UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 
SCHEDULE 13G/A
 
Under the Securities Exchange Act of 1934
(Amendment No. 6) *
 
American DG Energy Inc.
(Name of Issuer)
 
Common Stock, par value $.001 per share
(Title of Class of Securities)
 
025398108
(CUSIP Number)
 
December 13, 2016
(Date of Event which Requires Filing of this Statement)
 
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
 
 
  Rule 13d-1(b)
 
 
 
  Rule 13d-1(c)
 
 
X
  Rule 13d-1(d)
 
















___________________
* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.
 
The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).
 





CUSIP No. 025398108
1
 
NAME OF REPORTING PERSON
Dr. George N. Hatsopolous
2
 
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ( See  Instructions) (a) o
                                                                                                                                                   (b) o

3
 
SEC USE ONLY
 
 
4
 
CITIZENSHIP OR PLACE OF ORGANIZATION
 
United States of America
 
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH
 
5
 
SOLE VOTING POWER
 
5,824,619
6
 
SHARED VOTING POWER
 
824,177
7
 
SOLE DISPOSITIVE POWER
5,824,619

8
 
SHARED DISPOSITIVE POWER
 824,177
9
 
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
6,648,796

10
 
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ( See  Instructions) o
 
11
 
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
13.12%
12
 
TYPE OF REPORTING PERSON ( See  Instructions)
 
IN




CUSIP No. 0253498108
Item 1(a). Name of Issuer:
American DG Energy Inc.
Item 1(b). Address of Issuer’s Principal Executive Offices:
45 First Avenue, Waltham, MA 02451
Item 2(a). Name of Person Filing:
Dr. George N Hatsopoulos
Item 2(b). Address of Principal Business Office or, if None, Residence:
c/o American DG Energy Inc., 45 First Avenue, Waltham, MA 02451
Item 2(c). Citizenship:
United States of America
Item 2(d). Title of Class of Securities:
Common Stock, par value $.001 per share
Item 2(e). CUSIP Number:
025398108
Item 3. If the Statement is being filed pursuant to Rule 13d-1(b) or 13d-2(b) or (c), check whether the filing person is a:
(a)
o
Broker or dealer registered under Section 15 of the Exchange Act;
(b)
o
Bank as defined in Section 3(a) (6) of the Exchange Act;
(c)
o
Insurance company as defined in Section 3(a) (19) of the Exchange Act;
(d)
o
Investment company registered under Section 8 of the Investment Company Act;
(e)
o
An investment adviser in accordance with Rule 13d-1(b) (1) (ii) (E);
(f)
o
An employee benefit plan or endowment fund in accordance with Rule 13d-1(b) (1) (ii) (F);
(g)
o
A parent holding company or control person in accordance with Rule 13d-1(b) (1) (ii) (G);
(h)
o
A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;
(i)
o
A church plan that is excluded from the definition of an investment company under Section 3(c) (14) of the Investment Company Act;
(j)
o
Group, in accordance with Rule 13d-1(b) (1) (ii) (J).
Not applicable.
Item 4. Ownership.
(a)
Amount beneficially owned: 6,648,796 shares of American DG Energy Inc. common stock, par value $0.001 per share (“Common Stock”). Includes: 5,824,619 shares of Common Stock, directly held by Dr. George N. Hatsopoulos, and 824,177 shares of Common Stock held by Dr. George N. Hatsopoulos and his wife Daphne Hatsopoulos as joint tenants.
(b)
Percent of class: 13.20% (based on 50,684,095 shares of Common Stock outstanding as of November 14, 2016, according to the Company's most recent report on Form10-Q filed with the Securities and Exchange Commission November 14, 2016).
(c)
Number of shares as to which such person has:
(i)    Sole power to vote or direct the vote:            5,824,619
(ii)    Shared power to vote or direct the vote:            824,177
(iii)    Sole power to dispose or to direct the disposition of:        5,824,619
(iv)    Shared power to dispose or to direct the disposition of:    824,177
Item 5.    Ownership of Five Percent or Less of a Class.
If this statement is being filed to report the fact that as of the date hereof the reporting person had ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ].
Item 6.
Ownership of More than Five Percent on Behalf of Another Person.
Not applicable.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not applicable.




Item 8.    Identification and Classification of Members of the Group.
Not applicable.
Item 9.    Notice of Dissolution of Group.
Not applicable.
Item 10.    Certification.
Not applicable.





SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

s George N. Hatsopoulos
George N. Hatsopoulos

Date: December 14, 2016



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