News Release

NYMEX to Change Margins for Financially Settled Electricity Futures Contracts

Thu Sep 14 2006

New York, N.Y., September 14, 2006 — The New York Mercantile Exchange, Inc. today announced margin changes for some of its financially settled electricity futures contracts on NYMEX ClearPort®, beginning at the close of business tomorrow.

Margins for the first to 11th months of the Cinergy Hub LMP peak electricity futures contract will remain the same. The margins for all other months will increase to $1,500 from $1,000 for clearing members, to $1,650 from $1,100 for members, and to $2,025 from $1,350 for customers.

Margins for the first to sixth months of the Northern Illinois Hub peak electricity futures contract will remain the same. The margins for seventh to 11th months will increase to $3,500 from $3,000 for clearing members, to $3,850 from $3,300 for members, and to $4,725 from $4,050 for customers. Margins for all other months will remain unchanged.

The margins for the first to 11th months of the AEP Dayton Hub LMP peak electricity futures contract will remain the same. Margins for all other months will increase to $2,000 from $1,500 for clearing members, to $2,200 from $1,650 for members, and to $2,700 from $2,025 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: Brenda Guzman, 212-299-2436

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