The island will not have to completely depend on its old method of power – a 3MW diesel generator – as a new microgrid will work in tandem with the diesel system, and solar arrays will provide additional backup power.

As we understand it, these are original 100 kWh Powerpacks, not the recently update Powerpack 2.0 offering (full details here) that are rated at 200 kWh – with Gigafactory built inverters that begin shipping in September.

A microgrid, as defined by the U.S. DOE is:

A group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid and that connects and disconnects from such grid to enable it to operate in both grid-connected or island mode.