Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteBackup generators and battery systems help critical facilities keep essential services running when utility power is disrupted, but they do different jobs. A generator makes electricity from fuel; a battery supplies electricity stored earlier. A microgrid can coordinate local resources and disconnect from the main grid so they can serve designated loads during an outage. The right design depends on what must stay on, how long it must operate, and how much interruption sensitive equipment can tolerate.
How do generators, batteries, and microgrids work together?
A facility begins by identifying the operations it must preserve—such as hospital life-safety systems, water treatment, wastewater pumping, or communications—and the electrical loads those operations require. The backup system is then designed around those loads and the facility’s resilience goals, rather than assuming every building system must remain powered.
Generators convert fuel into electricity and can supply power while fuel and equipment remain available. Batteries provide stored electrical energy, so their contribution depends on the energy stored, the ability to recharge, and the loads being served. Some systems combine generators, batteries, and local renewable generation under controls that manage how resources serve selected loads.
A microgrid is an operating architecture, not a synonym for a generator or battery. The U.S. Department of Energy defines microgrids as “localized electric grids that can disconnect from the main grid to operate autonomously.” When utility power fails, island-capable controls separate the local system from the grid, allowing its resources to serve designated loads.
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How the options differ
| Option | What it contributes | Key planning consideration |
|---|---|---|
| Generator | Produces electricity from fuel while operating. | Equipment readiness, fuel storage, and the ability to obtain fuel during an extended outage. |
| Battery energy storage system (BESS) | Supplies stored electrical energy and can be paired with other resources. | Stored energy is finite; performance depends on load, charging, and the system design. |
| Microgrid | Coordinates local resources and can island from the utility grid. | Controls and equipment must support safe separation and operation of the intended loads. |
These options are not mutually exclusive. A facility may use a battery for some needs and a generator for others, with a microgrid controller coordinating resources where the design calls for one. The exact arrangement depends on the site and its required level of resilience.
How should a facility decide what needs backup?
Resilience planning starts with critical functions and the loads that support them. A facility should determine which operations must continue, what equipment powers them, and how much interruption each load can tolerate. That assessment informs the required outage coverage and whether the system must support only critical equipment or a wider share of the facility.
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- Continuity: Identify whether a load can tolerate a brief transfer interruption or requires uninterrupted power.
- Duration: Set the outage coverage objective and consider how fuel resupply or battery recharging would work if the outage lasts longer.
- Failure tolerance: Consider whether essential loads can remain powered if a generator, inverter, control, or other backup component fails.
- Operating burden: Account for maintenance, fuel logistics, and any value the system may provide while the utility grid is operating.
- Grid interaction: Decide whether the facility needs the ability to island, or whether another resilience investment better meets its needs.
Efficiency is part of this assessment: reducing facility demand reduces the energy and backup generation needed to maintain essential functions during an outage. CISA also describes resilient designs that retain power for at least critical equipment if a backup component fails. Onsite fuel storage should be determined by the site’s resilience requirements, not assumed to guarantee a particular runtime.
Does a battery system provide uninterrupted power?
Not necessarily. A BESS should not automatically be treated as an uninterruptible power supply (UPS). CISA’s resilient-power guide assumes a BESS does not provide uninterrupted power to sensitive equipment such as computers unless that capability is explicitly stated. Where even a brief interruption is unacceptable, the facility may need local UPS equipment in addition to its broader backup system.
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A battery’s outage contribution is also limited by its stored energy and the load it serves. Renewable generation paired with storage can help improve resilience and extend fuel supplies over a long outage, but it does not make stored energy unlimited. Generator-based systems likewise depend on equipment readiness and fuel availability.
Why do critical facilities need engineered systems, not just portable generators?
CISA lists portable generators among options that can help key facilities continue operating during power disruptions. That does not establish a consumer portable unit as suitable for a hospital, water utility, large communications site, or other facility-scale critical load. Those sites need a design matched to their electrical loads, transfer and control equipment, continuity requirements, fuel or charging plan, and failure tolerance.
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A generator alone does not ensure uninterrupted service: the facility must also account for equipment condition, fuel storage and delivery, transfer arrangements, controls, and the consequences of component failure. Battery systems and microgrids have their own design requirements. The resilience objective—not the product label—determines whether a given system is suitable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do real resilience projects show?
Georgia community: compare alternatives against local needs
In Voices of Experience: Microgrids for Resiliency, the U.S. Department of Energy describes Georgia Transmission Corporation evaluating options for a rural community with a history of outages on an exposed radial transmission line. The alternatives were continuing with traditional wires, developing solar with battery storage, replacing existing diesel generators with a similar source, or installing two microturbines.
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The example shows why resilience planning compares multiple investments against local reliability, technical, and economic needs. It does not establish that a microgrid—or any one technology—is best for every community.
Puerto Rico: storage and temporary generation served different roles
A U.S. Department of Energy fact sheet reports 430 megawatts of four-hour battery storage as part of Puerto Rico grid-resilience work. It describes the batteries as supporting grid stability and reducing reliance on more expensive backup power. The same fact sheet reports 14 temporary generators with approximately 340 megawatts of total capacity, acquired to address urgent generation shortfalls while repairs were completed. These figures describe that Puerto Rico deployment; they are not design targets or estimates for other facilities.
Quick Recap
What a resilient backup plan must account for
- Which operations and electrical loads are essential during an outage.
- How quickly power must transfer, and whether sensitive devices need a separate UPS.
- How long the facility aims to operate and how fuel, recharging, or renewable generation support that objective.
- Whether critical loads can remain served after a backup component fails.
- How islanding controls and local resources will operate when the utility connection is lost.
- How lower facility demand can reduce the energy and generation needed for essential functions.
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