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Built 2026-10-28 (28 October 2026)

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

The day-ahead demand forecast for SCEG was off by 5.0% on average (mean absolute percentage error) over 719 hours from 28 September to 28 October 2026, and 61% of hours landed within 5% of the reading. Its bias was -3.9%: it ran low on average, an under forecast. The largest miss was 635 MW (20.2%) too low at 29 Sept 2026, 10:00 EDT (UTC-04:00). Dates and times are local (America/New_York).

Key Facts

  • The day-ahead demand forecast for SCEG was off by 5.0% on average (mean absolute percentage error) over 719 hours from 28 September to 28 October 2026, and 61% of hours landed within 5% of the reading. Its bias was -3.9%: it ran low on average, an under forecast. The largest miss was 635 MW (20.2%) too low at 29 Sept 2026, 10:00 EDT (UTC-04:00).
  • Across 53 US grids ranked by average error over their own latest 30 day windows, SCEG came 33 (1 is the smallest error).
  • On average the forecast differed from reported demand by 135 MW, against average demand of 2,639 MW.
  • The forecast was above reported demand in 23% of compared hours.

Forecast Error at a Glance

719 hours from 28 September to 28 October 2026
Average error5.0%
Bias-3.9%
Hours within 5%61%
Worst miss635 MW

Average error is the mean absolute percentage gap between the forecast and reported demand. Bias is the signed mean (-107 MW per hour on average): the forecast ran low on average, an under forecast. The worst miss was 635 MW (20.2%) too low at 29 Sept 2026, 10:00 EDT (UTC-04:00): forecast 2,509 MW, reported 3,144 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)
SCEG day-ahead demand forecast and reported demand by hour Hourly reported demand and the day-ahead forecast for SCEG 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. 0 750 1,500 2,250 3,000 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 SCEG 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, 08:002,530 MW2,426 MW
21 Oct, 09:002,698 MW2,370 MW
21 Oct, 10:002,810 MW2,366 MW
21 Oct, 11:002,846 MW2,321 MW
21 Oct, 12:002,799 MW2,304 MW
21 Oct, 13:002,902 MW2,319 MW
21 Oct, 14:002,836 MW2,340 MW
21 Oct, 15:002,851 MW2,411 MW
21 Oct, 16:002,838 MW2,470 MW
21 Oct, 17:002,597 MW2,522 MW
21 Oct, 18:002,494 MW2,508 MW
21 Oct, 19:002,563 MW2,550 MW
21 Oct, 20:002,477 MW2,490 MW
21 Oct, 21:002,359 MW2,389 MW
21 Oct, 22:002,207 MW2,275 MW
21 Oct, 23:002,080 MW2,152 MW
22 Oct, 00:002,005 MW2,054 MW
22 Oct, 01:001,989 MW2,014 MW
22 Oct, 02:001,957 MW1,996 MW
22 Oct, 03:001,969 MW2,000 MW
22 Oct, 04:002,017 MW2,060 MW
22 Oct, 05:002,147 MW2,185 MW
22 Oct, 06:002,373 MW2,379 MW
22 Oct, 07:002,474 MW2,438 MW
22 Oct, 08:002,478 MW2,412 MW
22 Oct, 09:002,519 MW2,391 MW
22 Oct, 10:002,620 MW2,373 MW
22 Oct, 11:002,640 MW2,326 MW
22 Oct, 12:002,679 MW2,316 MW
22 Oct, 13:002,743 MW2,345 MW
22 Oct, 14:002,832 MW2,355 MW
22 Oct, 15:002,798 MW2,408 MW
22 Oct, 16:002,730 MW2,473 MW
22 Oct, 17:002,561 MW2,525 MW
22 Oct, 18:002,500 MW2,511 MW
22 Oct, 19:002,525 MW2,498 MW
22 Oct, 20:002,476 MW2,463 MW
22 Oct, 21:002,421 MW2,363 MW
22 Oct, 22:002,300 MW2,246 MW
22 Oct, 23:002,159 MW2,121 MW
23 Oct, 00:002,047 MW2,036 MW
23 Oct, 01:002,001 MW1,998 MW
23 Oct, 02:002,004 MW1,975 MW
23 Oct, 03:001,993 MW1,983 MW
23 Oct, 04:002,046 MW2,024 MW
23 Oct, 05:002,131 MW2,163 MW
23 Oct, 06:002,380 MW2,380 MW
23 Oct, 07:002,532 MW2,500 MW
23 Oct, 08:002,525 MW2,479 MW
23 Oct, 09:002,692 MW2,451 MW
23 Oct, 10:002,830 MW2,408 MW
23 Oct, 11:002,814 MW2,376 MW
23 Oct, 12:002,680 MW2,317 MW
23 Oct, 13:002,680 MW2,320 MW
23 Oct, 14:002,663 MW2,332 MW
23 Oct, 15:002,681 MW2,352 MW
23 Oct, 16:002,702 MW2,385 MW
23 Oct, 17:002,545 MW2,425 MW
23 Oct, 18:002,436 MW2,433 MW
23 Oct, 19:002,431 MW2,454 MW
23 Oct, 20:002,421 MW2,406 MW
23 Oct, 21:002,351 MW2,313 MW
23 Oct, 22:002,253 MW2,228 MW
23 Oct, 23:002,162 MW2,115 MW
24 Oct, 00:002,079 MW2,057 MW
24 Oct, 01:002,024 MW1,991 MW
24 Oct, 02:001,983 MW1,953 MW
24 Oct, 03:001,999 MW1,938 MW
24 Oct, 04:001,970 MW1,961 MW
24 Oct, 05:002,034 MW1,998 MW
24 Oct, 06:002,087 MW2,045 MW
24 Oct, 07:002,200 MW2,110 MW
24 Oct, 08:002,256 MW2,217 MW
24 Oct, 09:002,459 MW2,300 MW
24 Oct, 10:002,621 MW2,283 MW
24 Oct, 11:002,606 MW2,228 MW
24 Oct, 12:002,582 MW2,177 MW
24 Oct, 13:002,573 MW2,128 MW
24 Oct, 14:002,619 MW2,139 MW
24 Oct, 15:002,545 MW2,147 MW
24 Oct, 16:002,458 MW2,193 MW
24 Oct, 17:002,393 MW2,241 MW
24 Oct, 18:002,383 MW2,305 MW
24 Oct, 19:002,412 MW2,366 MW
24 Oct, 20:002,360 MW2,375 MW
24 Oct, 21:002,309 MW2,288 MW
24 Oct, 22:002,204 MW2,194 MW
24 Oct, 23:002,099 MW2,086 MW
25 Oct, 00:002,002 MW2,011 MW
25 Oct, 01:001,948 MW1,955 MW
25 Oct, 02:001,922 MW1,918 MW
25 Oct, 03:001,890 MW1,905 MW
25 Oct, 04:001,903 MW1,923 MW
25 Oct, 05:001,905 MW1,958 MW
25 Oct, 06:001,985 MW2,004 MW
25 Oct, 07:002,073 MW2,030 MW
25 Oct, 08:002,159 MW2,076 MW
25 Oct, 09:002,428 MW2,115 MW
25 Oct, 10:002,572 MW2,131 MW
25 Oct, 11:002,590 MW2,129 MW
25 Oct, 12:002,616 MW2,122 MW
25 Oct, 13:002,539 MW2,071 MW
25 Oct, 14:002,610 MW2,091 MW
25 Oct, 15:002,552 MW2,180 MW
25 Oct, 16:002,461 MW2,226 MW
25 Oct, 17:002,459 MW2,317 MW
25 Oct, 18:002,492 MW2,338 MW
25 Oct, 19:002,594 MW2,400 MW
25 Oct, 20:002,490 MW2,393 MW
25 Oct, 21:002,376 MW2,309 MW
25 Oct, 22:002,246 MW2,177 MW
25 Oct, 23:002,103 MW2,056 MW
26 Oct, 00:002,003 MW1,985 MW
26 Oct, 01:001,962 MW1,942 MW
26 Oct, 02:001,921 MW1,911 MW
26 Oct, 03:001,913 MW1,915 MW
26 Oct, 04:001,950 MW1,971 MW
26 Oct, 05:002,072 MW2,099 MW
26 Oct, 06:002,305 MW2,311 MW
26 Oct, 07:002,421 MW2,375 MW
26 Oct, 08:002,457 MW2,352 MW
26 Oct, 09:002,799 MW2,328 MW
26 Oct, 10:002,789 MW2,332 MW
26 Oct, 11:002,707 MW2,298 MW
26 Oct, 12:002,709 MW2,277 MW
26 Oct, 13:002,738 MW2,306 MW
26 Oct, 14:002,779 MW2,356 MW
26 Oct, 15:002,820 MW2,420 MW
26 Oct, 16:002,836 MW2,499 MW
26 Oct, 17:002,607 MW2,546 MW
26 Oct, 18:002,561 MW2,516 MW
26 Oct, 19:002,603 MW2,550 MW
26 Oct, 20:002,516 MW2,498 MW
26 Oct, 21:002,386 MW2,404 MW
26 Oct, 22:002,252 MW2,266 MW
26 Oct, 23:002,115 MW2,131 MW
27 Oct, 00:002,015 MW1,989 MW
27 Oct, 01:002,046 MW1,954 MW
27 Oct, 02:002,019 MW1,935 MW
27 Oct, 03:002,036 MW1,946 MW
27 Oct, 04:002,044 MW2,002 MW
27 Oct, 05:002,113 MW2,135 MW
27 Oct, 06:002,352 MW2,349 MW
27 Oct, 07:002,475 MW2,410 MW
27 Oct, 08:002,473 MW2,375 MW
27 Oct, 09:002,558 MW2,344 MW
27 Oct, 10:002,667 MW2,324 MW
27 Oct, 11:002,619 MW2,311 MW
27 Oct, 12:002,592 MW2,308 MW
27 Oct, 13:002,614 MW2,342 MW
27 Oct, 14:002,653 MW2,405 MW
27 Oct, 15:002,702 MW2,484 MW
27 Oct, 16:002,761 MW2,558 MW
27 Oct, 17:002,719 MW2,606 MW
27 Oct, 18:002,567 MW2,567 MW
27 Oct, 19:002,607 MW2,537 MW
27 Oct, 20:002,518 MW2,469 MW
27 Oct, 21:002,382 MW2,341 MW
27 Oct, 22:002,272 MW2,211 MW
27 Oct, 23:002,117 MW2,074 MW
28 Oct, 00:001,996 MW2,061 MW
28 Oct, 01:001,992 MW2,020 MW
28 Oct, 02:001,954 MW1,987 MW
28 Oct, 03:001,939 MW1,989 MW
28 Oct, 04:001,981 MW2,032 MW
28 Oct, 05:002,135 MW2,139 MW
28 Oct, 06:002,390 MW2,351 MW
28 Oct, 07:002,458 MW2,423 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). SCEG Demand Forecast Accuracy: Error, Bias and Worst Miss. https://worldpowermonitor.com/forecast-accuracy/sceg/

Plain text

World Power Monitor. SCEG 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/sceg/

BibTeX 
@misc{wpm_forecast_accuracy_sceg_2026,
  title = {{SCEG 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/sceg/}
}

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