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Supplemental Information PGA Summaries: Iowa Navigator PGA Summaries: 2008 | 2007 | 2006 Purchased Gas Adjustments During 2006 (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 130th Rev. Sh. No. W-4   1/07/06 1.01940 .06308 .72494 .96351 131st Rev. Sh. No. W-4   2/07/06   .97782 .06308 .72494 .97021 132nd Rev. Sh. No. W-4   3/07/06   .86600 .06308 .72494 .82395 133rd Rev. Sh. No. W-4   4/07/06   .73795 .06308 .72494 .70723 134th Rev. Sh. No. W-4   5/07/06   .59285 .06308 .72494 .66739 135th Rev. Sh. No. W-4   6/07/06   .47522 .06311 .72494 .56551 136th Rev. Sh. No. W-4   7/07/06   .48357 .06311 .72494 .58303 138th Rev. Sh. No. W-4   8/07/06   .54785 .06311 .72494 .67675 139th Rev. Sh. No. W-4   9/07/06   .61600 .06692 .72494 .62376 140th Rev. Sh. No. W-4 10/07/06   .43081 .06692 .72494 .42556 141st Rev. Sh. No. W-4 11/07/06   .78417 .06955 .72445 .83656 142nd Rev. Sh. No. W-4 12/07/06   .78256 .06955 .72445 .83363 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 130th Rev. Sh. No. E-20  1/07/06 1.08248 131st Rev. Sh. No. E-20  2/07/06 1.04090 132nd Rev. Sh. No. E-20  3/07/06   .92908 133rd Rev. Sh. No. E-20  4/07/06   .80103 134th Rev. Sh. No. E-20  5/07/06   .65593 135th Rev. Sh. No. E-20  6/07/06   .53833 136th Rev. Sh. No. E-20  7/07/06   .54668 138th Rev. Sh. No. E-20  8/07/06   .61096 139th Rev. Sh. No. E-20  9/07/06   .68292 140th Rev. Sh. No. E-20 10/07/06   .49773 141st Rev. Sh. No. E-20 11/07/06   .85372 142nd Rev. Sh. No. E-20 12/07/06   .85211 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.