How Much Is a Diesel Generator in the USA? Full 2025 Cost Breakdown

If you’re in the market for a diesel generator, one of the first questions you’ll have is: how much should I expect to spend? The short answer is- it depends on your power needs, voltage, brand, and usage type (backup vs. prime).

In this guide, we break down diesel generator pricing in the USA based on real-world examples, common power ratings, and industrial applications. Whether you’re running a small business, farm, or full-scale factory, you’ll get a clear picture of what kind of generator fits your budget and your power needs.

What Impacts the Cost of a Diesel Generator?

Here are the most common factors that influence generator pricing:

1. Power Output (kW rating)

Small (20–60 kW): $14,000 – $18,000

Typical Applications:

• Small businesses (e.g., coffee shops, convenience stores)
• Residential backup for large homes or estates
• Mobile food trucks or catering units
• Construction site power for tools and lighting
• Small office buildings (1-2 floors)
• Telecom towers and remote monitoring stations
• Farming and irrigation equipment (small-scale)

Medium (80–150 kW): $35,000 – $45,000

Typical Applications:

• Mid-size commercial buildings (clinics, grocery stores)
• Apartment complexes and condominiums
• Light industrial facilities and machine shops
• Backup power for data centers (edge or secondary)
• Large-scale agricultural operations
• Municipal utility stations and water treatment plants
• Emergency backup for schools or mid-size offices

Large (160–250 kW): $45,000 – $60,000+

Typical Applications:

• Large manufacturing plants and warehouses
• Hospitals and healthcare facilities
• Hotels and large event venues
• Mining operations and oilfield equipment
• Industrial HVAC systems and chillers
• University campuses or large school districts
• Critical infrastructure and disaster recovery sites

Higher output means a bigger engine, more fuel capacity, and higher-quality components- especially for continuous duty units.

2. Voltage & Phase Configuration

Generators can come in:

• Single-phase– Common for residential & rural applications
• Three-phase– Used in industrial, commercial, and institutional setups

More complex voltage configurations often come with costlier switchgear and control systems.

3. Engine Brand

Reputable brands like Perkins, Volvo, and MTU usually cost more upfront- but they offer better fuel efficiency, longer lifespans, and readily available parts.

4. Application Type

Standby/Backup Power: Lower cost, not meant to run continuously

Prime Power: Built for long-term, daily use; more expensive but more durable

Diesel Generator Prices (Examples from Our Store)

Here’s a quick overview of our backup diesel generator models, complete with pricing to help you understand the current market range. Browse through our selection to explore options for both Prime Power and Backup Power applications.

Note: Prices above are estimates and may vary based on lead time, configuration, and optional accessories like ATS panels or enclosures.

Additional Costs to Consider
1. Delivery & Setup: $1,000–$5,000 depending on distance and site access
2. Installation: Can vary based on electrical work, permits, and concrete pad requirements
3. Fuel Storage & Piping: Custom tanks or plumbing may be needed
4. Maintenance Contracts: Recommended for long-term performance and warranty

Who Needs a Diesel Generator?

If you’re unsure whether your facility needs a diesel generator, here are common industries and applications that rely on them:

• Construction sites – For remote or off-grid builds
• Farms & greenhouses – Irrigation, climate control, and cold storage
• Manufacturing plants – Powering CNCs, compressors, and robotics
• Data centers – Backup power to prevent downtime
• Healthcare facilities – To keep critical systems running during outages
• Hotels & event venues – Quiet, continuous power for guest comfort

How to Choose the Right Generator for Your Business

If you're not sure which size or voltage setup is right for you, our team can help you:

• Assess power requirements
• Recommend engine brand based on location & serviceability
• Select the right phase and voltage configuration
• Guide you through installation and permitting
• Talk to our team for a free consultation or quote.

What Sets MasterAire Apart

• Custom-built configurations available
• Fast North America-wide delivery
• Select the right phase and voltage configuration
• Technical support and spare parts available
• Diesel generators rated for standby or continuous duty
• Multiple voltage and phase options: 120/240V, 208V, 480V, 600V

Final Thoughts

Diesel generator costs can vary widely based on size, use case, and configuration. By understanding what factors influence price- and what kind of generator is right for your business- you’ll make a smarter investment that pays off in uptime, reliability, and long-term performance.

Browse our full lineup of diesel generators or contact us to get expert recommendations with transparent pricing.