HomeWattCost

Potomac Edison R vs R-TOU

For a typical Maryland home using 945 kWh a month, R-TOU is cheaper by about $253 a year ($144 against $165 a month). R-TOU is cheaper at every level of use from 200 to 2,500 kWh a month, with the same daily pattern of use.

Utility Potomac EdisonTariffs checked 2026-09-28Typical use 945 kWh/mo, Maryland

Head to head

ScenarioRR-TOUCheaper
Typical home, per month$165$144R-TOU
All-in price per kWh17.5¢15.3¢R-TOU
Home + EV, charged at the cheapest hour$212$181R-TOU
Home + EV, plugged in at 6 pm$212$195R-TOU
Fixed charge$6.32$6.32

Typical home: Maryland 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 R, 12 am on R-TOU.

Month by month

Typical-home bill each month on each plan.

PlanJanFebMarAprMayJunJulAugSepOctNovDec
R$225$201$151$124$127$165$211$171$149$116$137$207
R-TOU$192$173$130$108$114$147$186$152$133$102$119$178

R: price by hour

July weekday.

Same price all day
17.2¢12a3a6a9a12p3p6p9p12a

R-TOU: price by hour

July weekday.

Off-peakPeak
13.7¢20.7¢13.7¢12a3a6a9a12p3p6p9p12a

R or R-TOU: common questions

Is R or R-TOU cheaper?

For a typical Maryland home using 945 kWh a month, R-TOU is cheaper by about $253 a year ($144 against $165 a month). R-TOU 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, R-TOU gives the lower total ($181 against $212 a month).

What is the difference between R and R-TOU?

R is flat: the same price at every hour, with a fixed charge of $6.32 a month. R-TOU is time-of-use (summer weekdays: Peak 4 pm–9 pm; lowest price 9 pm–4 pm next day), with a fixed charge of $6.32 a month.

How the two plans work

R: Residential Service

  • One price per kWh at every hour: 17.2¢ in July and 16.6¢ in January.
  • Shifting use to other hours changes nothing on this plan; using less is the only lever.
  • Fixed charge: $6.32 a month.

R-TOU: Residential Time of Use Service

  • Peak 4 pm–9 pm on July weekdays; 5 of 24 hours carry the top price of 20.7¢.
  • The cheapest July weekday hour costs 13.7¢, so moving 1 kWh out of the top hours saves 7.0¢.
  • January weekdays range from 13.1¢ to 20.1¢.
  • Weekends differ: off-peak all day.
  • Fixed charge: $6.32 a month.

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