As per the utility management team (or shop floor team), Stora Enso Hagen has cut the cost of generating compressed air by 30 percent. Taking all necessary conversion measures into account, the entire investment has been amortized in just one year.At its Hagen site, Stora Enso produces almost half a million tons of paper per year. Close to 170,000 cubic meters of compressed air have to be generated every day to operate the paper machines, calendars, winders and cutters. Five compressors supply the internal compressed air system and cover the highly fluctuating demand, which at peak times can rise rapidly by up to 5,000 cubic meters per hour.In 2010, the company decided to optimize its compressed air system and installed an central controller, as well as a compressor from Atlas Copco.The ES 130 T controls several compressor sizes and types from various manufacturers. The system tests, stores and analyzes to ensure that the most suitable compressors are activated. As a result, the output of the five connected machines is geared, in terms of overall energy, towards achieving the optimum operating point and is continuously adjusted to meet the demand.Once the central controller and VSD compressor had been installed, Stora Ensa's energy consumption fell by 30 percent. As a result, the company's entire investment has been amortized within one year.