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Data as of 2026-09-19
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Built 2026-09-21 (21 September 2026)

SC Daily Load Shape and Duck Curve by Hour, 22 August to 19 September 2026

In the 29 complete local days from 22 August to 19 September 2026, electricity demand in SC averaged 3,654 MW and typically peaked at 17:00 local time (4,437 MW) and bottomed out at 04:00 (2,899 MW). With solar taken off, the remaining load fell to 2,899 MW at 04:00 and then rose 258 MW between 15:00 to 18:00. Hours are local clock time (America/New_York).

Key Facts

  • Over 29 complete local days from 22 August to 19 September 2026, average demand in SC was 3,654 MW. The hour of the day with the highest average demand was 17:00 local time (4,437 MW) and the lowest was 04:00 (2,899 MW).
  • The largest three hour rise in average demand was 40 MW, between 15:00 to 18:00 local time.
  • The single highest hour of demand in the 30 day window was 5,029 MW, in the hour starting 5 Sept 2026, 16:00 EDT (UTC-04:00).
  • Solar output averaged 361 MW at its 12:00 peak, 10% of average demand.
  • Demand minus solar (net load) averaged 3,519 MW, fell to 2,899 MW at 04:00 and rose 258 MW over the three hours from 15:00 to 18:00, 7% of average demand.

Average Day by Local Hour

29 days to 2026-09-19, America/New_York time
SC average demand and net generation by local hour Average electricity demand in SC by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (2,899 MW) and highest at 17:00 (4,437 MW). Net generation is the power produced inside the grid, so it differs from demand by net imports. 0 1,250 2,500 3,750 5,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average electricity demand in SC by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (2,899 MW) and highest at 17:00 (4,437 MW). Net generation is the power produced inside the grid, so it differs from demand by net imports.
Mean MW by local hour, 2026-08-22 to 2026-09-19
SC average demand and net generation by local hour
Local hour (America/New_York)DemandNet generation
00:003,204 MW2,149 MW
01:003,068 MW1,960 MW
02:002,957 MW1,850 MW
03:002,917 MW1,803 MW
04:002,899 MW1,790 MW
05:002,925 MW1,820 MW
06:003,001 MW1,914 MW
07:003,036 MW1,958 MW
08:003,185 MW2,096 MW
09:003,430 MW2,349 MW
10:003,667 MW2,599 MW
11:003,929 MW2,883 MW
12:004,163 MW3,130 MW
13:004,332 MW3,261 MW
14:004,437 MW3,290 MW
15:004,343 MW3,202 MW
16:004,334 MW3,292 MW
17:004,437 MW3,254 MW
18:004,383 MW3,161 MW
19:004,219 MW3,018 MW
20:004,074 MW2,920 MW
21:003,862 MW2,801 MW
22:003,552 MW2,585 MW
23:003,334 MW2,336 MW
SC duck curve: demand and net load by local hour Average demand and net load (demand minus solar) in SC by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 04:00 (2,899 MW) and then rose 258 MW between 15:00 to 18:00. 0 1,250 2,500 3,750 5,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average demand and net load (demand minus solar) in SC by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 04:00 (2,899 MW) and then rose 258 MW between 15:00 to 18:00.
Mean MW by local hour, 2026-08-22 to 2026-09-19
SC duck curve: demand and net load by local hour
Local hour (America/New_York)DemandNet load (demand minus solar)
00:003,204 MW3,204 MW
01:003,068 MW3,068 MW
02:002,957 MW2,957 MW
03:002,917 MW2,917 MW
04:002,899 MW2,899 MW
05:002,925 MW2,925 MW
06:003,001 MW3,001 MW
07:003,036 MW3,006 MW
08:003,185 MW3,007 MW
09:003,430 MW3,133 MW
10:003,667 MW3,325 MW
11:003,929 MW3,572 MW
12:004,163 MW3,802 MW
13:004,332 MW3,986 MW
14:004,437 MW4,095 MW
15:004,343 MW4,020 MW
16:004,334 MW4,035 MW
17:004,437 MW4,194 MW
18:004,383 MW4,277 MW
19:004,219 MW4,209 MW
20:004,074 MW4,074 MW
21:003,862 MW3,862 MW
22:003,552 MW3,552 MW
23:003,334 MW3,334 MW
SC average solar output by local hour Average solar generation in SC by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 12:00 at 361 MW. 0 100 200 300 400 00:0003:0006:0009:0012:0015:0018:0021:00
Average solar generation in SC by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 12:00 at 361 MW.
Mean MW by local hour, 2026-08-22 to 2026-09-19
SC average solar output by local hour
Local hour (America/New_York)Solar
00:000 MW
01:000 MW
02:000 MW
03:000 MW
04:000 MW
05:000 MW
06:000 MW
07:0030 MW
08:00178 MW
09:00297 MW
10:00342 MW
11:00358 MW
12:00361 MW
13:00346 MW
14:00342 MW
15:00323 MW
16:00298 MW
17:00243 MW
18:00105 MW
19:0010 MW
20:000 MW
21:000 MW
22:000 MW
23:000 MW
Average SC demand, net generation, solar and net load by local hour
Local hourDemandNet generationSolarNet load
00:00 3,204 MW 2,149 MW 0 MW 3,204 MW
01:00 3,068 MW 1,960 MW 0 MW 3,068 MW
02:00 2,957 MW 1,850 MW 0 MW 2,957 MW
03:00 2,917 MW 1,803 MW 0 MW 2,917 MW
04:00 2,899 MW 1,790 MW 0 MW 2,899 MW
05:00 2,925 MW 1,820 MW 0 MW 2,925 MW
06:00 3,001 MW 1,914 MW 0 MW 3,001 MW
07:00 3,036 MW 1,958 MW 30 MW 3,006 MW
08:00 3,185 MW 2,096 MW 178 MW 3,007 MW
09:00 3,430 MW 2,349 MW 297 MW 3,133 MW
10:00 3,667 MW 2,599 MW 342 MW 3,325 MW
11:00 3,929 MW 2,883 MW 358 MW 3,572 MW
12:00 4,163 MW 3,130 MW 361 MW 3,802 MW
13:00 4,332 MW 3,261 MW 346 MW 3,986 MW
14:00 4,437 MW 3,290 MW 342 MW 4,095 MW
15:00 4,343 MW 3,202 MW 323 MW 4,020 MW
16:00 4,334 MW 3,292 MW 298 MW 4,035 MW
17:00 4,437 MW 3,254 MW 243 MW 4,194 MW
18:00 4,383 MW 3,161 MW 105 MW 4,277 MW
19:00 4,219 MW 3,018 MW 10 MW 4,209 MW
20:00 4,074 MW 2,920 MW 0 MW 4,074 MW
21:00 3,862 MW 2,801 MW 0 MW 3,862 MW
22:00 3,552 MW 2,585 MW 0 MW 3,552 MW
23:00 3,334 MW 2,336 MW 0 MW 3,334 MW

Each value is the mean over 29 complete local days from 22 August to 19 September 2026, weekdays and weekends together, for the hour starting at that local clock time. Net load is demand minus solar generation. The single highest hour of demand in the whole 30 day window was 5,029 MW; it is a published reading, not an average, and is not part of the profile above.

Source: U.S. Energy Information Administration (EIA). (US Government work, public domain) Data as of 2026-09-19. Profiles are computed by World Power Monitor from the operator's hourly series.

Assumptions

  • Hours are local clock time in America/New_York. A local day is used only if it is whole inside the 30 day window and at least 22 of its hours are complete; the profile uses the 29 most recent such days. Daylight saving follows the local clock: on a clock change day the missing hour is absent and the repeated hour is averaged over both readings.
  • The average mixes weekdays and weekends and covers only 29 days, so it describes recent conditions, not a seasonal norm.
  • The evening ramp is the largest rise over three hours in the average profile, starting between 14:00 and 20:00 local time.