Ameren Corp. Files 2026 Integrated Resource Plan for Ameren Missouri

What Happened
Ameren Corporation reported that Union Electric Company, doing business as Ameren Missouri, filed a non‑binding 2026 Integrated Resource Plan (2026 IRP) with the Missouri Public Service Commission on September 28, 2026. The IRP sets out Ameren Missouri’s preferred plan to meet projected long‑term customer demand and includes large capacity additions across natural gas, solar, wind, battery storage, fuel cells and new nuclear, along with retirements and life‑extension decisions for existing plants. The filing also presents load growth scenarios (about 2.9–3.9 GW by 2030; 5–6 GW by 2035; 6–9 GW by 2045).

Key Details

• Ameren Missouri’s preferred additions include: 2,100 MW combined‑cycle gas by 2031, +2,800 MW by 2035, +1,400 MW by 2042.
• Other planned additions: 1,900 MW simple‑cycle gas by 2029 (plus 2,400 MW by 2045); 500 MW gas fuel cells by 2030; 1,300 MW solar by 2030 (+1,050 MW by 2035); 1,500 MW wind by 2040; 2,400 MW battery storage by 2030; 1,200 MW new nuclear by 2040.
• Plant changes: extend retirement of two Labadie coal units from 2036 to 2042; retire ~1,800 MW of natural gas centers by 2040; seek NRC approval to extend Callaway nuclear’s operating license beyond its current 2044 expiration.
• The IRP is non‑binding and Ameren highlights numerous regulatory, construction, fuel, interconnection, tax‑credit and demand‑growth risks that could change outcomes.

Why It Matters
For investors, the IRP signals a major shift in Ameren Missouri’s planned generation mix and likely future capital spending profile—more investment in natural gas, renewables, battery storage and new nuclear capacity, plus retirements of some fossil assets. The plan’s cost recovery and timing depend on regulatory approvals (MoPSC CCNs, rate proceedings) and other approvals such as NRC license extensions and MISO interconnections. The filing also emphasizes load growth drivers (including new large customers) and lists many factors that could affect actual results, so the IRP outlines intentions and scenarios rather than guaranteed outcomes.