Wednesday’s storms took out all of TVA’s electric power transmission lines in Mississippi and North Alabama, and forced Browns Ferry Nuclear Plant unto diesel backup power and into emergency and automatic cold shutdown. Bill McCollum, the chief operating officer of Tennessee Valley Authority, said it may be weeks before power can be restored to all of the 300,000 customers whose power is supplied by the federal utility. “With the level of damage we have, it will be — we hope it will be days until we get most of the customers back on, but it will be weeks before we’ve...