News Release

NYMEX to Change Margins for Financially Settled Electricity Futures Contracts

Thu Feb 01 2007

New York, N.Y., February 1, 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 Cinergy Hub LMP peak electricity futures contract will increase to $6,500 from $5,000 for clearing members, to $7,150 from $5,500 for members, and to $8,775 from $6,750 for customers. The margins for the second to sixth months will increase to $5,500 from $5,000 for clearing members, to $6,050 from $5,500 for members, and to $7,425 from $6,750 for customers. Margins for all other months will remain unchanged.

The margins for the Michigan Hub LMP peak electricity futures contract will increase to $6,500 from $5,000 for clearing members, to $7,150 from $5,500 for members, and to $8,775 from $6,750 for customers.

Margins for the first month of the PJM Western Hub LMP peak monthly electricity futures contract will increase to $10,000 from $5,500 for clearing members, to $11,000 from $6,050 for members, and to $13,500 from $7,425 for customers. The margins for the second to fourth months will increase to $7,500 from $5,500 for clearing members, to $8,250 from $6,050 for members, and to $10,125 from $7,425 for customers. Margins for the fifth to sixth months will increase to $6,000 from $3,500 for clearing members, to $6,600 from $3,850 for members, and to $8,100 from $4,725 for customers. The margins for all other months will remain the same.

Margins for the first month of the PJM Western Hub LMP off-peak monthly electricity futures contract will remain increase to $4,000 from $3,500 for clearing members, to $4,400 from $3,850 for members, and to $5,400 from $4,725 for customers. The margins for all other months will increase will remain unchanged.

Margins for the first month of the NYISO Zone A, NYISO Zone G, and NYISO Zone J peak electricity futures contracts 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 the second to sixth months 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. Margins for all other months will remain the same.

The margins for the first month of the NYISO Zone A and NYISO Zone G off-peak electricity futures contracts will increase to $6,000 from $3,000 for clearing members, to $6,600 from $3,300 for members, and to $8,100 from $4,050 for customers. Margins for all other months will remain unchanged.

The margins for the first month of the NYISO Zone J off-peak electricity futures contracts will increase to $6,000 from $5,000 for clearing members, to $6,600 from $5,500 for members, and to $8,100 from $6,750 for customers. 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 contracts will increase to $9,500 from $6,000 for clearing members, to $10,450 from $6,600 for members, and to $12,825 from $8,100 for customers. Margins for the second to sixth months will increase to $7,500 from $4,000 for clearing members, to $8,250 from $4,400 for members, and to $10,125 from $5,400 for customers. The margins for all other months will remain unchanged.

Margins for the first month of the ISO New England Internal Hub off-peak electricity futures contracts will increase to $6,000 from $4,000 for clearing members, to $6,600 from $4,400 for members, and to $8,100 from $5,400 for customers. The margins for all other months will remain unchanged.

The margins for the first month of the Northern Illinois Hub and AEP Dayton Hub peak electricity futures contracts will increase to $9,000 from $5,000 for clearing members, to $9,900 from $5,500 for members, and to $12,150 from $6,750 for customers. Margins for the second to sixth months will increase to $7,000 from $5,000 for clearing members, to $7,700 from $5,500 for members, and to $9,450 from $6,750 for customers. The margins for the seventh to 11th months will increase to $6,000 from $3,000 for clearing members, to $6,600 from $3,300 for members, and to $8,100 from $4,050 for customers. Margins for all other months will remain the same.

The margins for the first month of the AEP Dayton Hub off-peak electricity futures contracts 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 the second to 11th months will remain unchanged. The margins for all other months will increase to $2,500 from $1,500 for clearing members, to $2,750 from $1,650 for members, and to $3,375 from $2,025 for customers.

The margins for the ERCOT seller's choice peak swap electricity futures contract will increase to $6,000 from $3,500 for clearing members, to $6,600 from $3,850 for members, and to $8,100 from $4,725 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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