Toshiba Corp. is in final talks with two U.S. utility firms over four planned nuclear reactor projects in the U.S. worth a combined ¥1.5 trillion, company sources said Thursday.

Toshiba is negotiating with Scana Corp. over the construction of two reactors in South Carolina and is finalizing deals with Southern Co. for the construction of two reactors in Georgia, the sources said.

Major U.S. nuclear plant developer Westinghouse Electric Co., which became a wholly owned unit of Toshiba in 2006, is handling the negotiations, they said.