My model actually provides both an upper bound and a lower bound current-day figure (explained in http://blog.zorinaq.com/bitcoin-electricity-consumption/ http:

My model actually provides both an upper bound and a lower bound current-day figure (explained in http://blog.zorinaq.com/bitcoin-electricity-consumption/ http://blog.zorinaq.com/bitcoin-electricity-consumption/) 0.50% is not predicted by my model, but it's just a target that seems plausible if the current growth stays the same.