A microgrid is an energy grid that can operate independently of the public electricity supply grid.

In some cases, it may be totally independent of the public grid, in which case it is known as an isolated microgrid, and this situation often arises in remote locations.

Usually, the microgrid is connected to the public grid by means of a PCC (point of common coupling), and can take power from the public grid at times, and at other times may feed power into it. Read the Rest Here