Why the 99% Charging Rule Leaves UK Drivers and Fleets Stranded
Under the Public Charge Point Regulations 2023, rapid public chargers rated 50kW and above must be, on average, 99% reliable across an operator’s network over a calendar year. That figure is a network average, not a promise for any single unit. Before you rely on a charger for a trip or a fleet route, check the site’s live status, confirm the payment method works and keep a backup location in mind.
TL;DR:
The network-wide reliability for public chargers rated 50kW and above must be at least 99%, measured through standard data formats that track availability, charging, and reservation status.
Official reliability calculations exclude events like power cuts, vandalism, or planned maintenance, making app status figures unreliable for precise performance assessment.
Drivers and fleet managers should recheck live statuses before charging, plan backup sites, and verify payment methods in advance to minimize charging disruptions.
Meeting the legal reliability target does not guarantee a smooth experience; operational excellence involves remote monitoring, local spares, and scheduled preventive maintenance.
Regional disparities in rapid charger density, such as fewer 50kW+ chargers in London compared to Scotland, influence effective network reliability and route planning.
Table of Contents
What the Public Charge Point Regulations 2023 require
This is measured across every rapid device an operator runs, not site by site, which is why one broken charger down the road does not automatically mean the operator is falling short of its legal duty.
Operators must also report annually and publish compliance information so drivers and businesses can check performance. According to the PCPR guidance, the first annual reliability reports covering 2025 are due by 14 January 2026, with compliance details published on operator websites.
Key obligations under the regulations include:
A 99% network-average reliability duty for all rapid (50kW+) public chargers.
Annual reporting to the regulator with the first report covering 2025 due by 14 January 2026.
Public disclosure of compliance information on the operator’s own website.
Enforcement powers that can lead to penalties where operators fail to report or publish accurately.
How reliability is actually measured
Reliability is not judged by whether a charger looks online in an app. The legislation requires operators to measure it through OCPI EVSE object statuses, a standard data format that reports whether each charge point is available, charging, reserved, faulted or out of service.
Statuses that count towards reliability include:
Available: the charger is ready and waiting for a driver.
Charging: the charger is actively in use, which still counts as reliable operation.
Reserved: the charger is booked but working correctly.
Everything else, faults, offline periods, or unplanned outages, counts against the operator’s annual figure. The calculation works out mean downtime and mean time exempt across the network, then rolls this into a single annual percentage. Contactless payment terminals are treated as part of the charger itself. If contactless fails and the unit does not default to free charging, that failure counts as downtime under the statutory calculation, even if the hardware itself is working fine.
Why app uptime figures rarely match the official reliability number
Drivers often assume the percentage shown in a charging app reflects the regulated figure. It usually does not. The legislation allows certain events to be excluded from the statutory calculation, including power cuts, vandalism and planned maintenance, while most consumer apps simply show a charger as “offline” regardless of the cause.
There is also a timing gap. OCPI reporting and app polling do not always update at the same moment, so a charger can show as broken in an app minutes before the operator’s own system logs a resolution.
Consider a single rapid charger that suffers one eight-hour outage in a year.
Pro Tip: Treat any single charger’s app status as a snapshot, not a guarantee: check again shortly before you arrive.
Practical checks for drivers and fleet route planning
A charger’s published status is a starting point, not a booking confirmation. Before setting off, or before locking in a route for a fleet vehicle, a few checks reduce the risk of a wasted stop.
Recheck live status close to arrival, since a charger reported working an hour ago may have gone offline since.
Build a second site into the plan, particularly on longer routes where a single failed session could derail a schedule.
Confirm the payment route in advance, checking that contactless, the operator’s own app and any roaming network cards are all accepted at that specific site.
For fleets, request site-level data from operators, including successful-session rate, average fault duration and any recorded exemption events, rather than accepting the headline network percentage alone.
Independent analysis found that only a minority of broken rapid chargers are fixed within 24 hours, with some repaired within a week and a meaningful share taking longer, according to Transport & Environment’s consumer study. That gap between a national average and a genuinely broken site is exactly why fleet managers need site-level metrics, not just the regulator’s headline figure.
Contract and maintenance terms that protect fleets and hosts
Meeting the letter of the regulations is one thing. Delivering reliability that drivers actually notice is another, and it comes down to what buyers and hosts specify in their contracts.
Look for these operational capabilities before signing:
Live remote monitoring that flags faults automatically rather than waiting for a driver complaint.
Clear ownership of diagnostics and firmware updates, so it is obvious who is responsible when something goes wrong.
Defined response and resolution times written into the service agreement, not left as a vague promise.
Spares held locally or regionally, since a repair delayed by a part in transit is a repair that damages driver trust.
Scheduled preventative maintenance and monthly performance reporting, covering successful-session rates and fault duration.
Procurement documentation for large-scale EV charging contracts routinely specifies preventive inspections, remote diagnostics, firmware updates and predictive analytics as core requirements, which shows these terms are already standard practice among organisations buying at scale.
Pro Tip: Require test payments and full authentication checks as part of acceptance testing, and repeat them periodically. A charger that “shows available” but rejects contactless still counts as a failed session for the driver standing in front of it.
Our guide to EV charger maintenance in the UK covers these specifications in more depth.
The UK charging picture and where rapid chargers are scarcest
As of 1 July 2026, the UK had 121,171 public EV chargers, of which 28,887 were rated 50kW or above, according to DfT charging infrastructure statistics. That works out at 41.7 rapid-or-above chargers per 100,000 people nationally, but the average hides sharp regional gaps.
London has one of the highest totals of public chargers of any UK region but a comparatively lower rate of 50kW+ devices per 100,000 people, reflecting a network built more around slower on-street charging.
Scotland shows stronger rapid charger provision relative to its population, a pattern useful for fleets planning long-distance routes.
Regional disparities mean the same national 99% reliability duty can feel very different depending on how many rapid chargers actually exist nearby to fall back on.
For fleet operators choosing depot locations or planning routes, the density of rapid chargers matters just as much as the network’s reported reliability score.
Swift Charging’s view on what actually moves the reliability needle
The 99% network figure is a useful regulatory floor, not a reliability strategy. In our experience working with commercial sites, the operators who genuinely avoid driver complaints invest in integrated monitoring, local spares logistics, disciplined firmware quality control and preventative maintenance scheduled before faults occur, not after.
Grant-supported and managed installation models make these standards affordable even for smaller commercial sites, which matters because reliability should not be a luxury reserved for the largest fleets.
— Swift Charging
How Swift Charging supports reliable commercial charging
Meeting the checklist above, live monitoring, defined maintenance response times, spares availability and verified payment paths, is exactly what our EV Charger Maintenance Services are built around, with Basic, Standard and Fully Managed options depending on how hands-on you want us to be.
We also handle the groundwork that makes reliable charging commercially viable: site design, Fleet EV Charging Solutions, Public EV Charging installations for hosts, and support identifying available government EV charging grants to offset installation costs. If you host or operate rapid chargers and want a clear picture of where your site stands against these reliability requirements, get in touch for a site-specific maintenance and monitoring proposal.
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FAQ
What is the best public charging app in the UK?
There is no single official ranking, and app performance depends on which networks it covers in your area. It is more useful to check that an app shows live OCPI-based status and supports the payment method you plan to use, rather than relying on app store ratings alone.
Why is public EV charging so expensive in the UK?
Public rapid charging costs reflect higher electricity supply charges, connection and maintenance costs and the commercial margins operators need to run rapid networks profitably. Costs vary by operator and charger speed, so comparing per-kWh rates across a route before you travel is worth doing.
What is the reliability of electric cars in the UK?
This depends on the specific vehicle and is separate from public charging network reliability, which is what the Public Charge Point Regulations 2023 govern.
Are Tesco EV chargers still free?
Charging availability and pricing at supermarket and retail sites change over time and vary by operator and location, so this is not publicly listed as a fixed nationwide policy. Check the specific charge point operator’s app or signage at the site for current pricing before you plug in.
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