Solar has been at cost parity with nothing since ever.
The valuable feature of electricity isn't in producing it; it's delivering what is demanded at every millisecond of every day, reliably. Solar has never done this with any level of cost competitiveness of other generation sources, except certain extreme applications like space.
We could argue that the "true" cost of those other generation sources aren't accounted for due to negative externalities, but it would be a rather pointless debate since nobody could agree on what those costs are.
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