Battery Storage

Microgrids for Commercial Sites: How They Work and When They Pay Off

Guide · Commercial solar & battery · ~5 min read

A microgrid lets your site generate, store and manage its own power, and keep running when the grid can't. Here's how the pieces fit together and when it stacks up for a commercial operation.

What a microgrid actually is

A microgrid is a self-contained energy system that can run connected to the mains grid or stand on its own when needed. On a commercial site it usually ties together solar generation, battery storage, a smart controller and your existing switchboard, so the whole thing works as one coordinated system rather than a collection of separate bits of kit.

The key word is control. A microgrid decides, moment to moment, where your power comes from and where it goes: straight into the building, into the battery, out to the grid, or held back for later. That coordination is what separates a microgrid from simply having solar panels on the roof.

The core components

Most commercial microgrids are built from the same building blocks, sized to suit the site. At ATI we scale from 6.6kW through to MW, so the same logic applies whether you're running a workshop or a large rooftop like the 415kW system we installed at DB Santasalo in Bulli.

• Generation: rooftop or ground-mount solar as the primary source of on-site power.
• Storage: batteries that soak up excess generation and release it when it's worth more.
• Control system: the brains that monitor loads, tariffs and generation, then make the decisions.
• Grid connection and switchboard: the interface with the mains and your existing electrical infrastructure.
• Optional backup generation for sites that need guaranteed uptime.

How energy arbitrage changes the maths

This is where a modern microgrid starts to earn its place. AI-driven energy arbitrage means the battery charges when power is cheap and discharges, or exports, when it's dear. Instead of just shaving your peak usage, the system actively trades against the price signals in your tariff.

How much that's worth depends heavily on your tariff structure, your network and how your site uses power across the day. For some businesses the arbitrage benefit can be significant; for others the main value is resilience. A site review is the only honest way to tell which camp you're in.

Resilience and keeping the lights on

For many commercial sites, the real driver isn't just the bill, it's what an outage costs. A microgrid can island itself from the grid during a fault or blackout and keep critical loads running on solar and stored energy.

That matters most where downtime is expensive or dangerous: cold storage, manufacturing lines, data-heavy operations, or remote sites with a shaky grid connection. If an hour offline costs you real money, resilience often becomes the deciding factor.

When a microgrid pays off

There's no single answer, but a few patterns tend to make microgrids worthwhile. The stronger these apply to your site, the better the case usually looks.

• You use a lot of power during the day, when solar is generating.
• Your tariff has meaningful price differences across the day that arbitrage can exploit.
• Outages are costly or disruptive to your operation.
• You have roof or ground space available for a worthwhile solar array.
• You're planning to electrify more of your operation and want to control future grid costs.

How ATI approaches it

We're CEC and SAA accredited and run an in-house team Australia-wide, with no subcontractors, so the people who design your microgrid are the people who install and commission it. We've delivered systems across commercial and residential sites, from a Hunter Valley vineyard to projects with Garmin, Goldschmidt and Kingswood.

Every site is different, and the real numbers, on arbitrage, resilience and payback, come out of a proper site review, not a guess. If you'd like to know whether a microgrid stacks up for your operation, get in touch and we'll take a look at your site, loads and tariff.

More: browse all guides · see our projects