This page shows daily plots of forecast grid data for solar photovoltaic energy in Belgium, year 2021. We use quarter hour forecast data from Elia, which is corrected with up-scaled measurement data for the monitored capacity. The monitored capacity can deviate from the installed capacity; and it can change over time. Therefore values normalized to kWh/day per kWpeak, and also hourly fluctuations are provided. In general grid forecast data is more accurate than weather re-analysis from satellite data.

solar	2021	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Monitored capacity (GWpeak)	4.79	4.79	4.79	4.79	4.79	4.79	4.79	4.79	4.79	4.79	4.79	4.79	4.79
Cumulative energy (GWh)	4678	86.3	300	745	1342	1972	2626	3223	3740	4215	4489	4614	4678
Monthly energy (GWh)	4678	86.3	214	445	596	630	655	597	517	475	274	125	63.6
Normalized cumulative sum (kWh/kWpeak)	977	18.0	62.7	156	280	412	549	673	781	880	938	964	977
Normalized monthly energy (kWh/kWpeak)	977	18.0	44.7	92.9	125	132	137	125	108	99.3	57.2	26.1	13.3
Normalized cumulative distribution [%]	100 %	1.85 %	6.42 %	15.9 %	28.7 %	42.1 %	56.1 %	68.9 %	79.9 %	90.1 %	96.0 %	98.6 %	100 %
Normalized monthly distribution [%]	100 %	1.85 %	4.57 %	9.51 %	12.8 %	13.5 %	14.0 %	12.8 %	11.1 %	10.2 %	5.86 %	2.68 %	1.36 %
Capacity factor [%]	11.2 %	2.42 %	6.65 %	12.5 %	17.3 %	17.7 %	19.0 %	16.7 %	14.5 %	13.8 %	7.68 %	3.63 %	1.78 %

Average hourly data:
The plots below show hourly data, normalized to kiloWatt per installed capacity expressed in kiloWatt peak. The Elia grid data contains four data points per hour, these are averaged to represent a single hour on the plot. So the hour 14 combines data points from 14:00, 14:15, 14:30 and 14:45 for example. In the legend we display the avarage daily generated energy in kWhpeak per month. The maximum achievable energy per day is 24 kWh per kWpeak of installed capacity, since there are 24 hours in a day. Fluctuations are summarized with boxplots for the entire year and per month.

Acknowledgement: many thanks to Elia for open access to solar grid data of Belgium at www.elia.be/en/grid-data. This data is licensed under the Elia Open Data License, which uses the CC BY-4.0 public license, and is governed by Belgian law.

User guide: most of the figures on this page are dynamic boxplots. A png image can be downloaded with the pop-up window at the right upper side. These functions require that javascript is enabled. Boxplots are explained here.