Copenhagen City Data Exchange — A Cautionary Tale in Municipal Data Marketplaces

In May 2016 the City of Copenhagen, the Capital Region of Denmark and Hitachi (via Hitachi Consulting/Hitachi Vantara) launched the City Data Exchange (CDE), promoted as the world's first data marketplace built specifically for cities.

To let public bodies, utilities, universities and private firms buy, sell or freely publish datasets spanning energy, transport, environment and more, on the premise that pooling 'big data' would unlock new smart-city innovation.

Within days of launch the platform listed around 56 datasets, growing over time to a mix of roughly two dozen paid datasets alongside over a hundred openly published ones.

The project was discontinued in 2018, after just two years of live operation, because it never attracted enough data providers and buyers to become commercially self-sustaining.

Reporting on the shutdown found three recurring problems: participants struggled to find the specific data they needed even with active matchmaking support; there were too few compelling proven use cases to convince new providers to join; and some data holders held back over privacy, public-perception and competitive concerns even though the shared data was anonymised and aggregated. Marius Sylvestersen, Copenhagen's Smart City Programme Director at the time, later summarised the core misjudgement: the project treated data-pooling itself as the goal ('big data thinking') rather than starting from a specific civic problem the city needed to solve.