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

IID 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 IID averaged 644 MW and typically peaked at 16:00 local time (883 MW) and bottomed out at 04:00 (448 MW). With solar taken off, the remaining load fell to 121 MW at 09:00 and then rose 378 MW between 15:00 to 18:00. Hours are local clock time (America/Los_Angeles).

Key Facts

  • Over 29 complete local days from 22 August to 19 September 2026, average demand in IID was 644 MW. The hour of the day with the highest average demand was 16:00 local time (883 MW) and the lowest was 04:00 (448 MW).
  • The largest three hour rise in average demand was 29 MW, between 14:00 to 17:00 local time.
  • The single highest hour of demand in the 30 day window was 1,099 MW, in the hour starting 26 Aug 2026, 16:00 PDT (UTC-07:00).
  • Solar output averaged 517 MW at its 13:00 peak, 80% of average demand.
  • Demand minus solar (net load) averaged 443 MW, fell to 121 MW at 09:00 and rose 378 MW over the three hours from 15:00 to 18:00, 59% of average demand.

Average Day by Local Hour

29 days to 2026-09-19, America/Los_Angeles time
IID average demand and net generation by local hour Average electricity demand in IID by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (448 MW) and highest at 16:00 (883 MW). Net generation is the power produced inside the grid, so it differs from demand by net imports. 0 300 600 900 1,200 00:0003:0006:0009:0012:0015:0018:0021:00
Average electricity demand in IID by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (448 MW) and highest at 16:00 (883 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
IID average demand and net generation by local hour
Local hour (America/Los_Angeles)DemandNet generation
00:00532 MW580 MW
01:00497 MW559 MW
02:00472 MW568 MW
03:00454 MW562 MW
04:00448 MW557 MW
05:00453 MW575 MW
06:00463 MW589 MW
07:00482 MW699 MW
08:00529 MW871 MW
09:00581 MW945 MW
10:00635 MW982 MW
11:00688 MW1,008 MW
12:00747 MW1,042 MW
13:00801 MW1,062 MW
14:00843 MW1,076 MW
15:00874 MW1,047 MW
16:00883 MW972 MW
17:00872 MW836 MW
18:00833 MW677 MW
19:00787 MW631 MW
20:00733 MW633 MW
21:00680 MW632 MW
22:00621 MW624 MW
23:00556 MW617 MW
IID duck curve: demand and net load by local hour Average demand and net load (demand minus solar) in IID by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 09:00 (121 MW) and then rose 378 MW between 15:00 to 18:00. 0 250 500 750 1,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average demand and net load (demand minus solar) in IID by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 09:00 (121 MW) and then rose 378 MW between 15:00 to 18:00.
Mean MW by local hour, 2026-08-22 to 2026-09-19
IID duck curve: demand and net load by local hour
Local hour (America/Los_Angeles)DemandNet load (demand minus solar)
00:00532 MW528 MW
01:00497 MW496 MW
02:00472 MW470 MW
03:00454 MW453 MW
04:00448 MW447 MW
05:00453 MW451 MW
06:00463 MW443 MW
07:00482 MW299 MW
08:00529 MW149 MW
09:00581 MW121 MW
10:00635 MW150 MW
11:00688 MW190 MW
12:00747 MW237 MW
13:00801 MW284 MW
14:00843 MW329 MW
15:00874 MW398 MW
16:00883 MW476 MW
17:00872 MW628 MW
18:00833 MW776 MW
19:00787 MW770 MW
20:00733 MW712 MW
21:00680 MW662 MW
22:00621 MW613 MW
23:00556 MW546 MW
IID average solar output by local hour Average solar generation in IID by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 13:00 at 517 MW. 0 150 300 450 600 00:0003:0006:0009:0012:0015:0018:0021:00
Average solar generation in IID by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 13:00 at 517 MW.
Mean MW by local hour, 2026-08-22 to 2026-09-19
IID average solar output by local hour
Local hour (America/Los_Angeles)Solar
00:004 MW
01:001 MW
02:002 MW
03:001 MW
04:000 MW
05:002 MW
06:0019 MW
07:00183 MW
08:00379 MW
09:00460 MW
10:00485 MW
11:00498 MW
12:00511 MW
13:00517 MW
14:00514 MW
15:00476 MW
16:00406 MW
17:00244 MW
18:0057 MW
19:0017 MW
20:0022 MW
21:0019 MW
22:008 MW
23:0010 MW
Average IID demand, net generation, solar and net load by local hour
Local hourDemandNet generationSolarNet load
00:00 532 MW 580 MW 4 MW 528 MW
01:00 497 MW 559 MW 1 MW 496 MW
02:00 472 MW 568 MW 2 MW 470 MW
03:00 454 MW 562 MW 1 MW 453 MW
04:00 448 MW 557 MW 0 MW 447 MW
05:00 453 MW 575 MW 2 MW 451 MW
06:00 463 MW 589 MW 19 MW 443 MW
07:00 482 MW 699 MW 183 MW 299 MW
08:00 529 MW 871 MW 379 MW 149 MW
09:00 581 MW 945 MW 460 MW 121 MW
10:00 635 MW 982 MW 485 MW 150 MW
11:00 688 MW 1,008 MW 498 MW 190 MW
12:00 747 MW 1,042 MW 511 MW 237 MW
13:00 801 MW 1,062 MW 517 MW 284 MW
14:00 843 MW 1,076 MW 514 MW 329 MW
15:00 874 MW 1,047 MW 476 MW 398 MW
16:00 883 MW 972 MW 406 MW 476 MW
17:00 872 MW 836 MW 244 MW 628 MW
18:00 833 MW 677 MW 57 MW 776 MW
19:00 787 MW 631 MW 17 MW 770 MW
20:00 733 MW 633 MW 22 MW 712 MW
21:00 680 MW 632 MW 19 MW 662 MW
22:00 621 MW 624 MW 8 MW 613 MW
23:00 556 MW 617 MW 10 MW 546 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 1,099 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/Los_Angeles. 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.