by either of the parties to enforce this Agreement shall be brought only in a state or federal court located in the state of Massachusetts, county of Suffolk. The parties hereby irrevocably submit to the exclusive jurisdiction of such courts and waive the defense of inconvenient forum to the maintenance of any such action or proceeding in such venue.

16. Entire Agreement . Unless specifically provided herein, this Agreement contains all of the understandings and representations between the Executive and the Company pertaining to the subject matter hereof and supersedes all prior and contemporaneous understandings, agreements, representations and warranties, both written and oral, with respect to such subject matter. The parties mutually agree that the Agreement can be specifically enforced in court and can be cited as evidence in legal proceedings alleging breach of the Agreement.

17. Modification and Waiver . No provision of this Agreement may be amended or modified unless such amendment or modification is agreed to in writing and signed by the Executive and by President of the Company. No waiver by either of the parties of any breach by the other party hereto of any condition or provision of this Agreement to be performed by the other party hereto shall be deemed a waiver of any similar or dissimilar provision or condition at the same or any prior or subsequent time, nor shall the failure of or delay by either of the parties in exercising any right, power, or privilege hereunder operate as a waiver thereof to preclude any other or further exercise thereof or the exercise of any other such right, power, or privilege.

18. Severability . Should any provision of this Agreement be held by a court of competent jurisdiction to be enforceable only if modified, or if any portion of this Agreement shall be held as unenforceable and thus stricken, such holding shall not affect the validity of the remainder of this Agreement, the balance of which shall continue to be binding upon the parties with any such modification to become a part hereof and treated as though originally set forth in this Agreement.

The parties further agree that any such court is expressly authorized to modify any such unenforceable provision of this Agreement in lieu of severing such unenforceable provision from this Agreement in its entirety, whether by rewriting the offending provision, deleting any or all of the offending provision, adding additional language to this Agreement, or by making such other modifications as it deems warranted to carry out the intent and agreement of the parties as embodied herein to the maximum extent permitted by law.

The parties expressly agree that this Agreement as so modified by the court shall be binding upon and enforceable against each of them. In any event, should one or more of the provisions of this Agreement be held to be invalid, illegal, or

unenforceable in any respect, such invalidity, illegality, or unenforceability shall not affect any other provisions hereof, and if such provision or provisions are not modified as provided above, this Agreement shall be construed as if such invalid, illegal, or unenforceable provisions had not been set forth herein.

19. Captions . Captions and headings of the sections and paragraphs of this Agreement are intended solely for convenience and no provision of this Agreement is to be construed by reference to the caption or heading of any section or paragraph.

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

21. Notification to Subsequent Employer . When the Executive's employment with the Company terminates, the Executive agrees to notify any subsequent employer of the restrictive covenants sections contained in this Agreement. The Executive will also deliver a copy of such notice to the Company before the Executive commences employment with any subsequent employer. In addition, the Executive authorizes the Company to provide a copy of the restrictive covenants sections of this Agreement to third parties, including but not limited to, the Executive's subsequent, anticipated, or possible future employer.

22. Successors and Assigns . This Agreement is personal to the Executive and shall not be assigned by the Executive. Any purported assignment by the Executive shall be null and void from the initial date of the purported assignment. The Company may assign this Agreement to any successor or assign (whether direct or indirect, by purchase, merger, consolidation, or otherwise) to all or substantially all of the business or assets of the Company. This Agreement shall inure to the benefit of the Company and permitted successors and assigns.

23. Notice . Notices and all other communications provided for in this Agreement shall be in writing and shall be delivered personally or sent by registered or certified mail, return receipt requested, or by overnight carrier to the parties at the addresses set forth below (or such other addresses as specified by the parties by like notice):

If to the Company:

Tecogen Inc.

45 First Ave, Waltham, MA 02451

President

If to the Executive:

_______________________________________________________

24. Representations of the Executive . The Executive represents and warrants to the Company that:

The Executive's acceptance of employment with the Company and the performance of his duties hereunder will not conflict with or result in a violation of, a breach of, or a default under any contract, agreement, or understanding to which he is a party or is otherwise bound.

The Executive's acceptance of employment with the Company and the performance of his duties hereunder will not violate any non-solicitation, non-competition, or other similar covenant or agreement of a prior employer.

25. Withholding . The Company shall have the right to withhold from any amount payable hereunder any Federal, state, and local taxes in order for the Company to satisfy any withholding tax obligation it may have under any applicable law or regulation.

26. Survival . Upon the expiration or other termination of this Agreement, the respective rights and obligations of the parties hereto shall survive such expiration or other termination to the extent necessary to carry out the intentions of the parties under this Agreement.

27. Acknowledgement of Full Understanding . THE EXECUTIVE ACKNOWLEDGES AND AGREES THAT HE HAS FULLY READ, UNDERSTANDS AND VOLUNTARILY ENTERS INTO THIS AGREEMENT. THE EXECUTIVE ACKNOWLEDGES AND AGREES THAT HE HAS HAD AN OPPORTUNITY TO ASK QUESTIONS AND CONSULT WITH AN ATTORNEY OF HIS CHOICE BEFORE SIGNING THIS AGREEMENT.

signature page follows

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first above written.