Duke Energy Corp (DUK.N) on Tuesday launched its $1 billion two-part note sale, with pricing expected later on Tuesday, said IFR, a Thomson Reuters service.

The offering was increased from an initially planned $800 million, according to IFR.

The sale includes $500 million in five-year notes expected to yield 145 basis points over comparable U.S. Treasuries and $500 million in 10-year notes expected to yield 160 basis points over Treasuries.

The joint lead managers on the sale are Bank of New York, Credit Suisse, JP Morgan and RBS. (Reporting by Caryn Trokie)