Ecoenergies Barcelona Sud would capture the cooling by running pipes filled with a thermal liquid similar to antifreeze near the L.N.G. pipes. The thermal liquid would absorb the cooling and convey it through a series of linked circuits to a nearby facility, where it would be stored as ice.

Clients could tap that cold store for air-conditioning and other industrial processes — and, possibly, for applications like year-round winter sports.

That is the hope of B01 Arquitectes, a firm in Barcelona that promotes sustainable building. Three years ago, when the architects heard that a Dutch company called SnowWorld, which builds indoor ski facilities, was looking for a site in Barcelona, they pitched the idea of using the harbor project as an eco-friendly way of producing ice and snow.

“It is already a difficult thing in Holland, both from the economic and ecological point of view, to maintain a hall at minus 6 degrees Celsius all year, so you can imagine that in the climate of Barcelona how much bigger a challenge that becomes,” said Sander Laudy, the architect at B01 who devised the project.

For SnowWorld, which already operates two large indoor ski facilities in the Netherlands, the project would be the most significant step it has taken to improve the environmental credentials of indoor skiing. SnowWorld already reduces its energy use by recovering heat from snowmaking equipment at one of its sites, in Landgraaf. The heat is then recycled for water and for use in radiators at a nearby restaurant and hotel. The company also buys power from utilities that supply electricity from sources like wind.

Ski Dubai, operated by Majid Al Futtaim Properties, has also sought to save energy with efficient cooling and insulation — as in walls that are 5 meters, or 16.4 feet, thick — and by recycling snow and using meltwater for air-conditioning, according to its Web site.

But the facility in Barcelona would be considered “carbon-neutral” because the harbor would provide the cooling, while solar panels would offset the electricity used for lighting and needed to run the machinery, said Wim Moerman, the chief financial officer for SnowWorld.