News Release

NYMEX Announces Margins for New Electricity Contracts

Thu Jul 20 2006

New York, N.Y., July 20, 2006 — The New York Mercantile Exchange, Inc., today announced the margin rates for the 12 new electricity futures contracts that begin will trading on NYMEX ClearPort® on July 23 for trade date July 24.

The margin rates for the ERCOT seller's choice peak swap (Platts Megawatt Daily) futures contract will be $1,500 for clearing members, $1,650 for members, and $2,025 for customers.

Margin rates for the ERCOT Houston calendar day peak swap (Platts Megawatt Daily) and ERCOT North MCPE trading hub calendar day peak futures contracts will be $2,500 for clearing members, $2,750 for members, and $3,375 for customers.

The margin rates for the ERCOT North calendar day peak swap (Platts Megawatt Daily) and ERCOT hub average MCPE trading hub calendar day peak swap futures contracts will be $2,000 for clearing members, $2,200 for members, and $2,700 for customers.

Margin rates for the ERCOT Houston MCPE trading hub calendar day peak swap futures contract will be $3,000 for clearing members, $3,300 for members, and $4,050 for customers.

The margin rates for the ERCOT seller's choice peak swap (Platts Megawatt Daily) futures contract will be $4,500 for clearing members, $4,950 for members, and $6,075 for customers.

The margin rates for the ERCOT Houston peak swap (Platts Megawatt Daily) and ERCOT North peak swap (Platts Megawatt Daily) futures contracts will be $7,000 for clearing members, $7,700 for members, and $9,450 for customers.

Margin rates for the ERCOT hub average MCPE trading hub peak swap futures contract will be $5,000 for clearing members, $5,500 for members, and $6,750 for customers.

Margin rates for the ERCOT Houston MCPE trading hub peak swap and ERCOT North MCPE trading hub peak swap futures contracts will be $7,500 for clearing members, $8,250 for members, and $10,125 for customers.

Spot month margins will decline automatically during the pricing month for the ERCOT seller's choice peak swap (Platts Megawatt Daily), ERCOT Houston peak swap (Platts Megawatt Daily), ERCOT North peak swap (Platts Megawatt Daily), ERCOT hub average MCPE trading hub peak swap, ERCOT Houston MCPE trading hub peak swap, and ERCOT North MCPE trading hub peak swap futures contracts. The spot month margin will decay by dividing one by the number of business days during the month.

The intra-commodity spread margin rate for all of the contracts will be $250 for clearing members, $275 for members, and $338 for customers.

Contact: Brenda Guzman , 212-299-2436

Corporate Communications

+1 312 930 3434
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