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Supplemental Information Iowa Daily Commodity Prices May 2006 Date Gas Cost Component ($/Therm) 5/01/2006 $0.62563 5/02/2006 $0.61041 5/03/2006 $0.62919 5/04/2006 $0.62462 5/05/2006 $0.62259 5/06/2006 $0.62766 5/07/2006 $0.62766 5/08/2006 $0.62766 5/09/2006 $0.61349 5/10/2006 $0.61955 5/11/2006 $0.62716 5/12/2006 $0.68500 5/13/2006 $0.62868 5/14/2006 $0.62868 5/15/2006 $0.62868 5/16/2006 $0.58504 5/17/2006 $0.59874 5/18/2006 $0.60889 5/19/2006 $0.57794 5/20/2006 $0.57286 5/21/2006 $0.57286 5/22/2006 $0.57286 5/23/2006 $0.59164 5/24/2006 $0.62716 5/25/2006 $0.59468 5/26/2006 $0.57845 5/27/2006 $0.56119 5/28/2006 $0.56119 5/29/2006 $0.56119 5/30/2006 $0.56119 5/31/2006 $0.62563 For Your Home | For Your Business | Safety | Rates | Energy Efficiency | Economic Development | Environmental Efforts About Us | Careers | News Room | Storm Center | Wind Energy | Contact | Streetlight Repair Request | System Outage Watch | Energy Choice | For Contractors | For Landlords | ©2009 MidAmerican Energy Holdings Company. All rights reserved.