Ask any EV owner about public charging and you’ll get a story — the app that showed a station as available when it wasn’t, the connector that wouldn’t lock, the 20-minute stop that turned into an hour. The frustration is real, but so is the data behind it, and it’s genuinely changing year to year. Here’s what the actual reliability studies say, and how to plan around the gaps that remain.
Key Numbers
- J.D. Power’s 2025 U.S. Electric Vehicle Experience Public Charging Study found the share of “non-charging visits” — pulling up but failing to actually charge — dropped to 14%, the lowest in four years the study has run.
- In that same 2025 study, DC fast-charging satisfaction scored 654 out of 1,000 (down slightly from 664 in 2024), with Tesla Supercharging leading at 709 — but the decline was driven by cost and payment complaints, not reliability.
- J.D. Power’s 2026 update shows the satisfaction landscape shifting — Ionna, Mercedes-Benz’s charging network, and Rivian’s Adventure Network posted strong enough scores to challenge Tesla’s long-standing lead in some categories.
- Independent uptime tracking for Q1 2026 put Tesla Supercharger at roughly 99.2% uptime with a 98.7% session success rate, while broader industry estimates suggest 20–25% of all US public DC fast chargers are experiencing some failure mode at any given moment.
- Electrify America’s uptime is commonly cited around 85–90%, with meaningful variation site to site depending on equipment age and maintenance history.
Short Answer
Tesla’s Supercharger network remains the most consistently reliable public charging option by essentially every independent measure — uptime, session success rate, and owner satisfaction — largely because Tesla controls the hardware, software, and maintenance of its own stations rather than relying on third-party equipment vendors. Electrify America and EVgo have both genuinely improved but still show more site-to-site variability, and newer entrants like Ionna are posting strong early reliability numbers, though on a much smaller station count than the established players. No network is failure-free — plan for it on any real road trip.
“Reliability” Means Several Different Things
Before comparing networks, it’s worth being precise about what’s actually being measured, because different studies measure different things and the numbers aren’t directly interchangeable:
- Uptime — the percentage of time a charger is operational and reporting as available, typically tracked independently through station-monitoring services.
- Session success rate — of the charging attempts that actually start, what percentage complete successfully without an error, timeout, or connection failure.
- Non-charging visit rate — J.D. Power’s specific metric for drivers who arrive at a station but leave without charging at all, whether due to a broken unit, a full lot, or a failed connection.
- Owner satisfaction score — a composite index (J.D. Power’s runs on a 1,000-point scale) that folds in cost, payment experience, station amenities, and app usability alongside pure reliability — meaning a network’s satisfaction score can decline even while its actual hardware reliability improves, exactly what happened industry-wide in 2025 when rising DC fast-charging prices dragged satisfaction down despite fewer failed charging attempts.
Network-by-Network
| Network | Reported uptime (2026 estimates) | Connector access | Notable characteristic |
|---|---|---|---|
| Tesla Supercharger | ~98–99%+ | Native NACS; most non-Tesla EVs now access via adapter or built-in NACS port | Vertically integrated — Tesla owns hardware, software, and maintenance |
| Electrify America | ~85–90%, site-dependent | CCS1 (open network) | Largest non-Tesla DCFC network on major interstate corridors; reliability varies by station age |
| EVgo | Improving, urban-focused | CCS1 (open network) | Strong marks specifically for urban/metro reliability per recent industry tracking |
| ChargePoint | Solid on Level 2; mixed on DCFC | CCS1 | Dominant for destination/workplace Level 2; DCFC hardware vintage varies widely by site |
| Ionna | Excellent per-station reliability (small sample) | Both CCS1 and NACS at every stall | New automaker-backed network; not yet tested at the scale of the larger players |
Why the Gap Exists
The pattern across nearly every comparison is the same: networks that control their own hardware end-to-end perform more consistently than networks assembling stations from third-party equipment vendors, payment processors, and site-host utility connections. When Tesla’s own software detects a fault, the same company that built the charger dispatches the fix. On an open network built from multiple hardware generations and vendors across thousands of independently-hosted sites, a fault might mean waiting on a different company’s technician, a different equipment manufacturer’s parts, or a site host’s electrical service — more parties, more potential delay. This is also why uptime varies so much by individual site within the same network: a newly installed Electrify America station with current-generation hardware and a fast repair contract performs very differently from an older station running on original 2019-era equipment.
Which Network Should You Actually Plan Around?
If you’re unsure what connector or adapter situation your specific EV falls into, our guide to EV charging adapters walks through the current NACS/CCS landscape by brand.
How to Protect Yourself on Any Network
- Check the network’s own app for real-time stall status before driving out of your way — ChargePoint, EVgo, and Electrify America all show live connector status, though it isn’t always perfectly current.
- Cross-check PlugShare for recent check-ins — a station with check-ins in the last 12–24 hours is a much stronger signal than one with none.
- Always identify a backup station on any unfamiliar route rather than betting the whole stop on one location.
- Prefer stations with more stalls — a single broken unit at a 2-stall site is a bigger problem than one broken unit at an 8-stall site.
- Keep the relevant support number saved before a long trip — ChargePoint, EVgo, Electrify America, Blink, and Tesla all have dedicated support lines for a dead-on-arrival charger.
FAQ
Why did Tesla’s own satisfaction score change between 2025 and 2026 studies?
J.D. Power’s methodology and the competitive field both shift year to year — new networks like Ionna entering the rankings, and factors like cost/payment friction weighing more heavily some years than others, can move a leader’s relative position even if its actual hardware performance stayed consistent or improved.
Is a lower uptime percentage the same as “the charger is always broken”?
No — an 85–90% uptime figure means a given station is unavailable roughly one in every seven to ten visits on average, not that it’s unreliable most of the time. It’s still meaningfully worse than a network in the high 90s, which is the real point of comparison.
Does charging speed correlate with reliability?
Not directly — a network can offer high peak kW ratings and still have inconsistent uptime, or offer modest speeds with excellent reliability. They’re separate metrics worth checking independently.
Should reliability data change which car I buy?
It’s a reasonable factor if you road-trip often and rely heavily on public DC fast charging, but daily home charging remains unaffected by any of this — check our guide to home charging setup if that’s your primary use case.
Are these numbers likely to keep improving?
The multi-year trend across J.D. Power’s own studies points toward gradually declining failure rates industry-wide, though the pace and consistency vary by network and shouldn’t be assumed to apply evenly to every operator or region.
The Short Version
Public charging reliability is measurably improving industry-wide, but it isn’t uniform — Tesla’s Supercharger network remains the most consistently reliable by nearly every independent measure, largely due to owning its full hardware-to-maintenance stack, while open networks like Electrify America and EVgo show real but uneven progress, and new entrants like Ionna are posting strong early numbers on a much smaller footprint. “Reliability” also isn’t one number — uptime, session success, and owner satisfaction measure different things and can move in different directions in the same year, as 2025’s data showed. Whichever network you’re routing around, checking real-time app status and having a backup station in mind remains the most reliable habit of all.
About the author: Written by Shurah, who researches and writes independently on the real cost of EV ownership — charging, maintenance, and total cost of ownership — backed by primary data and original calculations rather than recycled lists.
