News Release

NYMEX to Change Margins for Financially Settled Electricity Futures Contracts

Thu Aug 03 2006

New York, N.Y., August 1, 2006 — The New York Mercantile Exchange, Inc. today announced today announced margin changes its financially settled electricity futures contracts on NYMEX ClearPort®, beginning at the close of business tomorrow.

Margins for the PJM weekly electricity futures contracts will increase to $4,000 from $3,000 for clearing members, to $4,400 from $3,330 for members, and to $5,400 from $4,050.

The margins for the PJM daily peak and AEP-Dayton hub daily peak electricity futures contracts will increase to $3,000 from $2,000 for clearing members, to $3,300 from $2,200 for members, and to $4,050 from $2,700.

Margins for the Northern Illinois hub daily peak electricity futures contracts 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.

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Contact: Anu Ahluwalia, 212-299-2439

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