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Estimate event EV charging in four separate figures: vehicles likely to seek a charge, total energy needed in kilowatt-hours (kWh), coincident peak power in kilowatts (kW), and the number and type of chargers needed to deliver that energy during the available parking window. Attendance alone cannot tell you how many chargers to provide: first estimate car trips, then the EVs among those trips that will actually need energy, and finally when and how quickly they need to charge.
Start with vehicle trips, not attendance
Attendance is a count of people, not parked cars. The Federal Highway Administration’s planned-event method estimates automobile person trips by multiplying daily attendance by the share arriving by automobile, then divides that total by average vehicle occupancy to estimate vehicle trips. See the FHWA planned special-events handbook for its event-operations planning guidance.
For a first estimate, use:
Attendee automobile person trips ÷ average people per vehicle = automobile vehicle trips
For example, if an event expects 10,000 attendee automobile person trips and an average of 2.5 people per car, the estimate is 4,000 automobile vehicle trips. That is a planning input—not a charger count. Refine it for staff, vendors and other non-attendee vehicles if they will use event parking, and account for parking limits, turnover and the share of attendees arriving by other modes.
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For a multi-day event, calculate each day separately. For a single-day event, also map arrivals and departures across time intervals: the busiest arrival period and the time vehicles remain parked affect both the peak electrical load and how much energy chargers can deliver.
Estimate how many arriving EVs will need event charging
Not every car is electric, and not every arriving EV needs to charge at the venue. Estimate both shares from event-specific evidence where possible, such as prior event records or a targeted attendee survey. Ask about travel distance, vehicle type, expected parking duration, access to charging at the destination and—if attendees are willing to provide it—their approximate state of charge.
Use this relationship:
Automobile vehicle trips × EV share × share of EVs needing event energy = EVs seeking a charge
Audience demographics, trip distance and local charging availability can all change the share that needs a top-up. The Energy Networks Association’s UK Temporary Event Charging project makes that point in its project learning. Its reported observations—70% of festivalgoers travelled by car and journeys were 70–140 miles—belong to that project context; they are not general event or population benchmarks. The project page does not state a year for those figures.
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There is no universal event EV share or average amount of energy per event-going EV established by these sources. If local data are limited, publish low, expected and high scenarios with explicit assumptions rather than treating one borrowed percentage as a forecast.
Calculate total energy in kWh
Once you have an estimate of EVs likely to charge, estimate their average energy need at the venue:
EVs seeking a charge × average kWh delivered per charging vehicle = event charging energy (kWh)
This is total energy over the event. It is not the same as the power the site must supply at one moment. If you do not have a defensible average kWh per vehicle, set a range from stated assumptions about trip energy and arrival charge level; avoid presenting a single precise figure as though it were measured.
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Energy need varies with mileage, vehicle energy consumption, weather, driving route, temperature and dwell time. Washington State University’s fleet guidance outlines these relationships in Step 3, “Estimate Power and Charging Station Needs.” It is a useful starting point, but an event estimate also needs the arrival and parking profile.
Model coincident peak power and charging time
Peak power is the load chargers may draw simultaneously, expressed in kW. It affects whether the site’s electrical service can support charging and whether temporary supply or load management is needed. Estimate it separately from event-total kWh.
- Build time buckets. Divide the event into intervals that capture arrival waves, likely plug-in times and departure deadlines. Use a finer time scale where arrivals or departures are concentrated.
- Assign charging needs and limits. For each group of vehicles, estimate energy needed and the maximum power each vehicle can accept. A charger’s rating does not guarantee a vehicle will draw that power.
- Fit charging into dwell windows. Schedule the required energy over the time each vehicle is parked. A long dwell may allow lower-power charging; short dwell or high turnover may require a different charger mix or more capacity.
- Apply the site limit and controls. Compare the scheduled load with available electrical capacity, and state any load-management assumptions. Report the highest coincident kW under that schedule alongside total kWh.
Adding together the ratings of every charger that could operate at once gives a conservative ceiling, not necessarily the expected peak. Arrival spread, charger sharing, vehicle acceptance limits and managed schedules may reduce coincident demand. Do not apply an unexplained diversity factor: show the assumed arrival pattern and control strategy instead. The National Laboratory of the Rockies’ EVI-Pro tool estimates infrastructure needs using travel patterns, EV attributes and charging-station characteristics while accounting for uncertainty; it is not an event-specific answer unless its inputs fit the event.
The IEA EV Charging and Grid Integration Tool can help visualize use-case charging profiles against transformer capacity or peak-load periods. Its page says it was last updated 1 August 2023.
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- CONTROL FROM YOUR PHONE: A stronger built-in antenna keeps the charger online even in a garage or basement. Use the free app to start and stop charging, set the charging speed (6-48A), get reminders, and track how much energy and money each charge uses. Requires a 2.4 GHz home WiFi network.
- SAFETY-CERTIFIED & WEATHERPROOF: Independently tested and certified (UL, ETL, FCC, Energy Star). A fully sealed IP66 / NEMA 4 housing stands up to rain, snow, heat and dust indoors or out, and internal steel shielding protects the electronics for years of reliable use.
- GLOW-IN-THE-DARK HOLSTER: The included high-visibility holster glows in the dark so you can find and dock the plug easily at night. Holds the connector securely when not in use.
Translate the load profile into a charger plan
Charger count depends on more than the number of EVs. It depends on how many need energy, how much each needs, how long vehicles stay, charger power, vehicle limits, arrival coincidence and load management. Check that the proposed chargers can deliver the estimated kWh before each vehicle’s departure while keeping the coincident kW within the site’s available supply.
Long parking windows can make lower-power charging practical; shorter dwell or high throughput can call for a different mix. In the UK Temporary Event Charging project’s studied events, chargers up to 7 kW were found suitable because vehicles tended to stay parked for the event duration. That case-study result is not a universal sizing rule: the appropriate power depends on the event’s own dwell times and energy requirements.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check the site and compare temporary supply options
Before settling on a design, ask the venue or electrical provider what capacity is genuinely available, including existing loads and relevant peak periods. Then compare feasible approaches against the same event load profile. The UK project’s findings show that economics and logistics can vary by site; they do not establish a universal best option or current equipment prices.
- Existing site capacity: Can the service support the modeled peak without disrupting other venue operations?
- Temporary network connection: What connection work, reinforcement, cost and lead time would be required?
- Leased battery energy storage (BESS): What are the lease, transport, placement and recharge logistics, and how does storage fit the event load?
- Deployment and access: How will equipment and cables be routed safely without disrupting installation or blocking accessible parking and disabled-driver access?
- Operating plan: Do charger power, dwell time, throughput and load controls match the arrival and departure pattern?
- Local requirements: Which utility, connection, permitting and safety rules apply at the venue?
In its UK case comparisons, the Temporary Event Charging project reported portable battery storage as beneficial against the connection alternatives it studied, and leased BESS as cost-effective for the DNO and event organizer. Those are project-specific findings, not a guarantee for a different site. The project also described surface-mounted, self-weighted equipment and protected cable tracks as deployment aids, while emphasizing that placement must preserve disabled-driver access.
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- Charge Smart: With the user-friendly ChargePoint Mobile App, you can control your electric car charger, manage reminders, connect to smart home devices, find stations, get data and charging info, and access the latest features
- Vast Network: Wherever you go, ChargePoint’s network includes 274k+ stations across North America and Europe and 565k+ roaming partner stations
- Safe & Durable: Rely on this UL-certified EV charger for safe home charging. It can be installed indoors or outdoors by an electrician and includes a cold-resistant cable
- Fast & Powerful: This EV charger charges 9× faster than a 120V outlet, delivering up to 45 mi/hr., dependent upon your vehicle. It features a J1772 connector for all non-Tesla EVs and plugs into a 240V outlet with a 14-50 receptacle, requiring a 40A or 50A circuit. For Tesla EVs, this will require an adapter
Check electrical service, connection, permitting and safety requirements with the venue and local utility. The cited planning tools include US guidance, while the temporary-event case study is UK-specific; none establishes a single code or design requirement for every location.
Use scenarios to make uncertainty visible
Prepare low, expected and high cases for the inputs that most affect the result. For each case, show the assumptions and report all four outputs so decision-makers can distinguish parking demand from electrical demand.
- Automobile vehicle trips, by day and arrival period
- EVs expected to seek charging
- Total charging energy in kWh
- Coincident peak power in kW, with the assumed schedule and controls
- Charger quantity and power mix needed to deliver the energy within vehicle dwell windows
FHWA’s handbook offers US-focused methods for vehicle trips and peak-arrival planning; apply local event and permit conventions elsewhere. EVI-Pro and its simplified EVI-Pro Lite are US-oriented infrastructure tools, not event calculators without suitable inputs. They and the IEA profile tool can inform planning, but none replaces a site-specific arrival, parking and electrical-capacity assessment.
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