I don’t need to tell anyone of the importance of Tesla’s expansion into home battery technology. A home battery lets you store solar energy to use when the sun isn’t shining, which is a really, really major thing in terms of power distribution. As I’ve been pointing out for years, this is the crucial missing link between photovoltaic cells being a rapidly, rapidly cheapening technology with a lot of rollout potential, and photovoltaic cells being the major source for the world’s power. As I predicted in The Week in 2013:

The promising trends in technology and cost suggest much more than renewable energy becoming the fastest growing energy source in the next 30 years. They suggest that renewables will grow to be the number one energy source in the United States and the world in the next 30 or 40 years.

I’d say that that was actually an overly conservative projection…

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