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Technically, a grid is any combination of:
. . . . . . power sources,
. . . . . . power users,
. . . . . . wires to connect them, and
. . . . . . some sort of control system to operate it all.

Microgrid just means a small, freestanding grid.
. . . It can consist of:
. . . . . . several buildings,
. . . . . . one small building (sometimes called a “nanogrid”), or
. . . . . . even one person (a “picogrid”) with a
. . . . . . . . . backpack solar panel,
. . . . . . . . . an iPhone, and
. . . . . . . . . some headphones.

Mmicrogrids are extremely basic,
. . . think of a hospital with a diesel generator in the basement, or
. . . a big industrial facility with a combined-heat-and-power (CHP) facility on site,
. . . that can provide some heat and power during a blackout.

5-25-2018 Source:  What is a #microgrid?