🧱 The old Nantucket Electric Company building that had stood for nearly a century along the downtown waterfront was demolished Thursday. An excavator operated by Costello Construction, working on behalf of the utility giant National Grid, which owns the property, took the structure down in less than an hour. The demolition of the brick building, one of the last vestiges of the era when Nantucket produced its own electricity from a power plant on New Whale Street, had been debated for more than