News Release

NYMEX to Change Margins for Financially Settled Electricity Futures Contracts

Wed Aug 01 2007


New York, N.Y., August 1, 2007 -- The New York Mercantile Exchange, Inc. today announced margin changes for some of its financially settled electricity futures contracts on NYMEX ClearPort®, effective at the close of business tomorrow.

Margins for the first month of the Dow Jones Mid-Columbia and Dow Jones South Path-15 index swap electricity futures contracts will increase to $10,000 from $9,000 for clearing members, to $11,000 from $9,900 for members, and to $13,500 from $12,150 for customers. The margins for all other months will remain unchanged.

Margins for the first to 11th months of the Dow Jones Palo Verde index swap electricity futures contract will remain unchanged. The margins for all other months 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 first to 11th months of the Cinergy Hub LMP peak, Northern Illinois Hub peak, and AEP-Dayton Hub peak electricity futures contracts will remain unchanged. Margins for all other 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 the first to sixth months of the PJM Western LMP peak monthly electricity futures contract will remain unchanged. Margins for the seventh and eighth months will increase to $4,500 from $3,500 for clearing members, to $4,950 from $3,850 for members, and to $6,075 from $4,725 for customers. The margins for the ninth and 10th 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. Margins for the 11th and 12th 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. The margins for the 13th to 16th months will 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. Margins for all other months will remain unchanged.

The margins for the first month of the NYISO Zone A peak and NYISO Zone G peak electricity futures contracts will increase to $4,500 from $3,500 for clearing members, to $4,950 from $3,850 for members, and to $6,075 from $4,725 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.

The margins for the first month of the NYISO Zone A off-peak and 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 the second to sixth months will remain unchanged. The margins for the seventh to 11th months will increase to $4,500 from $3,000 for clearing members, to $4,950 from $3,300 for members, and to $6,075 from $4,050 for customers. The margins for all other months will remain the same.

Margins for the first month of the NYISO Zone G 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. The margins for the second to sixth months will remain unchanged. Margins for the seventh to 11th months will increase to $4,500 from $2,500 for clearing members, to $4,950 from $2,750 for members, and to $6,075 from $3,375 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 NYISO Zone J peak electricity futures contracts will increase to $4,500 from $3,500 for clearing members, to $4,950 from $3,850 for members, and to $6,075 from $4,725 for customers. The margins for all other months will remain the same.

Margins for the first to sixth months of the ISO New England Internal Hub peak electricity futures contracts will remain unchanged. Margins for the seventh to 11th months will increase to $4,500 from $3,500 for clearing members, to $4,950 from $3,850 for members, and to $6,075 from $4,725 for customers. The margins for all other 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 the first to sixth months of the ISO New England Internal Hub off-peak electricity futures contracts will remain unchanged. The margins for the seventh to 11th months will increase to $4,000 from $3,000 for clearing members, to $4,400 from $3,300 for members, and to $5,400 from $4,050 for customers. Margins for all other months will remain the same.

 The margins for the first to 11th months of the Northern Illinois Hub off-peak index swap electricity futures contracts 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.

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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 or  Keil Decker, 212-299-2209

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