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

NYISO Daily Electricity Demand by Hour of Day, 22 August to 19 September 2026

In the 29 complete local days from 22 August to 19 September 2026, electricity demand in NYISO averaged 17,811 MW and typically peaked at 18:00 local time (20,974 MW) and bottomed out at 04:00 (15,057 MW). 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 NYISO was 17,811 MW. The hour of the day with the highest average demand was 18:00 local time (20,974 MW) and the lowest was 04:00 (15,057 MW).
  • The largest three hour rise in average demand was 2,044 MW, between 14:00 to 17:00 local time.
  • The single highest hour of demand in the 30 day window was 24,562 MW, in the hour starting 3 Sept 2026, 18:00 EDT (UTC-04:00).

Average Day by Local Hour

29 days to 2026-09-19, America/New_York time
NYISO average demand and net generation by local hour Average electricity demand in NYISO by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (15,057 MW) and highest at 18:00 (20,974 MW). Net generation is the power produced inside the grid, so it differs from demand by net imports. 0 6,250 12,500 18,750 25,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average electricity demand in NYISO by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (15,057 MW) and highest at 18:00 (20,974 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
NYISO average demand and net generation by local hour
Local hour (America/New_York)DemandNet generation
00:0016,708 MW14,257 MW
01:0015,967 MW13,513 MW
02:0015,439 MW12,988 MW
03:0015,112 MW12,669 MW
04:0015,057 MW12,641 MW
05:0015,447 MW13,045 MW
06:0016,249 MW13,828 MW
07:0016,774 MW14,517 MW
08:0016,899 MW14,586 MW
09:0016,909 MW14,626 MW
10:0017,029 MW14,554 MW
11:0017,313 MW14,902 MW
12:0017,699 MW15,411 MW
13:0018,159 MW15,897 MW
14:0018,641 MW16,329 MW
15:0019,247 MW16,952 MW
16:0019,954 MW17,642 MW
17:0020,686 MW18,078 MW
18:0020,974 MW18,307 MW
19:0020,909 MW18,412 MW
20:0020,466 MW18,037 MW
21:0019,610 MW17,292 MW
22:0018,600 MW16,177 MW
23:0017,621 MW15,116 MW
NYISO average wind output by local hour Average wind generation in NYISO by local clock hour over 29 complete local days from 22 August to 19 September 2026. 0 200 400 600 800 00:0003:0006:0009:0012:0015:0018:0021:00
Average wind generation in NYISO by local clock hour over 29 complete local days from 22 August to 19 September 2026.
Mean MW by local hour, 2026-08-22 to 2026-09-19
NYISO average wind output by local hour
Local hour (America/New_York)Wind
00:00572 MW
01:00543 MW
02:00533 MW
03:00525 MW
04:00523 MW
05:00530 MW
06:00535 MW
07:00553 MW
08:00513 MW
09:00451 MW
10:00404 MW
11:00423 MW
12:00441 MW
13:00466 MW
14:00486 MW
15:00512 MW
16:00515 MW
17:00495 MW
18:00486 MW
19:00540 MW
20:00587 MW
21:00600 MW
22:00603 MW
23:00584 MW
Average NYISO demand, net generation, wind by local hour
Local hourDemandNet generationWind
00:00 16,708 MW 14,257 MW 572 MW
01:00 15,967 MW 13,513 MW 543 MW
02:00 15,439 MW 12,988 MW 533 MW
03:00 15,112 MW 12,669 MW 525 MW
04:00 15,057 MW 12,641 MW 523 MW
05:00 15,447 MW 13,045 MW 530 MW
06:00 16,249 MW 13,828 MW 535 MW
07:00 16,774 MW 14,517 MW 553 MW
08:00 16,899 MW 14,586 MW 513 MW
09:00 16,909 MW 14,626 MW 451 MW
10:00 17,029 MW 14,554 MW 404 MW
11:00 17,313 MW 14,902 MW 423 MW
12:00 17,699 MW 15,411 MW 441 MW
13:00 18,159 MW 15,897 MW 466 MW
14:00 18,641 MW 16,329 MW 486 MW
15:00 19,247 MW 16,952 MW 512 MW
16:00 19,954 MW 17,642 MW 515 MW
17:00 20,686 MW 18,078 MW 495 MW
18:00 20,974 MW 18,307 MW 486 MW
19:00 20,909 MW 18,412 MW 540 MW
20:00 20,466 MW 18,037 MW 587 MW
21:00 19,610 MW 17,292 MW 600 MW
22:00 18,600 MW 16,177 MW 603 MW
23:00 17,621 MW 15,116 MW 584 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. Solar is left out of the net load calculation for NYISO: the series is missing, reads zero, or is under 3% of average demand in this window. The single highest hour of demand in the whole 30 day window was 24,562 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.