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Data as of 2026-10-27
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Built 2026-10-28 (28 October 2026)

SWPW Daily Load Shape and Duck Curve by Hour, 29 September to 27 October 2026

In the 29 complete local days from 29 September to 27 October 2026, electricity demand in SWPW averaged 2,678 MW and typically peaked at 19:00 local time (3,017 MW) and bottomed out at 04:00 (2,354 MW). With solar and wind taken off, the remaining load fell to 1,775 MW at 12:00 and then rose 589 MW between 16:00 to 19:00. Hours are local clock time (America/Chicago).

Key Facts

  • Over 29 complete local days from 29 September to 27 October 2026, average demand in SWPW was 2,678 MW. The hour of the day with the highest average demand was 19:00 local time (3,017 MW) and the lowest was 04:00 (2,354 MW).
  • The largest three hour rise in average demand was 201 MW, between 15:00 to 18:00 local time.
  • The single highest hour of demand in the 30 day window was 3,383 MW, in the hour starting 5 Oct 2026, 18:00 CDT (UTC-05:00).
  • Solar output averaged 588 MW at its 13:00 peak, 22% of average demand.
  • Demand minus solar and wind (net load) averaged 2,061 MW, fell to 1,775 MW at 12:00 and rose 589 MW over the three hours from 16:00 to 19:00, 22% of average demand.

Average Day by Local Hour

29 days to 2026-10-27, 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 29 September to 27 October 2026. It was lowest at 04:00 (2,354 MW) and highest at 19:00 (3,017 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 29 September to 27 October 2026. It was lowest at 04:00 (2,354 MW) and highest at 19:00 (3,017 MW). Net generation is the power produced inside the grid, so it differs from demand by net imports.
Mean MW by local hour, 2026-09-29 to 2026-10-27
SWPW average demand and net generation by local hour
Local hour (America/Chicago)DemandNet generation
00:002,551 MW2,518 MW
01:002,461 MW2,383 MW
02:002,401 MW2,310 MW
03:002,367 MW2,279 MW
04:002,354 MW2,286 MW
05:002,376 MW2,310 MW
06:002,455 MW2,389 MW
07:002,595 MW2,501 MW
08:002,672 MW2,567 MW
09:002,668 MW2,599 MW
10:002,654 MW2,569 MW
11:002,656 MW2,556 MW
12:002,669 MW2,562 MW
13:002,695 MW2,599 MW
14:002,737 MW2,631 MW
15:002,789 MW2,655 MW
16:002,848 MW2,736 MW
17:002,923 MW2,830 MW
18:002,990 MW2,866 MW
19:003,017 MW2,892 MW
20:002,994 MW2,897 MW
21:002,909 MW2,820 MW
22:002,814 MW2,705 MW
23:002,684 MW2,587 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 29 September to 27 October 2026. Net load was lowest at 12:00 (1,775 MW) and then rose 589 MW between 16:00 to 19:00. 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 29 September to 27 October 2026. Net load was lowest at 12:00 (1,775 MW) and then rose 589 MW between 16:00 to 19:00.
Mean MW by local hour, 2026-09-29 to 2026-10-27
SWPW duck curve: demand and net load by local hour
Local hour (America/Chicago)DemandNet load (demand minus solar and wind)
00:002,551 MW2,046 MW
01:002,461 MW1,986 MW
02:002,401 MW1,938 MW
03:002,367 MW1,904 MW
04:002,354 MW1,887 MW
05:002,376 MW1,919 MW
06:002,455 MW2,000 MW
07:002,595 MW2,155 MW
08:002,672 MW2,188 MW
09:002,668 MW1,961 MW
10:002,654 MW1,823 MW
11:002,656 MW1,776 MW
12:002,669 MW1,775 MW
13:002,695 MW1,796 MW
14:002,737 MW1,854 MW
15:002,789 MW1,914 MW
16:002,848 MW2,002 MW
17:002,923 MW2,154 MW
18:002,990 MW2,430 MW
19:003,017 MW2,590 MW
20:002,994 MW2,510 MW
21:002,909 MW2,396 MW
22:002,814 MW2,295 MW
23:002,684 MW2,172 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 29 September to 27 October 2026. Solar peaked at 13:00 at 588 MW. 0 150 300 450 600 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 29 September to 27 October 2026. Solar peaked at 13:00 at 588 MW.
Mean MW by local hour, 2026-09-29 to 2026-10-27
SWPW average solar and wind output by local hour
Local hour (America/Chicago)SolarWind
00:000 MW506 MW
01:000 MW475 MW
02:000 MW463 MW
03:000 MW462 MW
04:000 MW466 MW
05:000 MW456 MW
06:000 MW455 MW
07:000 MW440 MW
08:0047 MW438 MW
09:00313 MW394 MW
10:00498 MW334 MW
11:00559 MW322 MW
12:00577 MW318 MW
13:00588 MW311 MW
14:00577 MW306 MW
15:00566 MW309 MW
16:00526 MW320 MW
17:00440 MW330 MW
18:00212 MW348 MW
19:0016 MW411 MW
20:001 MW482 MW
21:001 MW512 MW
22:000 MW519 MW
23:000 MW512 MW
Average SWPW demand, net generation, solar, wind and net load by local hour
Local hourDemandNet generationSolarWindNet load
00:00 2,551 MW 2,518 MW 0 MW 506 MW 2,046 MW
01:00 2,461 MW 2,383 MW 0 MW 475 MW 1,986 MW
02:00 2,401 MW 2,310 MW 0 MW 463 MW 1,938 MW
03:00 2,367 MW 2,279 MW 0 MW 462 MW 1,904 MW
04:00 2,354 MW 2,286 MW 0 MW 466 MW 1,887 MW
05:00 2,376 MW 2,310 MW 0 MW 456 MW 1,919 MW
06:00 2,455 MW 2,389 MW 0 MW 455 MW 2,000 MW
07:00 2,595 MW 2,501 MW 0 MW 440 MW 2,155 MW
08:00 2,672 MW 2,567 MW 47 MW 438 MW 2,188 MW
09:00 2,668 MW 2,599 MW 313 MW 394 MW 1,961 MW
10:00 2,654 MW 2,569 MW 498 MW 334 MW 1,823 MW
11:00 2,656 MW 2,556 MW 559 MW 322 MW 1,776 MW
12:00 2,669 MW 2,562 MW 577 MW 318 MW 1,775 MW
13:00 2,695 MW 2,599 MW 588 MW 311 MW 1,796 MW
14:00 2,737 MW 2,631 MW 577 MW 306 MW 1,854 MW
15:00 2,789 MW 2,655 MW 566 MW 309 MW 1,914 MW
16:00 2,848 MW 2,736 MW 526 MW 320 MW 2,002 MW
17:00 2,923 MW 2,830 MW 440 MW 330 MW 2,154 MW
18:00 2,990 MW 2,866 MW 212 MW 348 MW 2,430 MW
19:00 3,017 MW 2,892 MW 16 MW 411 MW 2,590 MW
20:00 2,994 MW 2,897 MW 1 MW 482 MW 2,510 MW
21:00 2,909 MW 2,820 MW 1 MW 512 MW 2,396 MW
22:00 2,814 MW 2,705 MW 0 MW 519 MW 2,295 MW
23:00 2,684 MW 2,587 MW 0 MW 512 MW 2,172 MW

Each value is the mean over 29 complete local days from 29 September to 27 October 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 3,383 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 2026-10-27. 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.
Cite this page
APA 7

World Power Monitor. (2026). SWPW Daily Load Shape and Duck Curve by Hour. https://worldpowermonitor.com/load-shapes/spp-west/

Plain text

World Power Monitor. SWPW Daily Load Shape and Duck Curve by Hour. Data as of 2026-10-27. Data from U.S. Energy Information Administration. https://worldpowermonitor.com/load-shapes/spp-west/

BibTeX 
@misc{wpm_load_shapes_spp_west_2026,
  title = {{SWPW Daily Load Shape and Duck Curve by Hour}},
  author = {{World Power Monitor}},
  year = {2026},
  note = {Data as of 2026-10-27. Data from U.S. Energy Information Administration.},
  url = {https://worldpowermonitor.com/load-shapes/spp-west/}
}

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