Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  HATSOPOULOS GEORGE N
 2. Date of Event Requiring Statement (Month/Day/Year)
10/01/2013		 3. Issuer Name and Ticker or Trading Symbol
TECOGEN INC. [TGEN]
(Last)
(First)
(Middle)
233 TOWER ROAD		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

LINCOLN, MA 01773		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 1,225,714
D
 
Common Stock 2,250,000
I
See footnote (1)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
6% Convertible Debentures Due 2013 09/24/2001 10/31/2013 Common Stock 75,806 $ 1.2 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
HATSOPOULOS GEORGE N
233 TOWER ROAD
LINCOLN, MA 01773		   X   X    
HATSOPOULOS FAMILY 2012 TRUST
233 TOWER ROAD
LINCOLN, MA 01773		     X    

Signatures

/s/ George N. Hatsopoulos 10/01/2013
**Signature of Reporting Person Date
/s/ L. Joseph Comeau, Trustee, The Hatsopoulos Family 2012 Trust 10/01/2013
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) By the Hatsopoulos Family 2012 Trust. George N. Hatsopoulos disclaims beneficial ownership of these securities, except to the extent of any pecuniary interest he may be deemed to have in such shares, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.

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