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Built 2026-11-12 (12 November 2026)

Slovakia Demand Forecast Accuracy: Error, Bias and Worst Miss, 15 October to 12 November 2026

The day-ahead demand forecast for Slovakia was off by 2.3% on average (mean absolute percentage error) over 687 hours from 15 October to 12 November 2026, and 93% of hours landed within 5% of the reading. Its bias was -0.2%: 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 2.3% on average (mean absolute percentage error) over 687 hours from 15 October to 12 November 2026, and 93% of hours landed within 5% of the reading. Its bias was -0.2%: 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 69 MW, against average demand of 3,079 MW.
  • The forecast was above reported demand in 45% of compared hours.

Forecast Error at a Glance

687 hours from 15 October to 12 November 2026
Average error2.3%
Bias-0.2%
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 (-9 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 2026-11-12. 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 12 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 12 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 5 Nov, 15:006 Nov, 15:007 Nov, 15:008 Nov, 15:009 Nov, 15:0010 Nov, 15:0011 Nov, 15:00
Hourly reported demand and the day-ahead forecast for Slovakia over the last 7 days of the window, to 12 Nov 2026, 14:00 CET (UTC+01:00). Gaps are hours with a missing, zero or implausible report.
Data to 2026-11-12
Show the data table (168 rows)
Local hourReported demandDay-ahead forecast
5 Nov, 15:003,384 MW3,485 MW
5 Nov, 16:003,620 MW3,673 MW
5 Nov, 17:003,670 MW3,683 MW
5 Nov, 18:003,669 MW3,665 MW
5 Nov, 19:003,618 MW3,608 MW
5 Nov, 20:003,521 MW3,425 MW
5 Nov, 21:003,319 MW3,198 MW
5 Nov, 22:003,093 MW2,980 MW
5 Nov, 23:002,961 MW2,908 MW
6 Nov, 00:002,874 MW2,843 MW
6 Nov, 01:002,823 MW2,767 MW
6 Nov, 02:002,877 MW2,790 MW
6 Nov, 03:002,852 MW2,788 MW
6 Nov, 04:002,941 MW2,863 MW
6 Nov, 05:003,130 MW3,037 MW
6 Nov, 06:003,506 MW3,405 MW
6 Nov, 07:003,660 MW3,574 MW
6 Nov, 08:003,591 MW3,574 MW
6 Nov, 09:003,510 MW3,486 MW
6 Nov, 10:003,318 MW3,362 MW
6 Nov, 11:003,363 MW3,367 MW
6 Nov, 12:003,330 MW3,369 MW
6 Nov, 13:003,270 MW3,354 MW
6 Nov, 14:003,264 MW3,348 MW
6 Nov, 15:003,343 MW3,390 MW
6 Nov, 16:003,518 MW3,542 MW
6 Nov, 17:003,589 MW3,650 MW
6 Nov, 18:003,573 MW3,616 MW
6 Nov, 19:003,565 MW3,547 MW
6 Nov, 20:003,479 MW3,428 MW
6 Nov, 21:003,262 MW3,224 MW
6 Nov, 22:003,082 MW3,036 MW
6 Nov, 23:002,940 MW2,928 MW
7 Nov, 00:002,817 MW2,794 MW
7 Nov, 01:002,718 MW2,701 MW
7 Nov, 02:002,711 MW2,711 MW
7 Nov, 03:002,691 MW2,670 MW
7 Nov, 04:002,748 MW2,701 MW
7 Nov, 05:002,802 MW2,748 MW
7 Nov, 06:002,919 MW2,846 MW
7 Nov, 07:003,019 MW2,960 MW
7 Nov, 08:003,041 MW3,093 MW
7 Nov, 09:003,084 MW3,135 MW
7 Nov, 10:002,990 MW3,113 MW
7 Nov, 11:003,058 MW3,140 MW
7 Nov, 12:002,979 MW3,068 MW
7 Nov, 13:002,928 MW3,015 MW
7 Nov, 14:002,936 MW3,004 MW
7 Nov, 15:003,042 MW3,005 MW
7 Nov, 16:003,248 MW3,121 MW
7 Nov, 17:003,274 MW3,142 MW
7 Nov, 18:003,249 MW3,201 MW
7 Nov, 19:003,264 MW3,187 MW
7 Nov, 20:003,175 MW3,138 MW
7 Nov, 21:003,048 MW2,963 MW
7 Nov, 22:002,915 MW2,799 MW
7 Nov, 23:002,812 MW2,666 MW
8 Nov, 00:002,685 MW2,621 MW
8 Nov, 01:002,589 MW2,556 MW
8 Nov, 02:002,636 MW2,549 MW
8 Nov, 03:002,610 MW2,536 MW
8 Nov, 04:002,660 MW2,569 MW
8 Nov, 05:002,705 MW2,629 MW
8 Nov, 06:002,830 MW2,722 MW
8 Nov, 07:002,952 MW2,854 MW
8 Nov, 08:002,992 MW2,963 MW
8 Nov, 09:003,053 MW3,047 MW
8 Nov, 10:003,018 MW3,041 MW
8 Nov, 11:003,064 MW3,043 MW
8 Nov, 12:002,920 MW2,937 MW
8 Nov, 13:002,837 MW2,843 MW
8 Nov, 14:002,874 MW2,831 MW
8 Nov, 15:002,952 MW2,905 MW
8 Nov, 16:003,135 MW3,084 MW
8 Nov, 17:003,223 MW3,157 MW
8 Nov, 18:003,229 MW3,155 MW
8 Nov, 19:003,252 MW3,174 MW
8 Nov, 20:003,211 MW3,127 MW
8 Nov, 21:003,033 MW2,964 MW
8 Nov, 22:002,931 MW2,814 MW
8 Nov, 23:002,824 MW2,678 MW
9 Nov, 00:002,732 MW2,710 MW
9 Nov, 01:002,665 MW2,657 MW
9 Nov, 02:002,724 MW2,678 MW
9 Nov, 03:002,717 MW2,691 MW
9 Nov, 04:002,838 MW2,798 MW
9 Nov, 05:003,040 MW3,027 MW
9 Nov, 06:003,448 MW3,517 MW
9 Nov, 07:003,635 MW3,700 MW
9 Nov, 08:003,663 MW3,777 MW
9 Nov, 09:003,710 MW3,788 MW
9 Nov, 10:003,594 MW3,673 MW
9 Nov, 11:003,682 MW3,708 MW
9 Nov, 12:003,669 MW3,736 MW
9 Nov, 13:003,626 MW3,693 MW
9 Nov, 14:003,576 MW3,658 MW
9 Nov, 15:003,560 MW3,650 MW
9 Nov, 16:003,687 MW3,785 MW
9 Nov, 17:003,672 MW3,838 MW
9 Nov, 18:003,700 MW3,797 MW
9 Nov, 19:003,683 MW3,738 MW
9 Nov, 20:003,608 MW3,625 MW
9 Nov, 21:003,390 MW3,442 MW
9 Nov, 22:003,167 MW3,226 MW
9 Nov, 23:003,046 MW3,087 MW
10 Nov, 00:002,940 MW2,936 MW
10 Nov, 01:002,887 MW2,859 MW
10 Nov, 02:002,910 MW2,869 MW
10 Nov, 03:002,885 MW2,866 MW
10 Nov, 04:002,946 MW2,946 MW
10 Nov, 05:003,145 MW3,137 MW
10 Nov, 06:003,548 MW3,575 MW
10 Nov, 07:003,687 MW3,752 MW
10 Nov, 08:003,794 MW3,807 MW
10 Nov, 09:003,912 MW3,838 MW
10 Nov, 10:003,856 MW3,721 MW
10 Nov, 11:003,947 MW3,743 MW
10 Nov, 12:003,960 MW3,745 MW
10 Nov, 13:003,884 MW3,667 MW
10 Nov, 14:003,807 MW3,620 MW
10 Nov, 15:003,716 MW3,582 MW
10 Nov, 16:003,834 MW3,710 MW
10 Nov, 17:003,819 MW3,735 MW
10 Nov, 18:003,766 MW3,787 MW
10 Nov, 19:003,706 MW3,747 MW
10 Nov, 20:003,641 MW3,641 MW
10 Nov, 21:003,410 MW3,400 MW
10 Nov, 22:003,194 MW3,192 MW
10 Nov, 23:003,057 MW3,052 MW
11 Nov, 00:002,944 MW3,030 MW
11 Nov, 01:002,858 MW2,948 MW
11 Nov, 02:002,859 MW2,963 MW
11 Nov, 03:002,925 MW2,943 MW
11 Nov, 04:002,977 MW2,998 MW
11 Nov, 05:003,137 MW3,205 MW
11 Nov, 06:003,486 MW3,595 MW
11 Nov, 07:003,663 MW3,725 MW
11 Nov, 08:003,686 MW3,735 MW
11 Nov, 09:003,697 MW3,805 MW
11 Nov, 10:003,607 MW3,663 MW
11 Nov, 11:003,717 MW3,763 MW
11 Nov, 12:003,727 MW3,755 MW
11 Nov, 13:003,738 MW3,718 MW
11 Nov, 14:003,672 MW3,623 MW
11 Nov, 15:003,670 MW3,643 MW
11 Nov, 16:003,792 MW3,825 MW
11 Nov, 17:003,723 MW3,878 MW
11 Nov, 18:003,663 MW3,845 MW
11 Nov, 19:003,660 MW3,815 MW
11 Nov, 20:003,568 MW3,723 MW
11 Nov, 21:003,347 MW3,518 MW
11 Nov, 22:003,154 MW3,305 MW
11 Nov, 23:002,980 MW3,173 MW
12 Nov, 00:002,892 MW2,907 MW
12 Nov, 01:002,837 MW2,824 MW
12 Nov, 02:002,867 MW2,838 MW
12 Nov, 03:002,850 MW2,840 MW
12 Nov, 04:002,880 MW2,926 MW
12 Nov, 05:003,102 MW3,127 MW
12 Nov, 06:003,480 MW3,508 MW
12 Nov, 07:003,643 MW3,672 MW
12 Nov, 08:003,741 MW3,745 MW
12 Nov, 09:003,755 MW3,764 MW
12 Nov, 10:003,681 MW3,657 MW
12 Nov, 11:003,747 MW3,740 MW
12 Nov, 12:003,736 MW3,752 MW
12 Nov, 13:003,692 MW3,744 MW
12 Nov, 14:003,644 MW3,703 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 2026-11-12. 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 2026-11-12. Data from ENTSO-E Transparency Platform.},
  url = {https://worldpowermonitor.com/forecast-accuracy/sk/}
}

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