J3400 cements its lead as US fast-charger network doubles in a year
Transportation Energy Institute's shows installed DC fast-charging capacity rose 72% year-on-year.
The US public fast-charging network nearly doubled in 2025, growing from 36,407 chargers in December 2024 to 62,457 a year later, according to the Transportation Energy Institute's (TEI) Charging Analytics Program (CAP), powered by data provider Paren. The Q4 2025 Benchmark Report shows installed DC fast-charging capacity rose 72% year-on-year, while total charging sessions grew a more modest 39%, indicating supply is expanding faster than demand. Per-charger utilization held roughly steady at around 16.4% nationally, with monthly sessions per port hovering near 214.
The most striking trend is the consolidation around Tesla's J3400 (NACS) connector. J3400-only chargers grew from 61.0% of installed hardware in October 2024 to 74.9% by December 2025, while CCS-only share fell from 26.0% to 17.8%. Performance data reinforces the shift: J3400-only chargers posted 21% growth in monthly sessions per port over the period, compared with a 25% decline for CCS-only units.
"J3400-only chargers were the most reliable, recording a first-time success average of 93.3% and a failure to charge rate of 2.7%," the report states, versus an 86.7% first-try success rate and 10.2% failure rate for CCS-only hardware.
Reliability overall improved markedly, with connection failure rates dropping from 8.1% in October 2024 to 4.9% by December 2025. Dwell time remains a compelling pitch for site hosts: chargers near supermarkets generated 132 hours of monthly customer dwell time per port, ahead of restaurants (124 hours) and convenience stores (96 hours). Utilization peaks between noon and 6 p.m., and weekends outperform weekdays, insights TEI suggests could inform staffing and promotional strategy at charging locations.
Read the full report here.
