HomeWattCost

UI Rate R vs Rate RT

For a typical Connecticut home using 699 kWh a month, Rate RT is cheaper by about $144 a year ($187 against $199 a month). Rate RT is cheaper at every level of use from 200 to 2,500 kWh a month, with the same daily pattern of use.

Utility UITariffs checked 2026-09-28Typical use 699 kWh/mo, Connecticut

Head to head

ScenarioRate RRate RTCheaper
Typical home, per month$199$187Rate RT
All-in price per kWh28.4¢26.7¢Rate RT
Home + EV, charged at the cheapest hour$272$246Rate RT
Home + EV, plugged in at 6 pm$272$269Rate RT
Fixed charge$13.02$13.02

Typical home: Connecticut 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 any hour on Rate R, 12 am on Rate RT.

Month by month

Typical-home bill each month on each plan.

PlanJanFebMarAprMayJunJulAugSepOctNovDec
Rate R$243$223$189$155$155$203$257$224$164$152$177$242
Rate RT$226$208$176$144$147$193$244$213$156$143$166$225

Rate R: price by hour

July weekday.

Same price all day
26.5¢12a3a6a9a12p3p6p9p12a

Rate RT: price by hour

July weekday.

Off-peakPeak
21.5¢33.4¢21.5¢12a3a6a9a12p3p6p9p12a

Rate R or Rate RT: common questions

Is Rate R or Rate RT cheaper?

For a typical Connecticut home using 699 kWh a month, Rate RT is cheaper by about $144 a year ($187 against $199 a month). Rate RT is cheaper at every level of use from 200 to 2,500 kWh a month, with the same daily pattern of use. Adding an EV driven 1,000 miles a month and charged at each plan’s cheapest hour, Rate RT gives the lower total ($246 against $272 a month).

What is the difference between Rate R and Rate RT?

Rate R is flat: the same price at every hour, with a fixed charge of $13.02 a month. Rate RT is time-of-use (summer weekdays: Peak noon–8 pm; lowest price 8 pm–noon next day), with a fixed charge of $13.02 a month.

How the two plans work

Rate R: Residential Rate R (Standard Service supply)

  • One price per kWh at every hour, all year: 26.5¢.
  • Shifting use to other hours changes nothing on this plan; using less is the only lever.
  • Fixed charge: $13.02 a month.

Rate RT: Residential Time-of-Use Rate RT (Standard Service supply)

  • Peak noon–8 pm on July weekdays; 8 of 24 hours carry the top price of 33.4¢.
  • The cheapest July weekday hour costs 21.5¢, so moving 1 kWh out of the top hours saves 11.9¢.
  • January weekdays range from 21.5¢ to 33.4¢.
  • Weekends differ: off-peak all day.
  • Fixed charge: $13.02 a month.

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