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Supplemental Information Gas: Imbalance Charges Gas Transportation Rates Rider 8 - Imbalance Charges (Non-Critical) Illinois Effective Level 1 ± 0 to 10% Level 2 ± 10.1 to 20% Level 3 ± 20.1 to 30% Level 4 ± 30.1% February 1, 1996 .021/Therm .023/Therm .025/Therm .100/Therm November 1, 1997 .010/Therm .010/Therm .010/Therm .100/Therm 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.