
Renting a diesel generator in Denver in 2025 typically costs between $150–$400 per day, $600–$1,500 per week, and $2,000–$4,500 per month. These rates vary based on the generator's power capacity and additional features. Leading rental companies in Denver provide a wide range of options suitable for various industrial applications.
| Vendor | Daily Rate | Weekly Rate | Review Score | Website |
|---|---|---|---|---|
| United Rentals | $198 | $594 | 7 | Visit |
| Ahern Rentals | $101 | $254 | 8 | Visit |
| Wagner Rents Inc. | $127 | $381 | 7 | Visit |
| One Call Rentals | $180 | $540 | 9 | Visit |
Several factors affect the rental costs of diesel generators, including the power output, duration of rental, and any additional services such as delivery and setup.
When renting a diesel generator, be aware of potential hidden fees such as delivery and pick-up charges, which may be flat or mileage-based. Fuel surcharges, damage waivers, and cleaning fees for excessive dirt or mud can also apply. Additionally, late-return penalties and overtime usage fees might increase the total cost.

The demand for diesel generators in Denver is expected to grow due to increased construction and infrastructure projects. This growth may influence rental availability and pricing. Staying informed about market trends can help in negotiating better rental terms.
Ensure that the rental provider complies with local emissions regulations and provides generators that meet the necessary environmental standards.