Mismatch

Residual load — the demand left for conventional plants and batteries after wind and solar. It dips midday when solar is abundant and peaks in the evening, when solar fades but people are still home.

Residual load by hour of day — Germany

Residual load = total demand − wind+solar generation. The shaded band is the demand met by wind+solar; its evening collapse is the point. Residual load can go negative when renewables exceed demand. Source: ENTSO-E.

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