Exelon Generation Co LLC, a unit of Exelon Corp, on Wednesday sold $1.5 billion debt in two parts, said a market source familiar with the offering.

The sale was increased in size from an initially planned $1.2 billion, the source added.

The offering included $600 million in 10-year notes priced to yield 175 basis points over comparable U.S. Treasuries and $900 million in 30-year bonds yielding 200 basis points over Treasuries.

The joint lead managers on the sale are Barclays, JPMorgan and Morgan Stanley.

(Reporting by Caryn Trokie; Editing by Dan Grebler)