Client: Sierra Club
Authors: Bryndis Woods, PhD and Joshua R. Castigliego
July 2026
AEC assisted Sierra Club with its submission of Comments on Ameren Missouri, LLC’s 2026 Integrated Resource Plan Initial Assumptions. Sierra Club’s comments addressed recommendations for Ameren in its forthcoming IRP, including issues related to the Company’s assumptions regarding: energy efficiency, large load customers, coal plant retirements, tax credit eligibility for wind and solar resources, carbon price forecasts, costs of new gas resources, gas price forecasts, and carbon capture and storage costs.