Standard & Poors (S&P) issued its full rating review of ENMAX Corporation in September of 2010, affirming its BBB+ rating and revising its outlook on ENMAX from 'negative' to 'stable'. On March 31, 2011 and February 29, 2012, S&P issued  summary reports re-iterating its assessment.

On January 26, 2012, Dominion Bond Rating Service confirmed ENMAX Corporation’s Unsecured Debentures rating to be A (low) and its Commercial Paper rating to be R-1 (low); both with stable trends.