BRADENTON, Fla. — Moody's Investors Service said Tuesday that $2.7 billion of bonds issued by the Municipal Electric Authority of Georgia could be downgraded if early uncertainties in the construction of two nuclear units in Georgia lead to higher costs cost and further delays beyond those known so far.

The total cost for the new units 3 and 4 at Plant Vogtle originally was estimated at $14 billion to be shared by Georgia Power Corp. at 45.7%, Oglethorpe Power Cooperative at 30%, MEAG at 22.7%, and the city of Dalton at 1.6%. The units were originally projected to come online in 2016 and 2017.

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