Booth Brothers is an umbrella business in Barnsley. The mill is a shared workspace of carbon neutral offices, industrial units and hybrid workspace. Over 15 companies are based there, comprising a wide range of commercial activities. The mill is served with a range of renewable energy including solar PV on the roof spaces, wind turbines in the adjoining meadows and hydroelectric generation on the River Don which flows through the site. Winter heating is provided by geothermal heat pumps and a biomass boiler. It has an energy performance certificate of A+ which means ‘carbon negative’.