Hmm.... How did we get started on this topic... Oh yes, that's right: Presumably that 'spare solar power generation' is energy that would otherwise be pissed away doing nothing. If one dude can use the excess solar power they're generating to possibly make a few quid, how is that in any way a problem? Our ability to capture solar energy isn't "pitiful", far from it - we're actually not far off the theoretical efficiency limits of 'traditional' photovoltaic technology. A bigger problem for renewable energy is storing the energy generated, but our battery technology is getting better all the time and there are ways of capturing and storing energy that don't require environmentally problematic rare metal mining. The roadblocks to mass global adoption of renewable energy aren't technological or scientific, the roadblocks are driven by politics and profit.