A solar microgrid is a solar system that can cut itself off from the utility grid and keep running on its own. That is the whole idea. The panels and the battery are the same equipment you would see on any other install. What makes it a microgrid is a defined electrical boundary around your property, plus controls that can open that boundary the moment the grid goes down, keep your power on inside it, and close it back up once the utility company restores service.
That definition is broad enough to cover a shared solar array powering a village with no utility for hundreds of miles, and a single house in Ferndale with panels, a battery, and a transfer switch. Same category, wildly different scale, which is why the word causes so much confusion. For a Michigan property that already has a meter, the useful version of this question is not whether to buy something called a microgrid. It is which of your circuits you want to keep alive when the power goes out, and for how long.
Key Points
- A solar microgrid is defined by a clear electrical boundary and the ability to act as one controllable entity.
- Microgrid and off-grid are not the same thing. Most microgrids stay connected to the utility grid and disconnect on purpose only when they need to.
- The version that applies to most Michigan homes and small businesses is a single-customer microgrid, meaning one property inside the boundary.
- Michigan’s grid reliability has improved more than any other state’s since 2019, which changes the honest argument for building one.
- The practical decision is not whether to buy a microgrid. It is which of your loads you want to keep alive inside the boundary.
What a Solar Microgrid Actually Is
The U.S. Department of Energy defines a microgrid as a group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid, and that can connect and disconnect to run either grid-connected or islanded.
That sentence does a lot of work, so let us pull it apart.
- Loads are the things using electricity: your furnace blower, the walk-in cooler, the lights.
- Distributed energy resources are the things making or storing it: solar panels, a battery, sometimes a generator.
- Clearly defined electrical boundaries means there is a specific, physical line where your system ends and the utility’s system begins, and something at that line can open and close it.
- A single controllable entity means the pieces inside talk to each other and behave as one system rather than a pile of independent equipment.
That last part is what people miss. You can own solar panels and a battery and still not have a microgrid, because nothing is coordinating them or managing that boundary. Add controls that know when to island, what to power, and in what order, and the same hardware becomes one.
Why the Word “Microgrid” Confuses People
The same word covers power to a whole village running on a shared solar array as well a single house with panels, a battery, and an automatic transfer switch. Both fit the definition and are correctly considered microgrids. The scale difference is enormous, and that gap is the source of nearly every misconception about the term.
So when you read an article claiming a solar microgrid costs a certain amount or serves a certain number of households, check which scale it is talking about before you apply any of it to your property.
A Solar Microgrid Is Not the Same as Going Off-Grid
This is the most common mix-up we hear.
Off-Grid
No utility connection at all. No meter, no interconnection agreement, no bill, and no backup when your production runs short. Every kilowatt-hour you use has to come from your own equipment or you go without.
Microgrid
Stays connected to DTE, Consumers Energy, or another local utility company. It buys power when buying makes sense, sends power back under distributed generation billing when that makes sense, and separates from the grid only during an outage before reconnecting on its own.
The ability to disconnect is the point. Actually being disconnected is not.
If you are weighing the connection question itself, that is a separate decision with its own tradeoffs, and we covered it in depth in grid-tied vs. off-grid solar.
What Happens When the Grid Goes Down
Standard grid-tied solar shuts down during an outage without intentional energy storage. This surprises people who assumed panels on the roof meant power during a storm, and the reason is safety: if your system kept pushing electricity onto a line that a lineman believes is dead, someone could get hurt. So inverters are required to detect the loss of the grid and drop off within seconds.
A microgrid handles the same moment differently. Instead of shutting everything down, it opens the boundary, isolating your property from the utility’s lines. Now nothing you generate can back-feed the grid, which satisfies the safety requirement. Inside that boundary, your panels and battery keep running and keep serving whatever loads you put inside it. When the utility restores service, the system verifies the grid is stable and closes the boundary back up.
Same hardware on the roof. Completely different behavior, because of the boundary and the controls.
The Sizes a Solar Microgrid Comes In
The Department of Energy sorts microgrids by what sits inside the boundary. Three categories matter for a Michigan reader, and they scale from smallest to largest.
1
Single-Customer Microgrid
One property inside the boundary. A house in Rochester Hills, a vet clinic in Grand Rapids, a manufacturing building in Warren. This is what nearly everyone asking about a residential or small commercial microgrid actually means, and it is what we build most often.
2
Community Microgrid
Two or more separate properties inside a shared boundary, still sitting within DTE or Consumers Energy territory and joined to the utility at a single point of common coupling. These require utility coordination and are typically driven by a municipality, a campus, or a developer rather than by an individual owner.
3
Remote Microgrid
A shared network serving a community that has no utility grid within reach. Sometimes called a mini-grid. These power islands, remote settlements, and research stations, and they take on the job a utility would normally do, including keeping their own voltage and frequency stable. Michigan’s Lower Peninsula has utility service just about everywhere, so this category almost never describes a property here.
A remote microgrid is considered off-grid, but in a slightly different context. The two terms are not opposites, they measure different things. Off-grid describes whether you have a utility connection. Microgrid describes whether your system has a boundary it can control. A remote community has no connection and no choice about it. A Michigan property with a meter has both, which is why the version that applies to you stays connected and opens its boundary only when it needs to.
Have a Question About Your Setup?
Every property is different, and the right answer depends on your roof, your loads, and where you are in Michigan. Talk it through with our team and get a straight read on your options.
Let’s TalkMichigan-Specific Factors for Microgrids
Solar backup usually gets sold on disaster. Hurricanes, wildfires, a grid buckling in a heat wave. None of that is Michigan, and the real picture here is more interesting.
Michigan’s reliability has genuinely improved, and it has improved fast. Between 2019 and 2024, Michigan cut more annual outage time per customer than any other state in the country, roughly 52 minutes a year. In 2025, DTE Electric reached the top quartile of U.S. utilities for restoring customers across all weather conditions, its first time in more than 20 years, after cutting customer outage minutes about 60 percent compared to 2024. Consumers Energy has posted similar gains.
That trend matters. Improving reliability does not make a microgrid more urgent, and it does not automatically make one worth more than a simpler setup. For plenty of Michigan properties, solar battery storage on its own covers what they actually need, and the added controls and boundary that make a system a true microgrid are not worth the cost. The case for one has to come from your situation rather than from a general sense that the grid is fragile.
What the Reliability Numbers Don’t Cover
Michigan does pay you when an outage runs long. Under state rules, a credit kicks in after 16 hours without power in normal conditions, 48 hours in a bad storm, and 96 hours in a catastrophic one. It is $42 a day. You also qualify if you lose power more than six times in a year.
But a credit is not power. It does not run your sump pump while the basement fills, keep your well going, or hold a cooler at temperature. And four days is a long time to wait in an ice storm, which is when Michigan outages tend to run longest and when your house needs heat most.
That is the real case for a microgrid here. Not that the grid is failing, because it is not. It is that averages do not help you during the hours you actually need power.
Check Your Own ZIP Code
The Michigan Public Service Commission publishes outage data by ZIP code for DTE Electric and Consumers Energy. You can see how often customers in your area lose power, how long they stay out, and how long restoration takes.
Look yours up before you decide anything. If your outages are short and rare, a microgrid is a hard sell and we will say so. If you are on a rural feeder that goes down for days, the numbers will show it.
The Real Question Is What Goes Inside the Boundary
A microgrid is a boundary plus controls. So the decision is not really about buying a microgrid. It is about picking which circuits stay on when the power goes out, and how long they need to last. Answer that and most of the design follows.
Name your critical loads
Start with what actually has to stay on. Not the whole house. In a Michigan home that usually means the furnace blower, the sump pump, the well pump if you have one, the fridge, a few lights, internet, and any medical equipment. In a commercial building it might be refrigeration, servers, security, and one production line rather than the whole plant.
Decide how long they need to run
An hour during a flicker is one kind of system. Three days in a January ice storm is another. Your panels may be under snow and the sun sets at five. Duration drives battery size more than anything else.
Size it from there
Now the math has an answer instead of a guess. Your critical loads, times the hours you want covered, adjusted for what your roof really produces in a Michigan winter. That gives us the battery capacity and the array. Load control matters here too. If the system can shut off non-essential circuits on its own, a smaller battery keeps your critical loads running longer.
Storage handles the energy. A smart panel such as a SPAN electrical panel handles the circuit-level control, deciding what stays on and what drops.
We do not favor one brand. Different properties need different answers, and we would rather size around your loads than sell you whatever we happen to stock.
Does a Solar Microgrid Make Sense for Your Property?
Property Fit
Where a Microgrid Earns Its Cost
It comes down to three things.
What your loads are worth when they stop.
How long your outages actually run.
Whether you wanted solar and storage anyway.
When all three line up, adding microgrid capability is often a small step past a system you already wanted, since you are adding controls and a boundary rather than starting over.
Makes the most sense when
Losing power costs you real money or creates real risk, your area has a history of long outages, and solar and storage were already on the table.
Makes less sense when
Your outages are short and rare, nothing you run is time-sensitive, and a few hours without power is just annoying.
A lot of the Michigan properties we look at do better with a straightforward grid-tied system with battery storage, and we will tell you that.
Businesses have one number homeowners do not: what an hour of downtime costs. A clinic that cancels a day of appointments. A shop that loses a cooler of inventory. A plant that has to restart a process. When you can put a dollar figure on that hour, the decision usually gets easy.
Frequently Asked Questions
No, though a battery is almost always part of one. A battery stores energy. A microgrid is the whole coordinated system, including the boundary that separates you from the utility and the controls that decide when to open it and what to power once it is open. You can have a battery without any of that, and many systems do.
No. That is the off-grid version, and it is a different thing. Nearly every microgrid we build stays interconnected and stays on distributed generation billing. It separates from the utility only during an outage and reconnects automatically once service is stable.
Often, yes. It depends on your existing inverter, your electrical service, and where your critical loads sit in your panel. Some systems accept a battery and the necessary controls with modest changes. Others need the inverter replaced. We can tell you which after looking at the equipment you have.
It works, but it works differently, and the design has to account for that. Production drops in December and January, days are short, and snow cover can take a roof array offline for a stretch. That is exactly why the duration question above matters so much. A system sized for a summer outage is not sized for a January one.
Not necessarily, and many of our customers use solar and storage instead. Solar generators and batteries solve overlapping problems with different tradeoffs around fuel, noise, maintenance, and runtime.
There is no minimum. A single-customer microgrid can cover a handful of circuits in one house. The DOE definition says nothing about size, only about boundaries and control, which is why the same term stretches from one home to an entire substation.
We have been designing solar for Michigan properties since 2010, and we handle the permitting, the interconnection paperwork, and the monitoring afterward. If you want to know what your critical loads would actually require, call us at (313) 960-7900 or ask for a quote and we will work through it with you.
