An anonymous reader writes: Westinghouse Electric Co, a unit of Japanese conglomerate Toshiba Corp, filed for bankruptcy on Wednesday, hit by billions of dollars of cost overruns at four nuclear reactors under construction in the U.S. Southeast. The bankruptcy casts doubt on the future of the first new U.S. nuclear power plants in three decades, which were scheduled to begin producing power as soon as this week, but are now years behind schedule. The four reactors are part of two projects known as V.C. Summer in South Carolina, which is majority owned by SCANA Corp, and Vogtle in Georgia, which is owned by a group of utilities led by Southern Co. Costs for the projects have soared due to increased safety demands by U.S. regulators, and also due to significantly higher-than-anticipated costs for labor, equipment and components. Pittsburgh-based Westinghouse said it hopes to use bankruptcy to isolate and reorganize around its "very profitable" nuclear fuel and power plant servicing businesses from its money-losing construction operation. Westinghouse said in a court filing it has secured $800 million in financing from Apollo Investment Corp, an affiliate of Apollo Global Management, to fund its core businesses during its reorganization. Westinghouse’s nuclear services business is expected to continue to perform profitably over the course of the bankruptcy and eventually be sold by Toshiba, people familiar with the matter said. When regulators in Georgia and South Carolina approved the construction of Westinghouse's AP1000 reactors in 2009, it was meant to be the start of renewed push to develop U.S. nuclear power. However, a flood of cheap natural gas from shale, the lack of U.S. legislation to curb carbon emissions and the 2011 Fukushima nuclear accident in Japan dampened enthusiasm for nuclear power. Toshiba had acquired Westinghouse in 2006 for $5.4 billion. It expected to build dozens of its new AP1000 reactors — which were hailed as safer, quicker to construct and more compact — creating a pipeline of work for its maintenance division.