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Supplemental Information PGA Summaries: Nebraska Navigator PGA Summaries: 2008 | 2007 | 2006 Purchased Gas Adjustments During 2006 (per therm) Northern Natural Gas Company Revision No. Effective Date Clause 1 Clause 2 Sm. & Med. Volume Firm Large Volume Firm Demand Commodity 134th Rev. Sh. No. 44   1/07/06 1.05415 .72494 .92346 135th Rev. Sh. No. 44   2/07/06 1.03683 .72494 .96138 136th Rev. Sh. No. 44   3/07/06 1.01891 .72494 .91918 137th Rev. Sh. No. 44   4/07/06  .90018 .72494 .82978 138th Rev. Sh. No. 44   5/07/06  .89711 .72494 .80026 139th Rev. Sh. No. 44   6/07/06  .82599 .72494 .73060 140th Rev. Sh. No. 44   7/07/06  .87415 .72494 .78342 141st Rev. Sh. No. 44   8/07/06  .89036 .72494 .75670 142nd Rev. Sh. No. 44   9/07/06  .73724 .72494 .69284 143rd Rev. Sh. No. 44 10/07/06  .60757 .72494 .56071 144th Rev. Sh. No. 44 11/07/06  .90828 .72445 .83619 145th Rev. Sh. No. 44 12/07/06  .96451 .72445 .89065 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.