$21/MWh is very cheap energy. Far cheaper than any modern nuclear plant, and significantly cheaper than most fossil-fuelled energy even before you account for carbon/pollution externalities.
I've read that solar panels (I have one for hot water) might lose some efficacy over the decades but even those installed 40 years ago are still working. I guess at some point it will be cost effective to replace them...or if the math works out leave them working at, say, 60% efficiency, and build a new one. It's not like they're running out of sunny places over there.
I've read that solar panels (I have one for hot water) might lose some efficacy over the decades but even those installed 40 years ago are still working. I guess at some point it will be cost effective to replace them...or if the math works out leave them working at, say, 60% efficiency, and build a new one. It's not like they're running out of sunny places over there.