I'm Getting A Tesla Tesla Energy Tesla Powerwall

Elon Musk Introduces Tesla Energy and the Tesla Powerwall

Here is a great video of Elon making the Tesla announcement regarding the Tesla Powerwall and Tesla Energy.  I believe these will be initially produced at the Tesla Factory in Fremont for a bit and then at the Tesla Gigafactory that is being built outside of Reno Nevada once it is open.

Will you be buying the Tesla Powerwall?  What would it feel like to be off the electrical grid?