This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Deutsch Stromerzeugung Mai. de Deutsch Stromerzeugung Mai MW Solarstrom own Data is from transparency eex one day at time for actual wind solar and MW and then average the quarter hour data for wind and solar to combine it with the MW data and then plotted using Open Office Nuclear is from the previous day data transparency