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Supplemental Information PGA Summaries: Iowa Navigator PGA Summaries: 2009 | 2008 | 2007 Purchased Gas Adjustments During 2009 (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 169th Rev. Sh. No. W-4 1/07/09  0.62277  0.07415 0.79686 0.70566 170th Rev. Sh. No. W-4 2/07/09  0.33868 0.07415 0.79686 0.56806 171st Rev. Sh. No. W-4 3/07/09  0.40080 0.07415 0.79686 0.59911 172nd Rev. Sh. No. W-4 4/07/09  0.25109 0.07415 0.79686 0.36369 173rd Rev. Sh. No. W-4 5/07/09  0.18747 0.07415 0.79686 0.31388 174th Rev. Sh. No. W-4 6/07/09  0.16445 0.07415 0.79686 0.32485 175th Rev. Sh. No. W-4 7/07/09  0.18594 0.07415 0.79686 0.35930 176th Rev. Sh. No. W-4 8/07/09  0.16492 0.07415 0.79686 0.35162 178th Rev. Sh. No. W-4 9/07/09  0.29117 0.07205 0.79686 0.29433 179th Rev. Sh. No. W-4 10/07/09  0.40928 0.07205 0.79686 0.40448 180th Rev. Sh. No. W-4 11/07/09  0.47563 0.07885 0.92032 0.50230 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 169th Rev. Sh. No. E-20 1/07/09  0.69692 170th Rev. Sh. No. E-20 2/07/09  0.41283 171st Rev. Sh. No. E-20 3/07/09  0.47495 172nd Rev. Sh. No. E-20 4/07/09  0.32524 173rd Rev. Sh. No. E-20 5/07/09  0.26162 174th Rev. Sh. No. E-20 6/07/09  0.23860 175th Rev. Sh. No. E-20 7/07/09  0.26009 176th Rev. Sh. No. E-20 8/07/09  0.23907 178th Rev. Sh. No. E-20 9/07/09  0.36322 179th Rev. Sh. No. E-20 10/07/09  0.48133 180th Rev. Sh. No. E-20 11/07/09  0.55448 Navigator PGA Summaries: 2009 | 2008 | 2007 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.