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I am a retired engineer living in Costa Rica, and in 2016 the country generated more than 98% of its electrical power using renewable sources. In fact the entire country ran 250 days last year without any fossil fuel plants operating. Lots of hydroelectric, geothermal, and wind sources are used, but solar contributes only 0.01% of the total. As an engineer, I have listening to the claims and projections for solar sources for more than 30 years. It still has a long way to go before it is commercially and economically viable. Here is an article about the Costa Rica experience.http://www.ticotimes.net/2016/12/16/renewable-electricity-costa-ricahttp://www.ticotimes.net/2016/12/16/renewable-electricity-costa-rica
The grid is reliable, but we sometimes have outages because there are a lot of trees and the distribution lines are overhead. I don't know the KWh cost comparison, but we have a two bedroom condo with AC we typically run a few hours a day and our monthly electric bill is about $90 to $100 (USD).