Ameren Corporation's fourth quarter earnings missed the Zacks Consensus Estimate. However, year over year earnings improved. The company’s shares outperformed its industry in the past year. Over the long term, it expects to spend up to $13.3 billion on supporting overall system reliability, environmental compliance and infrastructural upgrades. In renewables, Ameren plans to offer electricity through cleaner and more diverse sources of energy generation. However, the company’s aging infrastructure might pose risks to system reliability and force it to incur unplanned capital expenditures, escalating its operating costs, in turn. Ameren's generation and delivery facilities are also subject to risks associated with breakdown or failure of equipment or processes due to fuel supply or transportation disruptions, accidents and labor disputes.