News Release

Exchange Changes Margins for Natural Gas Swing Swap Futures Contracts

Mon Aug 29 2005

NEW YORK, N.Y., August 29, 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 $1,700 from $1,200 for clearing members, to $1,870 from $1,320 for members, and to $2,295 from $1,452 for customers.

Margins for Kern River and PG&E City Gate swing swap futures contracts will be increased to $2,100 from $1,600 for clearing members, to $2,310 from $1,760 for members, and to $2,835 from $1,936 for customers.

Margins for the San Juan swing swap futures contract will be increased to $2,700 from $2,200 for clearing members, to $2,970 from $2,420 for members, and to $3,645 from $2,662 for customers.

Margins for the SoCal swing swap futures contracts will be increased to $2,900 from $$2,400 for clearing members, to $3,190 from $2,640 for members, and to $3,915 from $2,904 for customers.

Margins for the Sumas swing swap futures contracts will be increased to $1,900 from $1,400 for clearing members, to $2,090 from $1,540 for members, and to $2,565 from $1,694 for customers.

Margins for the TETCO M-3 and Transco Zone 6 swing swap futures contracts will be increased to $1,800 from $1,300 for clearing members, to $1,980 from $1,440 for members, and to $2,430 from $1,573 for customers. Margins for the Henry Hub swing swap futures contract will be increased to $2,125 from $1,625 for clearing members, to $2,338 from $1,788 for members, and to $2,869 from $1,966 for customers.

Margins on all months of the Chicago City Gate, El Paso Permian, Houston Shop Channel, Panhandle, and Waha swing swap futures contracts will be increased to $2,375 from $1,875 for clearing members, to $2,613 from $2,063 for members, and to $3,206 from $2,269 for customers.

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