Ameren Missouri peak
& off-peak hours
Below is every active TOU rate plan we track for Ameren Missouri — 10 plans — with period boundaries verified against the published tariff. No price values; periods only.
Rate Plans
1M-EMS Residential Evening/Morning Saver
Residential| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Every day | 9 AM – 9 PM |
1M-OS Residential Overnight Saver
Residential| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Every day | 6 AM – 10 PM |
1M-SS Residential Smart Saver
Residential| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | Jun 1 – Sep 30 | Mon–Fri | 3 PM – 7 PM |
| On-Peak | Oct 1 – May 31 | Mon–Fri | 6 AM – 8 AM |
| On-Peak | Oct 1 – May 31 | Mon–Fri | 6 PM – 8 PM |
| Mid-Peak | Jun 1 – Sep 30 | Every day | 6 AM – 10 PM |
| Mid-Peak | Oct 1 – May 31 | Every day | 6 AM – 10 PM |
1M-US Residential Ultimate Saver
Residential| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | Jun 1 – Sep 30 | Mon–Fri | 3 PM – 7 PM |
| On-Peak | Oct 1 – May 31 | Mon–Fri | 6 AM – 8 AM |
| On-Peak | Oct 1 – May 31 | Mon–Fri | 6 PM – 8 PM |
2M-OS Small General Service Optional Overnight Saver
Commercial| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Every day | 6 AM – 10 PM |
2M-TOD Small General Service Legacy Optional Time-of-Day
Commercial| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Mon–Fri | 10 AM – 10 PM |
3M-TOD Large General Service Optional Time-of-Day
Commercial| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Mon–Fri | 10 AM – 10 PM |
11M-LLCS Large Load Customer Service Alternate Time-of-Use
Industrial| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Every day | 9 AM – 9 PM |
11M-TOD Large Primary Service Optional Time-of-Day
Industrial| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Mon–Fri | 10 AM – 10 PM |
4M-TOD Small Primary Service Optional Time-of-Day
Industrial| Period | Season | Days | Hours |
|---|---|---|---|
| On-Peak | All year | Mon–Fri | 10 AM – 10 PM |
Use these Ameren Missouri hours in your app.
Current period and next transition for any ZIP or address.
FAQ's
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What are Ameren Missouri's on-peak hours?
On the 1M-EMS plan (Residential Evening/Morning Saver), on-peak hours run from 9 AM – 9 PM every day. All remaining hours are classified as off-peak.
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Does Ameren Missouri charge more for electricity at certain times?
Yes. Ameren Missouri offers time-of-use (TOU) rate plans where electricity costs vary depending on the period. The period—peak, off-peak, mid-peak, or super off-peak—depends on the time, day, and season. This page lists boundaries for 10 active schedules; tou.tools does not publish pricing ($/kWh) details.
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How do I get Ameren Missouri time-of-use periods in my app?
Schedules are accessible programmatically via the tou.tools REST API and MCP server for AI agents. By querying a U.S. address or ZIP code, your application can instantly retrieve the current period and next scheduled transition time. Developer API keys are free.
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Do Ameren Missouri time-of-use hours change during holidays or seasons?
Yes. Peak hours and rate periods can vary by season (typically summer and winter halves) and special holidays. While some schedules like E-ELEC keep stable hours year-round, others introduce super off-peak windows or adjust peak times. Check each rate plan card above for specific seasonal boundaries.