News Release

Exchange to Change Margins for Financially Settled Electricity Contracts

Wed Dec 28 2005

NEW YORK, N.Y., December 28, 2005 — The New York Mercantile Exchange, Inc., today announced margin changes for its ISO New England internal hub location marginal pricing swap futures peak and off–peak contracts, Northern Illinois hub monthly electricity futures – peak, Dow Jones South Path 15 electricity price index futures, Dow Jones North Path – 15 electricity price index futures, Dow Jones Mid–Columbia electricity price index futures, Dow Jones Palo Verde electricity price index futures, and the PJM monthly futures - peak contracts, effective at the close of business tomorrow.

The margins on the ISO New England internal hub LMP swap futures peak futures contract 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 on the ISO New England internal hub LMP swap futures off–peak futures contract will increase to $5,500 from $3,500 for clearing members, to $6,050 from $3,850 for members, and to $7,425 from $4,725 for customers.

Margins on the Northern Illinois hub monthly electricity futures – peak contract 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.

The margins on the first month of the Dow Jones South Path – 15 electricity price index futures contract will remain unchanged. The margins on the second month will increase to $8,000 from $4,000 for clearing members, to $8,800 from $4,400 for members, and to $10,800 from $5,400 for customers. Margins on all other months 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 on the first month of the Dow Jones North Path – 15 electricity price index futures contract will remain unchanged. The margins on the second month will increase to $9,000 from $4,500 for clearing members, to $9,900 from $4,950 for members, and to $12,150 from $6,075 for customers. The margins on all other months 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.

The margins on the first month of the Dow Jones Mid–Columbia electricity price index futures contract will remain unchanged. Margins on the second month will increase to $9,000 from $4,500 for clearing members, to $9,900 from $4,950 for members, and to $12,150 from $6,075 for customers. The margins on all other months will remain the same.

The margins on the first month of the Dow Jones Palo Verde electricity price index futures contract will remain unchanged. Margins on the second month will increase to $10,000 from $8,000 for clearing members, to $11,000 from $8,800 for members, and to $13,500 from $10,800 for customers. The margins on all other months will remain the same.

Margins on the first month of the PJM monthly futures – peak contract will increase to $8,500 from $7,000 for clearing members, to $9,350 from $7,700 for members, and to $11,475 from $9,450 for customers. The margins on the second month will increase to $7,500 from $7,000 for clearing members, to $8,250 from $7,700 for members, and to $10,125 from $9,450 for customers. The margins on all other months will remain the same.

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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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