AUSTIN, Texas--(BUSINESS WIRE)--Fitch Ratings assigns its 'AA' rating to the following bonds issued by the Port of Morrow, Oregon and secured by payments from the Bonneville Power Administration (Bonneville): --Approximately $100 million transmission facilities revenue bonds, series 2015 (taxable). The bonds are scheduled to price on Aug. 19, 2015, via negotiation. Bond proceeds will refund interim financing used to rebuild or reconfigure seven transmission lines and related facilities and pay