News Release

Exchange Changes Margins for Natural Gas Swing Swap Futures Contracts

Wed Aug 31 2005

NEW YORK, N.Y., August 31, 2005 — The New York Mercantile Exchange, Inc., today announced margin rates change for its natural gas swing swap futures contracts, effective at the close of business today.

Margins for the Dominion index swap futures contracts will be increased to $2,125 from $1,700 for clearing members, to $2,338 from $1,870 for members, and to $2,869 from $2,295 for customers.

Margins for Kern River and PG&E City Gate swing swap futures contracts will be increased to $2,626 from $2,100 for clearing members, to $2,888 from $2,310 for members, and to $3,544 from $2,835 for customers.

Margins for the San Juan swing swap futures contract will be increased to $3,375 from $2,700 for clearing members, to $3,713 from $2,970 for members, and to $4,556 from $3,645 for customers.

Margins for the SoCal swing swap futures contracts will be increased to $3,625 from $2,900 for clearing members, to $3,988 from $3,190 for members, and to $4,894 from $3,915 for customers.

Margins for the Sumas swing swap futures contracts will be increased to $2,375 from $1,900 for clearing members, to $2,613 from $2,090 for members, and to $3,206 from $2,565 for customers.

Margins for the TETCO M-3 and Transco Zone 6 swing swap futures contracts will be increased to $2,250 from $1,800 for clearing members, to $2,475 from $1,980 for members, and to $3,038 from $2,430 for customers.

Margins for the Chicago City Gate, El Paso Permian, Houston Ship Channel, Panhandle, and Waha swing swap futures contracts will be increased to $2,969 from $2,375 for clearing members, to $3,266 from $2,613 for members, and to $4,008 from $3,206 for customers.

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