How Much Does a Standby Generator Cost?

Start with your generator size

Quick answer

Cost breakdown

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Cost by generator size

What drives the cost

The generator unit itself is only part of the total. Installation variables, many of which you can't see until a contractor assesses the site, often add as much to the bill as the equipment.

• Generator size: The single biggest cost driver. A 10kW unit for essential circuit backup costs significantly less than a 22kW whole-home system. Every additional kilowatt adds to the unit price, and larger units also require larger transfer switches and more robust gas supply lines.
• Distance to the gas line: The generator must connect to your natural gas meter or a dedicated propane tank. If the meter is on the far side of the house and the generator must go near the electrical panel, trenching 50–80 feet of gas line through landscaping or a concrete patio can easily add $1,500–$3,000+ to the job. Short runs (under 20 feet) keep this cost minimal.
• Electrical panel condition: A modern 200A panel with available breaker slots makes the transfer switch installation straightforward. An older 100A panel, a panel already at capacity, a split panel, or a Federal Pacific/Zinsco panel that should be replaced can add $1,000–$3,000 in electrical work before the generator is even connected.
• Transfer switch type: A manual transfer switch with a load center for essential circuits costs less than a whole-home automatic transfer switch (ATS). The ATS switches power automatically within seconds of an outage, no action required from the homeowner, but costs more to purchase and install. Most standby generators include or are sold with an ATS as part of the package.
• Site preparation: The generator sits on a concrete pad, and if one doesn't exist, it needs to be poured. Uneven ground, tight clearances (generators require 18"+ from the house and must clear windows, doors, and AC units), or HOA-required screening all add labor. Snow loads, noise ordinances, and flood zone considerations can also affect placement and cost.
• Permit and inspection fees: Most jurisdictions require electrical and gas permits. Fees vary widely, a few hundred dollars in a rural county, up to $1,000 in dense urban areas with multi-step inspections. Some installers include permits in their quote; others bill them separately. Always confirm this upfront.
• Local labor rates: Contractor rates vary significantly by region. Urban markets in the Northeast and West Coast typically run 30–50% higher than rural Midwest or Southern markets for the same installation scope.

Natural gas vs propane: how fuel type affects cost

Most standby generators run on natural gas (piped from the utility) or propane (from an on-site tank). Each has different cost implications:

• Natural gas: No fuel storage needed, no refilling, and the generator can run indefinitely during an outage as long as the gas utility stays on. This is the preferred fuel for most homeowners who have gas service. The downside: if the outage is caused by an event that also disrupts gas supply (major storm, earthquake, widespread infrastructure damage), the generator goes down with it.
• Propane: Required if you don't have natural gas service, or preferred in areas where gas supply reliability is a concern. Requires a dedicated propane tank (often 250–500 gallons for a standby generator) which adds $500–$2,000+ to the total project cost. Propane also needs periodic refilling, plan for quarterly or semi-annual deliveries depending on usage and tank size.
• Dual fuel: Some generators support both natural gas and propane. Useful in disaster-prone areas but adds to equipment cost.

Operating costs

After the upfront installation, standby generators have ongoing costs that are easy to underestimate:

• Annual maintenance service: Most manufacturers recommend a professional service every 12 months regardless of usage, or after every 100–200 hours of run time. A typical annual service visit, oil change, air filter, spark plugs, battery check, coolant inspection, load test, runs $150–$400 depending on the contractor and generator size.
• Oil changes: Standby generators have small engines that require oil changes more frequently than you might expect. The first oil change is often at 25 hours, then every 50–100 hours. During a multi-day outage, a generator running 16–24 hours per day can reach that threshold in days.
• Battery replacement: The start battery typically needs replacement every 3–5 years. Budget $75–$150 for the battery itself, plus labor if you're not doing it yourself.
• Fuel cost during outages: A 14kW unit on natural gas running at half load burns roughly 100–120 cubic feet per hour. At typical gas rates ($0.80–$1.20/Ccf), that's less than $2/hour to run, a major advantage over propane or gasoline. A propane unit burning 1.5–2 gallons/hour at $3–$4/gallon runs $5–$8/hour under the same conditions.
• Weekly self-test cycle: Standby generators run a 5–15 minute self-test weekly. This small fuel consumption adds up, roughly 3–5 hours of weekly tests per year. At natural gas rates, it's negligible. At propane rates, it's worth factoring into your annual propane delivery calculation.
• Extended warranty and service contracts: Many installers and manufacturers offer extended warranties or annual service contracts for $150–$400/year. Worth considering if you're not comfortable with mechanical maintenance or if the generator is far from your home.

Is a standby generator worth it?

The honest answer depends on your specific situation. These are the scenarios where a standby generator makes strong economic and practical sense:

• Frequent or prolonged outages: If you lose power 3–4+ times per year, or if outages in your area regularly last more than 24 hours, the value of uninterrupted power adds up quickly. One avoided hotel stay, one avoided spoiled refrigerator/freezer, or one avoided frozen pipe pays for years of maintenance.
• Well pump dependence: Homes on private wells lose water when power goes out. A standby generator restores water access immediately, a non-negotiable for many rural households.
• Heating system dependence: Most modern furnaces and heat pumps require electricity even if they run on gas or oil. In cold climates, an extended winter outage without heat is a genuine safety issue and a major source of frozen pipe damage ($5,000–$30,000+ in repairs).
• Medical equipment: Home oxygen concentrators, CPAP machines, powered wheelchairs, refrigerated medications (insulin), and other medical devices create a compelling safety case for reliable backup power.
• Work-from-home or home business: If losing power means losing income, a day rate of $300–$1,000 or more, the payback math changes significantly.
• Home value: Standby generators are a selling feature in outage-prone regions. In markets where they're common, a missing generator can actually reduce a home's competitive position.

Where standby generators are harder to justify: areas with reliable power grids that experience outages only a few times per decade, renters, or situations where a portable generator and a simple transfer switch can handle essential needs for significantly less money.

Standby vs portable: a cost comparison

• Portable generator (3,500–8,000W): $500–$1,800 for the unit. No permanent installation required, but requires manual setup, extension cords or a transfer switch, and a fuel supply on hand. Suitable for occasional outages where essential circuits are the priority.
• Portable generator + transfer switch: Add $500–$1,500 for a manual transfer switch installation for a safer, more convenient portable setup. Total system cost: $1,000–$3,000. Still requires manual startup and fuel management.
• Standby generator: $5,000–$15,000+ installed. Starts automatically, runs on piped gas, no manual action required. Significantly more expensive but operates without any user intervention during an outage.

Simple takeaway

Budget $5,000–$15,000 installed for most residential standby generators, with complex installations exceeding $20,000. The unit price is only part of the cost, gas line distance, electrical panel condition, site prep, and local labor rates drive the final number as much as the generator itself. Operating costs add $200–$500/year for maintenance and fuel. The investment makes the most sense for homes with frequent outages, well pumps, critical medical needs, or heating system dependence where losing power has real financial or safety consequences.