News Release

NYMEX to Change Margins for Financially Settled Electricity Futures Contracts

Tue Jun 06 2006

NEW YORK, N.Y., June 6, 2006— the New York Mercantile Exchange, Inc. announced that it will change margins for several of its NYMEX ClearPort® financially settled electricity futures contracts, at the close of business on tomorrow.

Margins on the first month of the Dow Jones Mid–Columbia electricity price index swap futures contract will increase to $7,000 from $4,500 for clearing members; to $7,700 from $4,950 for members; and to $9,450 from $6,075 for customers. The margins for the second to sixth months will increase to $7,000 from $5,500 for clearing members; to $7,700 from $6,050 for members; and to $9,450 from $7,425 for customers. Margins for the seventh to 11th months will increase to $7,000 from $8,000 for clearing members; to $7,700 from $8,800 for members; and to $9,450 from $10,800 for customers. The margins for all other months will remain the same.

Margins on the first month of the Cinergy Hub LMP – peak futures contract will remain unchanged. The margins for the second to sixth months will increase to $6,000 from $5,500 for clearing members; to $6,600 from $6,050 for members; and to $8,100 from $7,425 for customers. Margins for all other months will remain the same.

The margins on the first to 11th months of the NYISO Zone J – peak futures contract will remain the same. Margins for 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.

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Forward Looking and Cautionary Statements
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Contact: Brenda Guzman , 212-299-2436

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