As unpopular as your comment may be, it is likely correct.

Right now solar is so cheap during the day that they can bid a negative price on the market during the day making sure they are part of the mix. Here is a great article/video on it from Practical Engineer

Obviously solar doesn’t actually cost negative money to run, so this will require them to bid a more realistic price that will, in the long run, facilitate an actual conversion to green energy.