When purchasing a generator, it’s easy to focus on the upfront cost. But for long-term savings and reliability, the real question should be: What’s the total cost over its lifetime? Whether you’re powering a home, running a small business, or supporting a remote job site, evaluating the lifetime cost is essential. In this blog, we’ll compare the total cost of ownership for diesel, gas (gasoline), and propane generators, using a 25kw generator as a reference model.

This generator size is popular for commercial properties, farms, large homes, and mobile job sites. Let’s explore how fuel type impacts long-term costs—and which option is the smartest investment.

Understanding Lifetime Cost

The lifetime cost of a generator includes:

• Initial purchase price
• Fuel efficiency and fuel price
• Maintenance and service frequency
• Generator lifespan
• Resale value or trade-in options

Choosing the right generator involves balancing all of these, not just the lowest price upfront.

Diesel Generators: High Efficiency, Long Lifespan

Diesel generators are the preferred choice for heavy-duty, long-running operations. They’re especially common in industrial and off-grid settings due to their durability and efficiency.

Initial Cost: A diesel 25kw generator typically has a higher purchase price than gas or propane models, but it offers significantly greater durability and runtime capabilities.

Fuel Efficiency: Diesel fuel is more energy-dense, delivering more kilowatt-hours per litre. A 25kw diesel generator may consume around 2.5–3 litres per hour at 75% load—making it very cost-effective over time.

Maintenance: Diesel engines require less frequent maintenance compared to gasoline units. With routine care, these generators can exceed 20,000 hours of operation.

Lifespan: Diesel generators powered by cat engines or cummins generator canada models are known to outlast comparable gasoline or propane units by years.

Verdict: Best suited for continuous or heavy commercial use where efficiency and reliability are priorities.

Gasoline Generators: Low Upfront Cost, High Operating Expense

Gasoline-powered generators are often selected for residential backup or light-duty commercial applications.

Initial Cost: A gas 25kw generator is usually less expensive than diesel, which can be appealing for buyers with tight budgets.

Fuel Consumption: Gasoline burns faster and less efficiently than diesel. It also has a shorter shelf life, making long-term storage more difficult.

Maintenance: Gasoline engines require more regular servicing. Expect to replace spark plugs, carburetors, and filters frequently.

Lifespan: Lower than diesel—typically around 8,000–10,000 hours.

Verdict: A good option for short-term or emergency use, but less ideal for daily operations or long-term value.

Propane Generators: Clean, Convenient, and Costly

Propane generators are favored for their clean-burning emissions and easy storage. They’re a popular choice for rural homes and businesses concerned about fuel shelf life.

Initial Cost: Mid-range in price—generally more than gasoline but less than diesel.

Fuel Use: Propane is less efficient than diesel. You’ll need more fuel to produce the same power, increasing operating costs over time.

Maintenance: Propane burns cleanly, so engines experience less buildup and need fewer cleanings.

Lifespan: Better than gasoline, but generally not as long as diesel.

Verdict: Ideal for users prioritizing clean fuel and ease of storage—especially in areas where propane is readily available.

Fuel Cost Breakdown in Canada

Fuel prices vary across Canada, but here’s a general comparison based on average use:

• Diesel: Most cost-effective per kWh
• Gasoline: Volatile pricing, higher long-term cost
• Propane: More stable than gas, but less efficient

When considering generators for remote or rural areas, diesel offers both availability and efficiency, making it the preferred choice.

What About Buying Used?

If you’re looking to reduce your investment while still getting a quality unit, consider a used generator for sale. Many used diesel models—especially those powered by cat engines—still offer thousands of hours of dependable use.

Used generators are often available at significantly reduced prices and may still come with limited warranties or service records. If well-maintained, a used 25kw generator can be just as reliable as a new unit.

Bonus Tip: Don’t Forget the Enclosure

Protecting your generator from weather and theft is key to extending its lifespan. Investing in a generator enclosure can prevent environmental wear and costly downtime, especially in outdoor installations.

Final Thoughts

When comparing the lifetime cost of diesel vs. gas vs. propane, diesel generators—especially a 25kw generator—come out on top in terms of efficiency, durability, and long-term value. While the upfront cost is higher, the lower fuel and maintenance expenses make diesel the smarter choice over time.

At BC Diesel Generators, we offer a full lineup of generators for sale to match your exact needs, whether you’re shopping new or exploring a used generator for sale. Contact us to learn more about fuel options, warranty coverage, and financing solutions to make your investment even more accessible.