On 9 June 2010, the company was rated BBB+/A-2; Outlook stable, by the Standard & Poor’s rating agency, which is a “strong investment grade” level.
This rating has been confirmed by Standard & Poor’s in a press release dated April 27, 2012.

Standard & Poor’s uses the restated FFO /restated net debt (according to the Standard & Poor’s method) to determine this rating.