Published by National Geographic: The Brutalist Pirelli building was once voted the ugliest structure in Connecticut. Now the hulking 1970 mid-rise has earned a new superlative: the most energy-efficient hotel in the United States.

It will take a year of measuring the building’s energy production and use before Hotel Marcel can confirm it is truly net-zero. Unlike some certifications that allow hotels to self-certify their efforts, net-zero validation comes from New Building Institute, which will take twelve months of readouts from the solar panels and then make sure the energy created either matches or exceeds the Marcel’s energy bills.

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