News Release

NYMEX to Change Margins for Financially Settled Electricity Futures Contracts

Mon Jan 08 2007

New York, N.Y., January 8, 2007 — 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 Dow Jones North Path-15, Dow Jones Mid-Columbia, Dow Jones Palo Verde, and Dow Jones South Path-15 index swap electricity futures contracts will decrease to $10,000 from $11,000 for clearing members, to $11,000 from $12,100 for members, and to $13,500 from $14,850 for customers. The margins for the second to sixth months will decrease to $9,000 from $10,000 for clearing members, to $9,900 from $11,000 for members, and to $12,150 from $13,500 for customers. The margins for all other months will remain unchanged.

Margins for the first to sixth months of the Cinergy Hub LMP peak electricity futures contract will remain the same. Margins for the seventh to 11th months will increase to $3,000 from $2,000 for clearing members, to $3,300 from $2,200 for members, and to $4,050 from $2,700 for customers. The margins for all other months will increase to $2,500 from $2,000 for clearing members, to $2,750 from $2,200 for members, and to $3,375 from $2,700 for customers.

Margins for the first month of the Cinergy Hub LMP off-peak electricity futures contract will remain unchanged. The margins for the second to sixth months will decrease to $2,500 from $3,000 for clearing members, to $2,750 from $3,300 for members, and to $3,375 from $4,050 for customers. Margins for the seventh to 11th 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. The 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.

Margins for the MISO Illinois LMP peak futures contract 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 the first month of the PJM Western Hub LMP peak monthly electricity futures contract will decrease to $5,500 from $6,000 for clearing members, to $6,050 from $6,600 for members, and to $7,425 from $8,100 for customers. The margins for the second to fourth months 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 the fifth to eighth 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. The margins for the ninth to12th months will decrease to $2,500 from $3,000 for clearing members, to $2,750 from $3,300 for members, and to $3,375 from $4,050 for customers. Margins for the 13th to 16th months will increase to $3,500 from $2,500 for clearing members, to $3,850 from $2,750 for members, and to $4,725 from $3,375 for customers. The margins for all other months will increase to $3,500 from $2,000 for clearing members, to $3,850 from $2,200 for members, and to $4,725 from $2,700 for customers.

Margins for the first month of the PJM Western Hub LMP off-peak electricity futures contract 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. The margins for all other months will remain the same.

Margins for the first month of the NYISO Zone A and NYISO Zone G peak electricity futures contracts will decrease to $2,500 from $3,000 for clearing members, to $2,750 from $3,300 for members, and to $3,375 from $4,050 for customers. The margins for all other months will remain unchanged.

Margins for the first month of the NYISO Zone A off- peak electricity futures contract will increase to $3,000 from $2,500 for clearing members, to $3,300 from $2,750 for members, and to $4,050 from $3,375 for customers. The margins for the second to sixth months will decrease to $3,000 from $5,000 for clearing members, to $3,300 from $5,500 for members, and to $4,050 from $6,750 for customers. Margins for all other months will remain unchanged.

Margins for the first month of the NYISO Zone G off- peak electricity futures contract will remain the same. The margins for the second to sixth months will decrease to $3,000 from $5,000 for clearing members, to $3,300 from $5,500 for members, and to $4,050 from $6,750 for customers. Margins for the seventh to 11th months will increase to $2,500 from $2,000 for clearing members, to $2,750 from $2,200 for members, and to $3,375 from $2,700 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 decrease to $2,500 from $3,000 for clearing members, to $2,750 from $3,300 for members, and to $3,375 from $4,050 for customers. The margins for the second to 11th months will remain unchanged. 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.

Margins for the first month of the ISO New England Internal Hub peak electricity futures contract will decrease to $6,000 from $7,000 for clearing members, to $6,600 from $7,700 for members, and to $8,100 from $9,450 for customers. The margins for the second to sixth 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. The margins for all other months will remain the same.

Margins for the first to sixth months of the Northern Illinois Hub and AEP Dayton Hub peak electricity futures contract will remain unchanged. The margins for the seventh to 11th months will increase to $3,000 from $2,000 for clearing members, to $3,300 from $2,200 for members, and to $4,050 from $2,700 for customers. Margins for all other months will increase to $2,500 from $2,000 for clearing members, to $2,750 from $2,200 for members, and to $3,375 from $2,700 for customers.

The margins for the first month of the Northern Illinois Hub off-peak electricity futures contract will increase to $3,000 from $2,500 for clearing members, to $3,300 from $2,750 for members, and to $4,050 from $3,375 for customers. The margins for all other months will remain unchanged.

Margins for the first to sixth months of the AEP Dayton Hub off-peak electricity futures contract will remain the same. The margins for the seventh to 11th 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. Margins for all other months will decrease to $1,500 from $2,000 for clearing members, to $1,650 from $2,200 for members, and to $2,025 from $2,700 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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