Copenhagen's smart-city record is less a single flagship platform than a long run of narrow, durable public-infrastructure fixes: a bathing-water forecast model running since 2002, cyclist-paced traffic signals since 2007, a two-decade, DKK 20 billion flood-adaptation programme after the catastrophic 2011 cloudburst, and — after a mid-2010s stretch of bolder, higher-profile pilots that didn't all survive their funding models — a return to quieter, AI-assisted efficiency work inside the buildings and district-heating pipes that make the city's climate numbers real.
The atlas documents 10 projects in Copenhagen, the earliest dating to 2002: 6 with a documented success, 2 documented failures, 2 still running without a verdict. Every entry carries an evidence grade — the strongest here is official (8 entries) — and links its sources.
Three entries that show what Copenhagen is actually doing.
Computed from the 10 entries below — a profile, not a score.
Copenhagen's earliest digital-public-infrastructure layer had nothing to do with headline-grabbing pilots — it was about keeping two everyday systems running quietly and continuously. Since 2002, DHI's bathing water forecast system has combined rainfall and sewer-overflow data to warn swimmers when the harbour's popular bathing spots turn unsafe after a storm, still triggering real closures as recently as April 2025. From 2007, the city's Green Wave synchronized traffic signals to a steady cycling pace on its busiest bike corridors — a low-tech-looking fix, backed by the city's own before/after measurements, that is still being expanded today.
The catastrophic cloudburst of July 2011 — a flood that overwhelmed the sewer network in hours — reset the city's priorities toward large-scale climate resilience. Utility HOFOR and the City of Copenhagen adopted the Cloudburst Management Plan, a DKK 20 billion, 20-year programme of retention parks, cloudburst streets and underground tunnels built on hydraulic modelling of the city's catchments. Three years later, in 2014, that same instinct for durable infrastructure over showpiece tech showed up twice more: a citywide LED streetlight retrofit with a remotely dimmable control network replaced roughly half the city's lamps, while Bycyklen launched a bike-share fleet with a GPS-and-tablet console built into every handlebar.
The back half of the 2010s was Copenhagen's most experimental period, and its record there is honestly mixed. DTU's EnergyLab Nordhavn consortium turned the harbour district into a real smart-energy testbed from 2015 to 2019, trialling flexible district heating and DC fast-charging before winding down on schedule as a research project, its practical output later carried forward by HOFOR into other districts. The City Data Exchange, a 2016 marketplace for buying and selling urban data built with Hitachi, could not attract enough providers or buyers and closed in 2018. Bycyklen's tablet bikes, for their part, outlasted both — until the operator's public subsidies lapsed and it filed for bankruptcy in December 2022, ending the service for good.
The most recent chapter turns back to the unglamorous infrastructure the city already owned, now with a data layer added. The building energy and water surveillance system, running since 2016, keeps finding real leaks and inefficiencies with smart meters across municipal and, increasingly, private buildings. And since 2023, HOFOR and Danfoss have paired the district-heating network itself with AI-driven demand-response control — a pilot that cut peak heat load by up to 22% in its first buildings and, by late 2025, had scaled to 140 buildings shifting roughly 8 MW of flexible heating capacity.
On a time axis, by the year each one started — 2002 to 2023. Pick a dot to read what it was.
✔ Every published entry is checked against the public sources it cites before publication.
Editorial links between Copenhagen's own entries — the city as a system, not a list.
Plans and announced trajectories — not yet documented results.
Most of what comes next is expansion of things already running rather than new pilots. The Green Wave is due to reach 15 more street sections under a DKK 602.4 million line in the 2026 city budget; the Leanheat district-heating programme is aiming to grow well past its current 140 buildings toward a longer-term ambition in the thousands; and HOFOR's Kalvebod Brygge cloudburst tunnel — part of the wider flood-adaptation plan — was nearing completion in mid-2025. One researched-but-unpublished candidate remains open for a future editorial pass: the city's automatic bicycle counters on Dronning Louises Bro, solid on their core facts but short a confirmed launch date and independent verification.
Where Copenhagen appears in the atlas's own analysis.
Three cities the atlas reads next to Copenhagen — the reason first, then the entries it rests on. Chosen by hand from the Copenhagen threads below, not counted out of them.
Two cities that took opposite lessons from the same three ideas: a data marketplace that closed for want of buyers against one the state keeps open, rebuilt streets against live gauges, and heat against power as the thing worth shifting.
Two very unlike cities running the same two programmes: hundreds of small works to deal with rain — Copenhagen to shed it, Los Angeles to keep it — and a lighting retrofit where remote control reached everything, or almost nothing.
The cycling pair, and an honest one: London's docked bike-share is still running while Copenhagen's operator went bankrupt, and each reads its cyclists differently — London with cameras, Copenhagen by timing the lights to their speed.
Every editorial link from Copenhagen's entries into another city, strongest first. Each one is a statement about two projects, not about two cities — the three above are the ones the atlas is willing to make at city level.
1001 Smart Cities (2026). “Smart-city projects in Copenhagen, Denmark.” The Smart City Atlas. https://1001smartcities.org/cities/copenhagen/ (last verified 2026-08-26). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.