A police statement said that Bradley Watts from Manningtree, Essex, who was working on the site as a contractor, died when he touched a live wire at the factory - which produces fresh salad and fruit products - during the early afternoon on June 2.
Emergency services were called to the scene, but paramedics were unable to revive Watts, who was pronounced dead at the scene.
Watts' mother said: "I am devastated by the untimely death of my son, Bradley. He was a wonderful person and will be greatly missed by all his family and friends."
Sussex Police said that they continued to assist the Health and Safety Executive (HSE) with their investigation into the incident, which occurred when Watts was working in the factory roof space.
Susan Barratt, ceo, Natures Way Foods said: "Very regrettably a fatal industrial incident occurred at our Runcton site ... Our thoughts are very much with his [Watts'] family at this very difficult time. We are now working with the Police and the HSE to determine the cause of the incident as quickly as possible."