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Supplemental Information PGA Summaries: Nebraska Navigator PGA Summaries: 2009 | 2008 | 2007 Purchased Gas Adjustments During 2009 (per therm) Northern Natural Gas Company Revision No. Effective Date Clause 1 Clause 2 Sm. & Med. Volume Firm Large Volume Firm Demand Commodity 170th Rev. Sh. No. 44 1/07/09   0.87912 0.79686 0.85048 171st Rev. Sh. No. 44 2/07/09   0.74631 0.79686 0.79228 172nd Rev. Sh. No. 44 3/07/09   0.68564 0.79686 0.66963 173rd Rev. Sh. No. 44 4/07/09   0.66527 0.79686 0.63338 174th Rev. Sh. No. 44 5/07/09   0.37879 0.79686 0.31241 175th Rev. Sh. No. 44 6/07/09   0.46742 0.79686 0.32349 176th Rev. Sh. No. 44 7/07/09   0.58056 0.79686 0.41925 177th Rev. Sh. No. 44 8/07/09   0.57391 0.79686 0.43994 178th Rev. Sh. No. 44 9/07/09   0.43548 0.79686 0.38996 179th Rev. Sh. No. 44 10/07/09   0.49968 0.79686 0.45568 180th Rev. Sh. No. 44 11/07/09   0.58795 0.92032 0.50709 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.