Generator Cost Guide: Prices by Type, Installation & Maintenance

Understanding the True Cost of a Generator

When budgeting for a generator, it’s important to look beyond the initial sticker price. While the purchase cost is the most visible expense, it’s only one part of the total investment. Installation, fuel consumption, routine maintenance, repairs, and expected lifespan can all significantly affect what you’ll pay over time.

For example, a standby generator may cost more upfront but could last decades with proper care, delivering reliable, automated backup power for years. On the other hand, a portable generator may have a much lower purchase price but require more hands-on operation, more frequent refueling, and potentially earlier replacement.

Location also plays a role: local labor rates, fuel prices, climate conditions, and even permitting requirements can shift your total costs up or down. Understanding these variables helps you choose the right generator for both your power needs and your long-term budget.

This guide breaks down average generator prices by type, explains the factors that influence cost, and helps you make a confident, well-informed investment.

Key Factors That Influence Generator Cost

Generator Type & Size: Larger units and whole-home standby models cost more than smaller portable or inverter units.
Power Output (Wattage): Higher wattage generally increases the price but allows you to run more appliances at once.
Fuel Type: Gasoline, propane, diesel, and solar each have different fuel costs, storage needs, and availability considerations.
Installation Complexity: Standby and diesel units often require professional electrical and plumbing work, site preparation, and permits.
Brand & Features: Premium brands, automatic start systems, and smart monitoring features can raise the price.
Maintenance Requirements: Some types require more frequent service or parts replacement.
Local Factors: Regional labor rates, building codes, and climate can affect both installation and operating costs.

Average Generator Costs by Type

Generator Costs by Type
Generator Type	Unit Cost Range	Installation Cost Range	Total Estimated Installed Cost
Standby	$5,000 to $15,000	$3,000 to $8,000	$8,000 to $23,000
Portable	$400 to $2,500	$0 to $1,000 (transfer switch)	$400 to $3,500
Inverter	$500 to $4,000	$0 to $1,000	$500 to $5,000
Solar (Battery)	$1,000 to $6,000	$0 to $2,000	$1,000 to $8,000
Dual-Fuel	$600 to $4,500	$0 to $1,000	$600 to $5,500
Diesel	$5,000 to $20,000	$3,000 to $10,000	$8,000 to $30,000

Note: Costs vary by capacity, brand, and local labor rates.

Standby Generator Costs

Standby generators are the most expensive option but offer unmatched convenience.

Unit Cost: $5,000 to $15,000 depending on size and features.
Installation: $3,000 to $8,000 for electrical, plumbing, permits, and site prep.
Fuel: Natural gas or propane. Costs depend on local utility rates.
Maintenance: $200 to $600/year for service contracts.
Best Value For: Homeowners seeking full-home, hands-off backup power.

Portable Generator Costs

Portable generators are budget-friendly and versatile.

Unit Cost: $400 to $2,500 for gasoline or propane models.
Installation: $0 for cord use, up to $1,000 for a manual transfer switch.
Fuel: Gasoline or propane, varies by run time and usage.
Maintenance: Minimal — oil changes, spark plugs, and storage prep.
Best Value For: Occasional emergency use and outdoor activities.

Inverter Generator Costs

Inverter generators are more expensive than standard portables per watt, but they’re quieter and safer for electronics.

Unit Cost: $500 to $4,000.
Installation: Usually none, but optional transfer switch up to $1,000.
Fuel: Gasoline or propane, with high fuel efficiency.
Maintenance: Similar to portable generators.
Best Value For: Those who need quiet, stable power for sensitive devices.

Solar Generator Costs

Solar generators have a higher upfront cost for limited capacity but no ongoing fuel expense.

Unit Cost: $1,000 to $6,000, depending on battery size.
Installation: $0 to $2,000 if paired with rooftop or ground-mounted solar.
Fuel: None — recharged via solar panels or wall outlets.
Maintenance: Very low; occasional battery replacement after several years.
Best Value For: Eco-conscious users and off-grid applications.

Dual-Fuel Generator Costs

Dual-fuel models offer fuel flexibility without a major price premium.

Unit Cost: $600 to $4,500.
Installation: $0 to $1,000.
Fuel: Gasoline and propane, allowing extended runtimes.
Maintenance: Same as portable units.
Best Value For: Areas with variable fuel availability.

Diesel Generator Costs

Diesel units have high initial costs but a long lifespan and strong fuel efficiency.

Unit Cost: $5,000 to $20,000.
Installation: $3,000 to $10,000 for professional setup.
Fuel: Diesel; efficient but may require additives in cold climates.
Maintenance: $300 to $1,000/year for servicing.
Best Value For: Heavy-duty, long-term power needs.

Additional Cost Factors

Transfer Switch: Manual ($500 to $1,000) or automatic ($1,500 to $3,000) is required for safe connection to home circuits.
Permits: $50 to $500 depending on local regulations.
Fuel Storage: Tanks, safety cans, or additional propane cylinders.
Extended Warranties: Can add $200 to $1,000 depending on coverage.

Final Thoughts

While portable generators may be a quick, affordable fix, a standby or diesel generator is a long-term investment that offers unmatched peace of mind.

When deciding, balance upfront cost, installation complexity, fuel availability, and ongoing expenses.

A well-chosen generator can protect your home, keep your family safe, and preserve comfort during emergencies, making it one of the most important preparedness purchases you’ll ever make.

Frequently Asked Questions About Generator Costs

How much does it cost to install a whole-house generator?

A whole-house (standby) generator typically costs $6,000 to $11,000 total, including the unit and professional installation. The generator itself usually runs $3,000 to $6,000, while setup — covering electrical wiring, plumbing, permits, and site preparation — adds another $3,000 to $5,000. Larger systems or complex installations can exceed $15,000 in total costs.

Is it cheaper to run a propane or natural gas generator?

Natural gas is usually the more affordable long-term option if you have a utility connection. Propane tends to cost more per gallon, but it’s easier to store and works well in off-grid or rural areas. Actual operating costs depend on local fuel prices, generator efficiency, and how often you use the system.

How much should I budget for generator maintenance each year?

Expect to spend $150 to $600 per year on regular generator maintenance. This includes oil changes, air and fuel filters, spark plug replacements, and professional inspections. Following the manufacturer’s service schedule helps prevent breakdowns and extends your generator’s lifespan.

What’s the most cost-effective type of generator for home use?

For short-term or occasional use, a portable or inverter generator is the most budget-friendly option, usually costing $400 to $4,000. These models are easy to move and fuel but require manual operation. For long-term convenience and reliability, a standby generator — though pricier — offers automatic backup power and can last decades with proper care.

How much does a generator cost to run per hour?

Fuel consumption depends on the generator’s size and load. On average:

Portable Gasoline Generators: $1.50 to $3.00 per hour

Propane Generators: $2.00 to $3.75 per hour

Natural Gas Generators: $0.75 to $2.00 per hour

Larger systems use more fuel but can power more appliances simultaneously. Efficient maintenance and right-sizing your generator can help reduce operating costs.

Are home generators worth the cost?

Yes — especially if you live in an area with frequent outages or rely on power for medical equipment, heating, or remote work. While the upfront investment can be high, a generator offers peace of mind, property protection, and long-term value. Many homeowners find the reliability and convenience easily justify the cost over time.

How long does a home generator last?

A well-maintained standby generator can last 15 to 30 years, depending on usage hours and service frequency. Portable and inverter generators typically last 1,000 to 5,000 hours of use. Regular maintenance, proper fuel storage, and periodic testing are key to maximizing longevity.

Do generators increase home value?

Installing a whole-home generator can increase resale value by 3% to 5%, particularly in regions prone to power outages. Buyers often view it as a premium safety and convenience feature — similar to a home security system or solar setup.

Generator Cost Guide: How Much Should You Expect to Pay?