News Release

Exchange to Change Margins for Some Financially Settled Monthly Electricity Futures Contracts

Thu Dec 15 2005

NEW YORK, N.Y., December 15, 2005 -- The New York Mercantile Exchange, Inc., today announced that it will increase the margins for its ISO New England internal hub location marginal pricing swap futures peak and off-peak contracts; and the Northern Illinois hub monthly electricity futures peak and off-peak contracts, effective at the close of business tomorrow.

Margins for the ISO New England internal hub location marginal pricing swap futures peak contract will increase to $4,000 from $2,000 for clearing members, to $4,400 from $2,200 for members, and to $5,400 from $2,700 for customers.

Margins for the ISO New England internal hub location marginal pricing swap futures off-peak 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.

Margins for the Northern Illinois hub monthly electricity futures peak contract 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 the Northern Illinois hub monthly electricity futures off-peak contract 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.


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