June 20 (UPI) -- Apollo, a U.S. asset management group, plans to provide a $6 billion loan to the British nuclear project Hinkley Point C being built by a French multinational electric utility company. Hinkley's estimated cost has soared from $23.7 billion to almost $60.6 billion and won't be operational until at least 2029, Baha Breaking News reported . Construction began in 2017. Apollo will provide an investment-grade debt financing package at an interest rate below 7% for the project