Funding and actors

Joint project owners

As the organising authority for sustainable mobility in the Île-de-France region, Île-de-France Mobilités imagines, organises and finances innovative solutions to meet all mobility needs. Attentive to the people of the Ile-de-France region, she works every day to improve their daily journeys. With its skills and expertise, Île-de-France Mobilités is leading the studies for the Metro 1 extension project and is carrying out this preliminary consultation. In this ticket, it ensures the technical and financial coherence of the project and ensures compliance with the programme. It finances 100% of the rolling stock and the operation of the Ile-de-France metro.

Every day, RATP demonstrates its ability to operate, develop, modernise and maintain one of the most efficient multimodal networks (bus, metro, RER, tram), with more than 3 billion journeys per year. It invests and innovates to improve the service provided to passengers. RATP is the operator of metro 1. As the long-standing operator of metro 1 and joint project owner, RATP is putting its industrial and engineering expertise at the service of the extension to Val de Fontenay and this preliminary consultation.

The funders

The project is financed step by step. At this stage, the preliminary studies of the project are financed until the public inquiry and represent an amount of €8.82 million by:

In the Île-de-France region, the State is investing in projects to modernise and develop the existing network. As part of the New Greater Paris project announced by the Prime Minister on 6 March 2013, these projects are coherently linked to the construction of the automatic metro lines on the Grand Paris Express ring road, in particular to meet the transport needs of Ile-de-France residents. As part of the State's participation in the financing of the current studies for the extension of metro line 1 to Val de Fontenay, the Société des Grands Projets (SGP) is responsible for this ticket as part of its additional contributions related to the State-Region Plan Contract 2023-2027.The Société des Grands Projets (SGP), the contracting authority for the Grand Paris Express network, is responsible for the construction of the Val de Fontenay station on the future line 15 East, into which the terminus station of line 1 will be inserted directly (common interchange).

The Île-de-France Region is the leading funder of the development of transport in the Île-de-France region. It contributes to the creation or extension of many lines. His priority: to improve the quality of life of Ile-de-France residents by developing transport from suburb to suburb.

The order of magnitude of the cost of the project, excluding rolling stock, is currently estimated at 1.71 billion euros excluding tax. For the consultation, this indicated cost takes up the order of magnitude established during the 2022 public inquiry, updated to the economic conditions of 2026: it is not at this stage a new estimate, but a benchmark allowing the scale of the project to be located with regard to the current value of prices (constant euros 2026). The final cost will be established during the detailed schematic studies, if the project continues. The cost of the rolling stock is estimated at €130 million excluding constant tax.

The financing of the project will be defined after obtaining the declaration of public utility.

The financing of a transport project and the State/Region plan contracts (CPER)

These contracts are a mode of public management by which the State and the Region commit to multi-year programming and financing around common objectives in terms of regional development. They thus allow for the coherence of public policies in the service of a shared strategic vision at the level of each region. Other partners (local authorities, departments) also contribute to the financing of urban public transport operations. In this context, financing agreements are voted successively as the project progresses, by phase (preliminary studies, design studies, works). The partners and the distribution of funding are decided for each new agreement. To date, a budget of €8.82 million has been allocated to the new phase of studies started in 2025, until the next public inquiry, financed by CPER 70% by the Île-de-France Region and 30% by the State, via the Société des Grands Projets.

The partners

Several institutional partners also contribute to the implementation of the project and are directly involved in the conduct of the studies through numerous meetings (technical committees, monitoring committees, technical meetings, bilateral meetings, etc.).