OATI webOASIS

9/10/2007:� �� FERC Order 890 Compliance

Due to the substantial changes to the Pro-Forma OATT made by Order 890, Western Area Power Administration will need to engage in a public process with its customers and the general public prior to making an Order 890 filing.� Western will make a future filing to address the changes necessary as a result of Order 890.� However, in the interim Western will continue to work with the industry and complying with the spirit and intent of Order 890 when feasible.

1/25/2005: �� OATT Revision & LGIP Agreement:

The Western Area Power Administration (Western) has filed a revised Open Access Transmission Service Tariff (Tariff) with the Federal Energy Regulatory Commission. Western�s existing Tariff was approved by the Federal Energy Regulatory Commission (Commission) on April 12, 2002. Western updated certain Tariff provisions, adopted the principal features of the Commission�s Standard Large Generator Interconnection Procedures (LGIP) and Standard Large Generator Interconnection Agreement (LGIA) consistent with applicable law, and made additional changes to further Western�s mission and transmission marketing efforts. The revised Tariff, a summary of changes made to its existing Tariff, and information about the tariff revision process is posted on Western�s Web site at http://www.wapa.gov/oatt.htm