Residential Service Solar Time-of-Use (R-STOU) Three Phase
When does peak hit on Duke Energy Carolinas, LLC’s Residential Service Solar Time-of-Use? Peak hits 6am–9am in Dec–Feb, 6pm–9pm in Mar–Nov — every day.
- peak21.25¢
- mid13.79¢
- off-peak10.79¢
What does Residential Service Solar Time-of-Use cost a year?
| Household | Uses | A month | Per year | Works out to |
|---|---|---|---|---|
| Apartment One or two people, no central air, no electric heat | 4,866 kWh | $84 | $1,003 | 20.6¢ / kWh |
| Family home Three or four people with central air conditioning | 9,453 kWh | $140 | $1,677 | 17.7¢ / kWh |
| Home with an EV Same house, plus an electric car charging overnight | 13,103 kWh | $175 | $2,098 | 16.0¢ / 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
| Period | Rate | Applies when |
|---|---|---|
| peak | 21.25¢ | 6am–9am, 6pm–9pm, December–February; 6pm–9pm, March–November |
| mid | 13.79¢ | 9pm–6am, 9am–6pm, midnight–midnight, December–February; 6am–6pm, 9pm–midnight, 6am–midnight, March–November |
| off-peak | 10.79¢ | midnight–6am, March–November |
Plus a fixed charge of $23.63 per month.
Should you be on Residential Service Solar Time-of-Use?
This plan bills a demand charge on top of the per-kWh rates: a fee tied to your single highest hour of the month. Two homes using the same total electricity can pay very different amounts if one of them runs the dryer, the oven, and the car charger at the same moment. We do not price demand charges yet, so treat every dollar figure on this page as a floor, not a total.
Before a single kilowatt-hour moves, this plan charges $284 a year in fixed fees. On the apartment above that is 28% of the whole bill; on the house with a car charging in it, 14%. 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.
Expect the bill to move with the calendar. The same family home costs about $184 in July and $117 in February — a $67 spread driven by heating and cooling far more than by anything you chose. Budget against the July figure, not the average, and a summer bill stops being a surprise.
Other Duke Energy Carolinas plans
- ES (Residential Service Energy Star, All-Electric)flat
- ES (Residential Service Energy Star, Standard)flat
- RE (Residential Electric Water Heating and Space Conditioning)flat
- Residential - RS (SC)flat
- Residential Electric Water Heating and Space Conditioning - REflat
- Residential Service - Single Phaseflat
- Residential Service - Three Phaseflat
- Residential Service (RES-55) Single Phaseflat
- Residential Service (RES-55) Three Phaseflat
- Residential Service Energy Star All-Electric ESflat
- Residential Service Energy Star Standard ESflat
- Residential Service Solar Time-of-Use (R-STOU) Single Phasedemand
Who can be on Duke Energy Carolinas’s Residential Service Solar Time-of-Use (R-STOU) Three Phase?
Eligibility is not our judgement — it is written into the tariff Duke Energy Carolinas filed. This is what that document says:
This Schedule is available on a voluntary basis to individually-metered residential Customers served under Rider RSC when electric service is used for domestic purposes in and about a residential dwelling unit, including electric vehicle charging, and electric service used on a farm and in the preparation of the farm products for market.
Shortened — the clause runs longer in the filing. Quoted from the filed tariff. Your utility decides eligibility, not us; check with them before you switch.
If this is new to you
- How to read your electric bill
Four kinds of charge, only two of which you can do anything about.
- What is a demand charge on a residential electric bill?
Billed for your worst hour, not your total. Rare on homes, and growing.
- What is critical peak pricing? Peak-day events on your electric bill, explained
A dozen brutally expensive afternoons a year, in exchange for a discount on the other 353 days.
- Why is my electric bill so high in summer?
Usually three causes at once, and only one of them is your air conditioner.
Where this comes from
- Effective
- 2026-02-01
the date this tariff took effect
- Covers
- delivery + supply
the ZIP-code service map lists this territory as bundled, so the utility sells delivery and supply together
- Enrollment
- open to new customers
Tariff document: https://www.duke-energy.com/-/media/pdfs/for-your-home/rates/dep-sc/leaf-no-502-schedule-r-stou.pdf?rev=40e19ba952a440709d083654d712ef46