The Future of Solar Energy

The global average power consumption, this is all the energy used in the world, averaged over time is now 19 terawatts. That's about 5%ish of the energy that we're using? It's taken decades to get our first terawatt, our first 5%. How long is it going to take us to get our second? There are different estimates, but some people will say that will happen now only within another couple years.