Detailed Narrative
Economic Development and Data Center Demand
Ameren continues to see robust interest and strong momentum from data center developers and hyperscalers, expecting approximately 5.5% compound annual sales growth in Missouri from 2025 through 2029. The company has executed construction agreements for 2.3 gigawatts of future demand, with load expected to ramp up from late 2026. Developers have made $28 million in nonrefundable payments for transmission upgrades, and are requesting studies for expanding existing data center projects, indicating potential growth beyond 2032.
Generation Resource Development
To support growing demand, Ameren Missouri is accelerating generation portfolio additions. A Certificate of Convenience and Necessity (CCN) was requested for the Big Hollow Energy Center, an 800 MW natural gas facility with 400 MW battery storage, expected in-service by 2028. Equipment procurement has begun for a combined cycle energy center, with turbine purchase commitments expected by year-end and in-service by 2031. The company is proactively managing supply chain risks by securing long lead time components.
Missouri Large Load Rate Structure
Ameren Missouri filed a proposed large load rate structure with the Missouri PSC in May. This structure would deliver service under the existing large primary service base rate (approximately $0.06 per kilowatt hour) with additional terms in Electric Service Agreements (ESAs), including a 15-year minimum service term and a 70% minimum demand charge. The goal is to ensure large customers pay their fair share of service costs, with a PSC decision expected by February 2026.
MISO Long-Range Transmission Planning
Ameren is focused on building Tranche 1 and Tranche 2.1 long-range transmission planning projects and developing proposals for competitive Tranche 2.1 projects. The $6.5 billion portfolio bidding process will occur over 2025-2026. MISO's future scenario redesign efforts are expected to show significant transmission investment needs, with a final report outlining four scenarios due in early 2026, leading to specific investment identification in late 2026.
Federal Tax and Energy Policy
Energy-related tax credits are expected to provide approximately $1.5 billion in cost savings for customers from 2025 through 2029. This includes $750 million from wind and solar projects (in-service or planned by 2027), $250 million from battery projects (construction starting this year), and $500 million from additional solar projects (construction starting this year). The company feels well-positioned to realize these credits under the One Big Beautiful Bill Act (OBBBA).
Illinois Regulatory Proceedings
In Illinois, the ICC staff recommended a $49 million reconciliation adjustment for the 2024 electric multiyear rate plan, compared to Ameren's $60 million request, with a decision expected by mid-December. For the natural gas distribution rate review, staff recommended a $103 million annual base rate increase, lower than the $135 million requested, based on a 9.93% return on equity and 50% common equity ratio. A decision is expected by early December.