How Duke Energy Carolinas’s plans work
RS (Residential Service). In July the first 1,000 kWh a month cost 15.1¢ each; then 15.8¢ above 1,000 kWh a month. An average South Carolina home (1,499 kWh in July) goes past the first tier, so extra load such as an EV is priced higher. Fixed charge: $12.07 a month.
RSTC (Residential Time of Use with Critical Peak Pricing). Mid-peak 12 am–1 am, Mid-peak 6 am–6 pm, Peak 6 pm–9 pm, Mid-peak 9 pm–12 am on July weekdays; 3 of 24 hours carry the top price of 27.8¢. The cheapest July weekday hour costs 10.1¢, so moving 1 kWh out of the top hours saves 17.7¢. January weekdays range from 10.1¢ to 27.8¢. Summer pricing applies May–Sep; winter pricing Oct–Apr. Weekends differ: Mid-peak 12 am–1 am, Mid-peak 6 am–12 am. Fixed charge: $13.20 a month.
RT-EV (Residential Time of Use with Discount Charging Period). Peak 5 am–11 pm on July weekdays; 18 of 24 hours carry the top price of 16.3¢. The cheapest July weekday hour costs 11.4¢, so moving 1 kWh out of the top hours saves 4.9¢. January weekdays range from 11.4¢ to 16.3¢. Fixed charge: $13.20 a month.
Prices on this page are all-in per kWh, before taxes: base rates, supply and every per-kWh rider in the utility’s current tariff sheets. Your bill shows them as separate lines, and riders can change between tariff revisions.
As a cross-check, Duke Energy Carolinas billed its residential customers an average of 13.47¢ per kWh in 2025 (revenue ÷ sales, EIA-861). A plan taken from URDB is shown only if its all-in price is consistent with that figure, adjusted for South Carolina’s price change since.