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

SWPW 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 SWPW averaged 3,196 MW and typically peaked at 18:00 local time (3,808 MW) and bottomed out at 05:00 (2,636 MW). With solar and wind taken off, the remaining load fell to 2,033 MW at 10:00 and then rose 408 MW between 14:00 to 17:00. Hours are local clock time (America/Chicago).

Key Facts

  • Over 29 complete local days from 22 August to 19 September 2026, average demand in SWPW was 3,196 MW. The hour of the day with the highest average demand was 18:00 local time (3,808 MW) and the lowest was 05:00 (2,636 MW).
  • The largest three hour rise in average demand was 270 MW, between 14:00 to 17:00 local time.
  • The single highest hour of demand in the 30 day window was 4,312 MW, in the hour starting 28 Aug 2026, 16:00 CDT (UTC-05:00).
  • Solar output averaged 714 MW at its 12:00 peak, 22% of average demand.
  • Demand minus solar and wind (net load) averaged 2,526 MW, fell to 2,033 MW at 10:00 and rose 408 MW over the three hours from 14:00 to 17:00, 13% of average demand.

Average Day by Local Hour

29 days to 2026-09-19, America/Chicago time
SWPW average demand and net generation by local hour Average electricity demand in SWPW by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 05:00 (2,636 MW) and highest at 18:00 (3,808 MW). Net generation is the power produced inside the grid, so it differs from demand by net imports. 0 1,000 2,000 3,000 4,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average electricity demand in SWPW by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 05:00 (2,636 MW) and highest at 18:00 (3,808 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
SWPW average demand and net generation by local hour
Local hour (America/Chicago)DemandNet generation
00:003,017 MW2,864 MW
01:002,871 MW2,635 MW
02:002,764 MW2,507 MW
03:002,688 MW2,448 MW
04:002,642 MW2,425 MW
05:002,636 MW2,422 MW
06:002,691 MW2,454 MW
07:002,787 MW2,536 MW
08:002,847 MW2,600 MW
09:002,906 MW2,727 MW
10:003,000 MW2,828 MW
11:003,107 MW2,928 MW
12:003,244 MW3,045 MW
13:003,389 MW3,156 MW
14:003,533 MW3,249 MW
15:003,651 MW3,340 MW
16:003,744 MW3,450 MW
17:003,803 MW3,506 MW
18:003,808 MW3,520 MW
19:003,756 MW3,425 MW
20:003,655 MW3,344 MW
21:003,550 MW3,298 MW
22:003,401 MW3,159 MW
23:003,216 MW3,015 MW
SWPW duck curve: demand and net load by local hour Average demand and net load (demand minus solar and wind) in SWPW by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 10:00 (2,033 MW) and then rose 408 MW between 14:00 to 17:00. 0 1,000 2,000 3,000 4,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average demand and net load (demand minus solar and wind) in SWPW by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 10:00 (2,033 MW) and then rose 408 MW between 14:00 to 17:00.
Mean MW by local hour, 2026-08-22 to 2026-09-19
SWPW duck curve: demand and net load by local hour
Local hour (America/Chicago)DemandNet load (demand minus solar and wind)
00:003,017 MW2,490 MW
01:002,871 MW2,373 MW
02:002,764 MW2,276 MW
03:002,688 MW2,211 MW
04:002,642 MW2,168 MW
05:002,636 MW2,178 MW
06:002,691 MW2,245 MW
07:002,787 MW2,359 MW
08:002,847 MW2,263 MW
09:002,906 MW2,057 MW
10:003,000 MW2,033 MW
11:003,107 MW2,088 MW
12:003,244 MW2,218 MW
13:003,389 MW2,389 MW
14:003,533 MW2,573 MW
15:003,651 MW2,727 MW
16:003,744 MW2,864 MW
17:003,803 MW2,981 MW
18:003,808 MW3,071 MW
19:003,756 MW3,215 MW
20:003,655 MW3,206 MW
21:003,550 MW3,065 MW
22:003,401 MW2,881 MW
23:003,216 MW2,688 MW
SWPW average solar and wind output by local hour Average solar and wind generation in SWPW by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 12:00 at 714 MW. 0 200 400 600 800 00:0003:0006:0009:0012:0015:0018:0021:00
Average solar and wind generation in SWPW by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 12:00 at 714 MW.
Mean MW by local hour, 2026-08-22 to 2026-09-19
SWPW average solar and wind output by local hour
Local hour (America/Chicago)SolarWind
00:007 MW520 MW
01:007 MW491 MW
02:007 MW481 MW
03:007 MW470 MW
04:007 MW467 MW
05:007 MW451 MW
06:007 MW439 MW
07:0012 MW416 MW
08:00192 MW391 MW
09:00508 MW342 MW
10:00625 MW341 MW
11:00692 MW328 MW
12:00714 MW312 MW
13:00713 MW287 MW
14:00677 MW283 MW
15:00636 MW288 MW
16:00589 MW290 MW
17:00513 MW309 MW
18:00406 MW331 MW
19:00170 MW371 MW
20:0019 MW430 MW
21:008 MW477 MW
22:007 MW513 MW
23:008 MW521 MW
Average SWPW demand, net generation, solar, wind and net load by local hour
Local hourDemandNet generationSolarWindNet load
00:00 3,017 MW 2,864 MW 7 MW 520 MW 2,490 MW
01:00 2,871 MW 2,635 MW 7 MW 491 MW 2,373 MW
02:00 2,764 MW 2,507 MW 7 MW 481 MW 2,276 MW
03:00 2,688 MW 2,448 MW 7 MW 470 MW 2,211 MW
04:00 2,642 MW 2,425 MW 7 MW 467 MW 2,168 MW
05:00 2,636 MW 2,422 MW 7 MW 451 MW 2,178 MW
06:00 2,691 MW 2,454 MW 7 MW 439 MW 2,245 MW
07:00 2,787 MW 2,536 MW 12 MW 416 MW 2,359 MW
08:00 2,847 MW 2,600 MW 192 MW 391 MW 2,263 MW
09:00 2,906 MW 2,727 MW 508 MW 342 MW 2,057 MW
10:00 3,000 MW 2,828 MW 625 MW 341 MW 2,033 MW
11:00 3,107 MW 2,928 MW 692 MW 328 MW 2,088 MW
12:00 3,244 MW 3,045 MW 714 MW 312 MW 2,218 MW
13:00 3,389 MW 3,156 MW 713 MW 287 MW 2,389 MW
14:00 3,533 MW 3,249 MW 677 MW 283 MW 2,573 MW
15:00 3,651 MW 3,340 MW 636 MW 288 MW 2,727 MW
16:00 3,744 MW 3,450 MW 589 MW 290 MW 2,864 MW
17:00 3,803 MW 3,506 MW 513 MW 309 MW 2,981 MW
18:00 3,808 MW 3,520 MW 406 MW 331 MW 3,071 MW
19:00 3,756 MW 3,425 MW 170 MW 371 MW 3,215 MW
20:00 3,655 MW 3,344 MW 19 MW 430 MW 3,206 MW
21:00 3,550 MW 3,298 MW 8 MW 477 MW 3,065 MW
22:00 3,401 MW 3,159 MW 7 MW 513 MW 2,881 MW
23:00 3,216 MW 3,015 MW 8 MW 521 MW 2,688 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 and wind generation. The single highest hour of demand in the whole 30 day window was 4,312 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/Chicago. 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.