AMEREN CORP. $47(www.ameren.com) provides power and natural gas to 3.3 million clients in Illinois and Missouri. The company’s revenue rose just 0.7% in 2015, to $6.10 billion from $6.05 billion in 2014. That’s mainly because warmer-than-usual weather hurt gas demand. Earnings per share rose 6.7%, to $2.56 from $2.40. Ameren expects its 2016 earnings will decline to $2.50 a share due to the bankruptcy of Noranda Aluminum, its biggest power customer in Missouri. Hold.