News Release

NYMEX to Change Margins for Financially Settled Electricity Futres Contracts

Wed Jul 26 2006

New York, N.Y., July 26, 2006 — The New York Mercantile Exchange, Inc. today announced today announced margin changes for its Dow Jones North Path 15 index, Dow Jones Mid–Columbia index, Dow Jones Palo Verde index, and Dow Jones South Path 15 index electricity futures contracts on NYMEX ClearPort®, beginning at the close of business tomorrow.

Margins for the first through sixth months of the Dow Jones North Path 15 index electricity futures contract will increase to $12,000 from $8,000 for clearing members, to $13,200 from $8,800 for members, and to $16,200 from $10,800 for customers. The margins for all other will increase to $10,500 from $7,000 for clearing members, to $11,550 from $7,700 for members, and to $14,175 from $9,450 for customers.

The margins for the first month of the Dow Jones Mid–Columbia index electricity futures contract will increase to $10,500 from $7,000 for clearing members, to $11,550 from $7,700 for members, and to $14,175 from $9,450 for customers. Margins for the second to sixth months will increase to $12,000 from $7,000 for clearing members, to $13,200 from $7,700 for members, and to $16,200 from $9,450 for customers. Margins for the seventh to 11th months will increase to $10,500 from $7,000 for clearing members, to $11,550 from $7,700 for members, and to $14,175 from $9,450 for customers. The margins for all other months will increase to $5,250 from $3,500 for clearing members, to $5,775 from $3,850 for members, and to $7,088 from $4,725 for customers.

The margins for the second to sixth months of the Dow Jones Palo Verde index and Dow Jones South Path 15 index electricity futures contract will increase to $12,000 from $8,000 for clearing members, to $13,200 from $8,800 for members, and to $16,200 from $10,800 for customers. Margins for all other months will increase to $10,500 from $7,000 for clearing members, to $11,550 from $7,700 for members, and to $14,175 from $9,450 for customers.

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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

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