
In Portland, renting a diesel generator in 2025 typically costs between $150–$300 per day, $600–$1,200 per week, and $1,800–$3,500 per month. These rates vary based on the generator's power capacity and additional features. Leading rental companies in Portland provide a wide range of options suitable for various industrial needs.
| Vendor | Daily Rate | Weekly Rate | Review Score | Website |
|---|---|---|---|---|
| United Rentals | $124 | $312 | 8 | Visit |
| Sunbelt Rentals | $154 | $451 | 8 | Visit |
| Hertz Equipment Rental | $154 | $451 | 7 | Visit |
| Ahern Rentals | $124 | $312 | 7 | Visit |
| Star Rentals | $124 | $312 | 7 | Visit |
Several factors affect the rental costs of diesel generators, including the generator's power output, duration of hire, and any additional services such as delivery and setup.
When renting a diesel generator, be aware of potential hidden fees. These can include delivery and pick-up charges, which may be flat or based on mileage, fuel surcharges, and cleaning fees for excessive dirt or mud. Additionally, consider damage waivers versus full insurance options, and be mindful of late-return penalties and overtime charges.

The demand for diesel generators in Portland is expected to grow in 2025, driven by construction projects and emergency power needs. Rental companies are expanding their fleets to include more fuel-efficient and environmentally friendly models.
Ensure compliance with local regulations regarding emissions and noise levels when renting diesel generators. Portland has specific guidelines that must be adhered to, which can impact the choice of equipment.