I'd be all in favor of having solar power sell at the going rate that utilities are paying. But that's not how it works. And that's not how solar advocates want it to work.
[1]: https://www.ise.fraunhofer.de/en/downloads-englisch/pdf-file...
We don't know precisely what effect that will have on the grid utility business, or what effect that will have on overall grid supply price rates. One could argue that grid power should get cheaper... one could argue that there would be a net canceling effect among all the factors involved... or one could much more reasonably say that it's a chaotic system so no outcome is guaranteed.
Disruption!
I imagine hot summer afternoons are a time when factories operate below capacity (or not at all), and people heat their homes less and spend more time outside away from TV, etc.
Where I live, the peak is a winter morning which is windless and therefore particularly cold, at 8:00 (before sunrise). Solar output is zero, wind power output is zero. Everyone turns extra heaters on, puts the kettle on to make a hot cup before taking a warm shower.
When do you think solar power is producing the most electricity? In the afternoon on a hot summer day.
When do you think peak grid electricity usage peaks? In the afternoon on a hot summer day!
Solar power helps get rid of the peak electricity usage problem. If anything, power companies should be paying solar users even more, because they are reducing costs for the power company, not increasing them.