NRG Energy (NYSE:NRG – Get Free Report) and Ameren (NYSE:AEE – Get Free Report) are both large-cap utilities companies, but which is the better stock? Get NRG Energy alerts:Gross Revenue Price/Sales Ratio Net Income Earnings Per Share Price/Earnings Ratio NRG Energy $30.71 billion 0.86 $864.00 million $0.85 147.49 Ameren $8.80 billion 3.48 $1.46 billion $5.56 19.88Risk and VolatilityAmeren has lower revenue, but higher earnings than NRG Energy. Given NRG Energy’s stronger consensus rating and higher possible upside, analysts plainly believe NRG Energy is more favorable than Ameren. Net Margins Return on Equity Return on Assets NRG Energy 0.74% 70.67% 4.95% Ameren 17.17% 10.94% 2.99%Insider and Institutional Ownership97.7% of NRG Energy shares are held by institutional investors. Receive News & Ratings for NRG Energy Daily - Enter your email address below to receive a concise daily summary of the latest news and analysts' ratings for NRG Energy and related companies with MarketBeat.com's FREE daily email newsletter.