Duke Energy Florida marketed $1.3 billion of bonds backed by utility fees as a corporate bond; it managed to convinced many investors, but not the big three rating agencies, which classified the offering as structured finance. The company's regulator, the Florida Public Service Commission, filed complaints with the European Securities and Markets Authority, the body that, since 2010, body has required rating agencies to add a two-letter identifier, sf, to ratings of transactions that meet its definition of structured finance