Document:

Exhibit 4.2

Form of Warrant

 

THIS WARRANT AND THE EUSP COMMON STOCK
ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED OR QUALIFIED FOR SALE UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY
STATE SECURITIES LAWS AND MAY NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR QUALIFICATION OR AN EXEMPTION THEREFROM
UNDER SAID ACT AND ANY STATE SECURITIES LAWS WHICH MAY BE APPLICABLE. ADGE MAY REQUIRE AN OPINION OF COUNSEL BEFORE IT EFFECTS
ANY TRANSFER ON ITS BOOKS AND RECORDS OF THIS WARRANT OR THE EUSP COMMON STOCK ISSUABLE UPON EXERCISE HEREOF.

 

 

WARRANT ISSUED BY AMERICAN DG ENERGY INC.

 

TO PURCHASE SHARES OF COMMON STOCK OF

 

EUROSITE POWER INC. OWNED BY IT

 

 

 

Key Terms/Definitions:

 

	ADGE:	American DG Energy Inc., a Delaware corporation
	EUSP:	EuroSite Power Inc., a Delaware corporation and a majority owned subsidiary of ADGE
	Holder:	 
	“EUSP Common Stock”:	Common Stock of EUSP owned by ADGE
	Number of shares of EUSP Common Stock issuable on full exercise of Warrant (subject to adjustment):	___________ shares
	Exercise Price per share of EUSP Common Stock (subject to adjustment):	$0.60
	Expiration Date:	Three (3) years from the effective date of this agreement

 

THIS IS TO CERTIFY
that, for value received and subject to the provisions hereinafter set forth, that the Holder, or permitted assigns, is entitled
to purchase from ADGE at any time on or after the date hereof and on or before the Expiration Date the number of shares of EUSP
Common Stock set forth in the table above, subject to the terms, provisions and conditions hereinafter set forth, at the Exercise
Price per share.

 

ADGE shall give the
Holder written notice of the pendency of the Expiration Date at least 10 days, but not more than 60 days, prior to the Expiration
Date. If ADGE fails to serve the Expiration Notice upon the Holder within the required time period, the Expiration Date shall be
deemed to have been extended and this Warrant shall continue to be exercisable by the Holder until 10 days after ADGE delivers
a delinquent Expiration Notice to the Holder referencing the new, extended Expiration Date.

 

    	 

    	 

    

 

Tender of the price
paid to purchase this Warrant shall be made by delivery of a bank check payable to ADGE or by wire transfer to ADGE’s designated
bank account, together with one executed copy of this Warrant.

 

SECTION 1.EXERCISE OF WARRANT.

 

This Warrant may be
exercised in whole or in part at any time by the surrender of this Warrant (with the subscription form at the end hereof duly completed
and executed) at the principal office of ADGE and upon payment to ADGE of the aggregate Exercise Price for the shares being purchased.
Notwithstanding any other provision hereof, if an exercise of any portion of this Warrant is to be made in connection with a sale
of EUSP, the exercise of any portion of this Warrant may, at the election of the Holder, be conditioned upon the consummation of
such sale, in which case such exercise shall not be deemed to be effective immediately prior to the consummation of such transaction.

 

If this Warrant is
exercised in respect of less than all of the shares of EUSP Common Stock at the time purchasable hereunder, the Holder shall be
entitled to receive a new Warrant of like tenor to this Warrant covering the number of shares in respect of which this Warrant
shall not have been exercised.

 

The EUSP Common Stock
issuable upon the exercise of this Warrant shall be deemed to have been issued to the Holder at the time of such exercise, and
the Holder shall be deemed for all purposes to have become the record holder of the EUSP Common Stock at such time. Certificates
for shares of the EUSP Common Stock purchased upon exercise or partial exercise of this Warrant shall be delivered by ADGE to Holder
within five business days after the date of exercise.

 

This Warrant and all
rights and options hereunder shall expire on the Expiration Date (as the same may be modified as provided herein), and shall be
wholly null and void to the extent this Warrant is not exercised before it expires.

 

SECTION 2.RESERVATION.

 

ADGE will at all times
prior to the Expiration Date keep available such number of the shares of the EUSP Common Stock owned by it solely for the purpose
of issuance upon the exercise of the rights represented by this Warrant as herein provided for, as may at any time be issuable
upon the exercise of this Warrant.

 

SECTION 3.STOCK DIVIDENDS, ETC.

 

The per share Exercise
Price and the number of shares deliverable hereunder shall be adjusted as hereinafter set forth:

 

Section 3.1. Stock
Dividends, Subdivisions and Combinations. In case after the date hereof EUSP shall:

 

(a)take
a record of the holders of EUSP Common Stock for the purpose of entitling them to receive a dividend payable in, or other distribution
of, EUSP Common Stock, or

 

(b)subdivide
its outstanding shares of EUSP Common Stock into a larger number of shares of EUSP Common Stock, or

 

(c)combine
its outstanding shares of EUSP Common Stock into a smaller number of shares of EUSP Common Stock,

 

    	 

    	 

    

 

then the per share Exercise Price shall
be adjusted, for the purpose of preserving the economic value of this Warrant, to the price determined by multiplying the per share
Exercise Price in effect immediately prior to such subdivision or combination or the taking of a record of holders in respect of
such payment or distribution, as the case may be (each, a “Triggering Event”) by a fraction (i) the numerator
of which shall be the total number of outstanding shares of EUSP Common Stock immediately prior to such Triggering Event, and (ii)
the denominator of which shall be the total number of outstanding shares of EUSP Common Stock immediately after such Triggering
Event.

 

Section 3.2.Adjustment
of Number of Shares Purchasable. Upon each adjustment of the per share Exercise Price, the number of shares of EUSP Common
Stock subsequently purchasable hereunder shall be an amount equal to the(i) the number of shares of EUSP Common Stock purchasable
hereunder immediately prior to such adjustment multiplied by (ii) a quotient derived by dividing the aggregate Exercise Price in
effect immediately before such adjustment by the per share Exercise Price in effect immediately following such adjustment or readjustment.

 

Section 3.3.Notice
of Adjustments. Whenever the per share Exercise Price or number of shares deliverable upon exercise of this Warrant shall be
adjusted pursuant to this Section 3, ADGE shall promptly prepare a certificate signed by the President or a Vice President and
by the Treasurer or an Assistant Treasurer of ADGE setting forth, in reasonable detail, the event requiring the adjustment, the
amount of the adjustment, the method by which such adjustment was calculated (including a description of the basis on which the
Board of Directors of ADGE made any determination hereunder), and shall promptly cause copies of such certificate to be mailed
(by first class mail, postage prepaid) to the Holder.

 

SECTION 4.MERGERS, CONSOLIDATIONS,
SALES.

 

In the case of any
consolidation or merger of EUSP with another entity (regardless of whether EUSP is the surviving entity), or the sale of all or
substantially all of its assets to another entity, or any reorganization or reclassification of the EUSP Common Stock or other
equity securities of EUSP, then, lawful and adequate provision shall be made by ADGE, to the extent possible, whereby the Holder
shall thereafter have the right to receive upon the basis and upon the terms and conditions specified herein and in lieu of the
shares of EUSP Common Stock immediately theretofore purchasable hereunder, such shares of stock, securities or assets (including,
without limitation, cash), if any, as may (by virtue of such consolidation, merger, sale, reorganization or reclassification) be
issued or payable with respect to or in exchange for a number of outstanding shares of EUSP Common Stock equal to the number of
shares of EUSP Common Stock immediately theretofore so purchasable hereunder had such consolidation, merger, sale, reorganization
or reclassification not taken place, and in any such case appropriate provisions shall be made with respect to the rights and interests
of the Holder to the end that the provisions hereof shall thereafter be applicable, as nearly as may be, in relation to any shares
of stock, securities or assets thereafter deliverable upon exercise of this Warrant. ADGE shall not consent to any such consolidation,
merger or sale of EUSP unless (a) ADGE or EUSP provides the holder hereof with not less than 10 days prior written notice of such
consolidate.0on, merger or sale (provided that the failure to give such notice shall not affect the validity of such corporate
event), and (b) prior to the consummation thereof, ADGE confirms its obligation to deliver to each such holder such shares of stock,
securities or assets as, in accordance with the foregoing provisions, such holder may be entitled to acquire.

 

SECTION 5.DISSOLUTION OR LIQUIDATION.

 

If EUSP declares or
pays a dividend upon the EUSP Common Stock payable otherwise than in cash out of earnings or earned surplus (determined in accordance
with generally accepted accounting principles, consistently applied) except for a stock dividend payable in shares of EUSP Common
Stock (a “Liquidating Dividend”), then ADGE shall pay to the Holder at the time of payment thereof the Liquidating
Dividend which would have been paid to such holder on the EUSP Common Stock had this Warrant been fully exercised immediately prior
to the date on which a record is taken for such Liquidating Dividend, or, if no record is taken, the date as of which the record
holders of EUSP Common Stock entitled to such dividends are to be determined.

 

    	 

    	 

    

 

SECTION 6.NOTICE OF DIVIDENDS; PAYMENTS.

 

If the Board of Directors
of EUSP shall declare any dividend or other distribution on any class of its EUSP Common Stock except by way of a stock dividend
payable in EUSP Common Stock on its EUSP Common Stock, ADGE shall mail notice thereof to the Holder not less than 10 days prior
to the record date fixed for determining shareholders entitled to participate in such dividend or other distribution, and the Holder
shall be entitled to receive, on the exercise of this Warrant, cash or other property from ADGE in an amount and of the same type
(cash or property) equal to that which the holder would have been entitled to receive if the unexercised portion hereof had been
exercised as of the record date of such dividend or distribution.

 

SECTION 7.NO FRACTIONAL SHARES.

 

No fractional shares
shall be issued upon the exercise of this Warrant under any circumstances.

 

SECTION 8.RESTRICTIONS ON TRANSFERABILITY OF WARRANTS
AND SHARES; COMPLIANCE WITH LAWS.

 

Notwithstanding anything
contained in this Warrant to the contrary, the terms and provisions of this Section 8 of this Warrant remain in full force and
effect at all times and shall survive the Expiration Date.

 

Section 8.1.In
General. This Warrant and the shares of EUSP Common Stock issued upon the exercise hereof shall not be transferable except
upon the conditions hereinafter referred to, which conditions are intended to ensure compliance with the provisions of the Securities
Act of 1933, as amended (or any similar federal statute at the time in effect) (the “Securities Act”), and any
applicable state securities laws in respect of the transfer of this Warrant or any such shares. Any attempt to transfer such Warrant
or such shares except in accordance with the terms hereof shall, to the extent legally enforceable, be void.

 

Section 8.2.Restrictive
Legends. Each Warrant and each certificate for shares of EUSP Common Stock issued upon the exercise of any Warrant shall bear
a customary restrictive legend relating to securities laws compliance until counsel for ADGE determines that such legend is no
longer legally required. This Warrant and any shares of EUSP Common Stock issuable upon exercise hereof may be transferred only
in accordance with the provisions of such legend, including the legend set forth on the first page hereof.

 

Section 8.3.Accredited
Investor. The initial Holder of this Warrant represents that it is an “accredited investor” as defined in the rules
and regulations under the Securities Act.

 

SECTION 9.EXERCISE IN FULL AND ASSIGNMENT
ONLY IN FULL.

 

This Warrant may only
be exercised or assigned for the number of shares of EUSP Common Stock subject hereto. If this Warrant is assigned in full, this
Warrant shall be surrendered at the principal office of ADGE (with the assignment form at the end hereof duly executed), and thereupon
a new Warrant of like tenor to this Warrant shall be issued to the assignee covering the number of shares of EUSP Common Stock
then issuable upon exercise of this Warrant.

 

    	 

    	 

    

 

SECTION 10.LOST, STOLEN WARRANTS, ETC.

 

In case this Warrant
shall be mutilated, lost, stolen or destroyed, ADGE may issue a new Warrant of like date, tenor and denomination and deliver the
same in exchange and substitution for and upon surrender and cancellation of the mutilated Warrant, or in lieu of the Warrant lost,
stolen or destroyed, upon receipt of evidence satisfactory to ADGE of the loss, theft or destruction of such Warrant, and upon
receipt of indemnity satisfactory to ADGE. All warrants hereafter issued in exchange or substitution for this Warrant shall be
substantially in the form hereof.

 

SECTION 11.WARRANT HOLDER RIGHTS.

 

This Warrant does not
confer upon the holder hereof any right to vote or to consent or to receive notice as a shareholder of EUSP, as such, in respect
of any matters whatsoever, or any other rights or liabilities as a shareholder, prior to the exercise hereof as hereinbefore provided.

 

SECTION 12.GOVERNING LAW.

 

This Warrant shall
be governed by the laws of the State of Delaware.

 

(Signature page immediately follows.)

 

    	 

    	 

    

 

IN WITNESS WHEREOF,
ADGE has caused this Warrant to be signed by a duly authorized officer.

 

Dated: October 3, 2014

 

	 	AMERICAN DG ENERGY INC.
	 	 	 
	 	By: 	 
	 	 	John H. Hatsopoulos, Chief Executive Officer

 

The initial Warrant Holder hereby confirms

the representations and covenants contained

in Section 8:

 

___________________________________

 

    	 

    	 

    

 

SUBSCRIPTION FORM

 

The undersigned,____________________________,
pursuant to the provisions of the within Warrant, hereby elects to exercise said Warrant to purchase from American DG Energy Inc.
the full number of shares of EUSP Common Stock covered by the within Warrant.

 

 

	 	 
	 	Signature
	 	Address:

 

 

Dated: _____________________________

 

    	 

    	 

    

 

FULL ASSIGNMENT

 

FOR VALUE RECEIVED,
____________________________ hereby sells, assigns and transfers unto_________________________ with an address of ____________________the
within Warrant and all rights evidenced thereby and does irrevocably constitute and appoint ___________________________, attorney,
to transfer the said Warrant on the books of American DG Energy Inc.

 

 

 

		 
	 	Assignor

 

 

Dated: ______________________________Exhibit 10.1

 

IN MAKING AN INVESTMENT DECISION, INVESTORS
MUST RELY ON THEIR OWN EXAMINATION OF THE ISSUERS OF THE SECURITIES THAT ARE REFERRED TO HEREIN, INCLUDING THE MERITS AND RISKS
INVOLVED. THE SECURITIES OFFERED HEREBY HAVE NOT BEEN RECOMMENDED BY ANY FEDERAL OR STATE SECURITIES COMMISSION OR REGULATORY AUTHORITY.
FURTHERMORE, THE FOREGOING AUTHORITIES HAVE NOT CONFIRMED THE ACCURACY OR DETERMINED THE ADEQUACY OF ANY OFFERING MATERIALS OR
THIS DOCUMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

 

THE SECURITIES REFERRED TO HEREIN ARE SUBJECT
TO RESTRICTIONS ON TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER THE U.S. SECURITIES
ACT OF 1933, AS AMENDED, AND APPLICABLE STATE SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM. INVESTORS SHOULD
BE AWARE THAT THEY MAY BE REQUIRED TO BEAR THE FINANCIAL RISKS OF THIS INVESTMENT FOR AN INDEFINITE PERIOD OF TIME.

 

American
dg energy inc.

 

EUROSITE
POWER INC.

 

Convertible Note Amendment Agreement

 

October 3, 2014

 

American DG Energy Inc.

EuroSite Power Inc.

45 First Avenue

Waltham, MA 02451

 

Ladies and Gentlemen:

 

1.Background.
The undersigned investor (the “Investor”) is the owner of convertible notes of American DG Energy Inc. (“ADGE”)
in the aggregate principal amount set forth on the signature page. Investors executing an agreement similar to this one are referred
to as the “Investors.” The aforesaid convertible notes of ADGE are referred to herein as the “ADGE
Notes.” Interest accrued and unpaid on the ADGE Notes, together with the balance of interest payable through the next
interest payment date of the ADGE Notes (“Current Interest”), is set forth on the signature page. Interest payable
on the ADGE Notes from and after the next interest payment date thereon through the maturity date thereof (“Future Interest”)
is set forth on the signature page. ADGE is the owner of shares of the common stock of EuroSite Power Inc. (“EUSP”
and such shares, the “EUSP Shares”). 

 

ADGE has agreed to
convert the Current Interest and the Future Interest on the ADGE Notes owned by the Investors into EUSP Shares owned by ADGE at
a conversion price of $0.50 per EUSP Share.

 

ADGE has agreed to
issue to the Investors warrants to purchase EUSP Shares owned by ADGE in connection with the conversion of Current Interest, with
the number of EUSP Shares subject to such warrants being set forth on the signature page at an exercise price of $0.60 per EUSP
Share

 

Further, the Investors
have agreed to convert the entire amount due in respect of the principal and interest on the convertible notes of EUSP (“EUSP
Notes”) owned by them into newly issued EUSP Shares, with the aggregate amount of principal and interest being converted
at a conversion price of $0.50 per EUSP Share, as set forth on the signature page. The portion of such aggregate amount being converted
that is interest consists of interest accrued through the date hereof (“Accrued Interest”) and the balance of
interest payable thereafter on the next interest payment date of the EUSP Notes (“Future Interest”).

 

    	 

    	 

    

 

2.Conversion
of Current and Future Interest on the ADGE Notes and Issuance of ADGE Warrants. 

 

a.Conversion
of ADGE Notes. Each Investor hereby converts the Current Interest and the Future Interest on the ADGE Notes owned by it into
EUSP Shares owned by ADGE at a conversion price of $0.50 per EUSP Share. 

 

b.Issuance
of ADGE Warrants to Purchase EUSP Shares owned by ADGE. ADGE agrees to issue warrants to purchase EUSP Shares owned by each
Investor, such warrants to be in the form of Exhibit A hereto and the number of EUSP Shares subject to such warrants being
set forth on the signature page.

 

c.Deliveries.
As soon as practical after the execution of this agreement by all parties, the Investor agrees to deliver to ADGE the ADGE Notes
owned by it, and in replacement thereof ADGE will issue a new convertible note for the same principal amount as the Investor’s
ADGE Notes in substantially the same form but reflecting the interest conversion. Further, upon delivery of the ADGE Notes held
by the Investor, ADGE agrees to transfer to the Investor the EUSP Shares being issued on conversion of the interest on the ADGE
Notes and the aforesaid warrants.

 

3.Conversion
of EUSP Notes. 

 

a.Conversion.
Each Investor hereby converts the entire principal, Accrued Interest and Future Interest on the EUSP Notes owned by it into newly
issued EUSP Shares at a purchase price per share of $0.50. 

 

b.Deliveries.
As soon as practical after the execution of this agreement by all parties, each Investor agrees to deliver to EUSP for cancellation
all of the EUSP Notes owned by it. Upon delivery of the EUSP Notes held by the Investor, EUSP agrees to issue to the Investor the
EUSP Shares to be issued on the conversion of the EUSP Notes. 

 

4.Representations
and Warranties. 

 

a.ADGE
and EUSP. ADGE and EUSP hereby confirm that their respective representations, warranties and agreements in the subscription
agreement and other documents pursuant to which the original ADGE Notes and the EUSP Notes were issued continue to be true and
correct as if made on the date hereof and as if made with respect to the securities being issued pursuant hereto, except that with
respect to such representations and warranties that speak as of a particular date, no material adverse change has occurred making
such representations and warranties untrue or incorrect in any material respect as of the date hereof.

 

b.The
Investor. The Investor hereby confirms that its representations, warranties and agreements in the subscription agreement and
other documents pursuant to which the Investor purchased its ADGE Notes and EUSP Notes are true and correct as of the date hereof.
Without limiting the foregoing, the Investor represents and warrants that he/it is an accredited investor, as such term is defined
in the regulations under the Securities Act of 1933, as amended.

 

5.Expenses.
Each party hereto shall each bear its own expenses incurred in connection with this transaction. 

 

6.Miscellaneous.

 

a.Notices.
When any notice is required or authorized hereunder, such notice shall be given in writing and shall be deemed effectively given:
(i) upon personal delivery to the party to be notified, (ii) when sent by confirmed electronic mail if sent during normal business
hours of the recipient, and if not sent during normal business hours, then on the next business day so long as receipt is confirmed,
(iii) five days after having been sent by registered or certified mail (or regular mail if registered or certified mail is unavailable
in the country of the recipient), (iv) if sent within the U.S., one business day after deposit with a recognized overnight courier,
specifying next business day delivery, with written verification of receipt or (v) if sent from the U.S. to an address outside
the U.S. or if sent from outside the U.S. to an address within the U.S., five business days after deposit with an internationally
recognized courier service specifying that delivery be made within five business days with written verification of receipt. All
notices and other communications shall be sent if sent to the Investor, to the business address or email address of the Investor
set forth on the signature page to this Agreement, as it may subsequently change by notice from the Investor; and

 

    	2

    	 

    

 

 

	 	If to ADGE, to:	American DG Energy Inc.
	 	 	45 First Avenue
	 	 	Waltham, MA 02451
	 	 	Attention:  Chief Financial Officer
	 	 	Email:   gabriel.parmese@americandg.com 
	 	 	 
	 	If to EuroSite, to:	EuroSite Power Inc.
	 	 	45 First Avenue
	 	 	Waltham, MA 02451
	 	 	Attention:  Chief Financial Officer
	 	 	Email:  gabriel.parmese@americandg.com
	 	 	 
	 	With a copy to:	Sullivan & Worcester LLP
	 	 	One Post Office Square
	 	 	Boston, MA 02109
	 	 	Attention:  Edwin L. Miller, Jr.
	 	 	Email:  emiller@sandw.com

 

Such notices or communications
shall be effective when received. If a notice or communication to Investor is sent in the manner provided above, it is duly given,
whether or not the addressee receives it. EuroSite by notice to the Investor may designate additional or different addresses for
subsequent notices or communications.

 

b.Successors
and Assigns. This Agreement shall be binding upon the heirs, executors, administrators, successors and assignees of the Investor.

 

c.Choice
of Law. This Agreement shall be governed by, and construed in accordance with, the internal laws of the State of New York and,
to the extent it involves any United States federal statute or regulations, in accordance therewith.

 

d.Consent
to Jurisdiction. The parties hereby consent and submit to the exclusive jurisdiction of the state and federal courts in New
York City with respect to all disputes arising in connection with this transaction.

 

e.Survival
of Representations. The parties agree that all of the warranties, representations, acknowledgments, confirmations, covenants
and promises made in this Agreement shall survive its execution and delivery.

 

f.Counterparts.
This Agreement may be executed in any number of counterparts each of which shall be deemed an original and which, taken together,
shall form one and the same agreement. Execution and delivery of this Agreement may be evidenced by a scan/.pdf of the executed
document sent by email.

 

g.Integration.
This Agreement is the complete and exclusive agreement between the parties with regard to the subject matter hereof and supersedes
any and all prior discussions, negotiations and memoranda related hereto.

 

h.Exercise of
Warrant. ADGE and EUSP agree to take any actions necessary to permit the exercise of the Warrant
upon satisfaction of the conditions of exercise set forth therein.

 

_________________

 

(Signature page immediately follows.)

 

 

    	3

    	 

    

 

The undersigned Investor, ADGE and EUSP
hereby execute this Convertible Note Amendment Agreement as of the date first set forth above.

 

	$510,000 interest due, 1,020,000 common shares and 

1,020,000 3-year warrants exercisable at $0.60.	 	 
	é Amount of Current Interest due, common
    shares to be exchanged and warrants to be issued, respectively, to A European Investor. ADGE Notes being converted into EUSP Shares
    owned by     ADGE at $0.50 per share and warrants to purchase EUSP shares, exercisable at $0.60 per share	 	
        /s/ A European Investor

        é A European Investor

	 	 	 
	$72,000 interest due, 144,000 common shares and 

144,000 3-year warrants exercisable at $0.60.	 	 
	é Amount of Current Interest due, common shares to be exchanged and warrants to be issued, respectively, to John Hatsopoulos. ADGE Notes being converted into EUSP Shares owned by ADGE at $0.50 per share and warrants to purchase EUSP shares, exercisable at $0.60 per share	 	
        /s/_John Hatsopoulos

        é John Hatsopoulos

	 	 	 
	$3,612,500 future interest due, 7,225,000 common shares	 	 
	é Amount of Future Interest due to A European Investor on ADGE Notes being converted into EUSP Shares owned by ADGE at $0.50 per share and number of common shares of EUSP to be exchanged for this future interest	 	
        /s/ A European Investor

        é A European Investor

	 	 	 
	$510,000 future interest due, 1,020,000 common shares	 	 
	é Amount of Future Interest due to John Hatsopoulos on ADGE Notes being converted into EUSP Shares owned by ADGE at $0.50 per share and number of common shares of EUSP to be exchanged for this future interest	 	
        /s/ John Hatsopoulos

        é John Hatsopoulos

	 	 	 
	$1,100,000 Convertible Note, 2,200,000 common shares	 	 
	é Value of EUSP convertible note owned by ADGE to be converted to common shares at a price of $0.50 and number of EUSP common shares to be issued by EUSP to ADGE for the conversion of convertible notes held by ADGE.	 	
        /s/ John Hatsopoulos

        é John Hatsopoulos

        CEO American DG Energy

	 	 	 
	$300,000 Convertible Note, 600,000 common shares	 	 
	é Value of EUSP convertible note owned by John Hatsopoulos to be converted to common shares at a price of $0.50 and number of EUSP common shares to be issued by EUSP to John Hatsopoulos for the conversion of convertible notes held by John Hatsopoulos.	 	
        /s/ John Hatsopoulos

        é John Hatsopoulos

	 	 	 
	$300,000 Convertible Note, 600,000 common shares	 	 
	é Value of EUSP convertible note owned by A European Investor to be converted to common shares at a price of $0.50 and number of EUSP common shares to be issued by EUSP to A European Investor for the conversion of convertible notes held by A European Investor.	 	
        /s/ A European Investor

        é A European Investor

	 	 	 
	 	 	 
	AGREED:	 	AGREED:
	 	 	 
	
        AMERICAN DG ENERGY INC.

         

        By: /s/ John Hatsopoulos
	 	
        EUROSITE POWER INC.

         

        By: /s/ Gabriel J. Parmese

  

    	4

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