News Release

NYMEX to Change Margins for Financially Settled Electricity Futures Contracts

Tue May 02 2006

NEW YORK, N.Y., May 2, 2006 — The New York Mercantile Exchange, Inc., announced that it will change margins for its financially settled electricity futures contracts, at the close of business on tomorrow.

Margins for the first month of the Cinergy hub LMP off peak futures contract will decrease to $3,000 from $4,000 for clearing members; to $3,300 from $4,400 for members; and to $4,050 from $5,400 for customers. The margins for the second through sixth months will decrease to $4,000 from $6,000 for clearing members; to $4,400 from $6,600 for members; and to $5,400 from $8,100 for customers. Margins for all other months remain unchanged.

The margins for the second through sixth months of the Northern Illinois hub peak futures contract will decrease to $10,000 from $12,000 for clearing members; to $11,000 from $13,200 for members; and to $13,500 from $16,200 for customers. Margins for all other months remain unchanged.

Margins for the second through sixth months of the AEP–Dayton hub peak futures contract will decrease to $10,000 from $11,500 for clearing members; to $11,000 from $12,650 for members; and to $13,500 from $15,525 for customers. Margins for all other months remain unchanged.

Margins for the first month of the AEP–Dayton hub off peak futures contract will decrease to $3,000 from $5,500 for clearing members; to $3,300 from $6,050 for members; and to $4,050 from $7,425 for customers. The margins for the second through sixth months will decrease to $4,000 from $6,000 for clearing members; to $4,400 from $6,600 for members; and to $5,400 from $8,100 for customers. The margins for the seventh through 11th months will increase to $4,500 from $3,000 for clearing members; to $4,950 from $3,300 for members; and to $6,075 from $4,050 for customers. Margins for all other months remain unchanged.

The margins for the first month of the NYISO Zone A peak futures contract will not change. Margins for the second through sixth months will increase to $4,500 from $2,500 for clearing members; to $4,950 from $2,750 for members; and to $6,075 from $3,375 for customers. The margins for the seventh to 11th months will remain unchanged. The margins for all other months will decrease to $2,500 from $4,500 for clearing members; to $2,750 from $4,950 for members; and to $3,375 from $6,075 for customers.

Margins for the first month of the NYISO Zone G peak futures contract will remain unchanged. Margins in the second to sixth months will increase to $4,500 from $2,500 for clearing members; to $4,950 from $2,750 for members; and to $6,075 from $3,375 for customers. The margins for the seventh through 11th months will increase to $4,500 from $4,000 for clearing members; to $4,950 from $4,400 for members; and to $6,750 from $5,400 for customers. Margins for all other months will decrease to $2,500 from $4,000 for clearing members; to $2,750 from $4,400 for members; and to $3,375 from $5,400 for customers.

Margins for the first month of the NYISO zone J off peak futures contract remain unchanged. Margins for the second to sixth 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. The margins for the seventh through 11th months will not change. Margins on all other months will decrease to $3,000 from $5,000 for clearing members; to $3,300 from $5,500 for members; and to $4,050 from $6,750 for customers.

Margins for the first month of the NYISO Zone A, Zone G and Zone J off peak, ISO New England internal hub - off peak, and PJM Western hub LMP off peak futures contracts will remain unchanged. The margins for the second through sixth months will increase to $9,000 from $5,000 for clearing members; to $9,900 from $5,500 for members; and to $12,150 from $6,750 for customers. The margins on the seventh to 11th months will increase to $6,000 from $4,000 for clearing members; to $6,600 from $4,400 for members; and to $8,100 from $5,400 for customers. Margins on all other months will not change.

Margins for the first month of the Dow Jones SP15 electricity prices index swap futures contracts 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. The margins for the second through sixth months will increase to $8,000 from $6,000 for clearing members; to $8,800 from $6,600 for members; and to $10,800 from $8,100 for customers. Margins for the seventh through 11th 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. The margins on all other months will increase to $7,000 from $4,000 for clearing members; to $7,700 for $4,400 for members; and to $9,450 from $5,400 for customers.

Margins for the first month of the Dow Jones NP15 electricity prices index swap futures contract will increase to $8,000 from $5,500 for clearing members; to $8,800 from $6,050 for members; and to $10,800 from $7,425 for customers. The margins for the second through sixth months will increase to $8,000 from $6,000 for clearing members; to $8,800 from $6,600 for members; and to $10,800 from $8,100 for customers. Margins for the seventh through 11th months will increase to $7,000 from $5,000 for clearing members; to $7,700 from $5,500 for members; and $9,450 from $6,750 for customers. The margins on all other months will increase to $7,000 from $4,000 for clearing members; to $7,700 from $4,400 for members; and to $9,450 from $5,400 for customers.

Margins for the first through sixth months of the Dow Jones Mid–Columbia electricity prices index swap futures contract will not change. The margins for the seventh through 11th months will increase to $8,000 from $4,000 for clearing members; to $8,800 from $4,400 for members; and to $10,800 from $5,400 for customers. The margins on all other months will remain unchanged.

Margins for the first month of the Dow Jones Palo Verde electricity prices index swap futures contract will increase to $7,000 from $5,000 for clearing members; to $7,700 from $5,500 for members; and to $9,450 from $6,750 for customers. The margins for the second through sixth months will increase to $8,000 from $5,500 for clearing members; to $8,800 from $6,050 for members; and to $10,800 from $7,425 for customers. Margins for the seventh through 11th months increase to $7,000 from $5,000 for clearing members; to $7,700 from $5,500 for members; and to $9,450 from $6,750 for customers. The margins on all other months will increase to $7,000 from $4,000 for clearing members; to $7,700 from $4,400 for members; and to $9,450 from $5,400 for customers

# # #


Forward Looking and Cautionary Statements
This press release may contain forward–looking statements within the meaning of the Private Securities Litigation Reform Act, with respect to our future performance, operating results, strategy, and other future events. Such statements generally include words such as could, can, anticipate, believe, expect, seek, pursue, and similar words and terms, in connection with any discussion of future results. Forward–looking statements involve a number of assumptions, risks, and uncertainties, any of which may cause actual results to differ materially from the anticipated, estimated, or projected results referenced in forward–looking statements. In particular, the forward–looking statements of NYMEX Holdings, Inc., and its subsidiaries are subject to the following risks and uncertainties: the success and timing of new futures contracts and products; changes in political, economic, or industry conditions; the unfavorable resolution of material legal proceedings; the impact and timing of technological changes and the adequacy of intellectual property protection; the impact of legislative and regulatory actions, including without limitation, actions by the Commodity Futures Trading Commission; and terrorist activities and international hostilities, which may affect the general economy as well as oil and other commodity markets. We assume no obligation to update or supplement our forward–looking statements.

Contact: Anu Ahluwalia , 212-299-2439

Corporate Communications

+1 312 930 3434
Email