Opposite of Brownfield. It describes a new project or facility built from scratch, on a metaphorical “green field” with no constraints from legacy equipment. A greenfield ICS deployment can design security and modern architectures in from the start (a luxury not always present in brownfield sites). For example, a brand-new factory with all new control systems and network infrastructure is a greenfield deployment, and the engineers have free rein to choose the latest technologies and best practices.
