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Supplemental Information Iowa Daily Commodity Prices December 2006 Date Gas Cost Component ($/Therm) 12/01/2006 $0.84461 12/02/2006 $0.84107 12/03/2006 $0.84107 12/04/2006 $0.84107 12/05/2006 $0.78756 12/06/2006 $0.75273 12/07/2006 $0.76282 12/08/2006 $0.76888 12/09/2006 $0.73405 12/10/2006 $0.73405 12/11/2006 $0.73405 12/12/2006 $0.67397 12/13/2006 $0.70477 12/14/2006 $0.73001 12/15/2006 $0.72698 12/16/2006 $0.69972 12/17/2006 $0.69972 12/18/2006 $0.69972 12/19/2006 $0.67750 12/20/2006 $0.64671 12/21/2006 $0.66589 12/22/2006 $0.63055 12/23/2006 $0.61894 12/24/2006 $0.61894 12/25/2006 $0.61894 12/26/2006 $0.61894 12/27/2006 $0.59572 12/28/2006 $0.57149 12/29/2006 $0.58108 12/30/2006 $0.58108 12/31/2006 $0.58108 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.