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Supplemental Information PGA Summaries: Nebraska Navigator PGA Summaries: 2008 | 2007 | 2006 Purchased Gas Adjustments During 2007 (per therm) Northern Natural Gas Company Revision No. Effective Date Clause 1 Clause 2 Sm. & Med. Volume Firm Large Volume Firm Demand Commodity 146th Rev. Sh. No. 44   1/07/07 .95576 .72445 .86847 147th Rev. Sh. No. 44   2/07/07 .94453 .72445 .83676 148th Rev. Sh. No. 44   3/07/07 .85929 .72445 .76335 149th Rev. Sh. No. 44   4/07/07 .92579 .72445 .90437 150th Rev. Sh. No. 44   5/07/07 .89675 .72445 .80760 151st Rev. Sh. No. 44   6/07/07 .92873 .72445 .80338 152nd Rev. Sh. No. 44   7/07/07 .94165 .72445 .81766 153rd Rev. Sh. No. 44   8/07/07 .87704 .72445 .74816 154th Rev. Sh. No. 44   9/07/07 .72499 .72445 .69212 155th Rev. Sh. No. 44 10/07/07 .74635 .72445 .69346 156th Rev. Sh. No. 44 11/07/07 .87728 .75106 .82136 157th Rev. Sh. No. 44 12/07/07 .86649 .75106 .82351 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.