Tesla proved that grid-scale batteries are here, and it's going to be interesting to see the rapid shifts in how new energy projects are developed.
I'm not the biggest fan of Tesla, but they might be the most impressive company of this decade followed closely behind by SpaceX (in a vision for a better future way) for what they've done. If you told me in 2008 that we'd have mass market electric cars and reusable rockets in 2018, I would have asked for some of what you're smoking.