Last Updated on October 17, 2025
Power is essential for countless projects including bustling construction sites, remote drilling operations and hospitals needing uninterrupted electricity. In places where grid power isn’t available, diesel generators are a great solution. But before you buy or rent one, it’s important to look at the advantages and disadvantages to determine whether a diesel generator is the right choice for you.
In this article, we’ll explore what diesel generators are, when to use them, and the pros and cons so you can make a confident, informed decision.
Pros of a Diesel Generator
There are many advantages of diesel engine generators, which make them a popular solution for almost any facility or construction site.
Durable and Reliable
A major benefit of choosing a diesel generator is that they are very durable and reliable. They hold up to a lot of wear and tear, making them ideal for rugged construction sites.
Diesel generators also tend to be low maintenance because they have fewer components than similarly sized gas generators. Renting one from a high-quality equipment provider also reduces your maintenance burden because the provider handles all repairs.
Safety
Second, diesel fuel is safer than more combustible fuels like gasoline. While any fuel has the potential to ignite, diesel has a lower risk than gasoline because it is less flammable. Additionally, diesel generators tend to use less fuel than gas-powered generators, meaning you can store fewer flammable materials on-site.
Convenience
Think of all the different tools and equipment at your site that use diesel fuel. If you have a lot of machines that already use diesel, you won’t have the hassle of buying and storing two different types of fuel.
Portable diesel generators also come in a variety of sizes, from small units that fit in a pickup truck to towable units that can power a whole building. This means you can deliver reliable power to a variety of project sites.
Efficiency
Diesel generators tend to be more efficient than gas generators since they typically use less fuel to produce the same amount of electricity. They can handle large power loads and long hours without refueling. This is especially true of the latest models, which deliver maximum power generation performance and lower costs.
Cons of a Diesel Generator
While diesel generators can meet almost any power-generation need, there are some disadvantages of diesel engine generators that you should be aware of.
High Initial Purchase or Fuel Costs
If you purchase a diesel generator, expect a higher initial cost than other generators. This can be offset by their solid resale value or eliminated completely by renting from a reliable equipment provider. You also need to consider the cost of fuel. Fuel prices can fluctuate at any moment and diesel fuel might cost more than other fuels or be difficult to obtain during periods of high demand, such as during a hurricane.
Noise Levels and Exhaust
Diesel generators can be very loud, especially the older models, and their exhaust fumes can be hazardous if not properly managed. Renting the latest models from a high-quality provider can help mitigate this disadvantage.
When using diesel generators, especially small, portable ones, always follow proper safety practices. OSHA recommends placing portable generators outdoors and far from workspaces and enclosed areas due to the risk of carbon monoxide poisoning. Proper ventilation, routine inspections and hearing protection are essential.
Cold Weather Challenges
Diesel generators can also struggle in colder weather. A generator that is too cold will struggle to start and may fail to maintain combustion. While there are upgrades and parts that can help with that, they come at an additional cost. In areas that experience cold weather, a reliable equipment rental provider will help make sure that your generator can operate efficiently and safely regardless of the weather.
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Power Your Site with Generators from Herc Rentals
Whether you need 10kW diesel generators or a 1,000 kW towable one, turn to the power experts at Herc Rentals.
We’ll help you find the best temporary construction generator that addresses all your power needs. Our wide selection of high-quality, reliable diesel generators is ready to go when you need them most.
Plus, we can help you streamline operations and keep your teams safe with equipment transportation and safety training.
Explore Herc Rentals backup power generation solutions, or give us a call at 1-800-432-6215 to talk with an expert today.
