Greenfield projects

From an engineering point of view, these are projects to be developed on sites that have not had previous industrial use or significant buildings.
From an investor perspective, they are project investments that relate to a PPP that has recently been awarded or is under construction, and where there are significant new structures or very significant upgrades of existing infrastructures. In the latter case, depending on how relevant the value of the existing infrastructure is, greenfield projects may be also defined as yellowfield or secondary stage projects.