HomeWattCost

KU RS vs RTOD-Energy

For a typical Kentucky home using 1,102 kWh a month, RTOD-Energy is cheaper by about $35 a year ($135 against $138 a month). RTOD-Energy is cheaper or about the same at every level of use from 200 to 2,500 kWh a month, with the same daily pattern of use.

Utility KUTariffs checked 2026-11-03Typical use 1,102 kWh/mo, Kentucky

Head to head

ScenarioRSRTOD-EnergyCheaper
Typical home, per month$138$135RTOD-Energy
All-in price per kWh12.5¢12.2¢RTOD-Energy
Home + EV, charged at the cheapest hour$168$155RTOD-Energy
Home + EV, plugged in at 6 pm$168$166RTOD-Energy
Fixed charge$17.75$17.75

Typical home: Kentucky 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 RS, 12 am on RTOD-Energy.

Month by month

Typical-home bill each month on each plan.

PlanJanFebMarAprMayJunJulAugSepOctNovDec
RS$177$165$120$106$111$140$170$166$125$109$111$154
RTOD-Energy$188$176$128$92$102$128$155$153$115$97$118$165

RS: price by hour

July weekday.

Same price all day
10.9¢12a3a6a9a12p3p6p9p12a

RTOD-Energy: price by hour

July weekday.

Off-peakPeak
7.3¢23.4¢7.3¢12a3a6a9a12p3p6p9p12a

RS or RTOD-Energy: common questions

Is RS or RTOD-Energy cheaper?

For a typical Kentucky home using 1,102 kWh a month, RTOD-Energy is cheaper by about $35 a year ($135 against $138 a month). RTOD-Energy is cheaper or about the same 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, RTOD-Energy gives the lower total ($155 against $168 a month).

What is the difference between RS and RTOD-Energy?

RS is flat: the same price at every hour, with a fixed charge of $17.75 a month. RTOD-Energy is time-of-use (summer weekdays: Peak 2 pm–6 pm; lowest price 6 pm–2 pm next day), with a fixed charge of $17.75 a month.

How the two plans work

RS: Residential Service

  • One price per kWh at every hour, all year: 10.9¢.
  • Shifting use to other hours changes nothing on this plan; using less is the only lever.
  • Fixed charge: $17.75 a month.

RTOD-Energy: Residential Time-of-Day Energy

  • Peak 2 pm–6 pm on July weekdays; 4 of 24 hours carry the top price of 23.4¢.
  • The cheapest July weekday hour costs 7.3¢, so moving 1 kWh out of the top hours saves 16.1¢.
  • January weekdays range from 7.3¢ to 23.4¢.
  • Weekends differ: off-peak all day.
  • Fixed charge: $17.75 a month.

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