TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	September 29, 2006
SUBJECT:	Chicago Climate Exchange October 2006 SFI Expiration Month Margin

The following margin change will be effective at the close of business on Friday September 29, 2006:

Chicago Climate Exchange SFI Expiration Month Margin Rate	From	To
October 2006 Sulfur Dioxide	$975	$1,475

Should you have any questions, please call or e-mail one of the following Client Services and Support Representatives: