Top 10 Generator Fuel Types – Pros and Cons

By Alex McGill

In a world buzzing with energy needs, the heart of power generation lies in the diverse spectrum of generator fuel types. From the fiery embrace of fossil fuels to the dance of renewables with the wind and sun, these fuel choices power the rhythm of our modern lives.

As we navigate through a landscape fueled by innovation, understanding the nuances of generator fuel types becomes paramount. Join us on a journey where choices are not just about power but also about sustainability, efficiency, and the collective impact we make. Unveil the secrets that spark the heartbeat of our power-hungry world.


  • Gasoline generators are versatile and reliable for various applications, commonly used for outdoor activities and emergency backup power.
  • Diesel generators are known for high fuel efficiency and are built to withstand heavy loads and operate continuously.
  • Natural gas generators are a reliable and readily available fuel source for backup power, with lower emissions compared to other fuel types.
  • Propane generators are cleaner-burning fuel compared to gasoline, with a longer shelf life and lower maintenance requirements.

Why Does a Generator Need Fuel?

A generator’s reliance on fuel mirrors the human body’s dependence on sustenance. In essence, fuel acts as the lifeblood, propelling the generator into action. This combustible source serves as the catalyst, initiating a chain reaction that ultimately generates electrical power.

Conversion of Energy: Behind the scenes, the process unfolds with remarkable precision. The fuel, whether it be gasoline, diesel, propane, or another variant, undergoes a transformative journey within the generator’s engine. Through combustion, chemical energy stored in the fuel metamorphoses into mechanical energy, setting the generator’s components into motion.

Power Generation Mechanism: Picture a symphony of mechanical parts orchestrated by the controlled explosion of fuel. The resulting kinetic energy propels the generator’s internal components, namely the rotor and stator, inducing the generation of electricity. This intricate dance of energy conversion underscores the pivotal role of fuel in the generator’s functionality.

In essence, the symbiotic relationship between generators and fuel epitomizes the dynamic interplay of science and engineering, showcasing how the right fuel is the catalyst for transforming latent energy into a readily available power source.

Ultimate Guide to Generator Fuel Types

What are Different Generator Fuel Types?

Generator fuel types vary depending on the type of generator and its intended use. The most common generator fuel types include:

  1. Gasoline: Gasoline-powered generators are versatile and widely available. They are commonly used for small portable generators and backup power for residential applications. However, gasoline has a shorter shelf life compared to other fuels, so it requires stabilizers for long-term storage.
  2. Diesel: Diesel generators are known for their durability and efficiency. They are often used in industrial settings, hospitals, and as backup power for critical facilities. Diesel fuel has a longer shelf life compared to gasoline and is less flammable, making it a reliable choice for long-term storage.
  3. Natural Gas: Natural gas generators are connected directly to a natural gas line and provide a continuous and reliable source of power. They are commonly used in urban areas and for standby power in commercial buildings. Natural gas is a clean-burning fuel, which reduces emissions.
  4. Propane (LPG): Propane generators use liquefied petroleum gas (LPG) stored in tanks. They are versatile and can be used for both portable and standby applications. Propane has a long shelf life and is considered a clean-burning fuel, producing fewer emissions compared to gasoline.
  5. Biogas: Biogas generators use organic matter such as agricultural waste, sewage, or landfill gas as fuel. They are environmentally friendly and can be a sustainable option for power generation in certain settings. Biogas is a renewable resource, as it is produced from organic materials.
  6. Hydrogen: Hydrogen-powered generators are a clean energy option, producing only water vapor as a byproduct. They are considered an environmentally friendly choice, particularly when hydrogen is produced using renewable energy sources.
  7. Solar: Solar generators harness energy from sunlight using photovoltaic cells. They are an eco-friendly option, generating power without emissions or noise. Solar generators are commonly used for small-scale applications and as backup power sources.
  8. Wind: Wind generators, also known as wind turbines, convert wind energy into electricity. They are a sustainable option for large-scale power generation. Wind turbines are commonly used in wind farms to produce electricity for the grid.
  9. Dual Fuel: Dual fuel generators provide the convenience of using either gasoline or propane as fuel, offering users flexibility based on availability, cost, or specific application needs.
  10. Tri-Fuel: These generators provide versatility with the capability to run on gasoline, propane, and natural gas, offering users the flexibility to choose fuel sources based on availability and preferences.

Each generator fuel type has its own set of advantages and considerations, which influence their suitability for specific applications and environments. It’s important to choose the right fuel type based on factors like power needs, availability, environmental impact, and budget.

Guide to Generator Fuel Types

Now let’s discuss these generator fuel types in detail.

Gasoline Generators

Gasoline generators, powered by the ubiquitous fuel used in automobiles, stand out as versatile solutions for various power needs. Their prevalence in small portable generators and as backup power for residential applications speaks to their convenience and accessibility. The inherent nature of gasoline as a readily available resource contributes to the widespread use of these generators in diverse settings.


  • Gasoline generators are known for their adaptability, making them suitable for a range of applications, from camping trips to emergency home use.
  • The accessibility of gasoline makes these generators easy to refuel, especially in areas where other fuel types might be less accessible.

While gasoline generators offer practicality and ease of use, their suitability depends on the specific needs of the user. Factors such as the frequency of use, the duration of power needs, and environmental considerations play a crucial role in determining whether a gasoline generator is the optimal choice.

Now, let’s move on to discuss diesel generators, another popular option for power generation.

Diesel Generators

Diesel generators, fueled by diesel, distinguish themselves with a reputation for durability and efficiency. This makes them well-suited for demanding applications, including industrial settings, hospitals, and as backup power for critical facilities. The use of diesel fuel in these generators contributes to their robust performance and reliability.


  • Diesel generators are known for their robust construction and efficient operation, making them suitable for prolonged and heavy use.
  • Diesel fuel has a longer shelf life compared to gasoline, reducing the need for stabilizers in long-term storage.
  • Diesel is less flammable than gasoline, enhancing safety during storage and use.


  • While more efficient, diesel generators still emit pollutants during operation, which may be a consideration in environmentally sensitive areas.
  • Diesel generators often have a higher initial cost compared to gasoline generators, making them a significant investment.

Diesel generators are a robust choice for applications where durability, efficiency, and a longer shelf life are crucial factors. Their deployment is particularly common in scenarios where continuous and reliable power is essential, such as in industrial or critical infrastructure settings. However, users should weigh the initial cost against the long-term benefits when considering diesel generators for their power needs.

Natural Gas Generators

Natural gas generators, directly connected to a natural gas line, provide a seamless and continuous power source. This makes them a popular choice in urban areas and for standby power in commercial buildings. The use of natural gas as a fuel distinguishes these generators, offering a clean-burning alternative.


  • Natural gas generators offer uninterrupted power, making them ideal for applications where a consistent power supply is critical.
  • Natural gas is a cleaner-burning fuel compared to traditional fossil fuels, contributing to reduced emissions during power generation.


  • The availability of natural gas generators is contingent on access to a natural gas line, limiting their use in remote or off-grid locations.
  • Similar to diesel generators, natural gas generators may have a higher initial cost compared to some other types of generators.

Natural gas generators shine in settings where a direct connection to a natural gas line is feasible. Their clean-burning nature aligns well with environmental considerations, making them an attractive choice for urban areas and commercial applications. However, users should weigh the initial cost and infrastructure requirements when considering natural gas generators for their power needs.

Propane Generators

Propane generators, utilizing liquefied petroleum gas (LPG) stored in tanks, offer a versatile solution for both portable and standby applications. The use of propane as a fuel source distinguishes these generators, providing a reliable and clean-burning alternative.


  • Propane generators are adaptable, suitable for a range of applications, from portable use in recreational settings to standby power for homes.
  • Propane has a long shelf life, reducing concerns about fuel degradation during storage.
  • Propane is considered a clean-burning fuel, producing fewer emissions compared to gasoline.


  • The availability of propane generators depends on the accessibility of propane fuel, which may vary in different regions.
  • Propane generators might have a higher upfront cost, although this can be offset by factors like fuel efficiency and reduced maintenance needs.

Propane generators offer a balance between versatility and environmental friendliness. Their adaptability makes them suitable for various applications, and the clean-burning nature of propane aligns with eco-conscious considerations. Users should evaluate factors such as fuel availability, upfront costs, and intended use when considering propane generators for their power requirements.

Dual Fuel Generators

Dual fuel generators provide versatility by allowing users to choose between two different fuel sources, typically gasoline and propane. This flexibility enables users to optimize fuel choice based on availability, cost, or specific application requirements. The dual fuel capability distinguishes these generators, offering a broader range of options for power generation.


  • Dual fuel generators provide the flexibility to switch between gasoline and propane, allowing users to choose the most convenient or cost-effective option.
  • With dual fuel capability, users can potentially extend the generator’s run time by seamlessly switching between fuels as needed.
  • Propane, one of the common dual fuels, is considered a clean-burning fuel, reducing emissions compared to traditional gasoline.


  • Dual fuel generators may have more complex mechanisms compared to single-fuel generators, potentially leading to increased maintenance requirements.
  • Dual fuel generators can have a higher upfront cost compared to single-fuel counterparts due to the added complexity and features.

Dual fuel generators offer a valuable compromise between fuel versatility and power generation needs. Users should weigh the advantages of having multiple fuel options against potential complexities and costs when determining if a dual fuel generator is the optimal choice for their specific requirements.

Tri-Fuel Generators

Tri-fuel generators provide a unique and adaptable power solution by allowing the use of three different types of fuels—typically gasoline, propane, and natural gas. The flexibility to switch between these fuels makes tri-fuel generators versatile and suitable for various scenarios.


  • Tri-fuel generators offer the convenience of using multiple fuel sources, providing flexibility based on fuel availability and user preferences.
  • The ability to switch between fuels extends the generator’s runtime, allowing continuous operation even if one fuel source is unavailable.
  • Tri-fuel generators can be used in different settings, from residential backup power to outdoor events, offering adaptability to varying fuel availability.


  • The inclusion of multiple fuel systems can add complexity to the generator, requiring additional maintenance compared to single-fuel generators.
  • Tri-fuel generators may have a higher upfront cost due to the complexity of their design and the integration of multiple fuel systems.

Tri-fuel generators are an excellent choice for users seeking versatility and adaptability in their power solutions. When considering a tri-fuel generator, users should weigh the benefits of fuel flexibility against the potential added complexity and initial investment, ensuring that the generator aligns with their specific needs and preferences.

Biogas Generators

Biogas generators operate on a distinctive principle, utilizing organic matter such as agricultural waste, sewage, or landfill gas as fuel. This environmentally friendly approach sets them apart as a sustainable option for power generation in specific settings. The use of biogas as a renewable resource underscores the eco-conscious nature of these generators.


  • Establishing the infrastructure for biogas generators, including waste collection and processing, can be complex and may require a significant initial investment.
  • Biogas generators may have limited applicability based on the availability of suitable organic waste materials, making them more viable in certain settings than others.

Biogas generators align with a sustainable and environmentally conscious approach to power generation. Their effectiveness, however, depends on the availability of organic waste materials and the feasibility of establishing the necessary infrastructure. Users considering biogas generators should assess the local conditions and waste disposal systems to determine the viability of this eco-friendly power generation option.

Solar Generators

Solar generators harness energy from sunlight using photovoltaic cells, presenting an eco-friendly option for power generation. The use of solar energy distinguishes these generators, offering a sustainable and renewable source of electricity.


  • Solar generators utilize sunlight, a virtually limitless and renewable resource, making them a sustainable option for power generation.
  • Solar power generation produces no emissions or noise, contributing to a cleaner and quieter environment.
  • Once installed, solar generators have minimal operating costs since sunlight is free, making them cost-effective in the long run.


  • Solar power generation is dependent on sunlight, resulting in intermittent power output. Energy storage solutions, like batteries, may be required for continuous power availability.
  • The upfront cost of solar generator systems, including solar panels and inverters, can be relatively high. However, this cost is gradually decreasing with advancements in technology.

Solar generators offer an environmentally friendly and sustainable solution for power needs, especially in regions with ample sunlight. Users should consider factors such as local sunlight conditions, the need for additional energy storage, and the initial investment when evaluating the suitability of solar generators for their specific applications.

Hydrogen Generators

Hydrogen-powered generators represent a clean energy option, producing only water vapor as a byproduct. The use of hydrogen as a fuel aligns with environmental sustainability goals, particularly when hydrogen production utilizes renewable energy sources.


  • Hydrogen generators produce electricity without emitting harmful pollutants, contributing to a cleaner and more sustainable energy landscape.
  • The only byproduct of hydrogen combustion is water vapor, making it an environmentally friendly choice with minimal impact on air quality.


  • Hydrogen production, especially through methods like electrolysis, can be energy-intensive and may face challenges in terms of scalability and cost-effectiveness.
  • The infrastructure for hydrogen production, storage, and distribution is still in the early stages of development, which may limit widespread adoption.

Hydrogen generators hold promise as a green energy solution, especially when coupled with advancements in renewable hydrogen production methods. While they present environmental advantages, users should consider the current state of hydrogen infrastructure and the evolving landscape of hydrogen production technologies when evaluating the feasibility of hydrogen generators for their energy needs.

Wind Generators

Wind generators, commonly known as wind turbines, convert wind energy into electricity, providing a sustainable option for large-scale power generation. The use of wind power as a renewable resource sets these generators apart, harnessing the kinetic energy of the wind to produce electrical power.


  • Wind power is a renewable resource, and wind generators provide a sustainable option for generating electricity without depleting natural resources.
  • Once installed, wind generators have relatively low operating costs, as the fuel source (wind) is free.
  • Wind turbines are scalable and can be deployed in wind farms to generate significant amounts of electricity for the grid.


  • Wind power is intermittent and depends on wind speed, resulting in variations in power output. Energy storage or alternative power sources may be necessary for consistent energy supply.
  • Large wind turbines can have visual and noise impacts on the surrounding landscape, which may be a consideration in residential or scenic areas.

Wind generators excel in large-scale power generation scenarios, especially in regions with consistent and sufficient wind resources. Users should assess factors such as local wind conditions, potential visual and noise impacts, and the need for supplementary power sources or energy storage when evaluating the feasibility of wind generators for their energy requirements.

Factors to Choose the Right Fuel Type for Your Generator

Selecting the appropriate fuel type for your generator is crucial to ensure optimal performance and longevity. Consider the following factors when making this critical decision:

  • Power Requirements:
    • Evaluate the power needs of your appliances and equipment. A higher wattage generator may require a fuel type that provides efficient energy output.
  • Availability:
    • Assess the availability of different fuel types in your area. Opt for a fuel that is easily accessible, preventing disruptions during power outages.
  • Storage and Shelf Life:
    • Consider the storage requirements and shelf life of various fuels. Some fuels, such as propane, have a longer shelf life and are easier to store than others.
  • Cost:
    • Compare the cost of different fuels, factoring in both the initial investment and ongoing expenses. Keep in mind that fuel prices can vary regionally.
  • Environmental Impact:
    • Be mindful of the environmental impact of your choice. Propane and natural gas are cleaner-burning options, reducing emissions compared to diesel or gasoline.
  • Generator Type:
    • Different generators may be optimized for specific fuel types. Ensure compatibility between your generator model and the chosen fuel to maximize efficiency.
  • Fuel Stability:
    • Evaluate the stability of the fuel over time. Diesel, for example, is known for its stability and is less prone to degradation compared to gasoline.
  • Emergency Situations:
    • Consider the availability during emergencies. Some fuels might be more readily available than others during natural disasters or crises.
  • Local Regulations:
    • Check local regulations regarding the storage and use of certain fuel types. Complying with local laws ensures safety and prevents legal complications.

Choosing the right fuel type based on these factors will not only optimize your generator’s performance but also contribute to a more reliable and efficient power backup system.

Generator Maintenance Tips

Ensuring your generator runs smoothly is crucial for uninterrupted power supply. Regular maintenance not only extends its lifespan but also prevents costly breakdowns. Here are essential tips to keep your generator in peak condition:

  • Scheduled Inspections: Conduct thorough visual inspections every month, checking for loose wires, leaks, and any signs of wear and tear.
  • Oil Level Check: Regularly monitor the oil levels. Low oil can lead to engine damage. Follow the manufacturer’s guidelines for the correct oil type and change intervals.
  • Air Filter Replacement: Clean or replace the air filter as recommended by the manufacturer. A clogged filter reduces efficiency and can strain the generator.
  • Fuel System Maintenance: Ensure the fuel system is clean and free of contaminants. Use a fuel stabilizer if the generator is not in frequent use to prevent fuel degradation.
  • Battery Inspection: Check the battery terminals for corrosion and ensure they are tightly connected. Weak batteries can hinder starting and overall performance.
  • Cooling System Care: Inspect the cooling system for debris and make sure the radiator fins are clean. Overheating can cause serious damage to the generator.
  • Run the Generator Monthly: Even if there’s no power outage, run the generator for a short period each month. This keeps internal parts lubricated and ensures it’s ready when needed.
  • Keep a Log: Maintain a maintenance log, noting each inspection, oil change, and part replacement. This log helps in tracking the generator’s health and aids in timely preventive measures.
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Following these generator maintenance tips diligently ensures that your power backup system is reliable and ready to serve when required.

Generator Safety Tips

Generators are invaluable during power outages, but it’s crucial to prioritize safety. Follow these tips to ensure the proper and secure use of your generator:

  • Outdoor Placement: Always operate your generator outdoors to prevent the buildup of harmful fumes. Maintain a safe distance from windows and doors.
  • Ventilation: Adequate ventilation is essential. Keep the generator in an open space to disperse exhaust fumes and reduce the risk of carbon monoxide poisoning.
  • Dry Environment: Place the generator on a dry surface to avoid electrical hazards. Keep it away from puddles or wet areas to prevent the risk of electric shock.
  • Grounding: Properly ground the generator to reduce the risk of electric shock. Follow the manufacturer’s guidelines for grounding procedures.
  • Fuel Storage: Store fuel in approved containers in a cool, well-ventilated area, away from living spaces. Never store fuel near the generator while it’s running.
  • Fire Safety: Keep a fire extinguisher nearby and know how to use it. Generator engines can get hot, and having a fire safety tool on hand is crucial.
  • Carbon Monoxide Alarms: Install carbon monoxide alarms in your home, especially in sleeping areas. These detectors can provide early warnings if dangerous levels of carbon monoxide are detected.
  • Turn Off Before Refueling: Always turn off the generator and let it cool down before refueling. Spilled fuel on hot engine parts can lead to fires.
  • Extension Cords: Use only heavy-duty extension cords designed for outdoor use. Ensure they are in good condition and rated for the wattage of your generator.
  • Regular Maintenance: Follow the manufacturer’s guidelines for maintenance. Regularly check oil levels, filters, and other components to keep the generator running smoothly.

Remember, prioritizing safety when using generators is essential for both your well-being and the longevity of your equipment.


In conclusion, selecting the optimal fuel type for your generator is the cornerstone of its longevity and effectiveness. Each option, be it diesel, propane, natural gas, or solar power, presents distinct merits. Generator Fuel Types are not a one-size-fits-all affair, but rather a tailored choice that aligns with your priorities. Factor in availability, cost, and environmental impact to ensure your generator serves you reliably in any situation. By making an educated decision, you’re not just investing in power, but in peace of mind. So, take the time to evaluate your needs and let the right fuel type be the driving force behind your generator’s unwavering performance.


  1. Active-passive control of portable generator set radiated noise
  2. Studies on control of noise from portable power generator
  3. Development of 500 W PEM fuel cell stack for portable power generators
  4. Modeling low-bandgap thermophotovoltaic diodes for high-efficiency portable power generators

Frequently Asked Questions

Can Gasoline Generators Be Converted to Run on Diesel Fuel?

Gasoline generators cannot be converted to run on diesel fuel. The conversion requires significant modifications to the engine and fuel system, and compatibility concerns arise due to the different properties of gasoline and diesel.

How Long Can a Natural Gas Generator Run Continuously Without Refueling?

The runtime of a natural gas generator depends on various factors such as generator size, load demand, and fuel capacity. Advantages of using natural gas generators include cleaner emissions, lower operating costs, and the ability to run continuously for extended periods without refueling.

Are Propane Generators Safe to Use Indoors?

Propane generators can be safe to use indoors if proper precautions are followed and regulations are adhered to. Indoor generator safety precautions include ensuring proper ventilation, installing carbon monoxide detectors, and following manufacturer guidelines for safe usage.

Are Dual Fuel Generators More Efficient Than Single Fuel Generators?

Dual fuel generators offer several benefits over single fuel generators, including increased efficiency. When comparing the efficiency of dual fuel and single fuel generators, it is evident that dual fuel generators have a higher level of efficiency.

What Are the Main Advantages of Using Biofuel Generators Over Other Fuel Types?

The main advantages of using biofuel generators are their reduced environmental impact and the availability of renewable fuel sources. Biofuels are derived from organic materials, making them a sustainable and cleaner alternative to traditional fuel types.

What type of fuel does a generator use?

Generators can be fueled by various sources, including gasoline, diesel, propane, natural gas, or solar energy. Some models offer the flexibility to switch between different fuel types, such as bi-fuel generators (dual fuel generators) and tri-fuel generators, often known as hybrid fueled generators.

What type of gas is best for generators?

For optimal performance, it is recommended to use clean, fresh, unleaded gasoline with a minimum rating of 87 octane/87 AKI. While fuel with up to 10% ethanol is acceptable, it is advisable to use non-ethanol-premium fuel. It’s crucial to avoid using E85, gas/oil mix, or making modifications to the engine for alternate fuel use.

What is the best fuel source for a generator?

Natural Gas stands out as an excellent fuel choice, particularly where there are no storage constraints for end users. Natural Gas is widely favored in schools, industrial and commercial operations, as well as residential homes for powering backup generators, heating, and cooking.

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