News Release

NYMEX to Change Margins for Financially Settled Electricity Futures Contracts

Tue Aug 01 2006

New York, N.Y., August 1, 2006 — The New York Mercantile Exchange, Inc. today announced today announced margin changes its financially settled electricity futures contracts on NYMEX ClearPort®, beginning at the close of business on Thursday.

Margins for the first month of the Dow Jones North Path 15 and the Dow Jones South Path 15 index electricity futures contracts will increase to $20,000 from $18,000 for clearing members, to $22,000 from $19,800 for members, and to $27,000 from $24,300 The margins for all other months remain the same.

The margins for the first month of the Cinergy Hub LMP peak electricity futures contract will increase to $10,000 from $8,500 for clearing members, to $11,000 from $9,350 for members, and to $13,500 from $11,475 for customers. Margins for all other months will remain the same.

The margins for the first month of the PJM Western hub LMP peak monthly electricity futures contract will increase to $16,000 from $15,000 for clearing members, to $17,600 from $16,500 for members, and to $21,600 from $20,250 for customers. Margins for all other months will remain the same.

Margins for the first month of the NYISO Zone A peak and NYISO Zone G peak electricity futures contracts will increase to $7,000 from $4,500 for clearing members, to $7,700 from $4,950for members, and to $9,450 from $6,075 for customers. The margins for all other months will remain the same.

Margins for the first month of the NYISO Zone J peak electricity futures contract will increase to $7,000 from $3,500 for clearing members, to $7,700 from $3,850 for members, and to $9,450 from $4,725 for customers. The margins for all other months will remain the same.

The margins for the first month of the ISO New England internal hub peak electricity futures contract will increase to $12,000 from $10,000 for clearing members, to $13,200 from $11,000 for members, and to $16,200 from $13,500 for customers. Margins for all other months will remain the same.

# # #


Forward Looking and Cautionary Statements
This press release may contain forward–looking statements within the meaning of the Private Securities Litigation Reform Act, with respect to our future performance, operating results, strategy, and other future events. Such statements generally include words such as could, can, anticipate, believe, expect, seek, pursue, and similar words and terms, in connection with any discussion of future results. Forward–looking statements involve a number of assumptions, risks, and uncertainties, any of which may cause actual results to differ materially from the anticipated, estimated, or projected results referenced in forward–looking statements. In particular, the forward–looking statements of NYMEX Holdings, Inc., and its subsidiaries are subject to the following risks and uncertainties: the success and timing of new futures contracts and products; changes in political, economic, or industry conditions; the unfavorable resolution of material legal proceedings; the impact and timing of technological changes and the adequacy of intellectual property protection; the impact of legislative and regulatory actions, including without limitation, actions by the Commodity Futures Trading Commission; and terrorist activities and international hostilities, which may affect the general economy as well as oil and other commodity markets. We assume no obligation to update or supplement our forward–looking statements.

Contact: Anu Ahluwalia , 212-299-2439

Corporate Communications

+1 312 930 3434
Email