[enlyth]

That's if the price of electricity doesn't change in the next 87 years

The panels are also a hedge against that uncertainty and provide self reliance

[Paradigma11]

The more usage of intermittent renewables increases the more your electricity bill is dominated by fixed costs. You still need the grid, which is only growing more expensive.

[ben_w]

Or batteries, which are also getting cheaper.

For places not already on the grid, using batteries instead of paying for a new grid connection is close enough to be a question worth asking, though from what I've seen not a definite "yes" or "no" in general.