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A Generac GP18000EFI portable generator with an orange and black design, large wheels, and a handle. A label on the front reads "18,000 watts portable generator." Various control panels and outlets are visible.
A Generac GP18000EFI portable generator with an orange and black design, large wheels, and a handle. A label on the front reads "18,000 watts portable generator." Various control panels and outlets are visible.
Front view of a portable Generac generator with an orange fuel tank, black frame, large wheels, and visible engine components labeled “G-Force EFI 816cc.”.
A portable generator sits outside a lit house in a storm with lightning. Text reads: "Portable power when and where you need it." Icons below list uses: power outage, jobsite, outdoor events, DIY projects.
Infographic showing wattage needs for appliances: Central AC 3800W, Refrigerator 700W, Power tools 600W+, Furnace 875W, Lights 100W, Arc Welder 3000W. Title: "How much power do you need?.
Two construction workers wearing safety helmets and vests work at night beside a bright work light and an orange gas-powered generator. Text highlights “Gas powered, 3.7 gallon capacity” and “9.3 hours run time at 50% load.”.

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Generac Portable Generator, 18000 | EFI | Electric Start with COsense | 50ST

SKU: G0089170
Model: 8917

$4,399.00

Pickup and Delivery Available

Professional Installation, Right at Home.

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What to Expect

Reliable power starts here.

Whether you're preparing your home or protecting your business, our expert-recommended generators offer trusted backup when you need it most.

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Holly Companies provides full-service support—from helping you choose the right generator to professional installation, maintenance, and emergency service.

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From emergency home backup to DIY projects to the jobsite, the Generac GP18000EFI portable generator provides high wattage, dependable portable power. Equipped with an 816cc engine with Electronic Fuel Injection, the GP18000EFI delivers power efficiently, providing up to 9 hours of runtime at 50% load. TruePower™ Technology safely powers sensitive electronics, appliances and tools while onboard COsense® Technology provides powerful protection against hazardous carbon monoxide. The GP18000EFI also features electric start (battery included), low-oil shutdown protection, circuit breaker protected outlets and an hour meter with maintenance resets. The included never-flat wheel kit and available lifting eye accessory make transportation easy around the home or jobsite.

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Additional information

Weight 442.8 lbs
Dimensions 39.5 × 30.9 × 36.5 in
Fuel Type

Gasoline
Wattage

22.5 kW (starting) / 18 kW (running)
Voltage

120/240 VAC
Brand

Generac

Featuring COsense® Technology: STOPS. ALERTS. SAVES. Powerful protection against hazardous carbon monoxide.

Generac 816cc EFI Engine – Delivers the right amount of power to get the best performance and efficiency out of your engine

TruePower™ Technology – With less than 5% THD, safely powers sensitive electronics and tools

Low-Oil Pressure Shutdown – Automatically safeguards engine from damage

Large Capacity Fuel Tank – With incorporated fuel gauge, provides durability and extended run times

Hardened 1 ¼” Steel Tube Cradle – For added strength and durability

Hour Meter – Tracks maintenance intervals

Heavy-Duty, Never-Flat Wheels – For reliable portability

Electric Start – Battery Included – Provides hassle-free start-up

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