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Data as of 2026-09-20
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Built 2026-09-21 (21 September 2026)

Switzerland Demand Forecast Accuracy: Error, Bias and Worst Miss, 23 August to 20 September 2026

The day-ahead demand forecast for Switzerland was off by 2.5% on average (mean absolute percentage error) over 686 hours from 23 August to 20 September 2026, and 85% of hours landed within 5% of the reading. Its bias was +0.1%: it ran close to balanced on average. The largest miss was 1,555 MW (20.7%) too low at 25 Aug 2026, 07:00 CEST (UTC+02:00). Dates and times are local (Europe/Zurich).

Key Facts

  • The day-ahead demand forecast for Switzerland was off by 2.5% on average (mean absolute percentage error) over 686 hours from 23 August to 20 September 2026, and 85% of hours landed within 5% of the reading. Its bias was +0.1%: it ran close to balanced on average. The largest miss was 1,555 MW (20.7%) too low at 25 Aug 2026, 07:00 CEST (UTC+02:00).
  • Across 47 European bidding zones ranked by average error over their own latest 30 day windows, Switzerland came 13 (1 is the smallest error).
  • On average the forecast differed from reported demand by 171 MW, against average demand of 6,674 MW.
  • The forecast was above reported demand in 51% of compared hours.

Forecast Error at a Glance

686 hours from 23 August to 20 September 2026
Average error2.5%
Bias+0.1%
Hours within 5%85%
Worst miss1,555 MW

Average error is the mean absolute percentage gap between the forecast and reported demand. Bias is the signed mean (+2 MW per hour on average): the forecast ran close to balanced on average. The worst miss was 1,555 MW (20.7%) too low at 25 Aug 2026, 07:00 CEST (UTC+02:00): forecast 5,967 MW, reported 7,521 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 2026-09-20. 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 20 Sept 2026, 13:00 CEST (UTC+02:00)
Switzerland day-ahead demand forecast and reported demand by hour Hourly reported demand and the day-ahead forecast for Switzerland over the last 7 days of the window, to 20 Sept 2026, 13:00 CEST (UTC+02:00). Gaps are hours with a missing, zero or implausible report. 0 2,500 5,000 7,500 10,000 13 Sept, 14:0014 Sept, 14:0015 Sept, 14:0016 Sept, 14:0017 Sept, 14:0018 Sept, 14:0019 Sept, 14:00
Hourly reported demand and the day-ahead forecast for Switzerland over the last 7 days of the window, to 20 Sept 2026, 13:00 CEST (UTC+02:00). Gaps are hours with a missing, zero or implausible report.
Data to 2026-09-20
Switzerland day-ahead demand forecast and reported demand by hour
Local hourReported demandDay-ahead forecast
13 Sept, 14:006,475 MW6,550 MW
13 Sept, 15:005,754 MW5,688 MW
13 Sept, 16:005,451 MW5,448 MW
13 Sept, 17:005,812 MW5,816 MW
13 Sept, 18:006,452 MW6,478 MW
13 Sept, 19:006,435 MW6,440 MW
13 Sept, 20:006,441 MW6,009 MW
13 Sept, 21:006,080 MW6,691 MW
13 Sept, 22:006,463 MW6,673 MW
13 Sept, 23:006,800 MW7,434 MW
14 Sept, 00:006,869 MW6,847 MW
14 Sept, 01:005,295 MW5,295 MW
14 Sept, 02:005,558 MW5,553 MW
14 Sept, 03:005,857 MW5,862 MW
14 Sept, 04:005,454 MW5,459 MW
14 Sept, 05:006,294 MW6,286 MW
14 Sept, 06:007,412 MW7,401 MW
14 Sept, 07:007,439 MW7,307 MW
14 Sept, 08:007,017 MW7,010 MW
14 Sept, 09:007,336 MW7,344 MW
14 Sept, 10:007,857 MW7,855 MW
14 Sept, 11:007,877 MW7,878 MW
14 Sept, 12:006,757 MW6,755 MW
14 Sept, 13:007,198 MW7,055 MW
14 Sept, 14:006,943 MW6,920 MW
14 Sept, 15:006,799 MW7,044 MW
14 Sept, 16:007,142 MW7,128 MW
14 Sept, 17:006,903 MW6,786 MW
14 Sept, 18:006,909 MW7,216 MW
14 Sept, 19:007,665 MW8,021 MW
14 Sept, 20:007,000 MW6,358 MW
14 Sept, 21:007,040 MW7,053 MW
14 Sept, 22:006,885 MW6,875 MW
14 Sept, 23:006,446 MW6,485 MW
15 Sept, 00:006,190 MW6,190 MW
15 Sept, 01:006,771 MW6,776 MW
15 Sept, 02:006,587 MW6,596 MW
15 Sept, 03:005,789 MW5,765 MW
15 Sept, 04:005,937 MW5,826 MW
15 Sept, 05:006,429 MW6,394 MW
15 Sept, 06:007,469 MW8,017 MW
15 Sept, 07:007,051 MW6,938 MW
15 Sept, 08:006,991 MW6,977 MW
15 Sept, 09:007,752 MW7,379 MW
15 Sept, 10:006,910 MW6,906 MW
15 Sept, 11:006,659 MW6,716 MW
15 Sept, 12:007,157 MW7,170 MW
15 Sept, 13:007,112 MW7,100 MW
15 Sept, 14:007,101 MW7,104 MW
15 Sept, 15:007,101 MW7,104 MW
15 Sept, 16:007,107 MW7,110 MW
15 Sept, 17:007,087 MW7,068 MW
15 Sept, 18:007,745 MW7,103 MW
15 Sept, 19:007,187 MW7,258 MW
15 Sept, 20:006,774 MW6,857 MW
15 Sept, 21:007,062 MW7,061 MW
15 Sept, 22:006,251 MW6,329 MW
15 Sept, 23:006,284 MW6,365 MW
16 Sept, 00:006,099 MW6,098 MW
16 Sept, 01:005,893 MW5,900 MW
16 Sept, 02:005,940 MW5,950 MW
16 Sept, 03:005,905 MW5,880 MW
16 Sept, 04:005,837 MW5,759 MW
16 Sept, 05:006,151 MW6,223 MW
16 Sept, 06:007,670 MW8,141 MW
16 Sept, 07:007,398 MW7,516 MW
16 Sept, 08:007,534 MW7,483 MW
16 Sept, 09:007,161 MW7,263 MW
16 Sept, 10:007,312 MW6,989 MW
16 Sept, 11:007,984 MW7,949 MW
16 Sept, 12:006,857 MW6,864 MW
16 Sept, 13:007,053 MW7,011 MW
16 Sept, 14:006,913 MW6,875 MW
16 Sept, 15:008,406 MW8,149 MW
16 Sept, 16:007,148 MW7,141 MW
16 Sept, 17:007,762 MW7,593 MW
16 Sept, 18:007,134 MW7,223 MW
16 Sept, 19:007,428 MW7,429 MW
16 Sept, 20:007,718 MW7,564 MW
16 Sept, 21:007,572 MW7,583 MW
16 Sept, 22:006,718 MW6,586 MW
16 Sept, 23:006,246 MW6,261 MW
17 Sept, 00:006,101 MW6,107 MW
17 Sept, 01:006,666 MW6,666 MW
17 Sept, 02:005,960 MW5,972 MW
17 Sept, 03:005,982 MW5,980 MW
17 Sept, 04:005,832 MW5,901 MW
17 Sept, 05:006,019 MW6,044 MW
17 Sept, 06:006,709 MW7,136 MW
17 Sept, 07:007,500 MW7,450 MW
17 Sept, 08:007,568 MW7,165 MW
17 Sept, 09:007,004 MW6,626 MW
17 Sept, 10:007,047 MW7,096 MW
17 Sept, 11:006,805 MW6,870 MW
17 Sept, 12:007,136 MW6,968 MW
17 Sept, 13:007,359 MW7,282 MW
17 Sept, 14:006,984 MW6,802 MW
17 Sept, 15:006,874 MW6,850 MW
17 Sept, 16:007,125 MW7,180 MW
17 Sept, 17:007,244 MW7,485 MW
17 Sept, 18:006,787 MW6,539 MW
17 Sept, 19:007,224 MW7,233 MW
17 Sept, 20:007,487 MW7,642 MW
17 Sept, 21:006,993 MW6,697 MW
17 Sept, 22:006,126 MW5,821 MW
17 Sept, 23:006,161 MW6,256 MW
18 Sept, 00:006,061 MW6,130 MW
18 Sept, 01:006,148 MW6,243 MW
18 Sept, 02:006,347 MW6,216 MW
18 Sept, 03:006,668 MW6,455 MW
18 Sept, 04:006,517 MW6,462 MW
18 Sept, 05:006,017 MW5,898 MW
18 Sept, 06:007,256 MW7,207 MW
18 Sept, 07:007,011 MW6,585 MW
18 Sept, 08:007,303 MW7,382 MW
18 Sept, 09:007,674 MW7,530 MW
18 Sept, 10:007,344 MW7,051 MW
18 Sept, 11:007,103 MW7,396 MW
18 Sept, 12:007,926 MW8,026 MW
18 Sept, 13:006,751 MW6,749 MW
18 Sept, 14:006,935 MW6,942 MW
18 Sept, 15:006,997 MW7,003 MW
18 Sept, 16:007,017 MW7,012 MW
18 Sept, 17:007,637 MW7,612 MW
18 Sept, 18:007,613 MW8,121 MW
18 Sept, 19:007,390 MW7,560 MW
18 Sept, 20:007,127 MW7,887 MW
18 Sept, 21:007,085 MW6,352 MW
18 Sept, 22:006,216 MW5,741 MW
18 Sept, 23:006,658 MW6,368 MW
19 Sept, 00:006,537 MW6,527 MW
19 Sept, 01:005,481 MW5,401 MW
19 Sept, 02:006,383 MW6,182 MW
19 Sept, 03:006,120 MW6,103 MW
19 Sept, 04:006,311 MW6,254 MW
19 Sept, 05:007,510 MW7,283 MW
19 Sept, 06:006,035 MW5,938 MW
19 Sept, 07:005,613 MW6,790 MW
19 Sept, 08:006,313 MW7,456 MW
19 Sept, 09:005,807 MW7,122 MW
19 Sept, 10:006,921 MW8,085 MW
19 Sept, 11:006,658 MW6,670 MW
19 Sept, 12:006,610 MW6,608 MW
19 Sept, 13:006,044 MW6,121 MW
19 Sept, 14:007,759 MW7,581 MW
19 Sept, 15:007,572 MW7,402 MW
19 Sept, 16:006,358 MW6,323 MW
19 Sept, 17:007,064 MW6,599 MW
19 Sept, 18:005,887 MW5,943 MW
19 Sept, 19:006,048 MW6,049 MW
19 Sept, 20:006,703 MW6,247 MW
19 Sept, 21:007,021 MW6,311 MW
19 Sept, 22:006,453 MW5,894 MW
19 Sept, 23:007,436 MW7,440 MW
20 Sept, 00:005,881 MW5,880 MW
20 Sept, 01:007,225 MW7,225 MW
20 Sept, 02:006,982 MW7,013 MW
20 Sept, 03:006,056 MW6,067 MW
20 Sept, 04:005,682 MW5,697 MW
20 Sept, 05:005,717 MW5,718 MW
20 Sept, 06:007,212 MW6,357 MW
20 Sept, 07:007,169 MW6,726 MW
20 Sept, 08:005,695 MW6,218 MW
20 Sept, 09:006,248 MW5,667 MW
20 Sept, 10:007,186 MW7,453 MW
20 Sept, 11:006,968 MW7,094 MW
20 Sept, 12:006,246 MW6,224 MW
20 Sept, 13:005,971 MW5,975 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.