Union Electric Company (Ameren Missouri) Rate Selection Guide
Union Electric Company, operating as Ameren Missouri, serves roughly 1.26 million electric customers (plus natural gas) across central and eastern Missouri, including St. Louis. As a fully regulated investor-owned utility, it offers AMI-based 15-minute interval data through its Energy Manager dashboard, a benchmarking portal (BEEP) for commercial buildings, and manual authorization forms for third-party data access — but no Green Button Connect My Data or retail-choice EDI.
Union Electric Company (Ameren Missouri) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| 3(M) Large General Service | Commercial | $120.23/mo + summer demand $7.43/kW, energy 6.24–12.33¢/kWh | Secondary-voltage C&I sites with summer demand over 100 kW |
| 11(M) Large Primary Service | Industrial | $412.66/mo + summer energy 4.06¢/kWh, demand $23.90/kW, reactive 44.81¢/kVar | Large primary-voltage industrial loads (≥5,000 kW) |
| Optional TOD | Time-of-day adjustment | +/- per-kWh on-peak/off-peak adjustments | C&I customers able to shift load to off-peak hours |
Market Overview
Ameren Missouri (Union Electric) operates as a vertically integrated, MoPSC-regulated utility with no retail electric competition. Customers cannot select a competitive electricity supplier; generation, transmission, distribution, and supply are all provided by Ameren Missouri at MoPSC-approved rates.
Need to pull your actual usage data to compare rates? See the Union Electric Company (Ameren Missouri) Data Access Guide →
Current Rate Schedules
Ameren Missouri's C&I electric rates are fully regulated by the Missouri PSC and set through rate cases. Large C&I schedules feature seasonal (summer/winter) energy and demand charges, with optional time-of-day adjustments and (for primary service) a reactive/power-factor charge. The figures below come from the current Schedule No. 6 tariff sheets; Rider FAC (fuel adjustment), EEIC, and RESRAM riders also apply to all kWh.
Effective: August 17, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Schedule 3(M) – Large General Service | commercial | Secondary-voltage non-residential customers whose billing demand in any summer month exceeds 100 kW (or by request). | Customer charge $120.23/mo (+ $2.75 Low-Income Pilot). Summer (Jun–Sep): demand $7.43/kW; energy declining-block 12.33¢ (first 150 kWh/kW), 9.27¢ (next 200), 6.24¢ (over 350). Winter (Oct–May): demand $2.76/kW; base energy 7.74¢/5.75¢/4.53¢ by block. Optional TOD energy adjustments apply. Plus FAC/EEIC/RESRAM riders. Effective Aug 17, 2025. | — |
| Schedule 11(M) – Large Primary Service | industrial | Primary-voltage (or higher) service at the customer's request, with a minimum 5,000 kW billing demand. | Customer charge $412.66/mo (+ $291.99 Low-Income Pilot). Summer (Jun–Sep): energy 4.06¢/kWh, demand $23.90/kW, reactive 44.81¢/kVar. Winter (Oct–May): energy 3.71¢/kWh, demand $10.63/kW, reactive 44.81¢/kVar. Billing demand is the greater of peak-hour max or 50% of off-peak max, never below 5,000 kW. Effective Jun 1, 2025. | — |
| Schedule 2(M) – Small General Service | commercial | Small non-residential customers below the Large General Service demand threshold. | Customer charge plus energy and (where applicable) demand charges per the Schedule 2(M) tariff sheet; see the non-residential rates page for current figures. | — |
| Schedule 4(M) – Small Primary Service | industrial | Primary-voltage non-residential customers below the Large Primary threshold. | Customer charge plus seasonal energy and demand charges per the Schedule 4(M) tariff; refer to the tariff sheets for current rate levels. | — |
| Large General / Primary Time-of-Day options | commercial | Large C&I customers electing optional time-of-day (TOD) billing. | Optional TOD energy adjustments layered on the underlying schedule — e.g., 3(M) summer +1.14¢ on-peak / -0.79¢ off-peak; 11(M) summer +0.64¢ / -0.37¢. Minimum 12-month commitment. See tariff sheets for full TOD terms. | — |
Rate Recommendations by Use Case
Mid-size commercial facility (>100 kW summer demand)
Secondary-voltage commercial sites over 100 kW summer demand belong on Schedule 3(M) and should focus on demand management.
3(M)'s $7.43/kW summer demand charge and declining-block energy rates make peak control the main savings lever.
- Use Energy Manager 15-minute data to find peaks
- Consider optional TOD if load is shiftable
- Watch FAC/EEIC/RESRAM riders on all kWh
Large industrial / manufacturing plant (primary voltage)
Primary-voltage plants with ≥5,000 kW demand should take Schedule 11(M) and prioritize power-factor and peak management.
11(M)'s $23.90/kW summer demand and 44.81¢/kVar reactive charge reward peak shaving and PF correction.
- Maintain power factor ≥ 90% lagging to avoid reactive charges
- Shave coincident peaks during 10am–10pm weekday peak window
- Model summer vs. winter demand to plan maintenance outages
Energy / sustainability manager needing data
Use Energy Manager for interval insight and BEEP (or an aggregator) for structured, reportable building data.
With no Green Button, BEEP (CSV/Excel, ENERGY STAR integration) and aggregators are the practical routes to exportable data.
- Set up the building in BEEP for ENERGY STAR benchmarking
- Use Nectar for API-based billing and interval data (docs.nectarclimate.com)
- File a release form for one-time historical pulls
Historical Rate Trends
Ameren Missouri rates are reset periodically through MoPSC rate cases. The current Large Primary (11(M)) sheet was issued under Case No. ER-2024-0319 (effective June 1, 2025); the Large General (3(M)) sheet became effective August 17, 2025.
June 1, 2025
Schedule 11(M) Large Primary Service rates updated pursuant to MoPSC Case No. ER-2024-0319.
n/aAugust 17, 2025
Schedule 3(M) Large General Service rate sheet became effective (8th revised Sheet No. 56).
n/aOverall trend: Rising — successive rate cases have increased C&I base rates; fuel costs flow through the FAC rider.
Next expected change: Subject to the next MoPSC rate case filing; large-load power rate plan approved in 2026 (PSC PR-26-40).
Cost Optimization Strategies
Because demand and reactive charges dominate large C&I bills, the biggest savings come from peak-demand management, power-factor correction, and load shifting to off-peak periods.
Peak-demand management
For: All large C&I accounts
Use 15-minute interval data from Energy Manager to identify and shave coincident peaks; summer demand charges ($7.43/kW on 3(M), $23.90/kW on 11(M)) far exceed winter.
Power-factor correction
For: Primary-service industrial customers
On Schedule 11(M), maintain power factor at or above 90% lagging to avoid the 44.81¢/kVar reactive charge.
Time-of-day load shifting
For: C&I customers with flexible loads
Elect optional TOD and shift discretionary load to off-peak hours to capture per-kWh credits and lower billed demand.
To implement these strategies, you need your 15-minute interval data. Learn how to download Union Electric Company (Ameren Missouri) interval data →
Frequently Asked Questions
Can my energy consultant get our facility's interval data from Ameren Missouri?▾
Yes, but not via Green Button — Ameren Missouri has no Connect My Data program. The customer completes the 'Release of Utility Historical Information' form (specifying 15-minute interval data) for delivery in 5–10 business days, or authorizes Nectar to pull billing and interval data through its API — see docs.nectarclimate.com.
We manage a multi-tenant commercial building — how do we benchmark its energy use?▾
Use the BEEP (Benchmarking & Energy Efficiency Portal) at beep.ameren.com. It provides up to 24 months of aggregated monthly building usage in CSV/Excel and integrates with ENERGY STAR Portfolio Manager, without needing individual tenant releases.
Which rate schedule applies to our large commercial or industrial site?▾
Schedule 3(M) Large General Service applies to secondary-voltage non-residential customers whose summer demand exceeds 100 kW. Schedule 11(M) Large Primary Service applies, at the customer's request, to primary-voltage service with a minimum 5,000 kW billing demand. Both have summer/winter rate differentials and optional time-of-day adjustments.
Does Ameren Missouri let us choose a competitive electricity supplier?▾
No. Missouri is a fully regulated market with no retail electric choice. Ameren Missouri is the sole provider in its territory and rates are set by the Missouri Public Service Commission. The Retail Electric Suppliers portal applies only to Ameren Illinois.
How far back can we get billing and interval data?▾
The online portal shows 2+ years of bills; Energy Manager retains 24+ months of 15-minute interval data. Ameren keeps billing records 7+ years and meter data 5+ years; older records can be requested via the historical-information release form (typically 12–24 months delivered).
Automate Union Electric Company (Ameren Missouri) Rate Analysis with Nectar
Nectar continuously monitors your Union Electric Company (Ameren Missouri) rate options and alerts you when a better schedule is available. Save 10-30% on energy costs.
Nectar for Energy & Sustainability Teams
Managing utility costs for commercial or industrial buildings? Nectar offers a free rate analysis — we'll review your current rate schedules and identify where switching tariffs or shifting load can save 10-30%.
Get a Free Rate AnalysisNectar for Energy Brokers & Consultants
Advising clients on rate optimization? Nectar works with energy consultants who need reliable interval data and automated rate comparison tools.
Partner with Us