News Release

NYMEX to Change Margins for Financially Settled Electrucity Futures Contracts

Wed Sep 20 2006

New York, N.Y., September 20, 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 month of the PJM Western Hub LMP monthly peak electricity futures contract will decrease to $8,000 from $10,000 for clearing members, to $8,800 from $11,000 for members, and to $10,800 from $13,500 for customers. Margins for the second to fourth months will decrease to $7,000 from $8,000 for clearing members, to $7,700 from $8,800 for members, and to $9,450 from $10,800 for customers. Margins for the fifth and sixth months will decrease to $3,000 from $4,000 for clearing members, to $3,300 from $4,400 for members, and to $4,050 from $5,400 for customers. Margins for the seventh and eighth months will decrease to $5,000 from $6,000 for clearing members, to $5,500 from $6,600 for members, and to $6,750 from $8,100 for customers. Margins for the ninth to 12th months will decrease to $4,000 from $5,000 for clearing members, to $4,400 from $5,500 for members, and to $5,400 from $6,750 for customers. Margins for the 13th to 16th months will decrease to $2,500 from $3,500 for clearing members, to $2,750 from $3,850 for members, and to $3,375 from $4,725 for customers. Margins for all other months will decrease to $2,000 from $3,000 for clearing members, to $2,200 from $3,300 for members, and to $2,700 from $4,050 for customers.

Margins for the first month of the NYISO Zone A, Zone G, and Zone J peak electricity futures contract will decrease to $4,500 from $5,000 for clearing members, to $4,950 from $5,500 for members, and to $6,075 from $6,750 for customers. Margins for second to sixth months will decrease to $3,500 from $4,000 for clearing members, to $3,850 from $4,400 for members, and to $4,725 from $5,400 for customers. Margins for seventh to 11th months will decrease to $4,000 from $4,500 for clearing members, to $4,400 from $4,950 for members, and to $5,400 from $6,075 for customers. Margins for all other months will decrease to $2,000 from $2,500 for clearing members, to $2,200 from $2,750 for members, and to $2,700 from $3,375 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.

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