---
title: "Do you need a microgrid? Islanding and resilience | Entogo"
description: "A microgrid lets a site keep critical loads running through an outage by islanding onto local storage and generation. It makes sense where outage cost is…"
url: https://entogo.ca/insights/when-does-a-commercial-microgrid-make-sense/
lang: en
type: article
image: https://entogo.ca/_astro/when-does-a-commercial-microgrid-make-sense.B-97B3Ig.jpg
datePublished: 2026-07-17
dateModified: 2026-07-17
site: https://entogo.ca/
llms: https://entogo.ca/llms.txt
---

Home › Insights › Do you need a microgrid? Islanding, resilience, and what to specify

Microgrids

# Do you need a microgrid? Islanding, resilience, and what to specify

Entogo July 17, 2026

![Commercial and industrial rooftop solar with battery energy storage forming a microgrid](https://entogo.ca/_astro/when-does-a-commercial-microgrid-make-sense.B-97B3Ig_ZE6KsT.webp)

In short

A microgrid lets a site keep critical loads running through an outage by islanding onto local storage and generation. It makes sense where outage cost is high or grid capacity is constrained, and it requires grid-forming inverters, a microgrid controller, and utility-approved protection.

## What problem does a microgrid actually solve?

A **microgrid** is a local group of electrical loads and on-site generation — typically solar, battery storage, and sometimes a generator — that can operate connected to the utility grid or disconnect and run on its own. That second mode, called **islanding**, is the reason most sites consider one.

The case starts with the cost of an outage. U.S. electricity customers averaged about five and one-half hours of interruptions in 2022, and the duration has held around two hours a year once major events are excluded. For an office that is an inconvenience; for a data center, cold-storage warehouse, hospital, or continuous-process plant, even a short interruption can mean spoiled product, lost production, or a safety event. A microgrid is a way to decouple a site’s critical loads from grid reliability.

A second driver is capacity. Where a utility cannot deliver additional service quickly, adding local generation and storage behind the meter can free up headroom for new load — an EV depot, an added production line, or a building expansion — without waiting on a full service upgrade. In both cases the microgrid is infrastructure, not a gadget.

## How a microgrid works — grid-connected, islanded, and the transition

The hard engineering in a microgrid is not the batteries or the panels; it is the transition between operating modes and holding the island stable once separated.

### Grid-forming vs grid-following inverters

Ordinary grid-tied inverters are **grid-following**: they synchronize to the grid’s existing voltage and frequency and inject current. Remove the grid and they have nothing to follow, so they shut down. Islanding requires at least one **grid-forming** source that actively establishes voltage and frequency as the reference for everything else on the island. On a battery-based microgrid, that role falls to a grid-forming inverter such as a [DC-coupled grid-forming hybrid system](https://entogo.ca/products/dc-coupled-grid-forming-hybrid-system), paired with a [battery energy storage system](https://entogo.ca/products/battery-energy-storage-system) sized to carry the critical load through the outage window.

| Attribute | Grid-following inverter | Grid-forming inverter |
| --- | --- | --- |
| Voltage and frequency | Follows the grid | Establishes its own |
| When the grid is lost | Shuts down | Continues, holds the island |
| Role in a microgrid | Supporting source | Islanding leader |
| Typical use | Standard grid-tied PV and storage | Backup and islanded operation |

### The microgrid controller

Above the inverters sits a **microgrid controller**. **IEEE 2030.7-2017** specifies the microgrid energy management functions common to all microgrids regardless of topology or jurisdiction — coordinating on-site resources and executing the seamless transition between grid-connected and islanded operation. Its companion, **IEEE 2030.8-2018**, defines how those controllers are tested. The controller decides which sources run, sheds non-critical load if generation falls short, and re-synchronizes to the utility before reconnecting.

## Where a microgrid makes sense

A microgrid is rarely the cheapest way to add power, so it earns its place where reliability or capacity has real value:

- **High outage cost** — data centers, healthcare, cold storage, water treatment, and continuous manufacturing.
- **Weak or constrained grid** — sites at the end of a long feeder, or where a utility upgrade is slow or expensive.
- **On-site renewables already present** — a [commercial and industrial storage](https://entogo.ca/solutions/commercial-industrial-storage) or [solar-storage-charging](https://entogo.ca/solutions/solar-storage-charging) installation is already most of the hardware; islanding controls turn it into a microgrid.
- **Demand and rate management** — while grid-connected, the same storage cuts demand charges and shifts energy, so the asset earns its keep every day, not only during outages.

Where the only requirement is short-duration backup for a handful of circuits, a transfer switch and generator may be enough. The microgrid case strengthens as the required runtime, the share of critical load, and the value of clean or quiet operation all rise.

## What a buyer should specify

### Islanding, protection, and interconnection

The **point of common coupling** needs protection and controls the utility will accept. Under **IEEE 1547**, a grid-connected resource must detect an unintentional island and cease to energize the grid within two seconds, so intentional islanding has to be a deliberately engineered, utility-approved scheme — not simply leaving inverters online when the grid drops. Specify the interconnection point, the islanding and reconnection logic, and the protection coordination up front. This is where a [renewable grid connection](https://entogo.ca/solutions/renewable-grid-connection) scope and equipment such as a [new-energy grid-connection cabinet](https://entogo.ca/products/new-energy-grid-connection-cabinet) and [metal-clad switchgear](https://entogo.ca/products/metal-clad-switchgear) come together.

### Standards, sizing, and safety

Inverters should be **designed and built to UL 1741** for their grid-support functions, storage should follow **NFPA 855** and **UL 9540A** for fire safety, and interconnection should be governed by **IEEE 1547**. Size the battery to the critical-load profile and the required islanded runtime, not to a round nameplate number. For larger sites, a [large-scale grid-connected and off-grid system](https://entogo.ca/products/large-scale-mw-grid-connected-off-grid-system) or a [containerized battery energy storage system](https://entogo.ca/products/containerized-battery-energy-storage-system) packages the storage, power conversion, and controls as a coordinated block.

## Bringing it together

A microgrid is a systems problem — storage, grid-forming conversion, switchgear, protection, and controls that must behave as one during the fraction of a second the utility disappears. Entogo builds these components in its own vertically integrated factory and supplies them as an engineered package, designed and built to the governing IEEE, UL, and NFPA standards and UL (cULus) or CSA certifiable on request, so a [utility](https://entogo.ca/solutions/utilities) or commercial buyer can specify one coordinated system rather than integrating parts from a dozen vendors. Because the equipment is manufactured in-house with scalable capacity, delivery avoids the long queues common to today’s transformer and switchgear market. To scope a site, start at [/contact](https://entogo.ca/contact).

- Microgrids
- Energy Storage
- Renewable Grid Connection
- Resilience
- Commercial & Industrial

Glossary: [Grid-forming vs. grid-following inverter](https://entogo.ca/glossary#grid-forming-vs-grid-following) [Battery energy storage system](https://entogo.ca/glossary#bess) [Metal-clad switchgear](https://entogo.ca/glossary#metal-clad-switchgear) [NFPA 855](https://entogo.ca/glossary#nfpa-855)

FAQ

## Common questions

- **What is a microgrid**: A microgrid is a local group of loads and generation that can run connected to the utility or disconnect and run on its own during an outage.
- **When does a microgrid make sense for a business**: When outage cost is high, backup runtime needs are long, or utility capacity is constrained and adding local storage and generation is faster than a service upgrade.
- **What is the difference between a microgrid and a backup generator**: A generator only powers loads during an outage, while a microgrid islands seamlessly, runs on storage and renewables, and also cuts costs while grid-connected.
- **Do microgrids need special inverters**: Yes. Islanding needs grid-forming inverters that set voltage and frequency, plus a microgrid controller and protection coordination that grid-following inverters alone cannot provide.
- **What standards apply to microgrids in North America**: IEEE 2030.7 and 2030.8 cover microgrid controllers, IEEE 1547 governs interconnection, UL 1741 covers inverters, and NFPA 855 covers battery storage safety.

Keep reading

## Related insights

[![Commercial battery energy storage system connected to the grid through inverters](https://entogo.ca/_astro/grid-forming-vs-grid-following-inverters-battery-storage.bidzTJDu_Z16fCm6.webp) Energy Storage ### Grid-forming vs. grid-following inverters for battery storage Grid-following inverters follow an existing grid voltage, while grid-forming inverters set their own voltage and frequency so they can ride through weak grids, island, and black-start. Here is how to tell which one a battery storage project needs and what to specify. View](https://entogo.ca/insights/grid-forming-vs-grid-following-inverters-battery-storage)[![Commercial battery energy storage system paired with rooftop solar at an industrial site](https://entogo.ca/_astro/lfp-vs-nmc-batteries-stationary-storage.D4PePhC4_Z1DbUzj.webp) Energy Storage ### LFP vs. NMC batteries for stationary storage: how to choose LFP and NMC are the two lithium-ion chemistries behind most stationary storage. LFP leads on cycle life, thermal stability and cost per kWh; NMC packs more energy into less space. Here is how to match chemistry to a project. View](https://entogo.ca/insights/lfp-vs-nmc-batteries-stationary-storage)[![Commercial battery energy storage enclosures with rooftop solar showing thermal management for a BESS installation](https://entogo.ca/_astro/air-cooled-vs-liquid-cooled-battery-storage.CNRAR2SV_2b73rb.webp) Energy Storage ### Air-cooled vs. liquid-cooled battery storage: how to choose Battery cells age faster when they run hot, so a BESS cooling architecture largely decides its lifespan and footprint. Air cooling is simpler and cheaper; liquid cooling holds tighter temperatures for dense, high-throughput sites. Here is how to choose. View](https://entogo.ca/insights/air-cooled-vs-liquid-cooled-battery-storage)

Project inquiry

## Turn the brief into a specified system.

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