Secondly, our utility grids are weak in many cases.

The two sites can be on separate continents or simply on different utility grids.

Excess energy is sold at a premium to the utility grid or industrial user as green renewable power.

For all its environmental appeal, hooking up to the utility grid can be time-consuming.

The system is connected to the local utility grid.

The day is bright, and the solar panels pump 2,320 watts of surplus energy into the local utility grid.

Some green-built homes do not tap the local utility grid at all.

For instance, utility grids may experience problems that are handled well enough by backup systems to keep the power on.

Solar street lights are independent of the utility grid.

It was originally used to power sites far off the utility grid.