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Data as of 2026-10-28
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Built 2026-10-28 (28 October 2026)

SC Demand Forecast Accuracy: Error, Bias and Worst Miss, 28 September to 28 October 2026

The day-ahead demand forecast for SC was off by 4.8% on average (mean absolute percentage error) over 719 hours from 28 September to 28 October 2026, and 59% of hours landed within 5% of the reading. Its bias was +4.3%: it ran high on average, an over forecast. The largest miss was 1,530 MW (130.0%) too high at 12 Oct 2026, 01:00 EDT (UTC-04:00). Dates and times are local (America/New_York).

Key Facts

  • The day-ahead demand forecast for SC was off by 4.8% on average (mean absolute percentage error) over 719 hours from 28 September to 28 October 2026, and 59% of hours landed within 5% of the reading. Its bias was +4.3%: it ran high on average, an over forecast. The largest miss was 1,530 MW (130.0%) too high at 12 Oct 2026, 01:00 EDT (UTC-04:00).
  • Across 53 US grids ranked by average error over their own latest 30 day windows, SC came 30 (1 is the smallest error).
  • On average the forecast differed from reported demand by 138 MW, against average demand of 2,999 MW.
  • The forecast was above reported demand in 83% of compared hours.

Forecast Error at a Glance

719 hours from 28 September to 28 October 2026
Average error4.8%
Bias+4.3%
Hours within 5%59%
Worst miss1,530 MW

Average error is the mean absolute percentage gap between the forecast and reported demand. Bias is the signed mean (+120 MW per hour on average): the forecast ran high on average, an over forecast. The worst miss was 1,530 MW (130.0%) too high at 12 Oct 2026, 01:00 EDT (UTC-04:00): forecast 2,707 MW, reported 1,177 MW.

Source: U.S. Energy Information Administration (EIA). (US Government work, public domain) Data as of 2026-10-28. Accuracy is computed by World Power Monitor from the operator's hourly forecast and reported demand.

Forecast and Reported Demand, Last 7 Days

Local time, to 28 Oct 2026, 07:00 EDT (UTC-04:00)
SC day-ahead demand forecast and reported demand by hour Hourly reported demand and the day-ahead forecast for SC over the last 7 days of the window, to 28 Oct 2026, 07:00 EDT (UTC-04:00). Gaps are hours with a missing, zero or implausible report. 0 1,000 2,000 3,000 4,000 21 Oct, 08:0022 Oct, 08:0023 Oct, 08:0024 Oct, 08:0025 Oct, 08:0026 Oct, 08:0027 Oct, 08:00
Hourly reported demand and the day-ahead forecast for SC over the last 7 days of the window, to 28 Oct 2026, 07:00 EDT (UTC-04:00). Gaps are hours with a missing, zero or implausible report.
Data to 2026-10-28
Show the data table (168 rows)
Local hourReported demandDay-ahead forecast
21 Oct, 08:002,980 MW3,123 MW
21 Oct, 09:002,890 MW3,113 MW
21 Oct, 10:002,965 MW3,100 MW
21 Oct, 11:002,882 MW3,049 MW
21 Oct, 12:002,818 MW2,945 MW
21 Oct, 13:002,886 MW2,917 MW
21 Oct, 14:002,846 MW2,948 MW
21 Oct, 15:002,828 MW2,956 MW
21 Oct, 16:002,928 MW2,990 MW
21 Oct, 17:002,968 MW3,029 MW
21 Oct, 18:003,028 MW3,087 MW
21 Oct, 19:003,111 MW3,169 MW
21 Oct, 20:003,044 MW3,195 MW
21 Oct, 21:002,809 MW3,143 MW
21 Oct, 22:002,727 MW3,001 MW
21 Oct, 23:002,652 MW2,848 MW
22 Oct, 00:002,607 MW2,755 MW
22 Oct, 01:002,363 MW2,698 MW
22 Oct, 02:002,383 MW2,702 MW
22 Oct, 03:002,512 MW2,703 MW
22 Oct, 04:002,602 MW2,737 MW
22 Oct, 05:002,791 MW2,884 MW
22 Oct, 06:003,020 MW3,090 MW
22 Oct, 07:002,988 MW3,240 MW
22 Oct, 08:002,934 MW3,281 MW
22 Oct, 09:002,942 MW3,265 MW
22 Oct, 10:002,838 MW3,207 MW
22 Oct, 11:002,757 MW3,073 MW
22 Oct, 12:002,840 MW2,990 MW
22 Oct, 13:002,779 MW2,902 MW
22 Oct, 14:002,791 MW2,924 MW
22 Oct, 15:002,842 MW2,934 MW
22 Oct, 16:002,871 MW2,956 MW
22 Oct, 17:002,927 MW2,994 MW
22 Oct, 18:002,977 MW3,055 MW
22 Oct, 19:003,048 MW3,123 MW
22 Oct, 20:002,976 MW3,146 MW
22 Oct, 21:002,927 MW3,101 MW
22 Oct, 22:002,797 MW2,992 MW
22 Oct, 23:002,694 MW2,852 MW
23 Oct, 00:002,593 MW2,757 MW
23 Oct, 01:002,598 MW2,680 MW
23 Oct, 02:002,570 MW2,683 MW
23 Oct, 03:002,600 MW2,677 MW
23 Oct, 04:002,648 MW2,721 MW
23 Oct, 05:002,828 MW2,869 MW
23 Oct, 06:002,910 MW3,081 MW
23 Oct, 07:002,957 MW3,214 MW
23 Oct, 08:002,970 MW3,257 MW
23 Oct, 09:003,009 MW3,247 MW
23 Oct, 10:003,007 MW3,214 MW
23 Oct, 11:002,879 MW3,063 MW
23 Oct, 12:002,874 MW2,988 MW
23 Oct, 13:002,803 MW2,905 MW
23 Oct, 14:002,831 MW2,890 MW
23 Oct, 15:002,797 MW2,892 MW
23 Oct, 16:002,797 MW2,907 MW
23 Oct, 17:002,887 MW2,919 MW
23 Oct, 18:002,938 MW2,975 MW
23 Oct, 19:002,900 MW3,045 MW
23 Oct, 20:002,894 MW3,064 MW
23 Oct, 21:002,853 MW3,005 MW
23 Oct, 22:002,776 MW2,935 MW
23 Oct, 23:002,695 MW2,872 MW
24 Oct, 00:002,632 MW2,764 MW
24 Oct, 01:002,584 MW2,711 MW
24 Oct, 02:002,523 MW2,670 MW
24 Oct, 03:002,625 MW2,657 MW
24 Oct, 04:002,564 MW2,652 MW
24 Oct, 05:002,604 MW2,656 MW
24 Oct, 06:002,702 MW2,694 MW
24 Oct, 07:002,787 MW2,782 MW
24 Oct, 08:002,897 MW2,912 MW
24 Oct, 09:002,984 MW2,979 MW
24 Oct, 10:002,862 MW2,984 MW
24 Oct, 11:002,883 MW2,947 MW
24 Oct, 12:002,838 MW2,879 MW
24 Oct, 13:002,730 MW2,877 MW
24 Oct, 14:002,772 MW2,841 MW
24 Oct, 15:002,778 MW2,789 MW
24 Oct, 16:002,766 MW2,763 MW
24 Oct, 17:002,860 MW2,789 MW
24 Oct, 18:002,910 MW2,874 MW
24 Oct, 19:002,906 MW2,985 MW
24 Oct, 20:002,776 MW3,011 MW
24 Oct, 21:002,846 MW2,963 MW
24 Oct, 22:002,766 MW2,903 MW
24 Oct, 23:002,621 MW2,788 MW
25 Oct, 00:002,575 MW2,719 MW
25 Oct, 01:002,448 MW2,595 MW
25 Oct, 02:002,447 MW2,536 MW
25 Oct, 03:002,351 MW2,512 MW
25 Oct, 04:002,361 MW2,480 MW
25 Oct, 05:002,422 MW2,544 MW
25 Oct, 06:002,549 MW2,607 MW
25 Oct, 07:002,677 MW2,685 MW
25 Oct, 08:002,800 MW2,818 MW
25 Oct, 09:002,848 MW2,907 MW
25 Oct, 10:002,862 MW2,910 MW
25 Oct, 11:002,714 MW2,869 MW
25 Oct, 12:002,805 MW2,925 MW
25 Oct, 13:002,905 MW2,941 MW
25 Oct, 14:002,895 MW2,952 MW
25 Oct, 15:002,859 MW2,954 MW
25 Oct, 16:002,937 MW2,964 MW
25 Oct, 17:002,994 MW2,978 MW
25 Oct, 18:003,038 MW3,011 MW
25 Oct, 19:003,060 MW3,106 MW
25 Oct, 20:003,013 MW3,132 MW
25 Oct, 21:002,826 MW3,046 MW
25 Oct, 22:002,710 MW2,915 MW
25 Oct, 23:002,594 MW2,764 MW
26 Oct, 00:002,536 MW2,609 MW
26 Oct, 01:002,468 MW2,510 MW
26 Oct, 02:002,462 MW2,452 MW
26 Oct, 03:002,491 MW2,457 MW
26 Oct, 04:002,527 MW2,504 MW
26 Oct, 05:002,669 MW2,582 MW
26 Oct, 06:002,895 MW2,773 MW
26 Oct, 07:002,924 MW2,886 MW
26 Oct, 08:002,898 MW2,955 MW
26 Oct, 09:002,956 MW2,993 MW
26 Oct, 10:002,963 MW2,990 MW
26 Oct, 11:002,872 MW2,925 MW
26 Oct, 12:002,928 MW2,896 MW
26 Oct, 13:002,930 MW2,860 MW
26 Oct, 14:002,897 MW2,915 MW
26 Oct, 15:002,948 MW2,946 MW
26 Oct, 16:002,895 MW2,999 MW
26 Oct, 17:002,979 MW3,044 MW
26 Oct, 18:002,935 MW3,096 MW
26 Oct, 19:003,092 MW3,169 MW
26 Oct, 20:002,998 MW3,191 MW
26 Oct, 21:002,924 MW3,117 MW
26 Oct, 22:002,786 MW2,964 MW
26 Oct, 23:002,650 MW2,810 MW
27 Oct, 00:002,518 MW2,696 MW
27 Oct, 01:002,519 MW2,587 MW
27 Oct, 02:002,548 MW2,579 MW
27 Oct, 03:002,541 MW2,578 MW
27 Oct, 04:002,626 MW2,636 MW
27 Oct, 05:002,717 MW2,750 MW
27 Oct, 06:002,898 MW2,974 MW
27 Oct, 07:003,054 MW3,118 MW
27 Oct, 08:003,102 MW3,157 MW
27 Oct, 09:003,009 MW3,149 MW
27 Oct, 10:002,964 MW3,117 MW
27 Oct, 11:002,741 MW2,996 MW
27 Oct, 12:002,694 MW2,931 MW
27 Oct, 13:002,697 MW2,901 MW
27 Oct, 14:002,771 MW2,939 MW
27 Oct, 15:002,783 MW2,977 MW
27 Oct, 16:002,943 MW3,037 MW
27 Oct, 17:002,998 MW3,080 MW
27 Oct, 18:002,995 MW3,128 MW
27 Oct, 19:003,108 MW3,183 MW
27 Oct, 20:003,013 MW3,202 MW
27 Oct, 21:002,927 MW3,137 MW
27 Oct, 22:002,775 MW2,993 MW
27 Oct, 23:002,634 MW2,821 MW
28 Oct, 00:002,603 MW2,684 MW
28 Oct, 01:002,529 MW2,596 MW
28 Oct, 02:002,519 MW2,581 MW
28 Oct, 03:002,523 MW2,592 MW
28 Oct, 04:002,569 MW2,664 MW
28 Oct, 05:002,608 MW2,754 MW
28 Oct, 06:002,744 MW2,946 MW
28 Oct, 07:002,807 MW3,065 MW

Assumptions

  • Only hours with both a forecast and a positive demand reading count (719 of 720 hours in the window). Missing and zero values, and readings under 30% or over 3 times the grid's own median for the window, are treated as reporting faults and left out.
  • Error is (forecast minus reported demand) divided by reported demand; average error uses absolute values so high and low misses do not cancel. Bias keeps the sign and does cancel.
  • Reported demand is preliminary and may be revised. A 30 day window is a short sample and one heat wave or holiday can move these figures.
  • US figures are for the EIA balancing authority or region named on this page. US and European grids are ranked separately.
Cite this page
APA 7

World Power Monitor. (2026). SC Demand Forecast Accuracy: Error, Bias and Worst Miss. https://worldpowermonitor.com/forecast-accuracy/sc/

Plain text

World Power Monitor. SC Demand Forecast Accuracy: Error, Bias and Worst Miss. Data as of 2026-10-28. Data from U.S. Energy Information Administration. https://worldpowermonitor.com/forecast-accuracy/sc/

BibTeX 
@misc{wpm_forecast_accuracy_sc_2026,
  title = {{SC Demand Forecast Accuracy: Error, Bias and Worst Miss}},
  author = {{World Power Monitor}},
  year = {2026},
  note = {Data as of 2026-10-28. Data from U.S. Energy Information Administration.},
  url = {https://worldpowermonitor.com/forecast-accuracy/sc/}
}

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