Key facts
- A microgrid is a self-contained power system that generates, stores, and manages its own electricity for a defined area.
- Microgrids can operate connected to the main utility grid or disconnect entirely (islanding).
- Essential components include local generation (solar, natural gas, fuel cells), energy storage (batteries), and a microgrid controller.
- Key drivers for microgrid adoption are extreme weather, rising electricity costs, and aging grid infrastructure.
- AI data centers, with their significant power demands, are a major catalyst for microgrid development.
- Microgrids and smart grids are increasingly designed to work together for enhanced resilience and grid support.
Microgrids, self-contained power systems that can generate, store, and manage their own electricity, are rapidly gaining prominence. Initially recognized for their resilience during disasters like Hurricane Maria in Puerto Rico, they are now being deployed in diverse settings including military bases, university campuses, and critically, alongside AI data centers that are placing unprecedented strain on existing power grids.
A microgrid operates by generating power locally, often through solar PV, natural gas turbines, or fuel cells, and storing it in batteries to ensure a consistent supply. A sophisticated controller manages these resources, balancing supply and demand, and deciding when to interact with the main utility grid. Crucially, microgrids can disconnect from the main grid, a process called islanding, to maintain power during outages.
The U.S. Department of Energy categorizes microgrids into campus/institutional, community, remote/off-grid, and resilience-focused types, all sharing the common thread of local control and the ability to provide continuous power. This capability is becoming increasingly vital due to factors such as extreme weather events, rising electricity costs, and the aging of traditional power infrastructure.
Examples of advanced microgrid implementation include Marine Corps Air Station Miramar, which can island over 100 mission-critical buildings for extended periods, and UC San Diego, whose microgrid supplies a significant portion of its campus electricity using a mix of generation and storage technologies coordinated by AI.