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 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 *
  BROWN BONNIE JEAN
 2. Date of Event Requiring Statement (Month/Day/Year)
05/23/2017		 3. Issuer Name and Ticker or Trading Symbol
TECOGEN INC. [TGEN]
(Last)
(First)
(Middle)
C/O TECOGEN INC., 45 FIRST AVENUE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chief Accounting Officer
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

WALTHAM, MA 02451		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ 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 1,762
D
 

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
Stock Option (Right to Buy)   (1) 09/02/2025 Common Stock 9,200 $ 3.15 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
BROWN BONNIE JEAN
C/O TECOGEN INC.
45 FIRST AVENUE
WALTHAM, MA 02451		       Chief Accounting Officer  

Signatures

/s/ Bonnie Brown 06/01/2017
**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) Following the completion of the Merger and pursuant to the Merger Agreement between American DG Energy and the Company dated November 1, 2016 and as amended March 23, 2017, American DG Energy's securities were converted to securities of the Company.
 
Remarks:
This transaction is exempt from liability under Section 16(b) of the Securities Exchange Act of 1934.

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