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Built 2026-10-28 (28 October 2026)

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

The day-ahead demand forecast for Slovakia was off by 2.1% on average (mean absolute percentage error) over 686 hours from 30 September to 28 October 2026, and 94% of hours landed within 5% of the reading. Its bias was -0.1%: it ran close to balanced on average. The largest miss was 272 MW (9.8%) too high at 25 Oct 2026, 10:00 CET (UTC+01:00). Dates and times are local (Europe/Bratislava).

Key Facts

  • The day-ahead demand forecast for Slovakia was off by 2.1% on average (mean absolute percentage error) over 686 hours from 30 September to 28 October 2026, and 94% of hours landed within 5% of the reading. Its bias was -0.1%: it ran close to balanced on average. The largest miss was 272 MW (9.8%) too high at 25 Oct 2026, 10:00 CET (UTC+01:00).
  • Across 47 European bidding zones ranked by average error over their own latest 30 day windows, Slovakia came 10 (1 is the smallest error).
  • On average the forecast differed from reported demand by 60 MW, against average demand of 2,867 MW.
  • The forecast was above reported demand in 45% of compared hours.

Forecast Error at a Glance

686 hours from 30 September to 28 October 2026
Average error2.1%
Bias-0.1%
Hours within 5%94%
Worst miss272 MW

Average error is the mean absolute percentage gap between the forecast and reported demand. Bias is the signed mean (-4 MW per hour on average): the forecast ran close to balanced on average. The worst miss was 272 MW (9.8%) too high at 25 Oct 2026, 10:00 CET (UTC+01:00): forecast 3,053 MW, reported 2,781 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)
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 28 Oct 2026, 13:00 CET (UTC+01:00). Gaps are hours with a missing, zero or implausible report. 0 1,000 2,000 3,000 4,000 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 Slovakia 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, 15:002,977 MW3,000 MW
21 Oct, 16:003,121 MW3,126 MW
21 Oct, 17:003,236 MW3,232 MW
21 Oct, 18:003,381 MW3,341 MW
21 Oct, 19:003,363 MW3,384 MW
21 Oct, 20:003,237 MW3,305 MW
21 Oct, 21:003,037 MW3,075 MW
21 Oct, 22:002,811 MW2,854 MW
21 Oct, 23:002,688 MW2,716 MW
22 Oct, 00:002,612 MW2,624 MW
22 Oct, 01:002,548 MW2,531 MW
22 Oct, 02:002,532 MW2,515 MW
22 Oct, 03:002,534 MW2,514 MW
22 Oct, 04:002,601 MW2,597 MW
22 Oct, 05:002,800 MW2,810 MW
22 Oct, 06:003,158 MW3,270 MW
22 Oct, 07:003,382 MW3,443 MW
22 Oct, 08:003,530 MW3,499 MW
22 Oct, 09:003,604 MW3,507 MW
22 Oct, 10:003,501 MW3,373 MW
22 Oct, 11:003,536 MW3,385 MW
22 Oct, 12:003,540 MW3,372 MW
22 Oct, 13:003,451 MW3,319 MW
22 Oct, 14:003,295 MW3,255 MW
22 Oct, 15:003,259 MW3,238 MW
22 Oct, 16:003,342 MW3,325 MW
22 Oct, 17:003,393 MW3,384 MW
22 Oct, 18:003,442 MW3,459 MW
22 Oct, 19:003,472 MW3,461 MW
22 Oct, 20:003,365 MW3,373 MW
22 Oct, 21:003,138 MW3,122 MW
22 Oct, 22:002,936 MW2,897 MW
22 Oct, 23:002,818 MW2,752 MW
23 Oct, 00:002,684 MW2,620 MW
23 Oct, 01:002,656 MW2,538 MW
23 Oct, 02:002,644 MW2,511 MW
23 Oct, 03:002,620 MW2,514 MW
23 Oct, 04:002,671 MW2,592 MW
23 Oct, 05:002,853 MW2,744 MW
23 Oct, 06:003,264 MW3,150 MW
23 Oct, 07:003,433 MW3,331 MW
23 Oct, 08:003,451 MW3,366 MW
23 Oct, 09:003,379 MW3,332 MW
23 Oct, 10:003,209 MW3,194 MW
23 Oct, 11:003,228 MW3,199 MW
23 Oct, 12:003,237 MW3,194 MW
23 Oct, 13:003,174 MW3,151 MW
23 Oct, 14:003,130 MW3,066 MW
23 Oct, 15:003,115 MW3,056 MW
23 Oct, 16:003,233 MW3,160 MW
23 Oct, 17:003,312 MW3,235 MW
23 Oct, 18:003,317 MW3,295 MW
23 Oct, 19:003,298 MW3,309 MW
23 Oct, 20:003,245 MW3,232 MW
23 Oct, 21:003,038 MW3,040 MW
23 Oct, 22:002,867 MW2,843 MW
23 Oct, 23:002,733 MW2,712 MW
24 Oct, 00:002,645 MW2,615 MW
24 Oct, 01:002,570 MW2,528 MW
24 Oct, 02:002,514 MW2,535 MW
24 Oct, 03:002,512 MW2,488 MW
24 Oct, 04:002,492 MW2,523 MW
24 Oct, 05:002,520 MW2,560 MW
24 Oct, 06:002,626 MW2,653 MW
24 Oct, 07:002,769 MW2,798 MW
24 Oct, 08:002,947 MW3,050 MW
24 Oct, 09:003,098 MW3,103 MW
24 Oct, 10:003,067 MW3,090 MW
24 Oct, 11:003,136 MW3,090 MW
24 Oct, 12:003,155 MW3,030 MW
24 Oct, 13:003,063 MW2,945 MW
24 Oct, 14:002,971 MW2,878 MW
24 Oct, 15:002,876 MW2,865 MW
24 Oct, 16:002,948 MW2,915 MW
24 Oct, 17:002,966 MW2,918 MW
24 Oct, 18:003,025 MW2,995 MW
24 Oct, 19:003,013 MW3,005 MW
24 Oct, 20:002,940 MW2,950 MW
24 Oct, 21:002,814 MW2,793 MW
24 Oct, 22:002,682 MW2,613 MW
24 Oct, 23:002,558 MW2,450 MW
25 Oct, 00:002,432 MW2,497 MW
25 Oct, 01:002,342 MW2,414 MW
25 Oct, 02:002,303 MW2,379 MW
25 Oct, 02:002,273 MW2,365 MW
25 Oct, 03:002,258 MW2,382 MW
25 Oct, 04:002,304 MW2,446 MW
25 Oct, 05:002,374 MW2,586 MW
25 Oct, 06:002,550 MW2,683 MW
25 Oct, 07:002,676 MW2,849 MW
25 Oct, 08:002,747 MW2,931 MW
25 Oct, 09:002,820 MW3,021 MW
25 Oct, 10:002,781 MW3,053 MW
25 Oct, 11:002,831 MW3,052 MW
25 Oct, 12:002,762 MW2,933 MW
25 Oct, 13:002,741 MW2,904 MW
25 Oct, 14:002,769 MW2,840 MW
25 Oct, 15:002,810 MW2,875 MW
25 Oct, 16:002,950 MW2,993 MW
25 Oct, 17:002,985 MW3,055 MW
25 Oct, 18:003,025 MW3,068 MW
25 Oct, 19:002,974 MW3,023 MW
25 Oct, 20:002,859 MW2,955 MW
25 Oct, 21:002,718 MW2,821 MW
25 Oct, 22:002,602 MW2,748 MW
25 Oct, 23:002,494 MW2,560 MW
26 Oct, 00:002,402 MW2,614 MW
26 Oct, 01:002,304 MW2,475 MW
26 Oct, 02:002,325 MW2,457 MW
26 Oct, 03:002,341 MW2,484 MW
26 Oct, 04:002,440 MW2,629 MW
26 Oct, 05:002,652 MW2,776 MW
26 Oct, 06:003,114 MW3,065 MW
26 Oct, 07:003,289 MW3,259 MW
26 Oct, 08:003,406 MW3,398 MW
26 Oct, 09:003,410 MW3,373 MW
26 Oct, 10:003,326 MW3,210 MW
26 Oct, 11:003,362 MW3,221 MW
26 Oct, 12:003,325 MW3,231 MW
26 Oct, 13:003,355 MW3,174 MW
26 Oct, 14:003,326 MW3,145 MW
26 Oct, 15:003,279 MW3,265 MW
26 Oct, 16:003,396 MW3,387 MW
26 Oct, 17:003,464 MW3,407 MW
26 Oct, 18:003,485 MW3,377 MW
26 Oct, 19:003,476 MW3,294 MW
26 Oct, 20:003,353 MW3,160 MW
26 Oct, 21:003,140 MW3,010 MW
26 Oct, 22:002,920 MW2,776 MW
26 Oct, 23:002,770 MW2,632 MW
27 Oct, 00:002,700 MW2,584 MW
27 Oct, 01:002,628 MW2,524 MW
27 Oct, 02:002,657 MW2,529 MW
27 Oct, 03:002,643 MW2,517 MW
27 Oct, 04:002,732 MW2,583 MW
27 Oct, 05:002,895 MW2,759 MW
27 Oct, 06:003,235 MW3,237 MW
27 Oct, 07:003,394 MW3,394 MW
27 Oct, 08:003,395 MW3,387 MW
27 Oct, 09:003,340 MW3,334 MW
27 Oct, 10:003,143 MW3,188 MW
27 Oct, 11:003,160 MW3,210 MW
27 Oct, 12:003,166 MW3,207 MW
27 Oct, 13:003,127 MW3,224 MW
27 Oct, 14:003,210 MW3,238 MW
27 Oct, 15:003,301 MW3,267 MW
27 Oct, 16:003,424 MW3,419 MW
27 Oct, 17:003,503 MW3,429 MW
27 Oct, 18:003,542 MW3,473 MW
27 Oct, 19:003,517 MW3,389 MW
27 Oct, 20:003,410 MW3,296 MW
27 Oct, 21:003,183 MW3,076 MW
27 Oct, 22:002,959 MW2,900 MW
27 Oct, 23:002,883 MW2,769 MW
28 Oct, 00:002,724 MW2,710 MW
28 Oct, 01:002,672 MW2,598 MW
28 Oct, 02:002,678 MW2,608 MW
28 Oct, 03:002,719 MW2,618 MW
28 Oct, 04:002,788 MW2,713 MW
28 Oct, 05:002,988 MW2,870 MW
28 Oct, 06:003,341 MW3,135 MW
28 Oct, 07:003,481 MW3,308 MW
28 Oct, 08:003,436 MW3,365 MW
28 Oct, 09:003,367 MW3,333 MW
28 Oct, 10:003,196 MW3,190 MW
28 Oct, 11:003,244 MW3,203 MW
28 Oct, 12:003,222 MW3,203 MW
28 Oct, 13:003,151 MW3,190 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). 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 2026-10-28. 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 2026-10-28. Data from ENTSO-E Transparency Platform.},
  url = {https://worldpowermonitor.com/forecast-accuracy/sk/}
}

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