-------------------------
                                                              OMB APPROVAL
                                                       -------------------------
                              UNITED STATES            OMB Number:     3235-0145
                   SECURITIES AND EXCHANGE COMMISSION  Expires December 31, 2005
                         WASHINGTON, D.C. 20549        Estimated average burden
                                                       hours per response.... 11
                              SCHEDULE 13D             -------------------------

                UNDER THE SECURITIES EXCHANGE ACT OF 1934
                            (AMENDMENT NO. )*

                    Distributed Energy Systems Corp.
--------------------------------------------------------------------------------
                            (Name of Issuer)

                      Common Stock, $0.01 par value
--------------------------------------------------------------------------------
                     (Title of Class of Securities)

                                25475V104
      -------------------------------------------------------------
                             (CUSIP Number)

                           Robert W. Shaw, Jr.
                            Arete Corporation
                              P.O. Box 1299
                         Center Harbor, NH 03226
                             (603) 253-9797
--------------------------------------------------------------------------------
  (Name, Address and Telephone Number of Person Authorized to Receive
                      Notices and Communications)

                            December 10, 2003
      -------------------------------------------------------------
         (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of ss.ss.240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box. [ ]

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See ss.240.13d-7 for other
parties to whom copies are to be sent.

*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
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. 25475V104                                                Page  2 of 14

--------------------------------------------------------------------------------
  1   NAMES OF REPORTING PERSONS.
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

      Robert W. Shaw, Jr.
--------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

                                                                    (a) [ ]
                                                                    (b) [X]

--------------------------------------------------------------------------------
  3   SEC USE ONLY

--------------------------------------------------------------------------------
  4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

      PF
--------------------------------------------------------------------------------
  5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
      2(d) or 2(e)                                                      [ ]
--------------------------------------------------------------------------------
  6   CITIZENSHIP OR PLACE OF ORGANIZATION

      United States citizen
--------------------------------------------------------------------------------
                      7   SOLE VOTING POWER

                          5,880,803 (1)
  NUMBER OF        -------------------------------------------------------------
                      8   SHARED VOTING POWER
  SHARES
BENEFICIALLY              0 shares
                   -------------------------------------------------------------
  OWNED BY            9   SOLE DISPOSITIVE POWER
    EACH
                          5,880,803 (1)
 REPORTING         -------------------------------------------------------------
                     10   SHARED DISPOSITIVE POWER
  PERSON
   WITH                   0 shares
--------------------------------------------------------------------------------
 11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      5,880,803 shares (1)
--------------------------------------------------------------------------------
 12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE
      INSTRUCTIONS)                                                     [ ]

--------------------------------------------------------------------------------
 13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      16.1%
--------------------------------------------------------------------------------
 14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

      IN
--------------------------------------------------------------------------------
(1) Includes 52,000 shares issuable upon exercise of options within 60 days of
September 30, 2003 and 1,083,031 shares issuable upon exercise of warrants.




CUSIP No. 25475V104                                                Page  3 of 14

--------------------------------------------------------------------------------
  1   NAMES OF REPORTING PERSONS.
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

      Micro-Generation Technology Fund, LLC
--------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

                                                                    (a) [ ]
                                                                    (b) [X]

--------------------------------------------------------------------------------
  3   SEC USE ONLY

--------------------------------------------------------------------------------
  4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

      WC
--------------------------------------------------------------------------------
  5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
      2(d) or 2(e)                                                      [ ]

--------------------------------------------------------------------------------
  6   CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                      7   SOLE VOTING POWER

                          0 shares
  NUMBER OF        -------------------------------------------------------------
                      8   SHARED VOTING POWER
   SHARES
BENEFICIALLY              0 shares
                  --------------------------------------------------------------
  OWNED BY            9   SOLE DISPOSITIVE POWER
    EACH
                          0 shares
  REPORTING       --------------------------------------------------------------
                     10   SHARED DISPOSITIVE POWER
   PERSON
    WITH
                          0 shares
--------------------------------------------------------------------------------
 11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      0 shares
--------------------------------------------------------------------------------
 12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE
      INSTRUCTIONS)                                                     [ ]

--------------------------------------------------------------------------------
 13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      --
--------------------------------------------------------------------------------
 14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

      OO
--------------------------------------------------------------------------------




CUSIP No. 25475V104                                                Page  4 of 14

--------------------------------------------------------------------------------
  1   NAMES OF REPORTING PERSONS.
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

      Utech Climate Challenge Fund, L.P.
--------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

                                                                    (a) [ ]
                                                                    (b) [X]

--------------------------------------------------------------------------------
  3   SEC USE ONLY

--------------------------------------------------------------------------------
  4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

      WC
--------------------------------------------------------------------------------
  5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
      2(d) or 2(e)                                                      [ ]

--------------------------------------------------------------------------------
  6   CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                      7   SOLE VOTING POWER

                          0 shares
  NUMBER OF        -------------------------------------------------------------
                      8   SHARED VOTING POWER
   SHARES
BENEFICIALLY              0 shares
                   -------------------------------------------------------------
 OWNED BY             9   SOLE DISPOSITIVE POWER
   EACH
                          0 shares
 REPORTING         -------------------------------------------------------------
                     10   SHARED DISPOSITIVE POWER
  PERSON
   WITH                   0 shares
--------------------------------------------------------------------------------
 11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      0 shares
--------------------------------------------------------------------------------
 12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE
      INSTRUCTIONS)                                                     [ ]

--------------------------------------------------------------------------------
 13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      --
--------------------------------------------------------------------------------
 14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

      OO
--------------------------------------------------------------------------------



CUSIP No. 25475V104                                                Page  5 of 14

--------------------------------------------------------------------------------
  1   NAMES OF REPORTING PERSONS.
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

      Arete Venture Investors II Limited Partnership.
--------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

                                                                    (a) [ ]
                                                                    (b) [X]

--------------------------------------------------------------------------------
  3   SEC USE ONLY


--------------------------------------------------------------------------------
  4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

      WC
--------------------------------------------------------------------------------
  5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
      2(d) or 2(e)                                                      [ ]

--------------------------------------------------------------------------------
  6   CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                      7   SOLE VOTING POWER

                          0 shares
   NUMBER OF       -------------------------------------------------------------
                      8   SHARED VOTING POWER
   SHARES
BENEFICIALLY              0 shares
                   -------------------------------------------------------------
  OWNED BY            9   SOLE DISPOSITIVE POWER
    EACH
                          0 shares
  REPORTING        -------------------------------------------------------------
                     10   SHARED DISPOSITIVE POWER
   PERSON
    WITH                  0 shares
--------------------------------------------------------------------------------
 11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      0 shares
--------------------------------------------------------------------------------
 12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE
      INSTRUCTIONS)                                                     [ ]

--------------------------------------------------------------------------------
 13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      --
--------------------------------------------------------------------------------
 14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

      PN
--------------------------------------------------------------------------------




CUSIP No. 25475V104                                                Page  6 of 14

--------------------------------------------------------------------------------
  1   NAMES OF REPORTING PERSONS.
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

      Utech LLC
--------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

                                                                    (a) [ ]
                                                                    (b) [X]

--------------------------------------------------------------------------------
  3   SEC USE ONLY


--------------------------------------------------------------------------------
  4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

      WC
--------------------------------------------------------------------------------
  5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
      2(d) or 2(e)                                                  [ ]

--------------------------------------------------------------------------------
  6   CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                      7   SOLE VOTING POWER

                          0 shares
  NUMBER OF        -------------------------------------------------------------
                      8   SHARED VOTING POWER
   SHARES
BENEFICIALLY              0 shares
                   -------------------------------------------------------------
  OWNED BY            9   SOLE DISPOSITIVE POWER
    EACH
                          0 shares
 REPORTING         -------------------------------------------------------------
                     10   SHARED DISPOSITIVE POWER
  PERSON
   WITH                   0 shares
--------------------------------------------------------------------------------
 11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      0 shares
--------------------------------------------------------------------------------
 12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE
      INSTRUCTIONS)                                                 [ ]

--------------------------------------------------------------------------------
 13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      --
--------------------------------------------------------------------------------
 14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

      OO
--------------------------------------------------------------------------------




CUSIP No. 25475V104                                                Page  7 of 14

Item 1.    Security and Issuer.

         This statement relates to the common stock, $.01 par value (the "Common
Stock"), of Distributed Energy Systems Corp. (the "Issuer") having its principal
executive office at 10 Technology Drive, Wallingford, CT 06492.

Item 2.   Identity and Background.

         This statement is being filed by Dr. Robert W. Shaw, Jr. ("Dr. Shaw"),
Micro-Generation Technology Fund, LLC ("MG"), Utech Climate Challenge Fund L.P.
("Climate Challenge"), Utech LLC, ("Utech") and Arete Venture Investors II
Limited Partnership ("AVI") (each a "Reporting Person" and collectively the
"Reporting Persons").



Item 2(a)                                  Item 2(b)                                            Item 2(c)
---------                                  ---------                                            ---------

                                                                                          Citizenship or Place
Name of Person Filing                      Address                                           of Organization
---------------------                      -------                                           ---------------
                                                                                   
Robert W. Shaw, Jr.                        c/o Arete Corporation                          United States citizen
                                           P.O. Box 1299
                                           Center Harbor, NH 03226

MG                                         c/o Arete Corporation                                Delaware
                                           P.O. Box 1299
                                           Center Harbor, NH 03226

Climate Challenge                          c/o Arete Corporation                                Delaware
                                           P.O. Box 1299
                                           Center Harbor, NH 03226

Utech                                      c/o Arete Corporation                                Delaware
                                           P.O. Box 1299
                                           Center Harbor, NH 03226

AVI                                        c/o Arete Corporation                                Delaware
                                           P.O. Box 1299
                                           Center Harbor, NH 03226




         Dr. Shaw is (i) the President of Arete Corporation, which is the
manager of MG and Utech, (ii) the managing member of the general partner of
Climate Challenge, and (iii) the general partner of AVI. In such capacities, he
has sole dispositive power with respect to the shares of Common Stock held by
MG, Climate Challenge, Utech and AVI. Dr. Shaw, therefore, may be deemed the
beneficial owner of the shares of Common Stock directly owned by Climate
Challenge, Utech and AVI. Dr. Shaw disclaims this beneficial ownership. The
principal business of each of MG, Climate Challenge, Utech and AVI is to make
investments.

         During the five years prior to the date hereof, none of the Reporting
Persons has been convicted in a criminal proceeding or has been a party to a
civil proceeding ending in a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to, federal or
state securities laws or finding any violation with respect to such laws.




CUSIP No. 25475V104                                                Page  8 of 14

Item 3.    Source and Amount of Funds or Other Consideration.

         Dr. Shaw funded the purchase of his interests in the entities that own
Common Stock from his personal funds. Each of the other Reporting Persons funded
its purchases of Common Stock from its own working capital.

Item 4.   Purpose of Transaction.

         Each of the Reporting Persons acquired the Common Stock for investment
purposes. Depending on market conditions, their continuing evaluation of the
business and prospects of the Issuer and other factors, the Reporting Persons
may dispose of or acquire additional shares of Common Stock. Except as set forth
in this Schedule 13D, none of the Reporting Persons has any present plans which
relate to or would result in:

         (a) The acquisition by any person of additional securities of the
Issuer, or the disposition of securities of the Issuer;

         (b) An extraordinary corporate transaction, such as a merger,
reorganization or liquidation, involving the Issuer or any of its subsidiaries;

         (c) A sale or transfer of a material amount of assets of the Issuer or
any of its subsidiaries;

         (d) Any change in the present board of directors or management of the
Issuer, including any plans or proposals to change the number or term of
directors or to fill any existing vacancies on the board;

         (e) Any material change in the present capitalization or dividend
policy of the Issuer;

         (f) Any other material change in the Issuer's business or corporate
structure;

         (g) Changes in the Issuer's charter, bylaws or instruments
corresponding thereto or other actions which may impede the acquisition of
control of the Issuer by any person;

         (h) Causing a class of securities of the Issuer to be delisted from a
national securities exchange or to cease to be authorized to be quoted in an
inter-dealer quotation system of a registered national securities association;

         (i) A class of equity securities of the Issuer becoming eligible for
termination of registration pursuant to Section 12(g)(4) of the Securities
Exchange Act of 1934; or

         (j) Any action similar to any of those enumerated above.

Item 5.   Interest in Securities of the Issuer.

         On December 10, 2003, subsidiaries of the Issuer were merged into
Proton Energy Systems, Inc. ("Proton") and Northern Power Systems, Inc.
("Northern"). At the time of the merger,

         (i)   Dr. Shaw held of record 194,341 shares of common stock of Proton
               and options to purchase 52,000 shares of common stock that were
               exercisable within 60 days after September 30, 2003,




CUSIP No. 25475V104                                                Page  9 of 14

         (ii)  MG held of record 76,316 shares of common stock of Proton,

         (iii) Fund II held of record 1,891,763 shares of common stock of
               Proton, and

         (iv)  Climate Challenge held of record 1,534,620 shares of common stock
               of Proton, and

         (v)   UVCC II Parallel Fund, L.P., a venture fund affiliated with Dr.
               Shaw, held of record 285,715 shares of common stock of Proton.

         In addition,

         (i)   MG held of record 919,000 shares of preferred stock of Northern,

         (ii)  UVCC Fund II, a venture fund affiliated with Dr. Shaw, held of
               record 633,405 shares of preferred stock of Northern, and

         (iii) Climate Challenge held of record 558,925 shares of preferred
               stock of Northern.

         In the merger, each share of outstanding common stock of Proton was
converted into a share of Common Stock of the Issuer, and each share of
outstanding common stock of Northern was converted into an amount of cash, a
number of shares of Common Stock of the Issuer and warrants to purchase a number
of shares of Common Stock of the Issuer in accordance with the formulas set
forth in the merger agreement. The warrants have an exercise price of $2.80 per
share and expire on December 10, 2006. In the merger.

         (i)  MG received $4,005,108, 420,170 shares of Common Stock and
              warrants to purchase 471,412 shares of Common Stock in respect of
              its Northern preferred stock,

         (ii)  AVI and Utech, in their capacities as partners of Fund II,
               received $279,946 and $2,372,458, respectively, 65,626 shares of
               Common Stock and 262,504 shares of Common Stock, respectively,
               and warrants to purchase 64,982 shares of Common Stock and
               259,930 shares of Common Stock, respectively, in respect of Fund
               II's Northern preferred stock, and

         (iii) Climate Challenge received $2,374,086, 277,574 shares of Common
               Stock and warrants to purchase 286,707 shares of Common Stock in
               respect of its Northern preferred stock.

         Of the cash and Common Stock paid to Northern's stockholders in respect
of their Northern shares, 15% was placed in escrow to secure indemnification
obligations.

         On December 19, 2003, Parallel Fund distributed to its partners all
285,715 shares of Common Stock previously held by Parallel Fund. Of this amount,
21,144 shares were distributed to Dr. Shaw and 1,714 shares were distributed to
his wife. Also on December 19, 2003, Fund II distributed to its partners all
1,891,763 shares of Common Stock previously held by Fund II. Of this amount,
272,500 shares were distributed to AVI and 1,619,263 shares were distributed to
Utech.

         As a result of the above-described transactions,

         (i)   Dr. Shaw holds of record 215,485 shares of Common Stock and
               options to purchase 52,000 shares of common stock that were
               exercisable within 60 days after September 30, 2003 and his wife
               holds of record 1,714 shares of Common Stock,




CUSIP No. 25475V104                                                Page 10 of 14

         (ii)  MG holds of record 496,486 shares of Common Stock and a warrant
               to purchase 471,412 shares of Common Stock,

         (iii) Climate Challenge holds of record 1,812,194 shares of Common
               Stock and a warrant to purchase 286,707 shares of Common Stock,

         (iv)  AVI holds of record 338,126 shares of Common Stock, and a warrant
               to purchase 64,982 shares of Common Stock, and

         (v)   Utech holds of record 1,881,767 shares of Common Stock and a
               warrant to purchase 259,930 shares of Common Stock.

         Each of AVI and Utech anticipates that on or before March 31, 2004, it
will begin to distribute to its partners or members, as the case may be, shares
of Common Stock held by it which are not subject to lockup agreements or in
escrow.

         The shares of Common Stock beneficially owned by the Reporting Persons
represent an aggregate of 16.1% of the outstanding Common Stock of the Issuer.
Such percentage is calculated based upon 35,349,517 shares of Common Stock
outstanding as of December 10, 2003, as adjusted pursuant to Rule 13d-3(d) (1)
promulgated under the Act.

         Except as set forth above, none of the Reporting Persons has effected
any transaction in the Common Stock in the last 60 days. No other person is
known to have the right to receive or the power to direct the receipt of
dividends from, or any proceeds from the sale of, the Common Stock beneficially
owned by any of the Reporting Persons.

Item 6.   Contracts, Arrangements, Undertakings or Relationships with Respect to
          Securities of the Issuer.

         Each of MG, Climate Challenge, AVI and Utech have entered into a lockup
agreement under which they have agreed not to offer, sell or otherwise dispose
of the shares of Common Stock issued to them in the merger or upon exercise of
warrants issued in the merger for a period of three months after closing of the
merger with respect to 25% of such shares and six months after closing with
respect to the remainder of such shares.

Item 7.   Material to be Filed as Exhibits.

          Exhibit 1 - Form of Lockup Agreement.

          Exhibit 2 - Agreement regarding filing of joint Schedule 13D.




CUSIP No. 25475V104                                                Page 11 of 14


                                    SIGNATURE

         After reasonable inquiry and to the best of its knowledge and belief,
each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Date:    December 22, 2003

/s/ Robert W. Shaw, Jr.
-------------------------------------------
Robert W. Shaw, Jr.


MICRO-GENERATION TECHNOLOGY FUND, LLC

By:  ARETE CORPORATION, Manager

    By:  /s/ Robert W. Shaw, Jr.
         --------------------------------------------
         Robert W. Shaw, Jr., President

UTECH CLIMATE CHALLENGE FUND L.P.

By:  ARETE CLIMATE CHALLENGE PARTNERS, LLC

    By:  /s/ Robert W. Shaw, Jr.
         ---------------------------------------------------
         Robert W. Shaw, Jr., Managing Member

UTECH LLC

By:  ARETE CORPORATION, Manager

    By:  /s/ Robert W. Shaw, Jr.
         --------------------------------------------
         Robert W. Shaw, Jr., President

ARETE VENTURE INVESTORS II LIMITED PARTNERSHIP

    By:  /s/ Robert W. Shaw, Jr.
         --------------------------------------------
         Robert W. Shaw, Jr., General Partner