Tariffs Recent Filings PGA Summaries Iowa Electric Workshops Supplemental Information Electric Gas Btu Factors Cost of Gas Distribution Charges Energy Efficiency Exit Fees Firm Supply Standby Service Gas Retention Factors Imbalance Cashout Rates Imbalance Charges Interruptible Commodity Prices ISR Margin Manufactured Site Clean-Up RTP Illinois Rider 17 Customer Generation

Supplemental Information Gas: Exit Fees Navigator Exit Fees: 2008 | 2007 | 2006 Gas Transportation Rates - System Exit Fees 2006 Iowa (East & West Systems) - Rider 2 (PDR) and Rider 4 (PTR) Pipeline Demand Rider (PDR) Pipeline Transition Rider (PTR) Effective Date (Month/Year) 70, 87, 90, SGS, SVF & MVF ($/Therm) LVF* SVI & LVI ($/Therm) SVF & MVF ($/Therm) LVF ($/Therm) SVI & LVI ($/Therm) Demand Charge per Contract Demand ($/Therm) Commodity Charge ($/Therm) January 2006 .07005 .72494 .00000 .00000 .00000 .00000 .00000 February 2006 .07005 .72494 .00000 .00000 .00000 .00000 .00000 March 2006 .07005 .72494 .00000 .00000 .00000 .00000 .00000 April 2006 .07005 .72494 .00000 .00000 .00000 .00000 .00000 May 2006 .07005 .72494 .00000 .00000 .00000 .00000 .00000 June 2006 .07007 .72494 .00000 .00000 .00000 .00000 .00000 July 2006 .07007 .72494 .00000 .00000 .00000 .00000 .00000 August 2006 .07007 .72494 .00000 .00000 .00000 .00000 .00000 September 2006 .07432 .72494 .00000 .00000 .00000 .00000 .00000 October 2006 .07432 .72494 .00000 .00000 .00000 .00000 .00000 November 2006 .07705 .72445 .00000 .00000 .00000 .00000 .00000 December 2006 .07705 .72445 .00000 .00000 .00000 .00000 .00000 * The LVF commodity rate includes the PTR exit fee. Continue to charge the PTR exit fee to customer    after cessation of the PDR exit fee. Nebraska - Rider 2 (PDR) and Rider 4 (PTR) Pipeline Demand Rider (PDR) Pipeline Transition Rider (PTR) Effective Date (Month/Year) SVF & MVF ($/Therm) LVF* per Contract Demand ($/Therm) SVI & LVI ($/Therm) SVF & MVF ($/Therm) LVF ($/Therm) SVI & LVI ($/Therm) January 2006 .06364 .72494 None .00000 .00000 None February 2006 .06364 .72494 None .00000 .00000 None March 2006 .06364 .72494 None .00000 .00000 None April 2006 .06364 .72494 None .00000 .00000 None May 2006 .06364 .72494 None .00000 .00000 None June 2006 .06364 .72494 None .00000 .00000 None July 2006 .06364 .72494 None .00000 .00000 None August 2006 .06364 .72494 None .00000 .00000 None September 2006 .06574 .72494 None .00000 .00000 None October 2006 .06574 .72494 None .00000 .00000 None November 2006 .06659 .72445 None .00000 .00000 None December 2006 .06659 .72445 None .00000 .00000 None * PDR for LVF includes PTR charge. Continue to charge the PTR exit fee to customer after cessation of    the PDR exit fee. South Dakota - Rider 2 (PDR) and Rider 4 (PTR) Pipeline Demand Rider (PDR) Pipeline Transition Rider (PTR) Effective Date (Month/Year) SVF, MVF & LVF* ($/Therm) SVI & LVI ($/Therm) SVF, MVF & LVF ($/Therm) SVI & LVI ($/Therm) January 2006 .06791 None .00000 None February 2006 .06791 None .00000 None March 2006 .06791 None .00000 None April 2006 .06791 None .00000 None May 2006 .06791 None .00000 None June 2006 .06791 None .00000 None July 2006 .06791 None .00000 None August 2006 .06791 None .00000 None September 2006 .06736 None .00000 None October 2006 .06736 None .00000 None November 2006 .06969 None .00000 None December 2006 .06969 None .00000 None * PDR for LVF includes PTR charge. Continue to charge the PTR exit fee to customer after cessation of    the PDR exit fee. Illinois - Rider 5 - Transition Costs Sales or Transport Customers in Service on March 23, 1994 and Prior Applicable Rate (Total Cost) Sales or Transport Customers in Service on March 24, 1994 and After Applicable Rate (GSR Only) Effective Date (Month/Year) Per Therm Per Therm January 2006 (.0001) .0000 February 2006 .0000 .0000 March 2006 (.0001) .0000 April 2006 .0000 .0000 May 2006 (.0001) .0000 June 2006 .0000 .0000 July 2006 (.0001) .0000 August 2006 .0000 .0000 September 2006 (.0003) (.0001) October 2006 .0001 .0000 November 2006 (.0005) (.0001) December 2006 .0002 .0000 Navigator Exit Fees: 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.