There are several countries that run near 100% renewable. Most of them are getting their electricity from hydro dams though, rather than solar and wind.
Hydro dams have their own environmental concerns.
Hydro dams have their own environmental concerns.
There is just too much uncertainty in long term seasonal rain fall levels, especially with the effects of climate change as well as El Niño and La Niña cycles. Resulting in low production years.
[1]http://www.sandiegouniontribune.com/business/energy-green/sd... [2] https://www.theguardian.com/world/2017/dec/08/malawi-blackou... [3] https://www.theguardian.com/news/2016/mar/30/weatherwatch-ha...