The Île-de-France region is at the heart of the Paris Basin, a sedimentary basin with the largest sedimentary basin storage capacities in France, mainly in saline aquifers and to a lesser extent in depleted hydrocarbon fields. The French government will be setting up support strategies and incentives for manufacturers to implement CCUS, as the additional costs of CO₂ capture are generally not yet integrated into industrial business models.

In 2019, around 5.5 Mt of CO₂ were emitted by more than 40 sites scattered across the Île-de-France region, most of them small emitters, which represents a challenge for implementing CO₂ capture. Only 6 sites emit more than 350 kt of CO₂ per year: the Grandpuits refinery (541 kt/year), the Grandpuits fertilizer plant (646 kt/year), the waste-to-energy plants (Ivry: 572 kt/year; Saint-Ouen: 416 kt/year; Issy-les-Moulineaux: 384 kt/year) and two heat recovery facilities in Saint-Ouen (522 kt/year). A case study (Strategy CCUS project) focused on these waste-to-energy plants, which must also meet national and European waste reduction targets. However, the technical feasibility of building a capture plant in dense urban areas remains a problem (land availability and plant footprint), as does the absence (to date) of economic incentives to make CCUS operations profitable.

Another case study (PilotSTRATEGY project) focuses on the Grandpuits fertilizer plant, targeting storage in a saline aquifer (Dogger formation). The prerequisite for a pilot project is a better understanding of the subsurface, which has led to the launch of a 3D seismic campaign in 2022. The French government, aware of the need to gain a better understanding of the subsoil in order to carry out CO₂ storage operations, will be launching a 3D seismic campaign in 2024, to supplement the knowledge gained from geothermal operations and past or current hydrocarbon exploitations. In the shorter term (E-CO₂ project in Le Havre), capture facilities scheduled to be operational as early as 2027 plan to transport captured CO₂ to offshore storage facilities (North Sea), by ship, with land connections between several CO₂-producing sites provided by pipelines, which will need to be converted for CO₂ transport. This hub-based interconnection of several emitting sites optimizes transport costs, although the cost of capture remains high, particularly for small emitters. Some operators are turning to CO₂ storage strategies coupled with other technologies, in particular geothermal energy, as in the case of the project under consideration for the injection of dissolved CO₂ and the exploitation of heat by geothermal doublet for the new waste-to-energy plant at Ivry. This makes it possible to optimize the energy demand for capture, and thus undoubtedly improve the financial closure of such an operation.