Whole house generator cost in New Jersey, 2026: what a Generac costs installed

02 / Price by kW

Generac list prices by size, with and without the transfer switch.

Generac publishes a manufacturer's suggested retail price on every home standby product page. The current air-cooled range comes in each size as a generator alone or as a bundle with a 200-amp, service-rated automatic transfer switch. The kilowatt ratings below come from Generac's spec sheets, which rate every size except the 14 kW lower on natural gas than on propane. West Orange and Montclair are in PSE&G's gas territory, so for a house with gas service the second rating is the one to size against.

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Retail prices can sit below list. On the same day, Home Depot listed the 22 kW bundle (7325) at $7,229 and Lowe's showed it at $6,506.10; we could not confirm whether the Lowe's figure was a temporary sale. Generac still sells its earlier Wi-Fi range alongside the current one: the familiar 22 kW model 7043 with a 200-amp smart switch lists at $6,979, and Home Depot showed it at $6,839.

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List prices are the manufacturers' own published figures and exclude installation. Kohler's 26RCA page contradicts itself on whether the switch is included; its spec sheet places the 200-amp switch in the 26RCAL package, which is what the table shows. Lowe's listed the Cummins RS20A at $6,093.78.

03 / What installed includes

Published installed ranges disagree because they are not pricing the same job.

Every major cost site publishes an installed range, and they spread from about $1,500 to $25,000. That is not because one is right and the rest are wrong. They mix partial-house and whole-house units, propane and natural gas, short and long gas runs, and new electrical service work in different proportions. Read each range as that source's own number for that source's own mix of jobs.

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One quick test separates the ranges that describe a whole-house job from the ones that do not. Angi's $5,158 national average is lower than the list price of Generac's own 22 kW bundle, so its project mix either includes smaller or partial-house systems or leaves out part of the equipment. For a 20 kW-plus whole-house install on natural gas, the relevant bands are Generac's $8,000 to $16,000 and HomeGuide's $9,500 to $24,000 for larger or longer-run jobs.

The line items a New Jersey installed price has to carry

The table below lists every item that belongs in a written New Jersey proposal, what it involves here, and the cost figures that public sources publish for it. A blank line on a proposal is not free work; it is scope nobody has priced yet.

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Where the unit can sit on a North Jersey lot

Placement drives the gas-line length, the wire run, and whether the town will approve the spot, so it drives cost. Generac's April 2026 installation manual for its 10 to 28 kW air-cooled units requires 3 feet of clearance at the front and ends, 18 inches at the rear, and 5 feet of clear space overhead. The 18-inch rear figure relies on Southwest Research Institute testing; it does not reduce the distance to windows, doors, or other openings, which the new manual leaves to locally adopted codes. New Jersey's Division of Codes and Standards reads the fuel gas code as sending inspectors to NFPA 37 and the manufacturer's instructions, where the baseline is five feet from openings in a wall.

Generac's manual adds a warning that belongs in every siting decision: a unit placed at code distance may still let carbon monoxide into the house, so it may need to go farther away. On a narrow Essex County side yard, the town's setbacks can be the tighter limit, which is covered in the next section.

04 / New Jersey permits and PSE&G

Three approvals and one utility application sit between delivery and the first start.

The New Jersey Uniform Construction Code requires a permit before anyone installs equipment the code regulates (N.J.A.C. 5:23-2.14). A standby generator does not appear on the state's ordinary-maintenance list or its minor-work list, and the Division of Codes and Standards has said that if any part of a project falls outside minor work, the whole job needs a full permit. Plan on a full permit application with these parts:

The code edition changed this summer

New Jersey adopted the 2023 National Electrical Code as its electrical subcode effective August 17, 2026, replacing the 2020 edition. For six months after a subcode revision, a complete permit application may still be reviewed under the previous code, so a job filed now could be reviewed under either edition. Four sections matter most for a generator:

• Outdoor emergency shutdown (445.19(C)). Any generator at a one- or two-family home, other than a cord-and-plug portable, needs an emergency shutdown device outside the house. A switch on the generator enclosure can satisfy it.
• Outdoor emergency disconnect (230.85). Where service equipment is replaced, the home needs a readily accessible outdoor emergency disconnect. A service-rated automatic transfer switch that becomes the service disconnect is marked as both. New Jersey deleted the separate feeder rule in 225.41 as a duplicate.
• Surge protection (230.67). Where dwelling service equipment is replaced, a Type 1 or Type 2 surge-protective device is required.
• Standby capacity (702.4 and 702.5). Transfer equipment is required. With automatic transfer, the generator must carry the full connected load unless an energy management system limits what it picks up.

West Orange and Montclair, side by side

A state bill that would let automatic standby generators skip zoning approval at certain homes (A3401) was introduced in 2024 and has not become law. Fees change by ordinance; confirm the current schedule with the construction office before you budget.

PSE&G has to approve the gas side

West Orange and Montclair are in PSE&G's territory for both gas and electric service. PSE&G states that residential customers must apply to add or increase service for gas generators. The online Gas Service Application has an Adding Load request type, asks for the existing connected load and the new generator load, offers standard 1/4 PSI service or 1 or 2 PSI, requires the generator's specification sheet where the unit needs 7 inches of water column or more, and asks for the plumber's contact details. PSE&G says gas generator projects can take up to six weeks.

This step catches people who assume the existing meter can simply feed one more appliance. Generac's manual tells installers to confirm that the meter can supply the generator and every other gas appliance at once, and to size the pipe for the generator's full-load input. An NFPA electrical inspector writing about dwelling generators noted that installers often had not asked the utility whether the meter was large enough. If you are served by Elizabethtown Gas, it quotes four to six weeks for upgrade work; New Jersey Natural Gas reviews generator requests within 15 business days and allows about six weeks for upgrades.

05 / What size you need

Size the generator to the loads. Square footage is only the starting guess.

Generac's own sizing guide says most homes need a generator sized around the appliances and systems they want to keep running, not square footage alone, and it gives a simple formula: the sum of the running wattages plus the single largest starting surge. The square-footage rules that cost sites publish disagree with each other by a factor of two, which is the clearest sign that floor area cannot size a generator by itself.

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Three New Jersey details change the answer. First, the natural gas rating is lower: Generac's 22 kW unit is rated 21 kW on natural gas and its 26 kW unit 24 kW, so size against the gas figure. Second, the code sets a floor under an automatic system: with an automatic transfer switch, NEC 702.4 requires the generator to carry the full automatically connected load unless an energy management system limits it. Third, central air is the load that decides most North Jersey sizing, because Generac notes a 3-ton unit needs about 3.5 to 5 kW to run but can demand 15 to 18 kW to start.

That is where load management pays for itself. Generac's spec sheets say load managers can reduce the overall size and cost of the system, and its sizing guide describes pairing a 14 or 18 kW unit with a load manager or a soft-start kit so a smaller generator can still run the air conditioner. Angi prices smart load management at $150 to $300. For a 2,000-square-foot house on gas heat, the difference between an 18 kW bundle ($6,769) and a 22 kW bundle ($7,369) is $600 at list, so the right answer depends on the loads, not on saving the smallest possible number.

07 / Is it worth it

Is a whole house generator worth it in New Jersey? The outage record says long failures are rare, but real.

The honest case for a standby generator here is not the everyday outage. PSE&G reports that when the power goes out, its customers are restored within 62 minutes on average. The case is the handful of storms that leave North Jersey dark for days:

Ida is the storm that matters most for Essex County basements. Newark Airport's peak hour of rain that night ran at a rate the State Climatologist rates as a 1-in-1,000-year event, and the National Weather Service describes catastrophic flash flooding over portions of central and northern New Jersey. A sump pump without power is the most expensive way to learn what an outage costs.

So a standby generator is usually worth it when at least one of these is true: the house has a finished basement that depends on a sump pump; someone at home relies on powered medical equipment or works from home; the gas furnace or boiler needs electricity for its controls, blower, or circulators and the house cannot sit cold for days; or the house is often empty, so an automatic start protects it without anyone there. It is usually not worth it for a household that can leave for a day or two, rents, or rarely loses power for more than a few hours. For those homes the portable path below, or PSE&G's new home battery pilot, which offers a $5,000 incentive toward a qualifying battery, may be the better spend.

08 / Generac disadvantages

The disadvantages of a Generac generator, stated plainly.

This is one of the most asked questions about Generac, and the answers are mostly in Generac's own documents. None of them is a reason to rule the brand out; they are the costs and limits to price in before signing.

09 / Install it yourself?

Can you buy a Generac and install it yourself in New Jersey?

Legally, a homeowner has more room than most people expect. New Jersey's electrical licensing law exempts work a person does on the dwelling they live in (N.J.S.A. 45:5A-18(n)), the plumbing law exempts a single-family homeowner working on their own dwelling (N.J.S.A. 45:14C-12.4), and the construction code lets a single-family homeowner do licensed-trade and propane work on their own home (N.J.A.C. 5:23-2.15). The permit forms have an Exempt Applicant box for exactly this. The permits, inspections, zoning review, and PSE&G application still apply.

Practically, three things push the job to licensed contractors. Generac says professional installation is required, not optional, and that the warranty demands it; its installation manual says only qualified service personnel may install the unit and that the fuel connection must be made by a qualified professional. PSE&G's gas application asks for the plumber's name and contact details. And the job touches the electric service itself: DCA requires a utility cut-in card for every generator installation. New Jersey's Division of Codes and Standards confirms that licensed electrical contractors may install generators, and that licensed electrical contractors, licensed HVACR contractors, and licensed master plumbers may install the gas piping to a generator and sign and seal the mechanical technical section.

MDL's published credentials are a New Jersey electrical contractor license (#34EI01606200), an electrical business permit (#34EB01606200), and a New Jersey master HVACR license (#19HC00308200), the license types DCA names for generator and generator gas-line work. Anyone can check a contractor on the Division of Consumer Affairs license verification system. MDL confirms which parts of a specific project it performs in the written scope.

10 / Running cost and upkeep

What it costs to run on PSE&G natural gas, with the math shown.

The cost to run a standby generator is fuel plus maintenance. For fuel, take the gas use from the spec sheet, convert it to therms, and multiply by the PSE&G rate. PSE&G's residential gas tariff effective September 1, 2026 sets the supply price at $0.363424 per therm and the delivery charges, with the riders PSE&G bills together, at $0.689930 per therm, including sales tax: $1.053354 per therm in total. PSE&G converts cubic feet to therms with a factor printed on each bill; its sample bill uses 1.038.

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At half load, a three-day outage on the 22 kW unit costs about $174 in gas, and a 14-day outage the length of Sandy's statewide restoration about $812. The math excludes the $10 monthly service charge, which a gas customer already pays, and the October-to-May balancing charge of $0.097699 per balancing therm, which applies to part of winter use. PSE&G has asked the BPU to keep the supply price flat from October 1, 2026, and the tariff allows limited supply increases each December and February, so re-run the numbers with your own bill. On propane, the same 22 kW unit uses about 59 gallons a day at half load and 89 at full load.

Upkeep and the weekly exercise

A standby unit starts itself on a schedule to prove it works. Generac's current controller offers weekly, every-other-week, or monthly exercise, runs 5 minutes by default (adjustable to 20), and uses a low-speed quiet test. Maintenance follows the schedule in the disadvantages list above, and a yearly fuel-system leak test and water-intrusion check are also on Generac's schedule. Published maintenance costs run $80 to $300 (Angi) and $200 to $600 a year (ConsumerAffairs).

11 / The cheaper alternative

The cheaper alternative: a portable generator, an inlet, and an interlock or transfer switch.

If your outages are mostly short and someone is usually home, a portable generator connected the right way covers the essentials for far less. Generac lists portables with carbon monoxide shutdown at $939 for a 6,500-watt GP6500, $1,159 for an 8,000-watt GP8000E, and $1,289 for a tri-fuel GP9500E rated 9,500 running watts on gasoline that can also run on propane or natural gas. The house connection is where the safety and the cost sit:

In New Jersey, either connection is new electrical work at the panel. The state code exempts portable generators from permits only for carnivals and fairs, and Manalapan Township's published guidance says an inlet with an interlock or a transfer switch requires an electrical permit and installation by a licensed electrical contractor or a homeowner in their own single-family home; Lambertville also requires an electrical permit for it. Because the connection is manual, NEC 702.4 lets you size the portable to the loads you choose to run at one time, and the inlet needs a warning sign stating which generator may be connected.

The trade-offs are real. Someone has to be home to wheel it out, start it, switch the interlock, refuel it, and shut it down. It powers only the circuits you choose. And carbon monoxide is the leading danger: the CPSC's latest report estimates that generators were involved in 93 of 274 consumer-product carbon monoxide deaths in 2022, and the agency tells owners to run portables outside only, at least 20 feet from the house. PSE&G warns that plugging a generator into a wall outlet backfeeds the lines and can electrocute utility workers and neighbors; never do it. If a storm leaves damaged wiring or a hazard at the house, use MDL's emergency electrician line rather than a generator.

12 / Decision table

Standby, managed standby, portable, or nothing: pick by the house, not the brochure.

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Whatever the path, the next step is the same: a load list, a look at the service and panel, and a site check against the manufacturer's clearances and the town's setbacks. MDL's generator installation, repair, and maintenance page explains how MDL scopes that work in West Orange and Essex County, and the panel upgrade guide covers what to do when the service or panel is the limit.

13 / About this guide

Why a West Orange electrical and HVAC contractor wrote a cost guide with no MDL prices in it.

Generac is named throughout because it is the brand most New Jersey homeowners search for; this guide is not a dealer or certification statement, and the prices here are public list, retail, and cost-site figures, not MDL quotes. MDL Electric Cooling & Heating works from 4 Harrison Avenue in West Orange and publishes service coverage across Essex, Morris, and Hudson counties. The honest way to price a generator is a written scope for the actual house, and that starts with the address, the loads, and the service. Contact MDL or use the request form below.

14 / Direct answers

Whole house generator questions New Jersey homeowners ask before they buy.