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Built 2026-10-28 (28 October 2026)

Slovenia Demand Forecast Accuracy: Error, Bias and Worst Miss, 30 September to 28 October 2026

The day-ahead demand forecast for Slovenia was off by 3.3% on average (mean absolute percentage error) over 686 hours from 30 September to 28 October 2026, and 82% of hours landed within 5% of the reading. Its bias was +0.1%: it ran close to balanced on average. The largest miss was 918 MW (100.3%) too high at 13 Oct 2026, 09:00 CEST (UTC+02:00). Dates and times are local (Europe/Ljubljana).

Key Facts

  • The day-ahead demand forecast for Slovenia was off by 3.3% on average (mean absolute percentage error) over 686 hours from 30 September to 28 October 2026, and 82% of hours landed within 5% of the reading. Its bias was +0.1%: it ran close to balanced on average. The largest miss was 918 MW (100.3%) too high at 13 Oct 2026, 09:00 CEST (UTC+02:00).
  • Across 47 European bidding zones ranked by average error over their own latest 30 day windows, Slovenia came 23 (1 is the smallest error).
  • On average the forecast differed from reported demand by 49 MW, against average demand of 1,506 MW.
  • The forecast was above reported demand in 49% of compared hours.

Forecast Error at a Glance

686 hours from 30 September to 28 October 2026
Average error3.3%
Bias+0.1%
Hours within 5%82%
Worst miss918 MW

Average error is the mean absolute percentage gap between the forecast and reported demand. Bias is the signed mean (-3 MW per hour on average): the forecast ran close to balanced on average. The worst miss was 918 MW (100.3%) too high at 13 Oct 2026, 09:00 CEST (UTC+02:00): forecast 1,834 MW, reported 915 MW.

Source: ENTSO-E Transparency Platform (transparency.entsoe.eu), CC BY 4.0. Aggregated and converted by World Power Monitor; ENTSO-E does not endorse this site. (ENTSO-E Terms of Use plus CC BY 4.0 for listed data items) 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, 13:00 CET (UTC+01:00)
Slovenia day-ahead demand forecast and reported demand by hour Hourly reported demand and the day-ahead forecast for Slovenia over the last 7 days of the window, to 28 Oct 2026, 13:00 CET (UTC+01:00). Gaps are hours with a missing, zero or implausible report. 0 625 1,250 1,875 2,500 21 Oct, 15:0022 Oct, 15:0023 Oct, 15:0024 Oct, 15:0025 Oct, 14:0026 Oct, 14:0027 Oct, 14:00
Hourly reported demand and the day-ahead forecast for Slovenia over the last 7 days of the window, to 28 Oct 2026, 13:00 CET (UTC+01:00). 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, 15:001,701 MW1,702 MW
21 Oct, 16:001,658 MW1,671 MW
21 Oct, 17:001,690 MW1,668 MW
21 Oct, 18:001,717 MW1,720 MW
21 Oct, 19:001,727 MW1,720 MW
21 Oct, 20:001,720 MW1,684 MW
21 Oct, 21:001,597 MW1,579 MW
21 Oct, 22:001,497 MW1,470 MW
21 Oct, 23:001,371 MW1,377 MW
22 Oct, 00:001,347 MW1,307 MW
22 Oct, 01:001,273 MW1,264 MW
22 Oct, 02:001,253 MW1,229 MW
22 Oct, 03:001,282 MW1,226 MW
22 Oct, 04:001,309 MW1,262 MW
22 Oct, 05:001,373 MW1,325 MW
22 Oct, 06:001,642 MW1,555 MW
22 Oct, 07:001,738 MW1,749 MW
22 Oct, 08:001,769 MW1,831 MW
22 Oct, 09:001,770 MW1,875 MW
22 Oct, 10:001,805 MW1,882 MW
22 Oct, 11:001,809 MW1,923 MW
22 Oct, 12:001,793 MW1,877 MW
22 Oct, 13:001,817 MW1,844 MW
22 Oct, 14:001,782 MW1,749 MW
22 Oct, 15:001,704 MW1,685 MW
22 Oct, 16:001,595 MW1,649 MW
22 Oct, 17:001,571 MW1,680 MW
22 Oct, 18:001,717 MW1,783 MW
22 Oct, 19:001,766 MW1,796 MW
22 Oct, 20:001,713 MW1,763 MW
22 Oct, 21:001,611 MW1,632 MW
22 Oct, 22:001,538 MW1,546 MW
22 Oct, 23:001,441 MW1,445 MW
23 Oct, 00:001,408 MW1,378 MW
23 Oct, 01:001,342 MW1,346 MW
23 Oct, 02:001,334 MW1,312 MW
23 Oct, 03:001,322 MW1,317 MW
23 Oct, 04:001,351 MW1,335 MW
23 Oct, 05:001,446 MW1,442 MW
23 Oct, 06:001,827 MW1,650 MW
23 Oct, 07:002,346 MW1,797 MW
23 Oct, 08:002,073 MW1,884 MW
23 Oct, 09:001,955 MW1,888 MW
23 Oct, 10:001,910 MW1,875 MW
23 Oct, 11:001,962 MW1,850 MW
23 Oct, 12:001,980 MW1,824 MW
23 Oct, 13:001,918 MW1,777 MW
23 Oct, 14:001,828 MW1,690 MW
23 Oct, 15:001,777 MW1,629 MW
23 Oct, 16:001,672 MW1,599 MW
23 Oct, 17:001,811 MW1,609 MW
23 Oct, 18:001,984 MW1,725 MW
23 Oct, 19:001,777 MW1,749 MW
23 Oct, 20:001,688 MW1,695 MW
23 Oct, 21:001,603 MW1,573 MW
23 Oct, 22:001,563 MW1,477 MW
23 Oct, 23:001,457 MW1,381 MW
24 Oct, 00:001,310 MW1,276 MW
24 Oct, 01:001,231 MW1,211 MW
24 Oct, 02:001,207 MW1,164 MW
24 Oct, 03:001,174 MW1,160 MW
24 Oct, 04:001,187 MW1,151 MW
24 Oct, 05:001,169 MW1,166 MW
24 Oct, 06:001,268 MW1,288 MW
24 Oct, 07:001,330 MW1,388 MW
24 Oct, 08:001,462 MW1,507 MW
24 Oct, 09:001,566 MW1,563 MW
24 Oct, 10:001,576 MW1,610 MW
24 Oct, 11:001,632 MW1,691 MW
24 Oct, 12:001,711 MW1,689 MW
24 Oct, 13:001,669 MW1,636 MW
24 Oct, 14:001,536 MW1,546 MW
24 Oct, 15:001,453 MW1,497 MW
24 Oct, 16:001,443 MW1,498 MW
24 Oct, 17:001,450 MW1,515 MW
24 Oct, 18:001,449 MW1,545 MW
24 Oct, 19:001,441 MW1,563 MW
24 Oct, 20:001,432 MW1,534 MW
24 Oct, 21:001,412 MW1,463 MW
24 Oct, 22:001,315 MW1,376 MW
24 Oct, 23:001,284 MW1,309 MW
25 Oct, 00:001,192 MW1,216 MW
25 Oct, 01:001,139 MW1,209 MW
25 Oct, 02:001,098 MW1,179 MW
25 Oct, 02:001,074 MW1,167 MW
25 Oct, 03:001,089 MW1,171 MW
25 Oct, 04:001,083 MW1,182 MW
25 Oct, 05:001,126 MW1,239 MW
25 Oct, 06:001,230 MW1,343 MW
25 Oct, 07:001,343 MW1,401 MW
25 Oct, 08:001,440 MW1,453 MW
25 Oct, 09:001,505 MW1,497 MW
25 Oct, 10:001,484 MW1,549 MW
25 Oct, 11:001,601 MW1,534 MW
25 Oct, 12:001,550 MW1,506 MW
25 Oct, 13:001,484 MW1,456 MW
25 Oct, 14:001,396 MW1,362 MW
25 Oct, 15:001,391 MW1,347 MW
25 Oct, 16:001,401 MW1,468 MW
25 Oct, 17:001,482 MW1,506 MW
25 Oct, 18:001,511 MW1,560 MW
25 Oct, 19:001,509 MW1,559 MW
25 Oct, 20:001,456 MW1,499 MW
25 Oct, 21:001,403 MW1,441 MW
25 Oct, 22:001,358 MW1,323 MW
25 Oct, 23:001,305 MW1,234 MW
26 Oct, 00:001,228 MW1,126 MW
26 Oct, 01:001,201 MW1,140 MW
26 Oct, 02:001,185 MW1,147 MW
26 Oct, 03:001,181 MW1,176 MW
26 Oct, 04:001,249 MW1,274 MW
26 Oct, 05:001,389 MW1,496 MW
26 Oct, 06:001,616 MW1,714 MW
26 Oct, 07:001,746 MW1,858 MW
26 Oct, 08:001,854 MW1,887 MW
26 Oct, 09:001,940 MW1,838 MW
26 Oct, 10:001,964 MW1,825 MW
26 Oct, 11:002,009 MW1,803 MW
26 Oct, 12:001,921 MW1,785 MW
26 Oct, 13:001,826 MW1,725 MW
26 Oct, 14:001,729 MW1,663 MW
26 Oct, 15:001,635 MW1,624 MW
26 Oct, 16:001,569 MW1,649 MW
26 Oct, 17:001,683 MW1,778 MW
26 Oct, 18:001,714 MW1,813 MW
26 Oct, 19:001,747 MW1,785 MW
26 Oct, 20:001,714 MW1,675 MW
26 Oct, 21:001,604 MW1,590 MW
26 Oct, 22:001,527 MW1,527 MW
26 Oct, 23:001,436 MW1,456 MW
27 Oct, 00:001,401 MW1,256 MW
27 Oct, 01:001,358 MW1,320 MW
27 Oct, 02:001,348 MW1,322 MW
27 Oct, 03:001,377 MW1,328 MW
27 Oct, 04:001,392 MW1,385 MW
27 Oct, 05:001,497 MW1,541 MW
27 Oct, 06:001,990 MW1,725 MW
27 Oct, 07:002,024 MW1,861 MW
27 Oct, 08:001,944 MW1,907 MW
27 Oct, 09:001,899 MW1,899 MW
27 Oct, 10:001,812 MW1,866 MW
27 Oct, 11:001,843 MW1,838 MW
27 Oct, 12:001,936 MW1,801 MW
27 Oct, 13:001,833 MW1,769 MW
27 Oct, 14:001,751 MW1,711 MW
27 Oct, 15:001,767 MW1,671 MW
27 Oct, 16:001,912 MW1,688 MW
27 Oct, 17:001,958 MW1,782 MW
27 Oct, 18:001,851 MW1,828 MW
27 Oct, 19:001,822 MW1,796 MW
27 Oct, 20:001,800 MW1,699 MW
27 Oct, 21:001,684 MW1,625 MW
27 Oct, 22:001,602 MW1,532 MW
27 Oct, 23:001,526 MW1,458 MW
28 Oct, 00:001,460 MW1,344 MW
28 Oct, 01:001,420 MW1,355 MW
28 Oct, 02:001,403 MW1,377 MW
28 Oct, 03:001,415 MW1,379 MW
28 Oct, 04:001,404 MW1,424 MW
28 Oct, 05:001,536 MW1,596 MW
28 Oct, 06:001,960 MW1,781 MW
28 Oct, 07:002,048 MW1,870 MW
28 Oct, 08:001,931 MW1,931 MW
28 Oct, 09:001,957 MW1,946 MW
28 Oct, 10:001,913 MW1,973 MW
28 Oct, 11:001,916 MW1,893 MW
28 Oct, 12:001,917 MW1,868 MW
28 Oct, 13:001,414 MW1,805 MW

Assumptions

  • Only hours with both a forecast and a positive demand reading count (686 of 686 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.
  • European figures are for the ENTSO-E bidding zone named on this page. US and European grids are ranked separately.
Cite this page
APA 7

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

Plain text

World Power Monitor. Slovenia Demand Forecast Accuracy: Error, Bias and Worst Miss. Data as of 2026-10-28. Data from ENTSO-E Transparency Platform. https://worldpowermonitor.com/forecast-accuracy/si/

BibTeX 
@misc{wpm_forecast_accuracy_si_2026,
  title = {{Slovenia Demand Forecast Accuracy: Error, Bias and Worst Miss}},
  author = {{World Power Monitor}},
  year = {2026},
  note = {Data as of 2026-10-28. Data from ENTSO-E Transparency Platform.},
  url = {https://worldpowermonitor.com/forecast-accuracy/si/}
}

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