Grid integration has always been the issue.
True but grid stability is even bigger.
The grid has to be balanced, not too much energy and not too little.
If the power demands increase and the capacity is not there you cant simply make the sun brighter or speed up the wind to match the load. Then there is night time lol
The elephant in the room is silicon PV. This is not an energy source, nor is it “renewable”. A slicon PV panel will not generate enough electricity throughout its entire lifetime to produce another one like it. This represents a net loss in energy, not a source of energy. It takes an enormous amount of power to purify silicon so that it becomes photoreactive. Couple that with the average silicon PV panel losing 5% output per year and you have a very expensive recipe for disaster. Some years ago US West hired my company to install PV arrays to serve as backup power for a dozen or so rural cellular telephone sites in Nevada and Arizona. After five years they hired us again to remove all of it. The reasons cited for removal were the amount of time it took to clean the accumulated dust off the panels (deserts are very dusty), lighting transients that took out panels and controllers, hail that took out panels, and the overall loss of output that dropped the supply voltage from the panels below the battery voltage. IOW, they were no longer created a positive electron flow towards the batteries. These were top of the line Bosch panels, not Chinese junk. As a side note, Bosch has since left the industry after loosing billions. Silicon PV is a boondoggle of EPIC proportions.