Microgrid
A localized electrical system, combining on-site generation, such as solar or a generator, with battery storage and control software, capable of disconnecting from the main utility grid and operating independently to keep a facility powered during a grid outage, distinct from a standard standby generator since a microgrid can automatically integrate multiple power sources rather than simply switching to one backup source.
Why it matters
A microgrid's real value is its ability to island, disconnect from the grid and keep running independently, during an outage, which requires the same anti-islanding-related safety coordination as a standalone solar system, but in reverse, the microgrid has to deliberately and safely disconnect and reconnect rather than simply always disconnecting like a typical solar interconnection.
On a real project
A hospital's microgrid combines rooftop solar, battery storage, and a backup generator under a single control system that automatically islands the facility from the utility grid during an outage, then reconnects without manual intervention once utility power is restored.
Who this matters most to
A MEP Engineer designs the microgrid's control sequence and how its combined power sources integrate. A Renewable Energy Project Manager manages the project through the utility approval process a grid-interactive microgrid requires.
Where this goes wrong
A facility's microgrid control system is commissioned without adequately testing its transition back to grid power after an outage ends. During an actual outage recovery, the system fails to synchronize properly with returning utility power, causing a second, avoidable outage as the facility's own equipment protective devices trip in response to the mismatched reconnection.