HomeWattCost

Ameren Missouri 1(M) Evening/Morning vs 1(M) Overnight

For a typical Missouri home using 1,039 kWh a month, 1(M) Overnight is cheaper by about $41 a year ($142 against $145 a month). 1(M) Overnight is cheaper below about 1,450 kWh a month and 1(M) Evening/Morning above it, with the same daily pattern of use.

Utility Ameren MissouriTariffs checked 2026-10-12Typical use 1,039 kWh/mo, Missouri

Head to head

Scenario1(M) Evening/Morning1(M) OvernightCheaper
Typical home, per month$145$1421(M) Overnight
All-in price per kWh14.0¢13.6¢1(M) Overnight
Home + EV, charged at the cheapest hour$175$1631(M) Overnight
Home + EV, plugged in at 6 pm$176$1801(M) Evening/Morning
Fixed charge$9.19$9.19

Typical home: Missouri average use by month (EIA), shaped hour by hour (NREL ResStock), before taxes. EV: Tesla Model Y Long Range AWD, 1,000 miles a month; cheapest start 12 am on 1(M) Evening/Morning, 12 am on 1(M) Overnight.

Month by month

Typical-home bill each month on each plan.

PlanJanFebMarAprMayJunJulAugSepOctNovDec
1(M) Evening/Morning$145$124$108$96$102$193$242$233$172$99$101$128
1(M) Overnight$145$120$100$85$94$195$245$235$175$90$91$125

1(M) Evening/Morning: price by hour

July weekday.

Off-peakPeak
16.2¢16.8¢16.2¢12a3a6a9a12p3p6p9p12a

1(M) Overnight: price by hour

July weekday.

Off-peakPeak
8.3¢19.4¢8.3¢12a3a6a9a12p3p6p9p12a

1(M) Evening/Morning or 1(M) Overnight: common questions

Is 1(M) Evening/Morning or 1(M) Overnight cheaper?

For a typical Missouri home using 1,039 kWh a month, 1(M) Overnight is cheaper by about $41 a year ($142 against $145 a month). 1(M) Overnight is cheaper below about 1,450 kWh a month and 1(M) Evening/Morning above it, with the same daily pattern of use. Adding an EV driven 1,000 miles a month and charged at each plan’s cheapest hour, 1(M) Overnight gives the lower total ($163 against $175 a month).

What is the difference between 1(M) Evening/Morning and 1(M) Overnight?

1(M) Evening/Morning is time-of-use (summer weekdays: Peak 9 am–9 pm; lowest price 9 pm–9 am next day), with a fixed charge of $9.19 a month. 1(M) Overnight is time-of-use (summer weekdays: Peak 6 am–10 pm; lowest price 10 pm–6 am next day), with a fixed charge of $9.19 a month.

More Ameren Missouri comparisons

How the two plans work

1(M) Evening/Morning: Evening/Morning Savers

  • Peak 9 am–9 pm on July weekdays; 12 of 24 hours carry the top price of 16.8¢.
  • The cheapest July weekday hour costs 16.2¢, so moving 1 kWh out of the top hours saves 0.6¢.
  • In January every hour costs the same (8.0¢).
  • Summer pricing applies Jun–Sep; winter pricing Oct–May.
  • Fixed charge: $9.19 a month.

1(M) Overnight: Overnight Savers

  • Peak 6 am–10 pm on July weekdays; 16 of 24 hours carry the top price of 19.4¢.
  • The cheapest July weekday hour costs 8.3¢, so moving 1 kWh out of the top hours saves 11.1¢.
  • January weekdays range from 7.3¢ to 11.3¢.
  • Summer pricing applies Jun–Sep; winter pricing Oct–May.
  • Fixed charge: $9.19 a month.

Your own pattern of use decides the winner: compare every Ameren Missouri plan on your usage, or see all Ameren Missouri plans, sources and peak hours.