Every New Jersey homeowner has a version of the story. The summer thunderstorm that turned into three days of spoiled groceries. The nor'easter that took the heat out with the lights. The sump pump that sat silent while the basement filled. After one of those, the question stops being should we get a generator? and becomes what does it actually take?
Here's the full picture: how whole-house generators work, what they realistically cost in 2026, and what happens between signing the paperwork and hearing that first reassuring self-test hum.
What "whole-house" actually means
A whole-house generator, also called a standby generator, is a permanently installed unit that sits on a pad beside your home, connects to your natural gas line, and starts itself. When the grid fails, an automatic transfer switch detects the outage and shifts your home onto generator power in seconds, whether you're home or not. When the grid returns, it switches back and the generator shuts down.
That automation is the real difference from a portable generator. No wheeling anything out of the garage, no gas cans, no extension cords in the rain. With a natural gas connection, there's no refueling at all, and most of New Jersey's suburban housing stock already has gas service at the street, which is exactly why standby units are so popular here.
Sizing: how big a generator do you need?
Generator capacity is measured in kilowatts (kW), and the right size depends on what you want to keep running:
- Essentials only (roughly 7 to 10 kW): refrigerator, sump pump, some lights and outlets, internet. Keeps the house safe and livable.
- Most of the house (roughly 13 to 20 kW): adds central HVAC, well pump, and the majority of everyday circuits. This range typically covers homes up to about 3,000 square feet.
- Everything, no compromises (22 kW and up): larger homes, multiple AC units, electric appliances all running at once.
A good rule of thumb from our generator installation assessments: total up the wattage you want protected, then add about 10 percent of headroom so the unit never runs at its limit. Undersizing is the most common generator regret, because the day you need it is exactly the day everything runs at once.
What it costs in 2026
Nationally, a whole-house standby generator typically runs $6,000 to $12,000 or more fully installed in 2026, with the equipment itself accounting for roughly $3,000 to $6,000 and installation making up the rest. Where you land in that range depends on a few site-specific factors:
- Unit size. A 22 kW unit costs meaningfully more than a 10 kW unit.
- Gas line work. Distance from your meter to the generator pad, and whether your line needs upsizing.
- Electrical work. The transfer switch installation typically adds several hundred to a couple thousand dollars depending on your panel setup.
- Placement. Pad location, code-required clearances from windows and property lines, and trenching runs.
Budget a bit for upkeep too: annual maintenance typically runs $200 to $650 per year for inspection, oil, and filter service, much like a car.
One number that surprises people pleasantly: running on natural gas, a 20 kW unit consumes roughly $30 to $40 of fuel per day during an outage. Not nothing, but a fraction of what a comparable propane setup burns, and there's never a fuel delivery to schedule.
What installation actually involves
A professional standby generator installation in New Jersey follows a predictable arc:
- Assessment. An evaluation of your electrical loads, gas service, and site to spec the right unit and placement. This is where sizing gets decided with real numbers instead of guesswork.
- Permits. Standby generators require electrical and plumbing/gas permits, plus code-compliant placement. Your installer should handle this paperwork, not you.
- Site prep and placement. A level pad goes in, and the unit is set with proper clearances.
- Connections. The gas line is run and connected, and the automatic transfer switch is wired into your electrical panel.
- Inspection and startup. Municipal inspections sign off, then the system is commissioned and tested under load.
From there, the generator largely takes care of itself. It runs a brief weekly self-test so you know it's ready, and Generac units (the brand we install) include Mobile Link monitoring, which puts the generator's status on your phone the same way a solar app shows production.
The honest word on generators and solar
If you have solar panels, you might wonder whether you even need a generator. The honest answer: they solve different problems, and plenty of NJ homes eventually have both. Standard grid-tied solar shuts off during an outage for safety, batteries cover outages with stored clean energy but have finite capacity, and generators run indefinitely on gas. We compared the two backup paths head-to-head in Standby Generator vs. Solar Battery Backup in NJ, so we'll leave the full debate there.
Frequently asked questions
How much does whole-house generator installation cost?In 2026, most whole-house standby installations land between $6,000 and $12,000 or more all-in, depending on unit size, gas line work, and electrical complexity. A site assessment turns that range into a real number for your home.
What size generator do I need for my house?Roughly 7 to 10 kW covers essentials, 13 to 20 kW handles most homes up to about 3,000 square feet including central air, and 22 kW and up runs larger homes without compromise. Size to your actual loads plus about 10 percent headroom.
Do I need permits to install a generator in NJ?Yes. Electrical and gas permits are required, along with code-compliant placement and municipal inspection. A professional installer manages the entire permitting process.
How long can a whole-house generator run?On natural gas, effectively as long as the outage lasts, since it draws fuel continuously from your gas line. Manufacturers recommend brief shutdowns for oil checks during very extended runs.
Is a standby generator better than a solar battery?They're different tools: batteries provide clean, silent, finite backup, while generators run indefinitely on fuel. Many homes pair them. See our full generator vs. battery comparison for the breakdown.
Ready for the next outage to be a non-event?
Solar Me installs Generac standby generators across New Jersey, backed by 15 years and more than 1,100 completed projects around the state. From load assessment through permits, gas, electrical, and that first test run, one team handles the whole job. Request a free assessment and find out exactly what it takes to keep your house running when the grid doesn't.
