Standby Generator Cost in Maine (2026): Whole-Home Backup Pricing

When a Maine ice storm or nor’easter knocks out the power for hours — or days — a standby generator is the difference between a minor inconvenience and frozen pipes, a flooded basement, and spoiled food. So what does a whole-home standby generator cost in Maine in 2026, and what are you actually paying for? Here is a clear breakdown from a licensed Maine electrician who installs them.

What does a standby generator cost in Maine?

A standby generator is an automatic system that turns on by itself when the power fails. Installed cost depends mostly on how much of your home you want to back up. Typical 2026 ranges, including the automatic transfer switch and installation:

System size	What it powers	Typical installed cost
Essential circuits (~10–14 kW)	Heat, well pump, fridge, key circuits	$7,000 – $12,000
Whole-home (18–26 kW)	Most or all of the home	$12,000 – $18,000
Large whole-home (26 kW+)	Larger homes, full load	$16,000 – $22,000+

A free assessment and load calculation is the only way to get a firm number, because it depends on your home’s electrical load and fuel setup.

What is included in the price

• The generator (Generac, Kohler, or Briggs & Stratton)
• An automatic transfer switch — the device that safely switches your home to generator power and back
• The electrical work — connecting the generator and transfer switch to your panel
• The fuel hookup — natural gas or propane
• The pad, permit, and inspection

What size generator do you need?

This is the biggest cost lever. An essential-circuits system covers the things that matter most in an outage — heat, the well pump, refrigeration, and a few key circuits — at a lower cost. A whole-home system runs everything, including central air and larger appliances. For many Maine homes, especially those on well water, an essential-circuits system is the sweet spot. We run a load calculation and walk you through the trade-offs.

Natural gas vs. propane

Most standby generators run on natural gas or propane. If you have a natural gas line, that is usually the simplest and provides effectively unlimited run time. If not, propane is the common choice in Maine, and run time depends on your tank size. We will recommend the best option for your property and handle the hookup.

Why the electrical matters (and why one team helps)

A standby generator is as much an electrical project as a mechanical one — the automatic transfer switch and panel integration have to be done correctly and to code, or the system will not switch over safely. Because MC Electric is a licensed electrical contractor, we handle the whole installation end to end, and we can pair it with a panel upgrade if your service needs it — one team, one quote, no coordinating contractors.

Frequently Asked Questions

How much does a whole-home generator cost installed in Maine?

A whole-home standby generator typically runs $12,000–$18,000 installed, including the automatic transfer switch, electrical, and fuel hookup. Essential-circuit systems start lower, around $7,000–$12,000.

Does a standby generator turn on automatically?

Yes. With an automatic transfer switch, the generator detects the outage, starts on its own, and restores power in seconds — even when you are not home.

How long can a standby generator run?

On natural gas, essentially as long as the outage lasts. On propane, it depends on your tank size. Either way, it runs far longer and more conveniently than a portable generator.

Where does the generator get installed?

It sits outside on a pad, similar to an AC condenser, a safe distance from the house. We identify the best location during your free assessment based on your panel, fuel source, and local code.

Get an upfront price for backup power

We will run a load calculation, recommend the right size, and give you a firm, upfront price — transfer switch, electrical, and fuel hookup included. Request a free estimate or learn more about our standby generator installation across Central Maine and the Kennebec Valley.

Price ranges are 2026 estimates for general budgeting and vary by home and fuel setup; contact us for a firm quote.