Document:

Exhibit 10.13

                  AGREEMENT FOR THE ISSUANCE AND SALE OF STOCK

      This Agreement for the Issuance and Sale of Stock is made this 16th day of
June, 2003 between DESERT HEALTH PRODUCTS, INC., an Arizona corporation (the
"Company") and ParTrusT "Beheer" B.V., a Netherlands corporation ("ParTrusT").

                                     RECITAL

      ParTrusT desires to purchase 1,100,000 additional shares of the Company's
Preferred Stock (the "Shares") and the Company desires to issue and sell such
stock to ParTrusT pursuant to the provisions of this Agreement.

      NOW THEREFORE, in consideration of the mutual agreements, covenants and
provisions herein contained, the parties agree as follows:

      1. ISSUANCE AND SALE OF THE SHARES. In consideration of the tender of the
Purchase Price, the Company shall issue the Shares to ParTrusT.

      2. PURCHASE PRICE. The Purchase Price of the Shares shall be the full
amount of all indebtedness due and owing from the Company to ParTrusT under
those two certain Agreements between the Company and ParTrusT dated October 17,
2000 and December 8, 2000, copies of which are attached hereto for reference.
Upon issuance and delivery of the Shares, the foregoing agreements shall be
deemed fully paid and satisfied, and all obligations of either party to the
other thereunder shall be extinguished.

      3. REPURCHASE OPTIONS. For the period of 24 months from the date of this
Agreement, the Company shall have the option to repurchase the Shares from
ParTrusT, in one or more transactions. For a period of 180 days following the
period of 24 months from the date of this Agreement, ParTrusT shall have the
right to require the Company to purchase some or all of the remaining Shares
then owned by ParTrusT. The repurchase options, and the terms and conditions
under which they may be exercised, are as set forth in that Option Agreement of
even date herewith the ("Option Agreement").

           4. SHAREHOLDER RIGHTS. The Shares issued hereunder (but not any other
preferred of common shares of the Company which may be owned by ParTrusT now or
in the future) shall entitle ParTrusT to the following rights and privileges:

           (a) PAYMENT. From the date of this Agreement until the earlier of the

Exhibit 10.13 - 10QSB June 30, 2003

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date of repurchase under the Option Agreement or the second anniversary of the
date of this agreement, ParTrusT shall be entitled to receive the sum of
US$0.0375 per calendar quarter for each Share, with the accrual of such payment
commencing as of the third calendar quarter of 2003. Payment of such obligation
for each quarter due on or before the 15th day of the first month following such
quarter. The payment obligation for the third calendar and fourth quarters of
2003 may be paid by the issuance to ParTrusT of prefered stock at $1.00 per
share, convertible to free-trading common stock at 80% of the prior 31 day
average bid price for such stock, provided, however, that the Company shall use
best efforts to pay the fourth quarter obligation in cash.

      (b) NON-DILUTION. So long as ParTrusT owns any of the Shares, without the
written consent of ParTrusT, the Company shall not issue any equity security of
higher preference priority than the Shares, and shall not issue any equity
security of equal preference priority to the Shares for consideration less than
US$1.00 per share. As to any issuance of additional shares of the Company's
Preferred Stock, or any other equity security of equal preference priority to
the Shares, ParTrusT shall have preemptive rights to purchase such additional
Preferred Stock or other equity security on the most favorable terms and
conditions offered to any purchaser for such security.

      5. REPRESENTATIONS OF PARTRUST. ParTrusT hereby represents and warrants to
the Company that it is purchasing the Shares for investment purposes and not
with a view to their redistribution or resale, that it has the full power,
right, legal capacity, and authority to enter into and perform its obligations
under this Agreement, and no approval or consent of any third parties is
necessary in connection herewith. ParTrusT has had the opportunity to review the
merits of the purchase of the Shares contemplated hereby with tax and legal
counsel and financial advisors as deemed appropriate. ParTrusT understands that
the Shares acquired pursuant to this Agreement have not been registered under
the Securities Act of 1933, as amended (the "Act"), and have not been registered
under the blue sky laws of the State of Arizona or any other state. ParTrusT
understands that without such registration, the Shares may not be sold, pledged,
hypothecated or otherwise transferred, except pursuant to an exemption from
registration or such registration. The Shares are therefore, what is commonly
referred to as "restricted stock."

      6. ENTIRE AGREEMENT; MODIFICATION; WAIVER. This Agreement together with
the Option Agreement, constitutes the entire agreement between the parties
pertaining to the subject matter contained herein and supersedes all prior and
contemporaneous agreements, representations, and understandings of

Exhibit 10.13 - 10QSB June 30, 2003

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the parties. No supplement, modification, or amendment of this Agreement shall
be binding unless executed in writing by both of the parties. No waiver of any
of the provisions of this Agreement shall be deemed, or shall constitute, a
waiver of any other provision, whether or not similar, nor shall any waiver
constitute a continuing waiver. No waiver shall be binding unless executed in
writing by the party making the waiver.

      7. GOVERNING LAW. this Agreement shall be construed in accordance with and
governed by the laws of the State of Arizona.

      8. COUNTERPARTS. This Agreement may be executed in counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement the
day and year first above written.

DESERT HEALTH PRODUCTS, INC.                         PARTRUST "BEHEER" B.V.

By: S/S Johnny Shannon                               By: S/S Paul Spee
   ------------------------                             ------------------------
 Its: President                                       Its: President
     ----------------------                               ----------------------

Exhibit 10.13 - 10QSB June 30, 2003

                                                                               3AMENDMENT NO. 5 TO ESCROW AGREEMENT

            THIS AMENDMENT NO. 5 to the Escrow Agreement is made as of the 15th
day of April, 2003 (as supplemented or modified from time to time, this
"Agreement") by and among AJG Financial Services, Inc., through its
Vice-President, General Counsel as agent (the "Major Shareholder Agent") for
Bernard J. Zahren, Finova Mezzanine Capital Corp., AJG Financial Services, Inc.,
Environmental Opportunities Fund (by itself and as successor to Environmental
Opportunities Fund Cayman), Fredric Rose, M&R Associates, Martin F. Laughlin,
Richard C. Augustine and Michael J. Carolan (each, an "Initial Major
Shareholder") and for Stephen Rosenberg, U.S. Energy Systems, Inc., a Delaware
corporation ("USE"), and US Energy Biogas Corp. (formerly known as Zahren
Alternative Power Corporation), as the successor to USE Acquisition Corp. a
Delaware corporation (the "Sub" and together with USE, the "USE Parties"),
Cinergy Energy Solutions, Inc., a Delaware corporation ("CES" and together with
the USE Parties, the "Beneficiaries"), and Tannenbaum Helpern Syracuse &
Hirschtritt LLP having an office at 900 Third Ave., New York, New York, 10022
(the "Escrow Agent"). Unless indicated otherwise, capitalized terms shall have
the same meanings herein as they have in the Escrow Agreement (as defined
below).

                              W I T N E S S E T H:

            WHEREAS, the parties hereto and the Initial Major Shareholders have
previously entered into that certain Escrow Agreement dated as of November 28,
2000 (as amended by Amendment No. 1 dated as of May 11, 2001, Amendment No. 2
dated as of November 1, 2002, Amendment No. 3 dated as of February 10, 2003 and
Amendment No. 4 dated as of March 13, 2003, the "Escrow Agreement");

            WHEREAS, the parties hereto now wish to amend the Escrow Agreement;

            NOW, THEREFORE, in consideration of $10.00 and other consideration,
the receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

            1.    The last sentence of Section 3(d) of the Escrow Agreement is
                  hereby amended by deleting the existing sentence in its
                  entirety and inserting in its place the following sentence:

                  The "Release Date" shall be May 15, 2003.

            2.    Except as amended hereby, the Escrow Agreement is hereby
                  ratified and confirmed and, as so amended, remains in full
                  force and effect on the date hereof.

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            IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be Executed as of the date first written above.

                                        MAJOR SHAREHOLDER AGENT:
                                        AJG FINANCIAL SERVICES, INC.

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        CINERGY ENERGY SOLUTIONS, INC.:

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        U.S. ENERGY SYSTEMS, INC.:

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        US ENERGY BIOGAS CORP:

                                        By: ____________________________________
                                        Name:
                                        Title:

                                        ESCROW AGENT:

                                        TANNENBAUM HELPERN SYRACUSE &
                                        HIRSCHTRITT LLP

                                        By: ____________________________________
                                               A Member of the Firm

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