What charger utilisation benchmarks should your business use?

Compare charger utilisation only when the definition, opening hours and equipment match. Energy utilisation divides delivered kWh by rated power multiplied by time; a US government technical study uses this definition [S1]. A charger occupied for several hours can still deliver little energy. No UK-wide profitability threshold was verified for this guide, so calculate your own break-even demand. Checked October 2026.

Last checked 16 October 2026

What does charger utilisation actually measure?

There is more than one useful measure. Kilowatts (kW) describe power. Kilowatt-hours (kWh) describe energy. The US government technical study defines energy utilisation as energy delivered compared with the maximum possible delivery over the same period [S1]. It is a definition, not a UK commercial target.

Use clear labels in every proposal. A percentage without its denominator is not enough to assess investment.

These dashboard measures should be defined in your reporting agreement. Decide how a failed start, a short test session, an overnight connection and a vehicle parked after charging will appear. Keep raw totals alongside the percentages so you can reproduce them.

See charging management software for the questions to put to an operator before agreeing its report format.

Can the same charger have very different utilisation percentages?

Yes. Here is an illustration using assumed inputs, not an observed site. Take a single 50 kW charging port available for 24 hours. Assume vehicles actively charge for four hours, drawing an average 25 kW, but occupy the bay for six hours in total.

• Energy delivered is 4 × 25 = 100 kWh.
• Charging-time utilisation is 4 ÷ 24 = 16.7%.
• Bay occupancy is 6 ÷ 24 = 25%.
• Energy utilisation is 100 ÷ (50 × 24) = 8.3%.

All describe the same assumed day. Comparing its energy percentage with another site’s occupied-hours percentage would produce a misleading conclusion.

Repeat the calculation using your actual permitted access hours. If bays are shared with staff, record when they can serve customers. For a charger with shared power, ask which simultaneous output limit the report uses. A connector count is not a substitute for the number of vehicles that can charge together.

Is there a UK benchmark that tells you whether a charger is profitable?

No universal UK profitability threshold was verified for this draft. The Department for Transport reported 121,171 public chargers at the start of July 2026 [S2]. That describes infrastructure provision. It does not say how much energy your site will sell or what margin it will retain.

Treat any proposed benchmark as a request for evidence. Ask for the geography, sample dates, charger power, access hours, tariff and age of the installations. Identify whether it covers newly opened sites or established ones, and whether the number is a mean, a median or a selected successful site.

Compare like with like. A hotel’s overnight charging and a roadside rapid hub solve different driver needs. Use destination versus en-route charging before selecting reference sites.

Do not convert a busy holiday weekend into a year-round forecast. Ask to see quiet periods, closures and seasonal variation, as well as the period used in the headline.

How much use would cover your operating costs?

Build a threshold from costs you can verify. The following inputs are assumptions for an illustration, not a quote or a UK price survey. Use one consistent tax basis throughout and obtain accounting advice for your own figures.

Contribution per delivered kWh is £0.50 − (£0.20 ÷ 0.90) − £0.03 = £0.2478. Operating break-even is £2,000 ÷ £0.2478 = about 8,072 kWh a year. Using the unrounded margin, that is about 22.1 kWh a day over an assumed 365-day year.

This covers the chosen operating costs only. It leaves nothing for recovering the purchase price. If you also assume £20,000 of capital recovered evenly over five years, add £4,000 annually. The combined target becomes £6,000 ÷ £0.2478 = about 24,215 kWh a year, or 66.3 kWh a day.

Neither target includes financing, replacement or a return above capital recovery. Replace every input with your own scope. Check VAT and tax treatment with your accountant. The ROI and payback guide explains how to extend the comparison.

How should you verify a forecast before committing?

Request an evidence pack rather than a single percentage. It should contain anonymised session totals, delivered energy, actual charging hours, opening hours and outages for comparable sites. Identify free sessions, staff charging and test transactions separately from paid customer use.

For your own site, record arrivals and dwell time before installation. After opening, compare measured energy against the forecast on the same basis. If use is lower, check discoverability, tariff, access and failed sessions before adding equipment. If queues grow, examine the arrival pattern and shared-power limit first.

Reliability is a separate measure. The Public Charge Point Regulations set a 99% annual reliability requirement across an operator’s rapid network, with scope provisions including the micro-business exception [S3]. Do not treat it as a site-level usage promise. Check legal application with your solicitor and keep maintenance and uptime in your contract review.

What should you do next?

Take your forecast, its denominator and the underlying costs to the installer. Ask it to show what changes when use, energy margin or service availability falls.

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