A power plant with another public life.

Published 21 October 2026 · WHV · Public-source editorial note

An industrial roof normally completes a building and asks for little public attention. At CopenHill in Copenhagen, it becomes terrain. People can walk upwards or ski on an artificial surface while a waste-to-energy plant continues working beneath them. One piece of infrastructure carries two very different kinds of activity.

The roof has another job

BIG’s account connects the roof’s geometry to the arrangement of machinery inside the plant. The project turns that technical volume into a ski slope, walking landscape and climbing destination. CopenHill officially opened in October 2019. Its continuing interest is not simply that the building resembles a mountain, but that the resemblance supports an actual public programme.

This is an unusually direct invitation to ask what infrastructure can give a city beyond its primary service. A view, a path and an active rooftop can be meaningful additions to an industrial district. That architectural argument is distinct from proving that incinerating waste is carbon neutral or that a recreational roof resolves the plant’s environmental trade-offs.

Separate a good place from a universal green claim

Check the relevant activity and current opening hours before going. The operator distinguishes walking and café access from skiing, and warns that maintenance or private events can affect access. Walkers and skiers do not necessarily follow the same timetable or booking route. The useful discovery is a design question that travels beyond Copenhagen: which apparently single-purpose places could support another form of public life?

Source and context.

BIG: CopenHill, machinery, roof geometry and public programme ↗

CopenHill: opening history and visitor questions ↗

CopenHill: current opening hours and maintenance restrictions ↗

The photograph shows the actual plant in August 2026, not a guarantee that the roof is open today. The story concerns architectural and public-use value. No net-zero, carbon-neutrality or investment-performance claim is made for waste incineration.

Source checked 21 October 2026. WHV interpretation is distinct from the source’s account.