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Supplemental Information PGA Summaries: Iowa Navigator PGA Summaries: 2008 | 2007 | 2006 Purchased Gas Adjustments During 2007 (per therm) MidAmerican Energy Company (West System) Northern Natural Gas, ANR and NGPL Pipelines: Revision No. Effective Date SVF/MVF/SGS LVF Gas Supply Charge Pipeline Transport Charge Demand Gas Supply Charge 143rd Rev. Sh. No. W-4   1/07/07 .76842 .06955 .72445 .78106 144th Rev. Sh. No. W-4   2/07/07 .83279 .06955 .72445 .79853 145th Rev. Sh. No. W-4   3/07/07 .84956 .06955 .72445 .74810 146th Rev. Sh. No. W-4   4/07/07 .73903 .06955 .72445 .80708 147th Rev. Sh. No. W-4   5/07/07 .73047 .06955 .72445 .73611 148th Rev. Sh. No. W-4   6/07/07 .69972 .06955 .72445 .74484 149th Rev. Sh. No. W-4   7/07/07 .58744 .06955 .72445 .66591 151st Rev. Sh. No. W-4   8/07/07 .46796 .06955 .72445 .58195 152nd Rev. Sh. No. W-4   9/07/07 .51065 .06709 .72445 .53058 153rd Rev. Sh. No. W-4 10/07/07 .59947 .06709 .72445 .59985 154th Rev. Sh. No. W-4 11/07/07 .72606 .06879 .75106 .75799 155th Rev. Sh. No. W-4 12/07/07 .74192 .06879 .75106 .77185 MidAmerican Energy Company (East System) Northern Natural Gas, ANR and NGPL Pipelines: Revision No. Effective Date Rider No. 6 Clause 1 Rates 60, 70, 87 & 90 143rd Rev. Sh. No. E-20   1/07/07 .83797 144th Rev. Sh. No. E-20   2/07/07 .90234 145th Rev. Sh. No. E-20   3/07/07 .91911 146th Rev. Sh. No. E-20   4/07/07 .80858 147th Rev. Sh. No. E-20   5/07/07 .80002 148th Rev. Sh. No. E-20   6/07/07 .76927 149th Rev. Sh. No. E-20   7/07/07 .65699 151st Rev. Sh. No. E-20   8/07/07 .53751 152nd Rev. Sh. No. E-20   9/07/07 .57774 153rd Rev. Sh. No. E-20 10/07/07 .66656 154th Rev. Sh. No. E-20 11/07/07 .79485 155th Rev. Sh. No. E-20 12/07/07 .81071 Navigator PGA Summaries: 2008 | 2007 | 2006 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 | ©2008 MidAmerican Energy Holdings Company. All rights reserved.