<DOCUMENT>
<TYPE>EX-10.30
<SEQUENCE>2
<FILENAME>v025803_ex10-30.txt
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                                                                   EXHIBIT 10.30


[GRAPHIC OMITTED][GRAPHIC OMITTED]

                                                      September 22, 2005

Mr. M. Grier Eliasek President and COO
Prospect Energy Corporation
10 East 40th Street, 44th Floor
New York, NY  10016

                                                      RE:  Letter Amendment #1

Dear Mr. Eliasek,

      Reference is made to that certain loan agreement  (the "Loan  Agreement"),
dated as of February 2, 2005, by and between Natural Gas Systems, Inc., a Nevada
corporation ("Borrower") and Prospect Energy Corporation, a Maryland corporation
("Lender").  Unless otherwise  specified  herein,  all defined terms in the Loan
Agreement shall have the same meanings specified therein.

      For  receipt  of  good  and  valuable   consideration,   which  is  hereby
acknowledged  and  received by Lender on the date  hereof,  Borrower  and Lender
agree  to  amend  Section  5.15  (b) of the  Loan  Agreement,  so that  the date
referenced  as "the quarter ended  September 30, 2005",  is deleted and replaced
with "the quarter  ended  December 31, 2005".  In addition,  Borrower and Lender
agree to add a new Section 6.17 as follows:

      "Section  6.17  Acquisitions.  Until the date that the Borrower  meets the
      EBITDA to Interest Expense test set forth in Section 5.15(b), the Borrower
      shall  not use more  than  $100,000  of cash and cash  equivalents  of the
      Borrower  as of  September  22,  2005,  including  but not  limited to the
      remaining proceeds of the May 2005 $3,000,000 equity offering,  to acquire
      any real property  interest,  including but not limited to the acquisition
      of leases of land or mineral rights.  This limitation does not include any
      costs incurred to evaluate any potential acquisition."

      Borrower and Lender agree that all other terms and  conditions of the Loan
Agreement,  the  Collateral and the  Collateral  Documents  shall remain in full
force and effect.

      This Letter  Amendment #1 is effective as of the date first written above,
as evidenced by the signatures of agreement below.

Sincerely,


Robert S. Herlin
President

Agreed and accepted this __________________

-----------------------------                        ---------------------------
Prospect Energy, Inc.                                Natural Gas Systems, Inc.
By:  M. Grier Eliasek                                By:
Its: President and COO                               Its:


 Natural Gas Systems, Inc. o Two Memorial City Plaza o 820 Gessner, Suite 1340
                             o Houston, Texas 77024

                      Tel: 713-935-0122     FAX: 713-935-0199
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