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Tariff data · 2026-08-27
← Duke Energy Carolinas, LLC · NC

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¢
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Every hour of the year at this rate, drawn to scale — 24 hours across, 12 months deep, height is ¢/kWh. The tallest bar is 21.2¢ (Jan, 6am), the shortest is 10.8¢ (Mar, midnight) — 2.0× apart.
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 Residential Service Solar Time-of-Use cost a year?

This plan is for homes that generate their own power — the tariff is named “Solar”. It is a real, currently open tariff, but the figures below are wrong for it: our three modelled households have no panels, so they earn none of the export credits that make this rate worth choosing and pay full price for every kilowatt-hour instead. Read the numbers as an upper bound, not an estimate, and see the tariff document for the export terms. We leave it out of the plan-to-plan comparisons.
HouseholdUsesA monthPer yearWorks out to
Apartment

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

4,866 kWh$84$1,00320.6¢ / kWh
Family home

Three or four people with central air conditioning

9,453 kWh$140$1,67717.7¢ / kWh
Home with an EV

Same house, plus an electric car charging overnight

13,103 kWh$175$2,09816.0¢ / 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

PeriodRateApplies when
peak21.25¢6am–9am, 6pm–9pm, December–February; 6pm–9pm, March–November
mid13.79¢9pm–6am, 9am–6pm, midnight–midnight, December–February; 6am–6pm, 9pm–midnight, 6am–midnight, March–November
off-peak10.79¢midnight–6am, March–November

Plus a fixed charge of $23.63 per month.

This plan also bills a demand charge based on your highest single hour of usage. We don’t price that yet, so treat any total here as incomplete.

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

All 30 Duke Energy Carolinas plans →

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

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