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Tariff data · 2026-08-26
Ameren Illinois Company · IL

DS-1 Residential Zone 3

When does peak hit on Ameren Illinois Company’s DS-1 Residential Zone 3? The hour never matters here — only the season. Rates peak June–September.

  • peak90.88¢
  • off-peak23.27¢
Weekdays
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Weekends
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

What does DS-1 Residential Zone 3 cost a year?

HouseholdUsesPer yearWorks out to
Apartment

One or two people, no central air, no electric heat

4,866 kWh$2,40049.3¢ / kWh
Family home

Three or four people with central air conditioning

9,453 kWh$5,08953.8¢ / kWh
Home with an EV

Same house, plus an electric car charging overnight

13,103 kWh$6,71851.3¢ / kWh

Estimates, not quotes. We run three made-up but realistic households through this tariff hour by hour for a full year — including the way air conditioning loads the afternoon and an EV loads the small hours. Your own bill depends on when you actually use electricity, which is exactly the thing a per-kWh number hides.

What you actually pay

PeriodRateApplies when
peak90.88¢midnight–midnight, June–September
off-peak23.27¢ up to 800 kWh20.21¢midnight–midnight, October–May

Plus a fixed charge of $14.01 per month.

Should you be on DS-1 Residential Zone 3?

The hour of day does not change what you pay here — the month does. Running the same house through the full year, July costs about $1,012 and February about $153. That $859 swing is part rate and part weather, and it is the reason a budget built on your spring bill will break in July.

Before a single kilowatt-hour moves, this plan charges $168 a year in fixed fees. On the apartment above that is 7% of the whole bill; on the house with a car charging in it, 3%. Fixed charges are invisible in a cents-per-kWh comparison and they punish small users hardest — if you use very little electricity, the headline rate is the least important number on this page.

How it compares to Ameren Illinois’s other plans

Measured against the other residential plans this utility files, a family home lands 2nd cheapest of 2. The cheapest option, DS-1 Residential Zone 2, would run about $2,876 a year less.

Against DS-1 Residential Zone 2, which looks like the plan you land on by default, this one comes out $2,876 more per year (130%). We infer the default from the tariff structure rather than a flag in the data, so confirm it against your own bill before you switch.

If this is new to you

Where this comes from

Effective
2026-03-01

the date this tariff took effect

Covers
delivery + supply

Delivery Charges + Basic Generation Service

Enrollment
open to new customers

Tariff document: https://www.ameren.com/-/media/rates/illinois/residential/electric-rates/distribution-delivery/aiel8rtpbrr08282025.ashx