Interesting series. TL;DR the move towards a world running fully on renewable energy is coming. Fast.
Part 1: Solar http://rameznaam.com/2015/08/10/how-cheap-can-solar-get-very-cheap-indeed/
"If this holds, solar will cost less than half what new coal or natural gas electricity cost"
Part 2: Wind power http://rameznaam.com/2015/08/30/how-steady-can-the-wind-blow/
"Wind is already the cheapest source of electricity in the United States, and could, with these advances, provide half or more of the US’s electricity consumption."
Part 3: Energy Storage http://rameznaam.com/2015/10/14/how-cheap-can-energy-storage-get/
"the world is very much on path to achieving cheap enough storage to allow 24/7 clean energy, and doing so in the next 15-20 years"
Part 4: Renewables http://rameznaam.com/2016/01/31/how-far-can-renewables-go-pretty-darn-far/
"Short version: Storage looks likely to get cheap enough that it will be deployed in large quantities, paving the way for wind and solar."
Part 5: Electric cars http://rameznaam.com/2016/04/12/how-cheap-can-electric-vehicles-get/
"within 20 years, if trends hold, 200-mile-range 4-seater EVs, with awesome acceleration and modern amenities, will be cheaper than the cheapest cars sold in the US today."