Ameren Missouri has filed an application for approval on an energy efficiency investment plan. The Public Service Commission says the application was filed on June 4th. Ameren says it will be the largest energy efficiency program in state history, including 26 programs and $285 million in rebates. Applications to intervene must be filed with the PSC by June 18th. If approved, the effective dates for the plan would be March 1st of 2019 through December 31st of 2024.