News Release

NYMEX to Change Margins for Electricity Futures Contracts on NYMEX ClearPort®

Mon Aug 04 2008

New York, N.Y., August 4, 2008 -- The New York Mercantile Exchange, Inc. today announced margin changes for some of its 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 $8,000 from $5,000 for clearing members, to $8,800 from $5,500 for members, and to $10,800 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. Margins for the seventh to 12th months will remain unchanged. Margins for all other months will decrease to $5,000 from $5,500 for clearing members, to $5,500 from $6,050 for members, and to $6,750 from $7,425 for customers.

Margins for the Michigan hub LMP peak electricity futures contract will increase to $8,000 from $6,500 for clearing members, to $8,800 from $7,150 for members, and to $10,800 from $8,775 for customers.

Margins for the first month of the Dow Jones Mid-Columbia electricity price index swap futures contract will increase to $8,000 from $7,000 for clearing members, to $8,800 from $7,700 for members, and to $10,800 from $9,450 for customers. Margins for all other months will remain unchanged.

Margins for the first month of the ERCOT North Peak swap (Platts Megawatt Daily) electricity futures contract will decrease to $12,000 from $15,000 for clearing members, to $13,200 from $16,500 for members, and to $16,200 from $20,250 for customers. Margins for the second to sixth months will be $10,000 for clearing members, $11,000 for members, and $13,500 for customers. Margins for the seventh to 12th months will be $8,000 for clearing members, $8,800 for members, and $10,800 for customers. Margins for all other months will be $7,000 for clearing members, $7,700 for members, and $9,450 for customers.

Margins for the first month of the Northern Illinois hub off-peak electricity futures will increase to $5,000 from $3,000 for clearing members, to $5,500 from $3,300 for members, and to $6,750 from $4,050 for customers. Margins for the second to sixth months will increase to $3,000 from $1,500 for clearing members, to $3,300 from $1,650 for members, and to $4,050 from $2,025 for customers.  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. 

Margins for the first month of the AEP Dayton hub off-peak electricity futures contract will increase to $5,000 from $4,000 for clearing members, to $5,500 from $4,400 for members, and to $6,750 from $5,400 for customers. Margins for the second to sixth months will increase $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 the seventh to 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. 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.

Margins for the first month of the Cinergy hub LMP off-peak electricity futures contract will increase to $5,000 from $4,000 for clearing members, to $5,500 from $4,400 for members, and to $6,750 from $5,400 for customers. Margins for the second to sixth months will increase to $4,000 from $2,500 for clearing members, to $4,400 from $2,750 for members, and to $5,400 from $3,375 for customers. Margins for the seventh to 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. 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. 

Margins for the Michigan hub LMP off-peak electricity futures contract will increase to $5,000 from $3,500 for clearing members, to $5,500 from $3,850 for members, and to $6,750 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: Anu Ahluwalia, 212-299-2439 or Brenda Guzman, 212-299-2436

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