(Reuters) - Westinghouse Electric Co LLC, the nuclear power plant developer owned by Japanese electronics company Toshiba Corp 6502.T, is taking offers for a financing package to help it go through U.S. bankruptcy, people familiar with the matter said on Monday.

FILE PHOTO: The logo of Toshiba Corp. is seen at the company's facility in Kawasaki, Japan February 13, 2017. REUTERS/Issei Kato/File Photo

Toshiba is reviewing proposals from financial institutions and investment firms about a so-called debtor-in-possession loan, which would carry the company through a potential bankruptcy, said two people familiar with the situation. The size of this financing package is expected to exceed $500 million, the people added.

Should it file for bankruptcy, the money would allow Westinghouse to continue to pay employees and build four nuclear power plants in Georgia and South Carolina, commissioned by local utility companies. These would be the first nuclear power plants built in the United States in more than 30 years.

The sources cautioned that the move is preparatory and that no decision has yet been made for Westinghouse to file for bankruptcy. They asked not to be identified because the deliberations are confidential.

Reuters reported earlier this month that Westinghouse was working with bankruptcy attorneys and a turnaround expert.

Toshiba has so far said it was considering several options for Westinghouse, including selling the unit.

Toshiba and Westinghouse did not immediately respond to requests for comment.

Toshiba has said it would take a $6.3 billion writedown related to Westinghouse, and gained an extension from Japanese regulators until April 11 to submit financial results or face having its public shares delisted from the Tokyo Stock Exchange.

The power plants Westinghouse is building are called the Virgil C. Summer Nuclear Generating Station in Fairfield County, South Carolina and the Vogtle Electric Generating Plant in Burke County, Georgia. Scana Corp SCG.N and Santee Cooper own the plants in South Carolina, and Georgia Power leads a consortium that commissioned the Georgia plants.

“We will continue to hold (Westinghouse) accountable for their responsibilities under our agreement,” Georgia Power said in a statement. “Work continues to progress at the Vogtle site, we are monitoring the situation and prepared for any potential outcome.”

A spokeswoman for Scana said that “with approximately 5,700 contractor and subcontractor personnel on site today, we continue to make progress with construction of these new units.”

In a potential Westinghouse bankruptcy, the utility companies would be among the largest creditors of the developer, owed the work that has yet to be completed and potential penalties, according to the sources.

The exploding population in the southeastern United States spurred the development of the plants, which were first approved by regulators in 2012.

Nuclear power fell out of favor in the United States after a partial nuclear meltdown at Three Mile Island in central Pennsylvania in the late 1970s.

Toshiba’s acquisition of Westinghouse about 10 years ago for $5.4 billion represented a major bet on a renaissance of the fuel. But the projects now face long construction delays and billions of dollars in cost overruns.