AMEREN CORP
For the period ended Sep 30, 2025. Filed Nov 6, 2025.
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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.
Sep 30, 2025 · Filed Nov 6, 2025
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Glossary of Terms and Abbreviations
We use the words “our,” “we” or “us” with respect to certain information that relates to Ameren, Ameren Missouri, and Ameren Illinois, collectively. When appropriate, subsidiaries of Ameren Corporation are named specifically as their various business activities are discussed. Refer to the Form 10-K for a complete listing of glossary terms and abbreviations. Only new or significantly changed terms and abbreviations are included below.
2023 PRP – Preferred Resource Plan, Ameren Missouri’s preferred plan for meeting customers’ projected long-term energy needs, which was filed with the MoPSC in September 2023 as a part of its integrated resource plan.
2025 Change to the 2023 PRP– A change to Ameren Missouri’s 2023 PRP filed with the MoPSC in February 2025 reflecting certain modifications to Ameren Missouri’s preferred plan for meeting customers’ projected long-term energy needs.
Form 10-K – The combined Annual Report on Form 10-K for the year ended December 31, 2024, filed by the Ameren Companies with the SEC.
OBBBA – The One Big Beautiful Bill Act, federal legislation enacted in July 2025.
QTD – Three months ended September 30.
YTD– Nine months ended September 30.
YoY– Compared with the year-ago period.
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