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

SRP 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 SRP averaged 5,430 MW and typically peaked at 16:00 local time (6,845 MW) and bottomed out at 04:00 (3,997 MW). With solar and wind taken off, the remaining load fell to 3,935 MW at 04:00 and then rose 363 MW between 14:00 to 17:00. Hours are local clock time (America/Phoenix).

Key Facts

  • Over 29 complete local days from 22 August to 19 September 2026, average demand in SRP was 5,430 MW. The hour of the day with the highest average demand was 16:00 local time (6,845 MW) and the lowest was 04:00 (3,997 MW).
  • The largest three hour rise in average demand was 39 MW, between 14:00 to 17:00 local time.
  • The single highest hour of demand in the 30 day window was 8,378 MW, in the hour starting 22 Aug 2026, 15:00 MST (UTC-07:00).
  • Solar output averaged 1,115 MW at its 14:00 peak, 21% of average demand.
  • Demand minus solar and wind (net load) averaged 4,855 MW, fell to 3,935 MW at 04:00 and rose 363 MW over the three hours from 14:00 to 17:00, 7% of average demand.

Average Day by Local Hour

29 days to 2026-09-19, America/Phoenix time
SRP average demand and net generation by local hour Average electricity demand in SRP by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (3,997 MW) and highest at 16:00 (6,845 MW). Net generation is the power produced inside the grid, so it differs from demand by net imports. 0 3,000 6,000 9,000 12,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average electricity demand in SRP by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 04:00 (3,997 MW) and highest at 16:00 (6,845 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
SRP average demand and net generation by local hour
Local hour (America/Phoenix)DemandNet generation
00:004,777 MW8,740 MW
01:004,436 MW8,488 MW
02:004,239 MW8,309 MW
03:004,059 MW8,192 MW
04:003,997 MW8,177 MW
05:004,037 MW8,292 MW
06:004,110 MW8,353 MW
07:004,398 MW8,135 MW
08:004,716 MW7,846 MW
09:005,083 MW8,103 MW
10:005,483 MW8,443 MW
11:005,859 MW8,838 MW
12:006,247 MW9,185 MW
13:006,549 MW9,441 MW
14:006,726 MW9,677 MW
15:006,770 MW9,781 MW
16:006,845 MW9,847 MW
17:006,765 MW10,200 MW
18:006,601 MW10,600 MW
19:006,297 MW10,361 MW
20:006,100 MW10,086 MW
21:005,815 MW9,718 MW
22:005,382 MW9,417 MW
23:005,031 MW9,112 MW
SRP duck curve: demand and net load by local hour Average demand and net load (demand minus solar and wind) in SRP by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 04:00 (3,935 MW) and then rose 363 MW between 14:00 to 17:00. 0 2,000 4,000 6,000 8,000 00:0003:0006:0009:0012:0015:0018:0021:00
Average demand and net load (demand minus solar and wind) in SRP by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 04:00 (3,935 MW) and then rose 363 MW between 14:00 to 17:00.
Mean MW by local hour, 2026-08-22 to 2026-09-19
SRP duck curve: demand and net load by local hour
Local hour (America/Phoenix)DemandNet load (demand minus solar and wind)
00:004,777 MW4,679 MW
01:004,436 MW4,358 MW
02:004,239 MW4,171 MW
03:004,059 MW3,998 MW
04:003,997 MW3,935 MW
05:004,037 MW3,981 MW
06:004,110 MW4,017 MW
07:004,398 MW3,968 MW
08:004,716 MW4,015 MW
09:005,083 MW4,199 MW
10:005,483 MW4,507 MW
11:005,859 MW4,760 MW
12:006,247 MW5,098 MW
13:006,549 MW5,359 MW
14:006,726 MW5,522 MW
15:006,770 MW5,583 MW
16:006,845 MW5,738 MW
17:006,765 MW5,884 MW
18:006,601 MW5,876 MW
19:006,297 MW5,715 MW
20:006,100 MW5,626 MW
21:005,815 MW5,479 MW
22:005,382 MW5,167 MW
23:005,031 MW4,890 MW
SRP average solar and wind output by local hour Average solar and wind generation in SRP by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 14:00 at 1,115 MW. 0 300 600 900 1,200 00:0003:0006:0009:0012:0015:0018:0021:00
Average solar and wind generation in SRP by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 14:00 at 1,115 MW.
Mean MW by local hour, 2026-08-22 to 2026-09-19
SRP average solar and wind output by local hour
Local hour (America/Phoenix)SolarWind
00:0025 MW74 MW
01:009 MW69 MW
02:002 MW66 MW
03:000 MW62 MW
04:000 MW62 MW
05:000 MW57 MW
06:0044 MW49 MW
07:00391 MW39 MW
08:00665 MW36 MW
09:00837 MW48 MW
10:00922 MW54 MW
11:001,037 MW62 MW
12:001,075 MW74 MW
13:001,105 MW85 MW
14:001,115 MW90 MW
15:001,096 MW90 MW
16:001,015 MW92 MW
17:00800 MW81 MW
18:00646 MW79 MW
19:00506 MW77 MW
20:00407 MW67 MW
21:00262 MW73 MW
22:00143 MW72 MW
23:0070 MW71 MW
Average SRP demand, net generation, solar, wind and net load by local hour
Local hourDemandNet generationSolarWindNet load
00:00 4,777 MW 8,740 MW 25 MW 74 MW 4,679 MW
01:00 4,436 MW 8,488 MW 9 MW 69 MW 4,358 MW
02:00 4,239 MW 8,309 MW 2 MW 66 MW 4,171 MW
03:00 4,059 MW 8,192 MW 0 MW 62 MW 3,998 MW
04:00 3,997 MW 8,177 MW 0 MW 62 MW 3,935 MW
05:00 4,037 MW 8,292 MW 0 MW 57 MW 3,981 MW
06:00 4,110 MW 8,353 MW 44 MW 49 MW 4,017 MW
07:00 4,398 MW 8,135 MW 391 MW 39 MW 3,968 MW
08:00 4,716 MW 7,846 MW 665 MW 36 MW 4,015 MW
09:00 5,083 MW 8,103 MW 837 MW 48 MW 4,199 MW
10:00 5,483 MW 8,443 MW 922 MW 54 MW 4,507 MW
11:00 5,859 MW 8,838 MW 1,037 MW 62 MW 4,760 MW
12:00 6,247 MW 9,185 MW 1,075 MW 74 MW 5,098 MW
13:00 6,549 MW 9,441 MW 1,105 MW 85 MW 5,359 MW
14:00 6,726 MW 9,677 MW 1,115 MW 90 MW 5,522 MW
15:00 6,770 MW 9,781 MW 1,096 MW 90 MW 5,583 MW
16:00 6,845 MW 9,847 MW 1,015 MW 92 MW 5,738 MW
17:00 6,765 MW 10,200 MW 800 MW 81 MW 5,884 MW
18:00 6,601 MW 10,600 MW 646 MW 79 MW 5,876 MW
19:00 6,297 MW 10,361 MW 506 MW 77 MW 5,715 MW
20:00 6,100 MW 10,086 MW 407 MW 67 MW 5,626 MW
21:00 5,815 MW 9,718 MW 262 MW 73 MW 5,479 MW
22:00 5,382 MW 9,417 MW 143 MW 72 MW 5,167 MW
23:00 5,031 MW 9,112 MW 70 MW 71 MW 4,890 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 8,378 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/Phoenix. 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.