Planning Generators for Outdoor Events: A Guide

Helpful insights into event power generators and power distribution for events.

January 29, 2026

How to Choose

Article Updated on: September 29, 2026

Power generators for events bring sound systems, video screens, stage lights, food trucks, outdoor air conditioners and fans to life. But powering an event requires careful planning and no small amount of expertise. This overview of special event power rentals spells out four key steps to successfully planning portable power for large outdoor events.

A knowledgeable temporary power partner can help with load calculations, equipment selection and power distribution planning as well as provide all the equipment needed.

What is a diesel generator, and why does service matter for events?

A diesel generator converts diesel fuel into electrical power to run event equipment like lighting, A/V systems and food trucks. Diesel units deliver reliable output for heavy loads, but consistent diesel generator services like fuel checks, filter changes and load testing keep them running at full capacity during multi-day events. Without regular service, operators risk unplanned downtime mid-event.

Step 1: How much power does your event need?

Step one is figuring out how much power you’ll need across the whole event. Start by listing everything that requires electricity, including A/V gear (microphones, speakers, video boards, etc.), food trucks, refrigerators, restroom trailers, lights and cooling or heating equipment.

Next, write down the wattage for each asset, which should be listed on the product label. If the label lists amps and volts, calculate the wattage by multiplying volts times amps. For example, a 120-volt speaker that draws 2 amps uses 240 watts (120 x 2 = 240).

To calculate the total event power load, add up the wattage for each asset. It’s common practice to include a safety margin of at least 20%. This buffer helps account for the extra inrush (startup) current required by larger equipment such as sound systems. A quick example:

Total wattage of all devices = 12,500 watts
20% buffer (12,500 x .2) = 2,500
Total wattage needed to power your event = 15,000 watts (12,500 + 2,500)

Step 2: What size generators does your event require?

Most generators are rated in kilowatts (kW). When figuring out what size generators you’ll need, convert the total power load from watts to kW. A concert requiring 15,000 watts of energy would need at least a 15kW generator (1,500 ÷ 1,000 = 15 kW.) Keep in mind that you may need multiple generators.

Heavy-duty gear such as professional-grade AV systems, high-intensity lights and refrigeration trailers may require a three-phase generator. Three-phase generators deliver more power and a steadier, more reliable flow of electricity than single-phase units.

Step 3: How do you design a power distribution plan for an event?

Power distribution for events is critical. With a proper distribution system in place, one large generator can safely power a number of assets across multiple zones.

Start your power distribution plan by mapping out the event space zones—main stage, medical tent, vendor area, etc. Then work with your power equipment rental partner to figure out the best mix of power distribution equipment and where to place it to maximize efficiency.

Your partner can help you select a distribution panel—the main power hub for the event—as well as feeder panels such as spider panels and Edison panels to balance the electrical load. A knowledgeable temporary power provider can also guide you to the right cables and properly rated extension cords. Stand-alone circuit breakers can protect equipment from power surges. Transfer switches let you switch to backup generators as needed.

Step 4: How can a generator meet sustainability goals for a large event?

For events with sustainability goals, a battery energy storage system (BESS) paired with a generator can dramatically reduce generator run time, curbing emissions as well as fuel costs. The generator recharges the BESS batteries when it runs. During lower-load periods, the BESS automatically shuts the generator off and powers the load.

Even greater emissions reductions come from pairing a lower-emission generator with a BESS. Propane or natural gas generators produce 17% lower greenhouse gas emissions compared to diesel generators, with operating costs up to 40% less. Low-emission generators also run quieter than diesel generators.

Factor	Diesel Generators	Low-Emission Generators (Propane/Natural Gas)
Greenhouse gas emissions	Baseline	Up to 17% lower
Operating costs	Baseline	Up to 40% less
Noise level	Louder	Quieter
Service needs	Routine oil, filter and fuel system checks	Simplified fuel handling, fewer emissions-related service points
Best fit	Heavy, continuous loads (AV systems, refrigeration, etc.)	Events with sustainability goals or noise restrictions
Pairs with BESS	Yes	Yes, with greater emissions reduction

United Rentals: Your one-stop shop for event rentals

When planning temporary power for outdoor events, the vendor you choose matters.

United Rentals not only carries an extensive selection of generator rentals for events and a full line of power distribution equipment but also excels at helping customers with temporary power planning and provides onsite support to help ensure reliable event power.

Want a turnkey power package? United Rentals can help you design a custom plug-and-play solution that simplifies installation and distributes electricity efficiently through dedicated feeds.

Also consider United Rentals for your other event equipment needs, from lighting to HVAC equipment to temporary fencing, ground protection mats and UTVs.

Frequently asked questions

What does diesel generator service include?

Diesel generator service typically includes delivery, setup, fuel management and onsite maintenance support for the duration of your event. United Rentals will also help size the unit correctly and design a distribution plan around it.

Can diesel generators be paired with a battery energy storage system (BESS)?

Yes, diesel generators can be paired with a battery energy storage system (BESS). Pairing a diesel generator with a BESS reduces generator run time, which helps lower fuel costs and emissions while still providing reliable backup power during peak load periods.

How many diesel generators do I need for a large outdoor event?

The number of diesel generators you need for a large outdoor event depends on your total event load in kilowatts. Once you calculate total wattage needed (including a 20% safety buffer) and convert to kW, your power partner can help determine whether one large generator or multiple units across zones makes more sense.

When should I choose a diesel generator over a low-emission option?

Diesel generators handle heavy, continuous loads reliably and remain a strong choice for large-scale events with high power demands. Propane or natural gas units reduce emissions and operating costs but may suit moderate loads better. Your power provider can help you compare options against your load calculations.