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Built 2026-11-05 (5 November 2026)

Slovakia Demand Forecast Accuracy: Error, Bias and Worst Miss, 8 October to 5 November 2026

The day-ahead demand forecast for Slovakia was off by 2.2% on average (mean absolute percentage error) over 687 hours from 8 October to 5 November 2026, and 93% of hours landed within 5% of the reading. Its bias was -0.3%: it ran close to balanced on average. The largest miss was 306 MW (8.5%) too low at 2 Nov 2026, 12:00 CET (UTC+01:00). Dates and times are local (Europe/Bratislava).

Key Facts

  • The day-ahead demand forecast for Slovakia was off by 2.2% on average (mean absolute percentage error) over 687 hours from 8 October to 5 November 2026, and 93% of hours landed within 5% of the reading. Its bias was -0.3%: it ran close to balanced on average. The largest miss was 306 MW (8.5%) too low at 2 Nov 2026, 12:00 CET (UTC+01:00).
  • Across 47 European bidding zones ranked by average error over their own latest 30 day windows, Slovakia came 11 (1 is the smallest error).
  • On average the forecast differed from reported demand by 65 MW, against average demand of 2,976 MW.
  • The forecast was above reported demand in 44% of compared hours.

Forecast Error at a Glance

687 hours from 8 October to 5 November 2026
Average error2.2%
Bias-0.3%
Hours within 5%93%
Worst miss306 MW

Average error is the mean absolute percentage gap between the forecast and reported demand. Bias is the signed mean (-11 MW per hour on average): the forecast ran close to balanced on average. The worst miss was 306 MW (8.5%) too low at 2 Nov 2026, 12:00 CET (UTC+01:00): forecast 3,305 MW, reported 3,611 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 2026-11-05. 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 5 Nov 2026, 14:00 CET (UTC+01:00)
Slovakia day-ahead demand forecast and reported demand by hour Hourly reported demand and the day-ahead forecast for Slovakia over the last 7 days of the window, to 5 Nov 2026, 14:00 CET (UTC+01:00). Gaps are hours with a missing, zero or implausible report. 0 1,000 2,000 3,000 4,000 29 Oct, 15:0030 Oct, 15:0031 Oct, 15:001 Nov, 15:002 Nov, 15:003 Nov, 15:004 Nov, 15:00
Hourly reported demand and the day-ahead forecast for Slovakia over the last 7 days of the window, to 5 Nov 2026, 14:00 CET (UTC+01:00). Gaps are hours with a missing, zero or implausible report.
Data to 2026-11-05
Show the data table (168 rows)
Local hourReported demandDay-ahead forecast
29 Oct, 15:003,403 MW3,390 MW
29 Oct, 16:003,522 MW3,470 MW
29 Oct, 17:003,532 MW3,518 MW
29 Oct, 18:003,500 MW3,500 MW
29 Oct, 19:003,510 MW3,453 MW
29 Oct, 20:003,431 MW3,372 MW
29 Oct, 21:003,218 MW3,144 MW
29 Oct, 22:003,010 MW2,929 MW
29 Oct, 23:002,878 MW2,790 MW
30 Oct, 00:002,747 MW2,680 MW
30 Oct, 01:002,669 MW2,650 MW
30 Oct, 02:002,692 MW2,643 MW
30 Oct, 03:002,710 MW2,620 MW
30 Oct, 04:002,772 MW2,670 MW
30 Oct, 05:002,917 MW2,843 MW
30 Oct, 06:003,241 MW3,258 MW
30 Oct, 07:003,400 MW3,440 MW
30 Oct, 08:003,459 MW3,440 MW
30 Oct, 09:003,465 MW3,383 MW
30 Oct, 10:003,401 MW3,345 MW
30 Oct, 11:003,487 MW3,350 MW
30 Oct, 12:003,503 MW3,360 MW
30 Oct, 13:003,449 MW3,308 MW
30 Oct, 14:003,403 MW3,250 MW
30 Oct, 15:003,382 MW3,238 MW
30 Oct, 16:003,483 MW3,350 MW
30 Oct, 17:003,519 MW3,445 MW
30 Oct, 18:003,493 MW3,450 MW
30 Oct, 19:003,461 MW3,425 MW
30 Oct, 20:003,383 MW3,250 MW
30 Oct, 21:003,173 MW3,045 MW
30 Oct, 22:002,954 MW2,865 MW
30 Oct, 23:002,817 MW2,735 MW
31 Oct, 00:002,686 MW2,702 MW
31 Oct, 01:002,577 MW2,618 MW
31 Oct, 02:002,589 MW2,583 MW
31 Oct, 03:002,554 MW2,573 MW
31 Oct, 04:002,572 MW2,564 MW
31 Oct, 05:002,631 MW2,591 MW
31 Oct, 06:002,723 MW2,689 MW
31 Oct, 07:002,815 MW2,841 MW
31 Oct, 08:002,928 MW2,990 MW
31 Oct, 09:003,019 MW3,120 MW
31 Oct, 10:003,030 MW3,081 MW
31 Oct, 11:003,093 MW3,099 MW
31 Oct, 12:003,014 MW3,067 MW
31 Oct, 13:002,995 MW3,010 MW
31 Oct, 14:003,034 MW2,941 MW
31 Oct, 15:002,993 MW2,897 MW
31 Oct, 16:003,114 MW3,003 MW
31 Oct, 17:003,162 MW3,034 MW
31 Oct, 18:003,090 MW3,088 MW
31 Oct, 19:003,066 MW3,090 MW
31 Oct, 20:003,037 MW3,032 MW
31 Oct, 21:002,905 MW2,905 MW
31 Oct, 22:002,750 MW2,760 MW
31 Oct, 23:002,628 MW2,617 MW
1 Nov, 00:002,503 MW2,503 MW
1 Nov, 01:002,396 MW2,388 MW
1 Nov, 02:002,403 MW2,373 MW
1 Nov, 03:002,382 MW2,340 MW
1 Nov, 04:002,397 MW2,365 MW
1 Nov, 05:002,423 MW2,405 MW
1 Nov, 06:002,539 MW2,505 MW
1 Nov, 07:002,676 MW2,645 MW
1 Nov, 08:002,777 MW2,790 MW
1 Nov, 09:002,914 MW2,918 MW
1 Nov, 10:002,920 MW2,920 MW
1 Nov, 11:002,948 MW2,955 MW
1 Nov, 12:002,827 MW2,905 MW
1 Nov, 13:002,749 MW2,820 MW
1 Nov, 14:002,733 MW2,810 MW
1 Nov, 15:002,787 MW2,780 MW
1 Nov, 16:002,944 MW2,873 MW
1 Nov, 17:002,968 MW2,985 MW
1 Nov, 18:002,986 MW3,058 MW
1 Nov, 19:003,031 MW2,968 MW
1 Nov, 20:003,015 MW2,805 MW
1 Nov, 21:002,853 MW2,673 MW
1 Nov, 22:002,691 MW2,570 MW
1 Nov, 23:002,551 MW2,537 MW
2 Nov, 00:002,480 MW2,490 MW
2 Nov, 01:002,419 MW2,455 MW
2 Nov, 02:002,436 MW2,455 MW
2 Nov, 03:002,443 MW2,463 MW
2 Nov, 04:002,535 MW2,593 MW
2 Nov, 05:002,753 MW2,850 MW
2 Nov, 06:003,205 MW3,215 MW
2 Nov, 07:003,444 MW3,380 MW
2 Nov, 08:003,553 MW3,445 MW
2 Nov, 09:003,597 MW3,415 MW
2 Nov, 10:003,495 MW3,280 MW
2 Nov, 11:003,579 MW3,280 MW
2 Nov, 12:003,611 MW3,305 MW
2 Nov, 13:003,575 MW3,275 MW
2 Nov, 14:003,524 MW3,258 MW
2 Nov, 15:003,487 MW3,338 MW
2 Nov, 16:003,608 MW3,465 MW
2 Nov, 17:003,632 MW3,505 MW
2 Nov, 18:003,611 MW3,488 MW
2 Nov, 19:003,565 MW3,430 MW
2 Nov, 20:003,470 MW3,315 MW
2 Nov, 21:003,269 MW3,128 MW
2 Nov, 22:003,036 MW2,910 MW
2 Nov, 23:002,886 MW2,765 MW
3 Nov, 00:002,773 MW2,863 MW
3 Nov, 01:002,711 MW2,783 MW
3 Nov, 02:002,727 MW2,810 MW
3 Nov, 03:002,709 MW2,805 MW
3 Nov, 04:002,775 MW2,888 MW
3 Nov, 05:002,964 MW3,053 MW
3 Nov, 06:003,399 MW3,393 MW
3 Nov, 07:003,565 MW3,758 MW
3 Nov, 08:003,641 MW3,758 MW
3 Nov, 09:003,717 MW3,705 MW
3 Nov, 10:003,638 MW3,510 MW
3 Nov, 11:003,690 MW3,520 MW
3 Nov, 12:003,696 MW3,533 MW
3 Nov, 13:003,641 MW3,490 MW
3 Nov, 14:003,581 MW3,418 MW
3 Nov, 15:003,548 MW3,460 MW
3 Nov, 16:003,667 MW3,580 MW
3 Nov, 17:003,668 MW3,660 MW
3 Nov, 18:003,649 MW3,700 MW
3 Nov, 19:003,599 MW3,673 MW
3 Nov, 20:003,515 MW3,580 MW
3 Nov, 21:003,266 MW3,348 MW
3 Nov, 22:003,032 MW3,128 MW
3 Nov, 23:002,904 MW3,053 MW
4 Nov, 00:002,826 MW2,857 MW
4 Nov, 01:002,747 MW2,783 MW
4 Nov, 02:002,769 MW2,810 MW
4 Nov, 03:002,745 MW2,807 MW
4 Nov, 04:002,799 MW2,915 MW
4 Nov, 05:003,005 MW3,124 MW
4 Nov, 06:003,411 MW3,473 MW
4 Nov, 07:003,525 MW3,613 MW
4 Nov, 08:003,522 MW3,620 MW
4 Nov, 09:003,506 MW3,559 MW
4 Nov, 10:003,364 MW3,362 MW
4 Nov, 11:003,353 MW3,383 MW
4 Nov, 12:003,360 MW3,388 MW
4 Nov, 13:003,322 MW3,350 MW
4 Nov, 14:003,319 MW3,439 MW
4 Nov, 15:003,400 MW3,523 MW
4 Nov, 16:003,634 MW3,713 MW
4 Nov, 17:003,676 MW3,724 MW
4 Nov, 18:003,646 MW3,704 MW
4 Nov, 19:003,618 MW3,648 MW
4 Nov, 20:003,520 MW3,463 MW
4 Nov, 21:003,315 MW3,236 MW
4 Nov, 22:003,103 MW3,019 MW
4 Nov, 23:002,975 MW2,948 MW
5 Nov, 00:002,871 MW2,820 MW
5 Nov, 01:002,810 MW2,743 MW
5 Nov, 02:002,825 MW2,770 MW
5 Nov, 03:002,811 MW2,768 MW
5 Nov, 04:002,870 MW2,875 MW
5 Nov, 05:003,075 MW3,085 MW
5 Nov, 06:003,435 MW3,433 MW
5 Nov, 07:003,597 MW3,575 MW
5 Nov, 08:003,563 MW3,578 MW
5 Nov, 09:003,491 MW3,518 MW
5 Nov, 10:003,280 MW3,323 MW
5 Nov, 11:003,275 MW3,343 MW
5 Nov, 12:003,264 MW3,345 MW
5 Nov, 13:003,246 MW3,310 MW
5 Nov, 14:003,299 MW3,400 MW

Assumptions

  • Only hours with both a forecast and a positive demand reading count (687 of 687 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). Slovakia Demand Forecast Accuracy: Error, Bias and Worst Miss. https://worldpowermonitor.com/forecast-accuracy/sk/

Plain text

World Power Monitor. Slovakia Demand Forecast Accuracy: Error, Bias and Worst Miss. Data as of 2026-11-05. Data from ENTSO-E Transparency Platform. https://worldpowermonitor.com/forecast-accuracy/sk/

BibTeX 
@misc{wpm_forecast_accuracy_sk_2026,
  title = {{Slovakia Demand Forecast Accuracy: Error, Bias and Worst Miss}},
  author = {{World Power Monitor}},
  year = {2026},
  note = {Data as of 2026-11-05. Data from ENTSO-E Transparency Platform.},
  url = {https://worldpowermonitor.com/forecast-accuracy/sk/}
}

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