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

WALC 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 WALC averaged 1,020 MW and typically peaked at 18:00 local time (1,302 MW) and bottomed out at 05:00 (830 MW). With solar and wind taken off, the remaining load fell to 653 MW at 08:00 and then rose 239 MW between 16:00 to 19:00. Hours are local clock time (America/Phoenix).

Key Facts

  • Over 29 complete local days from 22 August to 19 September 2026, average demand in WALC was 1,020 MW. The hour of the day with the highest average demand was 18:00 local time (1,302 MW) and the lowest was 05:00 (830 MW).
  • The largest three hour rise in average demand was 119 MW, between 16:00 to 19:00 local time.
  • The single highest hour of demand in the 30 day window was 1,620 MW, in the hour starting 17 Sept 2026, 19:00 MST (UTC-07:00).
  • Solar output averaged 193 MW at its 14:00 peak, 19% of average demand.
  • Demand minus solar and wind (net load) averaged 796 MW, fell to 653 MW at 08:00 and rose 239 MW over the three hours from 16:00 to 19:00, 23% of average demand.

Average Day by Local Hour

29 days to 2026-09-19, America/Phoenix time
WALC average demand and net generation by local hour Average electricity demand in WALC by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 05:00 (830 MW) and highest at 18:00 (1,302 MW). Net generation is the power produced inside the grid, so it differs from demand by net imports. 0 625 1,250 1,875 2,500 00:0003:0006:0009:0012:0015:0018:0021:00
Average electricity demand in WALC by local clock hour over 29 complete local days from 22 August to 19 September 2026. It was lowest at 05:00 (830 MW) and highest at 18:00 (1,302 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
WALC average demand and net generation by local hour
Local hour (America/Phoenix)DemandNet generation
00:00878 MW1,325 MW
01:00851 MW1,217 MW
02:00854 MW1,156 MW
03:00854 MW1,121 MW
04:00845 MW1,095 MW
05:00830 MW1,142 MW
06:00852 MW1,228 MW
07:00873 MW1,094 MW
08:00939 MW1,101 MW
09:00986 MW1,139 MW
10:001,033 MW1,149 MW
11:001,075 MW1,200 MW
12:001,076 MW1,253 MW
13:001,135 MW1,325 MW
14:001,205 MW1,410 MW
15:001,223 MW1,454 MW
16:001,113 MW1,541 MW
17:001,194 MW1,753 MW
18:001,302 MW2,072 MW
19:001,232 MW2,043 MW
20:001,109 MW1,880 MW
21:001,060 MW1,797 MW
22:001,020 MW1,625 MW
23:00953 MW1,531 MW
WALC duck curve: demand and net load by local hour Average demand and net load (demand minus solar and wind) in WALC by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 08:00 (653 MW) and then rose 239 MW between 16:00 to 19:00. 0 375 750 1,125 1,500 00:0003:0006:0009:0012:0015:0018:0021:00
Average demand and net load (demand minus solar and wind) in WALC by local clock hour over 29 complete local days from 22 August to 19 September 2026. Net load was lowest at 08:00 (653 MW) and then rose 239 MW between 16:00 to 19:00.
Mean MW by local hour, 2026-08-22 to 2026-09-19
WALC duck curve: demand and net load by local hour
Local hour (America/Phoenix)DemandNet load (demand minus solar and wind)
00:00878 MW738 MW
01:00851 MW714 MW
02:00854 MW717 MW
03:00854 MW722 MW
04:00845 MW714 MW
05:00830 MW698 MW
06:00852 MW688 MW
07:00873 MW664 MW
08:00939 MW653 MW
09:00986 MW672 MW
10:001,033 MW719 MW
11:001,075 MW768 MW
12:001,076 MW756 MW
13:001,135 MW799 MW
14:001,205 MW841 MW
15:001,223 MW885 MW
16:001,113 MW798 MW
17:001,194 MW924 MW
18:001,302 MW1,076 MW
19:001,232 MW1,037 MW
20:001,109 MW929 MW
21:001,060 MW885 MW
22:001,020 MW885 MW
23:00953 MW818 MW
WALC average solar and wind output by local hour Average solar and wind generation in WALC by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 14:00 at 193 MW. 0 50 100 150 200 00:0003:0006:0009:0012:0015:0018:0021:00
Average solar and wind generation in WALC by local clock hour over 29 complete local days from 22 August to 19 September 2026. Solar peaked at 14:00 at 193 MW.
Mean MW by local hour, 2026-08-22 to 2026-09-19
WALC average solar and wind output by local hour
Local hour (America/Phoenix)SolarWind
00:005 MW136 MW
01:003 MW134 MW
02:003 MW134 MW
03:001 MW130 MW
04:000 MW130 MW
05:001 MW130 MW
06:0026 MW138 MW
07:0074 MW134 MW
08:00144 MW142 MW
09:00167 MW146 MW
10:00165 MW149 MW
11:00158 MW149 MW
12:00157 MW163 MW
13:00170 MW167 MW
14:00193 MW170 MW
15:00165 MW173 MW
16:00144 MW171 MW
17:0097 MW172 MW
18:0045 MW180 MW
19:0029 MW165 MW
20:0033 MW147 MW
21:0033 MW142 MW
22:003 MW133 MW
23:000 MW135 MW
Average WALC demand, net generation, solar, wind and net load by local hour
Local hourDemandNet generationSolarWindNet load
00:00 878 MW 1,325 MW 5 MW 136 MW 738 MW
01:00 851 MW 1,217 MW 3 MW 134 MW 714 MW
02:00 854 MW 1,156 MW 3 MW 134 MW 717 MW
03:00 854 MW 1,121 MW 1 MW 130 MW 722 MW
04:00 845 MW 1,095 MW 0 MW 130 MW 714 MW
05:00 830 MW 1,142 MW 1 MW 130 MW 698 MW
06:00 852 MW 1,228 MW 26 MW 138 MW 688 MW
07:00 873 MW 1,094 MW 74 MW 134 MW 664 MW
08:00 939 MW 1,101 MW 144 MW 142 MW 653 MW
09:00 986 MW 1,139 MW 167 MW 146 MW 672 MW
10:00 1,033 MW 1,149 MW 165 MW 149 MW 719 MW
11:00 1,075 MW 1,200 MW 158 MW 149 MW 768 MW
12:00 1,076 MW 1,253 MW 157 MW 163 MW 756 MW
13:00 1,135 MW 1,325 MW 170 MW 167 MW 799 MW
14:00 1,205 MW 1,410 MW 193 MW 170 MW 841 MW
15:00 1,223 MW 1,454 MW 165 MW 173 MW 885 MW
16:00 1,113 MW 1,541 MW 144 MW 171 MW 798 MW
17:00 1,194 MW 1,753 MW 97 MW 172 MW 924 MW
18:00 1,302 MW 2,072 MW 45 MW 180 MW 1,076 MW
19:00 1,232 MW 2,043 MW 29 MW 165 MW 1,037 MW
20:00 1,109 MW 1,880 MW 33 MW 147 MW 929 MW
21:00 1,060 MW 1,797 MW 33 MW 142 MW 885 MW
22:00 1,020 MW 1,625 MW 3 MW 133 MW 885 MW
23:00 953 MW 1,531 MW 0 MW 135 MW 818 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 1,620 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.