the comment that comes to mind is - this is not very hard day to balance the grid - non (wind+solar) demand is almost flat throughout the day. This is a good day, operationally speaking, for baseload plants and, conversely, a terrible one for peakers and mid-load plants, which will not be used - but economically, it's a bad day for both, as prices are going to be baseload prices almost the whole day, ie crappy for producers.

Thinking about this, it looks like you're going 3 kinds of days in the market now:

• days like this one, where renewables displace almost all the variable production capacity (there will be quite a few, given solar's natural production profile, which matches demand quite well over the day - a lot of days from April to October will be like this, and in winter, wind tends to produce more so the seasonal effect will be muted); these days will be easy for the system operationally, but crappy economically for all traditional producers

• days when renewables are so plentiful that even some baseload may need to be switched off - or prices will turn negative and the country will export a lot of cheap power (see my separate comment below on exports); this will be painful for baselaod plants, and horrible for economics of all tradiitonal producers;

• days when you have less renewables, or temporary peaks and troughs; on these days, traditional producers will be needed and prices will be significantly higher; these days will be operationally more complex for the system but economically profitable for the traditional producers - and the only days when peakers and other highly flexible can actually earn money, so the number of such days is going to be critical for their continued viability (and thus their availability to the system);

Wind power