ATLANTA – As the cost of building a new nuclear plant soars, there are signs of buyer’s remorse.

The second-guessing from officials in Georgia and Florida is a sign that maybe the nation is not quite ready for a nuclear renaissance. On top of construction costs running much higher than expected, the price of natural gas has plummeted, making it tough for nuclear plants to compete in the energy market.

In Georgia last week, Southern Co. told regulators it needed to raise its construction budget for Plant Vogtle in eastern Georgia by $737 million to $6.85 billion. At about the same time, a Georgia lawmaker sought to penalize the company for going over budget, announcing a proposal to cut into Southern Co.’s profits by trimming some of the money its subsidiary Georgia Power makes.