Keeping Long Beach Powered 

Long Beach businesses run around the clock, and a dropped grid can stop a shift cold. When the power company loses the grid, a commercial power generator keeps your lights, power systems, and equipment running while utility electricity is out. Duthie Power Services has kept Southern California facilities powered for more than 60 years with generator sales, rentals, maintenance, and repair. We support operations throughout Long Beach and the Harbor area, from Signal Hill and Carson to Wilmington, San Pedro, and Lakewood. 

Our commercial clients include port terminals, logistics centers, manufacturing and aerospace plants, data centers, healthcare campuses, and municipal facilities. Our team covers the full life of your backup power source, from sizing and professional installation through ongoing service and repair.

Open Automatic Transfer Switch unit used to regulate power in emergency generators.

Automatic Transfer Switch 101

Your transfer switch is what moves your building from utility power to generator power the moment the grid fails. When it works, you barely notice, but when it faults, a healthy generator can sit idle during an outage. We keep yours tested and ready.

AQMD Permit logo.

AQMD Permits

Long Beach falls under South Coast air quality rules, and generators here need the right permits and emission records. We help facilities keep their units compliant and support the testing and paperwork that come with it.

Photo of two Duthie Power professional repair service technicians doing a quality assurance check on a generator.

Quality Assurance

Every service visit ends with documented diagnostics, run-test results, and a technician sign-off, so you have the records your audit calls for. Those same reports track battery charge, fuel condition, and oil over time, so a weak battery shows up on a scheduled visit instead of the morning the grid goes down.

What We Handle

Our team serves Long Beach operations managers, facility engineers, and industrial clients with backup power support from end to end. We handle every make, model, and fuel type, and the work scales the same whether you run a single standby generator or a fleet across multiple buildings.

  • Electric Generator Sales in Long Beach

    Picking the right unit starts with a look at your load, your fuel preference, and the space you have to work with. We help you weigh diesel and natural gas as an energy source, and spec LP vapor and standby generators from Caterpillar, Cummins, Blue Star, Generac, Gillette, and Kohler. Then, we handle the install from delivery through startup, with output voltage and frequency tuned to your building. You end up with a power generator built around your facility and a reliable power source that fits, not a stock unit that overshoots or comes up short.

  • Generator Repair and Diagnostics

    When a generator cranks but will not catch, trips offline, or throws a controller code, our EGSA-certified, union-trained technicians trace the fault to its source instead of swapping parts and hoping. We keep the repair in-house rather than routing you to a third party, and we work on standby units, ATS gear, control panels, and full Emergency Power Supply Systems from every major maker. We get your electrical system back running to OEM specifications.

  • Commercial Generator Rentals

    Covering a planned shutdown, a construction phase, or a unit that just failed? Our diesel generator rental fleet runs from 22KW to 1,500KW. Rentals ship with the fuel tanks, distribution panels, transfer switches, and cabling the hookup calls for, and we match the unit to your load so reliable backup power is on site while your primary energy source is down.

  • Generator Maintenance Programs

    A standby generator ages even when it sits idle, so we service yours on a schedule set by its runtime and your uptime demands. Visits can cover inspections, oil and filter changes, diesel fuel polishing, battery charge and load testing, and full diagnostics. Finding a weak battery or a fouled fuel line now costs far less than a power generator that will not start during the next outage.

  • 24/7 Emergency Service

    Outages do not keep business hours, and neither does our dispatch line. A live team answers every hour of the year, and our Long Beach technicians head out the moment your generator quits or the power system goes dark. If the repair will take time, we can set a rental in place so your operation is not left waiting on power.

  • Automatic Transfer Switch Service

    The transfer switch decides whether your standby generator actually carries the building when the grid drops, and a worn or stuck switch is one of the most common reasons a healthy generator never picks up the load. We service every make and model of ATS, with contact cleaning, lubrication, calibration, and functional testing to confirm the switch performs its core function, and we repair the faults behind failed-start events so the handoff happens the way it should.

Long Beach Industries That Can Count on Us 

Long Beach runs on movement. Freight comes off the ships, through the terminals, and out to the warehouses and rail lines, and none of it waits for the power to come back. We keep standby power ready for the operations that carry the local economy: port and terminal facilities, freight and cold storage warehouses, aerospace and precision manufacturing, data centers, hospitals and clinics, and city and county buildings. For a terminal, a lost feed can stall gate systems and thaw reefer racks while containers pile up. For a hospital, it puts patient monitors, medical devices, and life-safety equipment at stake. For a data center, it risks the servers and the sensitive information they hold the second the feed drops. Our engineers and technicians know the load profiles each of these sites carries, the uptime they answer to, and the South Coast AQMD permitting that comes with running a generator inside the basin.

Tested Before You Need It 

The generator you can count on is the one that has already proven it will start. A no-start during an outage almost always traces back to something a scheduled visit would have caught first: a flat battery, a clogged fuel filter, or a transfer switch that never got exercised. When your standby generator is sized right and tied to a working automatic transfer switch, it picks up the building within seconds of losing the power grid and holds it until utility power returns. Our Long Beach team keeps that whole chain healthy, from the controller and fuel system to the battery and the alternator under a load test, so nothing catches you off guard at the worst possible time.

Frequently Asked Questions

Most facilities run a short exercise cycle every week or two to keep the engine and battery healthy, plus a full load test once a year. If your generator backs up a hospital or another life-safety system, it falls under NFPA 110, whose requirements include monthly testing and an annual load bank test. We can set the schedule, run the tests, and document the results for your records.

It depends on age, condition, and how often it lets you down. A unit under warranty with a single fault is almost always worth repairing. Once a power generator passes about 15 years, breaks down often, or relies on parts that are hard to source, replacement usually costs less over time than chasing repairs. Our technicians assess the unit honestly and tell you which way the math points.

We start with a site survey to confirm placement, fuel supply, and how the unit ties into your electrical system. From there, we handle sizing, permitting, the concrete pad and electrical work, delivery, and the transfer switch connection that routes electric power to the devices and systems that you need protected, then commission the generator and test it under load before we hand it over. Timelines depend mostly on permitting and site prep, and we give you a realistic schedule up front. For additional information on placement, our blog covers proper placement in depth.

Yes. We set up remote monitoring that reports your generator’s status and flags faults as they happen, so your team hears about a problem from an alert instead of from a dark building. It is a simple way to stay ahead of a failure between service visits.

Hard or slow starts, unusual noises, visible fuel or coolant leaks, repeated alarms, heavy exhaust or soot, and a drop in run time all point to a unit that needs attention. Catching one of these early is the difference between a scheduled repair and a no-start during the next power outage. If you spot one, call and we will run diagnostics before it becomes an emergency.

It comes down to how long you need power and how much. For a planned shutdown or a construction phase, a towable diesel rental sized to your load is the right call, and we can put one on site. What does not work for a commercial building is consumer gear: a portable power station or small portable generator runs a few AC outlets, USB ports, and small devices, and solar panels can trickle-charge a battery, but none of it carries a terminal’s gate systems or a hospital’s medical devices. For permanent protection, a standby generator wired through an automatic transfer switch picks up the whole building automatically when the grid drops. Tell us the load and the timeline, and we will point you to the rental, the portable power option, or the permanent install that actually fits.

The Team Behind Your Power

The people who pull up to your site live and work in Southern California, and many have spent their careers on these units. Our EGSA-certified technicians and service managers hold every job to the same standard, write down what they find, and treat your uptime like it is their own. Whatever your generator needs look like, from a truck out today for an emergency to a sit-down site survey ahead of a new install, the team has the essential items to keep your lights on.

Jeff Castellanos

Long Beach Sales Engineer

Jeff Castellanos is the Long Beach-based Sales Engineer at Duthie Power, where he brings extensive expertise in generator systems and a strong commitment to customer service for commercial clients.

Long Beach’s Generator Experts

As a family-owned business serving Southern California for over 60 years, we work hard to deliver quality service to every customer. 

Call us today or use the Request a Quote form below. If this is an emergency, call right away, since we monitor the line 24/7.

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Testimonials

“I would recommend the services of Duthie Power Services any time. Not only were you on time with the delivery of equipment, you and your team worked quickly and efficiently to get the job completed on time.”
– Alberto Acevedo, Facility Manager

“Duthie makes it a point to contact us when our PM is coming up due instead of us contacting them. That shows they care about our generator’s performance.”
– Dean Lauff, Property Manager

“The technicians show up as promised and complete the task. No drama. We like that, very much!”
– Maria Baur, Homeowner

Photo of two Duthie Power professional repair service technicians doing a quality assurance check on a generator.

Quality Assurance

40 Years at Duthie

Very large power diesel generators in factories and buildings for emergencies.

New Generator Sizing