Not really, unless you are just guessing. A quick read shows that solar gained popularity because of an unreliable grid and a removal of subsidies on diesel. Solar ended up being the cheaper and more reliable option. Labor costs for installation are also lower. In remote areas you may not even have a grid option. Simple general assumptions don't hold across vastly different geopolitical circumstances.

Right, so there's still no need for subsidies.

What's needed are Pigouvian CO2 taxes, but those aren't politically feasible.