The Curb Is the Constraint

Germany put the EV charger inside the curb. No pole, no box, no lost parking space. The charging point sits flush in the kerbstone, you bring your own cable, and that's the whole interaction.

I keep a note of the moments when an infrastructure problem quietly changes shape. This is one of them, and I don't think it's mainly a charging story.

The device is Rheinmetall's Curb Charger: 22 kW AC, Type 2 socket, a unit roughly a metre long, 25 cm tall and 12 to 15 cm wide, dropped in where a standard kerbstone would sit. Rheinmetall put the unit cost below €10,000 in its 2025 material, meaningfully under a conventional pole or pillar install. The Cologne-Lindenthal field trial ran from August 2024 to March 2025 with four units: over 2,800 charging cycles, more than 50 MWh delivered, roughly 19 kWh per session, and better than 99% technical availability. A hundred surveyed users rated it 4.38 out of 5.

[BEELD NODIG] flush kerbstone charger in a city street, cable running to a parked car

None of those numbers are impressive as charging numbers. 22 kW is unremarkable. Two sessions per charge point per day is modest. Nineteen kilowatt-hours is about 120 km of range, which is a top-up rather than a fill. If you evaluate this thing on power, you'll conclude it's a minor product.

Which is why I'd evaluate it on something else entirely.

The rate limiter nobody argues about

The European Commission's target is 3.5 million public charging points by 2030. ACEA did the arithmetic in April 2024 and landed on something like 410,000 installations a year — close to 8,000 per week — roughly three times the rate at the time. ACEA also thinks the target itself is too low: the Commission's model assumes around 30 million EVs, while Strategy& and Fraunhofer ISI estimate 65 million, which makes 3.5 million a floor rather than a ceiling. Meanwhile EAFO-based projections cited by EVBoosters in December 2025 put Europe at roughly 1.2 million public points by the end of 2025. That leaves something like 2.3 million to build in five years.

I'd hold the precise figures loosely — charge-point counting methodology varies by country and the 65 million EV estimate is a forecast, not a measurement. The shape is what matters. At eight thousand new points a week, hardware is not your bottleneck. Cells aren't your bottleneck. Your bottleneck is permission, footprint and access: every new object on a pavement needs a permit, a piece of ground nobody else is using, and a way for a technician to reach it for the next fifteen years. Multiply that by two million and you can see where the queue forms.

This is the pattern I'd call the Second Job Principle: in dense environments, the fastest infrastructure to deploy is infrastructure that gives an existing object a second job. A kerbstone is already installed on every street in Europe. It's already inventoried, already on a municipal replacement cycle, already nobody's parking space. Putting a charger inside it converts a permitting problem into a maintenance-schedule problem — and maintenance schedules already run at city scale.

[BEELD NODIG] schematic: pole charger footprint vs. kerbstone footprint, side by side

The serviceability detail is where I think the engineering judgement actually shows. Rheinmetall's "CurbSwap" connector lets an operator lift out and replace the charging module without excavating the street, which is plausibly what produces 99% uptime at low operating cost. IP68 sealing, integrated cooling, and a heater for sub-zero operation cover the obvious weather objection. Serial production has started, and the company called it ready for wide introduction in May 2025, with pilots continuing in other German cities and outside Germany.

Where this could be wrong

I'd name the open questions rather than let them arrive in the comments. Bring-your-own-cable means cables lying across pavements, and that's a genuine accessibility problem for wheelchair users, buggies and anyone with limited vision. Street sweeping, snow clearance and drainage all interact with something sitting flush in the kerb line. The weather spec answers part of that; the accessibility question is, as far as I can tell, unresolved. Four units over seven months is also a pilot, not a rollout — 2,800 cycles is real usage data and it is still a small sample.

The missing number that would settle the whole argument is the share of European urban households with no off-street parking. I went looking and couldn't find a figure I'd stand behind. If you have one, I'd want it.

The part that transfers

What I'd take from Cologne isn't about cars. It's a test you can run on any deployment plan you're holding: does this require a new object in a contested space, or can it ride inside something that's already permitted, already maintained, already there?

The archive keeps handing me variations. Drone docking stations bolted to Chinese utility poles. Inductive pads under the road surface rather than a pillar beside it. Battery-swap stations that reuse a forecourt instead of demanding new grid capacity — which matters in the Netherlands, where grid connection waiting lists are now a real constraint on growth, silicon industry and charging alike.

The cleanest technologies tend to win by becoming invisible, and invisible usually means borrowed. So the question I'd put to your own city: which piece of street furniture is sitting there, fully permitted, doing exactly one job?