Clean sweep for robot in smart city Helsinki Finland is burnishing its credentials as a smart city of innovation with a novel pilot project of robot street cleaners. Starting from 19 April, residents of the Finnish capital’s Jätkäsaari quarter can see the automated Trombia Free street sweeper in action as it is tested on a pilot scheme as part of the Jätkäsaari Mobility Lab, a project co-coordinated by Forum Virium Helsinki and the The designers claim Trombia Free is the world’s first fully powered, electric and autonomous street sweeper and consumes only 15% of the energy required by conventional brushing vacuum cleaning machines. Neither does it generate emissions in the cleaning situation. The sweeper is about the size of a small passenger car.