Solar now being the cheapest energy source made its rounds on Lemmy some weeks ago, if I remember correctly. I just found this graphic and felt it was worth sharing independently.
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As far as I understand the description at the top of the image, no, storage is not included. But if production costs are insanely low, that of course does leave plenty room for storage or redundancy. In particular, personally I believe the costs will continue on a logarithmic drop and we're at the steep part of that, so even if it really is not the case today, I do expect solar production + storage to become cheaper in a not too distant future.
Also, as another graphic from the source article illustrates, battery costs are rapidly dropping, too: