What Is Ultra-Fast Charging?
Electric vehicle charging is divided into three categories:
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| Level | Power | Time 10-80% | Where to Find |
|---|---|---|---|
| AC Slow (Level 2) | 7-22 kW | 4-8 hours | Home, office |
| DC Fast (Level 3) | 50-150 kW | 30-60 minutes | Gas stations, charging stations |
| β‘ Ultra-Fast (HPC) | 350-400 kW | 15-20 minutes | Highways |
Ultra-Fast Charging (or High Power Charging - HPC) uses direct current (DC) at voltages of 800-1000V with liquid-cooled cables. These cables can handle 500A+ currents without overheating β that's why they're thicker and heavier than standard charging cables.
CCS: The European Standard
In Europe, ultra-fast charging uses the CCS (Combined Charging System) standard. It's the same connector used by nearly all EVs in Europe, but at HPC stations it accepts much higher power. In the US, Tesla introduced its own NACS standard, which is gradually becoming the de facto standard.
IONITY: Europe's Largest HPC Network
IONITY is the dominant ultra-fast charging network in Europe. It was founded as a joint venture by the biggest automakers:
According to official IONITY data (October 2024), the network includes 684 charging stations with 4,359 charging points across 24 European countries. Target: 1,000 stations with 9,000 charging points by 2027.
Each IONITY station has 2-24 CCS charging points (avg. 6.44 points per station) and is located along major European highways. Each point can deliver up to 400 kW.
Next Generation: 600 kW!
IONITY began installing Megawatt chargers (HYC1000 by Alpitronic) in the second half of 2025. These chargers can deliver 600 kW of continuous power per point, with next-generation 800A CCS cables. The company secured a β¬600 million loan for this upgrade. (Source: Wikipedia/Ionity, electrive.net)
Which EVs Can Take Advantage of 350kW?
Not all EVs can reach 350 kW. The actual speed depends on the voltage architecture (400V vs 800V) and the battery management system:
| Model | Max DC (kW) | Architecture | 10-80% |
|---|---|---|---|
| Porsche Taycan | 320 kW | 800V | ~22 min |
| Hyundai Ioniq 5 | 240 kW | 800V | ~18 min |
| Kia EV6 | 240 kW | 800V | ~18 min |
| Tesla Model 3/Y (V4 SuC) | 250 kW | 400V | ~25 min |
| Audi e-tron GT | 320 kW | 800V | ~23 min |
| BYD Seal U | ~115 kW | 400V | ~45 min |
800V vs 400V: The Key Difference
EVs with 800V architecture (Hyundai, Kia, Porsche, Audi) can accept much higher DC charging power. 400V vehicles (Tesla, BYD, VW ID.3/4) have a lower maximum. 800V voltage means double the power at the same current β that's why the Ioniq 5 / EV6 charge so fast.
How Does Ultra-Fast Charging Work?
Charging doesn't happen at a constant 350 kW. It follows a power curve that looks like this:
That's why we say "10-80% in 18 minutes" instead of β0-100%β. Charging from 80% to 100% can take another 30+ minutes! The optimal road trip strategy: charge 10β80% and hit the road again.
The power curve explains why the Hyundai Ioniq 5 / Kia EV6 are so impressive: their 800V architecture helps them sustain high power across a wider SoC range.
How Much Does Ultra-Fast Charging Cost?
Ultra-fast charging costs more than charging at home. But it varies a lot depending on the network:
Home Charging
~β¬0.12-0.18/kWh (Greece, off-peak). A full 60 kWh charge costs β¬7-11. Ideal for daily use.
Ultra-Fast (IONITY etc.)
β¬0.39-0.79/kWh without a subscription. With a manufacturer plan (e.g. Mercedes me Charge) it drops to ~β¬0.29/kWh. A 10-80% charge on a 60 kWh battery costs β¬16-33.
Even in the most expensive scenario, ultra-fast charging is cheaper than gasoline for the same distance. But if you charge regularly at home, you'll save much more.
The Boom in the USA: 30% Growth in 2025
According to Electrek (January 2026), fast charging networks in the US recorded record growth in 2025:
- Over 64,000 DC fast-charging ports in operation
- +30% year-over-year growth in both infrastructure and demand
- Tesla leads with the Supercharger network, but competitors (EVgo, ChargePoint, bp pulse) are expanding rapidly
- Mercedes-Benz opened its first own DC fast-charging hubs
- The NACS standard (Tesla) is becoming the de facto standard β EVgo announced 500+ NACS points by end of 2026
Source: Electrek, "An astounding number of DC fast chargers came online in 2025β³, Jan. 29, 2026
What Comes After 350kW?
The technology doesn't stop:
Megawatt Charging (600 kW+)
IONITY is installing Alpitronic HYC1000 chargers capable of 600 kW per point. New Phoenix Contact CCS cables support 800A / 1,000 kW. (Source: Wikipedia/IONITY, electrive.net May 2025)
Solid-State Batteries
Solid-state batteries will be able to accept even higher charging power without the risk of overheating, making a full charge in 10 minutes a reality.
Solar + Battery Storage Hubs
New stations combine solar panels + large storage batteries, reducing dependence on the grid and lowering costs.
Verdict: Is Ultra-Fast Charging Worth It?
Advantages
- 10-80% in 18-25 minutes
- Makes long-distance travel feasible
- IONITY network in 24 countries
- Plug & Charge without apps
- Rapidly expanding infrastructure
Disadvantages
- Higher cost per kWh
- Not all EVs can utilize 350kW
- Slower in cold weather
- Power drops after 60% SoC
- Still sparse network in Greece
Verdict
Ultra-fast charging at 350kW is the technology that eliminates the last major drawback of EVs β charging time. At 18-25 minutes for 10-80%, a coffee stop is all you need. With IONITY's 684 stations across 24 countries, and Megawatt chargers at 600kW on the horizon, the future is already here. For road trips, it's a game-changer.
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