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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)

SPP 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 SPP averaged 42,380 MW and typically peaked at 16:00 local time (51,059 MW) and bottomed out at 04:00 (34,305 MW). With solar and wind taken off, the remaining load fell to 19,054 MW at 03:00 and then rose 873 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 SPP was 42,380 MW. The hour of the day with the highest average demand was 16:00 local time (51,059 MW) and the lowest was 04:00 (34,305 MW).
  • The largest three hour rise in average demand was 1,267 MW, between 14:00 to 17:00 local time.
  • The single highest hour of demand in the 30 day window was 56,486 MW, in the hour starting 4 Sept 2026, 16:00 CDT (UTC-05:00).
  • Solar output averaged 2,314 MW at its 12:00 peak, 5% of average demand.
  • Demand minus solar and wind (net load) averaged 28,296 MW, fell to 19,054 MW at 03:00 and rose 873 MW over the three hours from 14:00 to 17:00, 2% of average demand.

Average Day by Local Hour

29 days to 2026-09-19, America/Chicago time
SPP average demand and net generation by local hour Average electricity demand in SPP by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (34,305 MW) and highest at 16:00 (51,059 MW). Net generation is the power produced inside the grid, so it differs from demand by net imports. 0 15,000 30,000 45,000 60,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average electricity demand in SPP by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (34,305 MW) and highest at 16:00 (51,059 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
SPP average demand and net generation by local hour
Local hour (America/Chicago)DemandNet generation
00:0038,001 MW39,732 MW
01:0036,505 MW38,120 MW
02:0035,376 MW36,959 MW
03:0034,630 MW36,203 MW
04:0034,305 MW35,812 MW
05:0034,599 MW36,107 MW
06:0035,500 MW36,870 MW
07:0036,159 MW37,448 MW
08:0037,454 MW38,132 MW
09:0039,469 MW39,807 MW
10:0041,859 MW42,093 MW
11:0044,283 MW44,515 MW
12:0046,516 MW46,679 MW
13:0048,381 MW48,413 MW
14:0049,669 MW49,663 MW
15:0050,601 MW50,580 MW
16:0051,059 MW51,248 MW
17:0050,937 MW51,790 MW
18:0050,016 MW51,637 MW
19:0048,303 MW50,205 MW
20:0046,643 MW48,578 MW
21:0044,598 MW46,469 MW
22:0042,230 MW43,998 MW
23:0040,032 MW41,571 MW
SPP duck curve: demand and net load by local hour Average demand and net load (demand minus solar and wind) in SPP by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 03:00 (19,054 MW) and then rose 873 MW between 14:00 to 17:00. 0 15,000 30,000 45,000 60,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average demand and net load (demand minus solar and wind) in SPP by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 03:00 (19,054 MW) and then rose 873 MW between 14:00 to 17:00.
Mean MW by local hour, 2026-08-22 to 2026-09-19
SPP duck curve: demand and net load by local hour
Local hour (America/Chicago)DemandNet load (demand minus solar and wind)
00:0038,001 MW20,525 MW
01:0036,505 MW19,843 MW
02:0035,376 MW19,225 MW
03:0034,630 MW19,054 MW
04:0034,305 MW19,261 MW
05:0034,599 MW20,021 MW
06:0035,500 MW21,331 MW
07:0036,159 MW22,306 MW
08:0037,454 MW24,464 MW
09:0039,469 MW27,012 MW
10:0041,859 MW29,120 MW
11:0044,283 MW31,492 MW
12:0046,516 MW33,972 MW
13:0048,381 MW36,341 MW
14:0049,669 MW37,739 MW
15:0050,601 MW38,579 MW
16:0051,059 MW38,909 MW
17:0050,937 MW38,613 MW
18:0050,016 MW37,777 MW
19:0048,303 MW36,216 MW
20:0046,643 MW32,570 MW
21:0044,598 MW28,171 MW
22:0042,230 MW24,582 MW
23:0040,032 MW21,978 MW
SPP average solar and wind output by local hour Average solar and wind generation in SPP by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 12:00 at 2,314 MW. 0 5,000 10,000 15,000 20,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average solar and wind generation in SPP by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 12:00 at 2,314 MW.
Mean MW by local hour, 2026-08-22 to 2026-09-19
SPP average solar and wind output by local hour
Local hour (America/Chicago)SolarWind
00:0016 MW17,460 MW
01:0012 MW16,650 MW
02:007 MW16,144 MW
03:003 MW15,573 MW
04:000 MW15,044 MW
05:000 MW14,578 MW
06:001 MW14,169 MW
07:00141 MW13,713 MW
08:001,057 MW11,933 MW
09:001,924 MW10,533 MW
10:002,167 MW10,572 MW
11:002,281 MW10,511 MW
12:002,314 MW10,230 MW
13:002,280 MW9,760 MW
14:002,247 MW9,682 MW
15:002,202 MW9,821 MW
16:002,118 MW10,032 MW
17:001,927 MW10,397 MW
18:001,278 MW10,961 MW
19:00325 MW11,761 MW
20:0079 MW13,994 MW
21:0077 MW16,350 MW
22:0077 MW17,572 MW
23:0079 MW17,975 MW
Average SPP demand, net generation, solar, wind and net load by local hour
Local hourDemandNet generationSolarWindNet load
00:00 38,001 MW 39,732 MW 16 MW 17,460 MW 20,525 MW
01:00 36,505 MW 38,120 MW 12 MW 16,650 MW 19,843 MW
02:00 35,376 MW 36,959 MW 7 MW 16,144 MW 19,225 MW
03:00 34,630 MW 36,203 MW 3 MW 15,573 MW 19,054 MW
04:00 34,305 MW 35,812 MW 0 MW 15,044 MW 19,261 MW
05:00 34,599 MW 36,107 MW 0 MW 14,578 MW 20,021 MW
06:00 35,500 MW 36,870 MW 1 MW 14,169 MW 21,331 MW
07:00 36,159 MW 37,448 MW 141 MW 13,713 MW 22,306 MW
08:00 37,454 MW 38,132 MW 1,057 MW 11,933 MW 24,464 MW
09:00 39,469 MW 39,807 MW 1,924 MW 10,533 MW 27,012 MW
10:00 41,859 MW 42,093 MW 2,167 MW 10,572 MW 29,120 MW
11:00 44,283 MW 44,515 MW 2,281 MW 10,511 MW 31,492 MW
12:00 46,516 MW 46,679 MW 2,314 MW 10,230 MW 33,972 MW
13:00 48,381 MW 48,413 MW 2,280 MW 9,760 MW 36,341 MW
14:00 49,669 MW 49,663 MW 2,247 MW 9,682 MW 37,739 MW
15:00 50,601 MW 50,580 MW 2,202 MW 9,821 MW 38,579 MW
16:00 51,059 MW 51,248 MW 2,118 MW 10,032 MW 38,909 MW
17:00 50,937 MW 51,790 MW 1,927 MW 10,397 MW 38,613 MW
18:00 50,016 MW 51,637 MW 1,278 MW 10,961 MW 37,777 MW
19:00 48,303 MW 50,205 MW 325 MW 11,761 MW 36,216 MW
20:00 46,643 MW 48,578 MW 79 MW 13,994 MW 32,570 MW
21:00 44,598 MW 46,469 MW 77 MW 16,350 MW 28,171 MW
22:00 42,230 MW 43,998 MW 77 MW 17,572 MW 24,582 MW
23:00 40,032 MW 41,571 MW 79 MW 17,975 MW 21,978 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 56,486 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.