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Supplemental Information PGA Summaries: Nebraska Navigator PGA Summaries: 2008 | 2007 | 2006 Purchased Gas Adjustments During 2008 (per therm) Northern Natural Gas Company Revision No. Effective Date Clause 1 Clause 2 Sm. & Med. Volume Firm Large Volume Firm Demand Commodity 158th Rev. Sh. No. 44   1/07/08   .87898 .74994   .81717 159th Rev. Sh. No. 44   2/07/08   .92464 .74994   .82397 160th Rev. Sh. No. 44   3/07/08   .96739 .74994   .84660 161st Rev. Sh. No. 44   4/07/08   .96741 .74994   .84009 162nd Rev. Sh. No. 44   5/07/08 1.19672 .74994 1.04147 163rd Rev. Sh. No. 44   6/07/08 1.23249 .74994 1.08663 164th Rev. Sh. No. 44   7/07/08 1.33314 .74994 1.23028 165th Rev. Sh. No. 44   8/07/08 1.01341 .74994   .93816 166th Rev. Sh. No. 44   9/07/08   .85960 .74994   .84438 167th Rev. Sh. No. 44  10/07/08   .74422 .74994   .72058 168th Rev. Sh. No. 44  11/07/08   .83580 .79003   .82652 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.