Ameren is repositioning Missouri from a historically slow-growth utility toward a large-load buildout driven by data centers, manufacturing and electrification. Its prior 2025 resource plan already contemplated 1.5 GW of new demand by 2032 and a substantially larger generation program, so the strategic direction was known rather than a clean surprise.
The new filing materially raises the scale of the demand opportunity. Ameren Missouri’s 2026 IRP sets out high-load scenarios of approximately 2.9–3.9 GW by 2030, 5–6 GW by 2035 and 6–9 GW by 2045. 〔0〕
| Demand scenario | Filing figure |
|---|---|
| High-load growth by 2030 | 2.9–3.9 GW |
| High-load growth by 2035 | 5–6 GW |
| High-load growth by 2045 | 6–9 GW |
The resource strategy shifts from incremental planning to a broad capacity-construction cycle. The preferred plan calls for significant investment across gas generation, renewables, batteries and new nuclear capacity while retiring coal and some existing gas facilities. 〔1〕 That supports a larger long-term regulated asset base if the projects are approved and built, but the filing itself does not authorize construction or guarantee that the projected load arrives.
The main tension is scale versus certainty. This is a non-binding integrated resource plan, and the demand assumptions are materially higher than Ameren’s older baseline but still depend on prospective large customers actually locating and operating in Missouri. The plan therefore strengthens the growth narrative, while also increasing exposure to regulatory approval, construction execution and the risk of building ahead of realized demand.
Bottom line: This advances Ameren’s growth story by putting a much larger power requirement on the planning map, but it is still a roadmap—not secured demand, approved projects or near-term earnings guidance.
Read the original 8-K on SEC EDGAR ↗