The cost to run a Generac generator depends on fuel type, size, and load. Most homeowners spend $2–6 per hour, which adds up to approximately $48–$ 144 per day. In some cases, efficient natural gas units under lighter loads can run for $1–5 per hour, or $25–120 per day
A 22kW model typically uses 3 gallons of propane or 118 cubic feet of natural gas per hour. Knowing these costs helps families plan for power outages and budget for reliable backup power.
At Grounded Electric, head electrician Robert “Bobby” Mulholland and project manager Barret Abramow guide homeowners on standby generators. If you are considering a Generac home generator, understanding operating expenses is key to making the right decision.
Key Takeaways
- Running a Generac generator usually costs $2–6 per hour (about $48–144 per day), depending on size, fuel type, and load. Under lighter loads or with efficient natural gas units, costs can be lower at $1–5 per hour (about $25–120 per day).
- Fuel type is the biggest factor, with natural gas usually being the most affordable option, while propane and diesel can be more expensive.
- A 22kW generator consumes about 2–3.5 gallons of propane or 80–118 cubic feet of natural gas per hour, with higher loads driving up costs.
- A 12-hour outage may cost as little as 20 USD on natural gas, while multi-day outages at full load can exceed 300 USD.
- Ongoing expenses also include maintenance, servicing, and installation costs, making calculators and manual formulas useful for accurate budgeting.
Hourly and Daily Running Costs
Cost to run a 22kW Generac generator
A 22kW Generac generator typically consumes 3 gallons of propane or 118 cubic feet of natural gas per hour. Based on local fuel prices, this equals $2 to $6 per hour in operating costs.
Hourly operating cost to run a 22kW Generac generator
Load strongly affects costs. At 50% load, expenses remain moderate, while full load can nearly double daily totals. Matching generator size to household needs is the best way to control spending.
Load-Based Cost Breakdown for 22kW and 24kW Generators
This shows how load and size directly affect both hourly and daily running costs.
Fuel Type and Usage Costs
Running a Generac or whole-house generator on natural gas
A natural gas generator is usually the cheapest option since it connects directly to the home’s supply and avoids fuel storage issues.
Running a Generac generator on propane
Propane provides higher power output and works well in areas without natural gas service. A 500-gallon tank can run a backup generator for 7–10 days.
Diesel is another choice, and many homeowners search for the best diesel generator when considering fuel options, though diesel standby generators are mostly for commercial use.
Quick-Reference Costs by Fuel Type
- Natural Gas: $1.50–$3.00/hr
- Propane: $2.50–$4.00/hr
- Diesel: $3.00–$6.00/hr
- Gasoline (portable generators): $2.50–$5.00/hr
These averages highlight how fuel type and generator fuel choices affect the Generac generator running cost.
Costs by Generator Size and Type
How much does it cost to run a 24kW Generac generator
A 24kW Generac generator may cost $30 to $150 per day, depending on load and fuel type.
Cost to run a whole-house Generac generator
The cost to run a whole-house Generac generator is usually $25 to $150 per day, depending on size, fuel type, and load. Whole-house systems use more generator fuel since they power HVAC, appliances, and lighting, but they provide complete peace of mind during outages.
Factors That Affect Running Costs
Load percentage and efficiency
Key factors include:
- Load percentage: Higher loads mean higher fuel use.
- Fuel prices: Local rates for natural gas or propane vary.
- Maintenance needs: Servicing improves efficiency.
- Installation choices: Generac generator installation and generator installation cost affect the budget.
Maintenance, servicing, and efficiency
Robert “Bobby” Mulholland stresses that clean filters and regular checks reduce operating costs and keep standby generators reliable.
Scenario-Based Cost Examples
A 12-hour outage at half load may cost $20–$40, while a 3-day outage at full load could reach $250–$300. These scenarios show how load, duration, and fuel type combine to shape real expenses.
Tools to Estimate Your Generator Costs
Cost to run the Generac generator calculator
A cost to run the Generac generator calculator provides quick estimates based on generator size and local fuel prices.
Generator running cost calculator
Barret Abramow often advises using a generator running cost calculator to plan for long-term expenses, not just the upfront generator installation cost.
How to Calculate Costs Manually
Use this formula: Fuel rate × Consumption/hr × Hours of use = Total cost.
Example: At $3 per gallon, 3 gallons/hr × 10 hours = $90.
Pros and Cons of Generac Generators
Clear Pros and Cons Overview
Generac home generators offer advantages but also require planning around costs.
Pros:
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- Reliable backup power during outages.
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- Provides peace of mind with whole-house coverage.
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- Offers flexibility across different types of generators and fuel sources.
Cons:
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- Generac generator costs add up with fuel and maintenance.
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- Larger units mean higher operating costs.
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- Requires regular servicing to stay efficient.
By weighing these pros and cons, homeowners can evaluate which system and fuel type best fits their needs and decide if Generac generators are worth it for their home.
Final Takeaway on Generac Generator Running Cost
The cost to run a Generac generator typically ranges from 2 to 6 USD per hour or 25 to 120 USD per day. Choosing the right generator size, fuel type, and load helps control expenses while ensuring dependable backup power.
For trusted help, contact us today and let Grounded Electric, with Barret Abramow and Robert “Bobby” Mulholland, guide your generator installation, explain different types of generators, and help answer who makes Generac generators for long-term reliability.
