Interesting post from the great blog Construction Physics   on the evolution of solar energy cost in the last 20 years, and what that means for solar’s role as an alternative way of powering your home.

An interesting point is that the cost of powering your home doesn’t increase linearly with the % of solar used in your electricity mix. If you target to use solar for 90% of your electricity, it will cost you much more than 2x the cost of targeting to use solar for 45% of your electricity. This is because you need to either overbuild capacity or provide extra storage to cover times of lower solar yield.

However, if the cost of PV modules (and ideally installation) keeps decreasing at a similar pace, this becomes less and less of an issue.