For the past two years, customers of Florida’s largest electric companies have been paying to build new nuclear power plants that have an escalating price tag and no guarantee of completion. Attorneys for consumers and the state’s largest electricity users are now demanding answers. What they want to know: When will the public see the power plants? How much will they cost customers? And will regulators make sure that the electric companies have skin in the game when their costs climb, such as prohibiting them from passing on cost overruns to customers?