Ameren Missouri Rate Case

Photo Credit: Missouri Department of Natural Resources

Client: Sierra Club

Author: Tyler Comings

April 2023

Senior Researcher Tyler Comings filed testimony before the Missouri Commission on Ameren Missouri's rate case. Mr. Comings argued that Ameren should be considering earlier retirement of its coal units, especially given pending environmental regulations and lower-cost clean replacement options. He also recommended that Ameren be asked to identify capital costs that could be avoided should they be retired earlier than currently planned.

 Link to Testimony

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Evergy Missouri IRP Comments

Client: The Sierra Club

Authors: Senior Researcher Tyler Comings and Researcher Joshua Castigliego

Senior Researcher Tyler Comings and Researcher Joshua Castigliego assisted the Sierra Club in comments on the Evergy Missouri Integrated Resource Plan (IRP). AEC had several criticisms of the Evergy plan, including that the company 1) failed to choose one of its alternative plans that was lower-cost and had accelerated coal unit retirements; 2) failed to conduct true optimization of coal unit retirements; 3) inflated the costs of new renewable resources; and 4) failed to consider any battery storage.

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Comments on Evergy Missouri's Integrated Resource Plan

Source: Missouri Independent

Client: Sierra Club

Authors: Tyler Comings and Joshua Castigliego

September 2021

Senior Researcher Tyler Comings and Researcher Joshua Castigliego co-authored comments with Sierra Club on Evergy Missouri's Integrated Resource Plan (IRP). AEC found several deficiencies in the utility's plan including: 1) the lack of optimization modeling, 2) limited consideration of battery storage, 3) failure to model power purchase agreements (PPAs), and 4) failure to consider other coal retirement portfolios (among others).

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Ameren MO IRP Comments

Source: USFWS Midwest Region

Authors: Tyler Comings, Joshua Castigliego, Sagal Alisalad, Eliandro Tavares, and Sierra Club

March 2021

AEC co-authored (with Sierra Club) comments on the Integrated Resource Plan (IRP) from Ameren Missouri. The comments discuss Ameren's failure to: economically optimize coal unit retirements, adequately address substantial costs from pending litigation, and adequately consider low-cost solar and solar-battery hybrid resources.

Link to Comments

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