System for at least one industrial activity (u1 - un) on at least one onshore or offshore location which use as feedstock and/or produce at least one of gas, crude oil, refined hydrocarbon components or products, where the at least one industrial activity is represented by combinations of at least one hydrocarbon producing installation, at least one distillation unit, at least one upgrading unit, oil refinery, combined cycle electric power plant, production of heat, production of steam, production of at least one fertilizer or production of at least one petrochemical product, - where the system is arranged for controlling an installation and for handling fume gas from the installation and a network, where the installation comprises several sub-systems (1, 5, 8), where the installation is part of the network which comprises the at least one industrial activity (u1-un) located onshore or offshore and fume transportation from the network, and - where the system comprises at least one pipeline or electric power grid for the transportation of fume gas or industrial products to or from said installation from at least one of a) other industrial activity offshore, b) other industrial activity onshore, c) a vessel or mobile unit, for the reinjection of the fume gas via at least one riser structure, and an integrating control and guidance system comprising at least one central processing unit and sensors for guiding at least the industrial activity of the sub-systems (1, 5, 8), where the integrating control and guidance system interconnects the subsystems (1, 5, 8) via the sensors, wherein the installation comprises: - hydrocarbon feedstock from a mobile unit, from storage facilities, from a pipeline or from underground reservoir(s) or well(s), and - an industrial activity for producing a petrochemical product, heat, steam, fertilizer or cement, and - a storage facility into which fume gas from the industrial activity can be injected, - at least one riser structure for leading the fume gas from the industrial activity to the storage facility, and wherein the integrating control and guidance system is configured to, in real time: - measure a demand for the industrial activity, - measure a demand for supply of fume gas from the network, - provide the feedstock from said mobile unit, storage facilities, pipeline, or reservoir(s) or well(s) to fuel the industrial activity, and - control and monitor the injection of fume gas from the industrial activity to the storage facility in real time. - where the system is arranged for controlling an installation and for handling fume gas from the installation and a network, where the installation comprises several sub-systems (1, 5, 8), where the installation is part of the network which comprises the at least one industrial activity (u1-un) located onshore or offshore and fume transportation from the network, and - where the system comprises at least one pipeline or electric power grid for the transportation of fume gas or industrial products to or from said installation from at least one of a) other industrial activity offshore, b) other industrial activity onshore, c) a vessel or mobile unit, for the reinjection of the fume gas via at least one riser structure, and an integrating control and guidance system comprising at least one central processing unit and sensors for guiding at least the industrial activity of the sub-systems (1, 5, 8), where the integrating control and guidance system interconnects the subsystems (1, 5, 8) via the sensors, wherein the installation comprises: - hydrocarbon feedstock from a mobile unit, from storage facilities, from a pipeline or from underground reservoir(s) or well(s), and - an industrial activity for producing a petrochemical product, heat, steam, fertilizer or cement, and - a storage facility into which fume gas from the industrial activity can be injected, - at least one riser structure for leading the fume gas from the industrial activity to the storage facility, and wherein the integrating control and guidance system is configured to, in real time: - measure a demand for the industrial activity, - measure a demand for supply of fume gas from the network, - provide the feedstock from said mobile unit, storage facilities, pipeline, or reservoir(s) or well(s) to fuel the industrial activity, and - control and monitor the injection of fume gas from the industrial activity to the storage facility in real time.