Should you use load management or upgrade your grid connection?

Use load management when your existing supply can deliver the energy vehicles need within their parking window. Consider an upgrade when that window is too short or other loads leave insufficient capacity. Government guidance explicitly considers overnight charging over 8 hours when reviewing connection needs [S1]. Test the timetable before comparing costs. Checked October 2026.

Last checked 16 October 2026

What connection size do you actually need?

Work backwards from vehicle departures. List when vehicles arrive, how much energy they need and when each must leave. Then compare that timetable with the power remaining after your business loads. Government guidance asks businesses to review charging speed and existing electricity requirements before choosing connection capacity. It identifies slower overnight charging and changes to machinery use as options to investigate. [S1] Use the business energy saving guide to prepare the review of existing loads.

Kilowatts (kW) measure power. Kilowatt-hours (kWh) measure energy over time. In an illustration, not a design, 240 kWh delivered over 8 hours needs an average 30 kW before losses: 240 ÷ 8. Delivering the same energy in 2 hours requires an average 120 kW. That difference explains why a system suitable for parked staff vehicles may fail to serve short-stay customers even when its daily energy total looks sufficient.

Confirm how much power your site has before running that comparison. A distribution network operator (DNO) manages the local electricity network. Its agreed import limit is a separate input from your designer’s assessment of the internal installation. National Grid records agreed import capacity in kilovolt-amperes, or kVA; have the designer compare it with loads on a consistent basis. [S4]

How can load management reduce the need for an upgrade?

For this comparison, load management means controlling the charging load within an assessed site limit. Specify whether the proposed system simply shares a fixed charging allowance or changes that allowance as building demand changes. Ask the designer to demonstrate what happens when your busiest equipment and vehicles overlap.

UK Power Networks offers a fleet planning tool that considers smart charging and staged infrastructure as ways to minimise connection upgrades. [S2] That supports testing a managed option; it does not establish that your own arrival pattern will work. A controller cannot create missing energy or extend a customer’s visit.

Read dynamic load management for the control questions and dwell time and charger speed for the customer side of the decision.

When would an upgrade still be necessary?

An upgrade becomes a serious option when a realistic managed schedule cannot deliver the required service. Short depot turnarounds, overlapping departures and daytime building peaks deserve separate tests. Ask for a vehicle-by-vehicle result, including late arrivals and the busiest operating day you expect to support.

Consider this assumption-only illustration. Existing usable charging headroom is 40 kW for an 8-hour window. The arithmetic ceiling is 320 kWh before losses: 40 × 8. If the vehicles need 240 kWh, further design work may establish a workable managed schedule. If they need 400 kWh, the illustrative window is already short by 80 kWh. Changing charger labels cannot close that energy gap.

That is a screening calculation. It does not establish phase balance, electrical protection, vehicle acceptance rates or capacity at individual departure times. Ask the installer to show these constraints in its proposal and to explain any assumptions about vehicles moving between bays. Government guidance recommends discussing multiple workplace or depot chargers with the network operator early. [S1]

Could a time-profiled connection be another option?

Ask about network products as well as local controls. UK Power Networks describes a profiled connection with capacity limits that vary by time of day and contractual minimum levels. Its flexible demand connections can instead be curtailed to zero in constrained conditions. [S3] Neither description should be replaced with a promise that extra power will always arrive when your vehicles need it.

Request the actual capacity schedule and operating restrictions. Put those windows into the same departure model used for the other options. Ask who supplies the communications equipment, who responds to a control failure and what happens to charging if additional network capacity is unavailable. A managed charger installation and a restricted network connection can coexist; each needs its own clearly documented settings.

How much will the options cost, and how long will they take?

Compare proposals delivering the same charging service. Government guidance says network cost depends on required connection size and distance from the existing network, while delivery depends on the scale and complexity of the work. [S1] A headline hardware price therefore cannot settle the comparison. Use the grid upgrade cost guide to separate the scopes.

For each proposal, request capital cost, metering and board changes, software, communications, maintenance and any capacity-related electricity charges. Include the business impact if the chosen option leaves vehicles short of energy. These are comparison inputs to request, not assumed national fees. Keep funding terms separate: fully funded, part funded and self funded offers may allocate these costs differently.

Before accepting, ask for commissioning evidence showing that the proposed cap and charging timetable work together. Request a documented test of the specified response to lost monitoring or communications. Make the commissioning result and the party responsible for ongoing settings part of the handover checklist.

What should you do next?

Send your connection details, demand profile and vehicle timetable with the enquiry. Request a managed existing supply option and an upgrade option where both are technically credible. Read how we work before comparing installer responses.

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