Moody’s Investor Services downgraded the credit rating of the Bonneville Power Administration (BPA). BPA goes to an “Aa1” rating from “Aaa,” impacting $6.3 billion in outstanding debt. The outlook was set at “stable.” Moody’s said the downgrade reflects BPA’s increased “hydrology and market price risk,” which has eroded its credit quality during the last several years. Financial reserves available to handle increased risk have dropped by 36% during the two-year period ending with fiscal year 2010, Moody’s said. The ratings agency said it expects the challenges for BPA to continue in the form of “low natural gas prices, sustained lower demand and increasing amounts of wind generation during BPA’s peak surplus energy sales season.”

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