WASHINGTON — The nearly $30 billion in economic damages caused by Hurricane Sandy will not have a detrimental effect on the creditworthiness of U.S. debt, but it is likely to have negative consequences for mid-Atlantic electric utility companies, according to a new credit outlook by Moody's Investors Service.

The rating agency released the 45-page outlook Monday analyzing the credit implications from Hurricane Sandy. Moody's said approximately half of the estimated $30 billion cleanup-bill will be covered by insurance companies but nearly $10 billion will still need to be covered by the federal government.

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