Charging Success Rate: A New Metric to Make EV Charging More Reliable

Why It Matters

CSR exposes a hidden reliability gap that can deter EV drivers and gives charge point operators a concrete benchmark to improve real‑world charging performance, accelerating electromobility adoption.

Key Takeaways

• CSR combines uptime with user‑centric success data.
• European EV sessions succeed only 80‑86% despite 99% uptime.
• Short (<4 min) sessions represent 6.3% of attempts.
• CSR uses OCPP protocol for real‑time status tracking.
• Benchmark helps CPOs pinpoint and fix charging failures.

Pulse Analysis

The electric‑vehicle charging ecosystem has long relied on uptime as the primary health indicator, but uptime alone tells only half the story. Operators can report 99 % technical availability while drivers still encounter failed starts, authentication glitches, or premature interruptions. Recognising this blind spot, Germany’s National Centre for Charging Infrastructure partnered with P3 to craft the Charging Success Rate, a metric that captures the full user journey—from authentication through to a fault‑free unplug. By leveraging the industry‑standard OCPP data feed, CSR translates raw session logs into actionable insights.

P3’s analysis of more than 20,000 CCS sessions across Europe uncovered a stark disparity: while average uptime reached 96‑99 %, the user‑centric success rate lingered between 80 % and 86 %. Short charging attempts under four minutes—identified as likely errors—made up 6.3 % of the dataset, pulling the overall success figure down. CSR breaks performance into two sub‑KPIs: Authentication Success Rate, measuring the ability to initiate power delivery, and Transaction Success Rate, confirming error‑free completion and unplugging. This granular view equips charge point operators with a diagnostic toolkit to isolate whether failures stem from vehicle‑charger communication, backend authorisation, or hardware faults.

For the broader EV market, adopting CSR could become a de‑facto standard that aligns technical reliability with driver experience. A transparent, comparable benchmark encourages competition among operators, spurs investment in firmware upgrades, and informs regulators about realistic performance targets. As consumers increasingly demand seamless charging, operators that close the 14‑percentage‑point gap between uptime and success will likely see higher utilisation rates and stronger brand loyalty, ultimately supporting the scaling of electromobility across Europe and beyond.