[kaybe]

If you put it into the net, it has to be consumed somewhere. If there is too much production you have to take plants off the grid, and I think those are not included in the plots.

There is an extensive planning process with weather forecasts and peak consumption predictions (break in the football world cup finals for example) to prevent sudden surprising changes. Different kind of power plants have different timelines that it takes to power them up and down. Small peaks in demand can be covered with gas plants since they are very fast to power up and down, but they are expensive. Coal plants take a day, nuclear - forget it-, and solar and wind can be predicted fairly well with the weather (there are plots about the success of predictions in the pdf), water is fairly stable and biomass behaves like gas. You really only want to produce what is consumed, and then there's export and import. There are charts for that as well.