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Navigating France’s Solar Power Grid: What Developers Need To Know

Published: 18. Mar. 2024
Navigating France’s Solar Power Grid: What Developers Need To Know

Updated 2023

The power grid plays a crucial role as the world shifts towards renewable energy, but what are the obstacles in this transition?

At the heart of the energy transition sits the power grid. The grid is the largest industrial investment in human history and its importance continues to grow as we embark on a mission to electrify the world. Slow interconnection approvals are a near-universal issue facing renewable energy developers and threaten our mission to decarbonize and deploy renewable capacity. In the US, the Federal Energy Regulatory Committee (FERC) has introduced reforms to improve the transparency and accountability of the process of interconnection. European markets differ in terms of the level of transparency for permitting and achieving grid connectivity.

As we work to support our customers across Europe, it is crucial that we at Glint Solar have a deep understanding of the challenges, opportunities, and market shifts in the region. This piece will focus on one of Europe's key solar markets, France. We provide an insight into the process of connecting a new power asset to the grid and some of the key challenges. At Glint Solar, we are always looking for ways to improve visibility into grid matters for our customers and helping them plan around potential adversities and guide the decision-making process.

After the summer of droughts, heat waves, and fires, Emmanuel Macron made a pledge to halve the time it takes to get a renewable energy project off the ground in France. Allowing for more capacity, faster. However, the staggering amount of renewable energy (wind & solar) that is expected to come online means that interconnectivity will be a major impediment to scaling the sector, as the pace of renewable development tends to exceed the pace of improvements of transmission. Policymakers need to judge whether grid development plans are in line with ambitious renewable energy targets to ensure transmission capacity does not constrain the energy transition.

The grid remains poorly understood, at the very time when it needs to change significantly to keep pace with climate change, new energy policies, and consumer behavior. The transmission grid is an interconnected electrical system that transports electricity from generating sources to distribution systems, in other words, it is a linear infrastructure system that transports high-voltage electricity over great distances.

Countries in Europe are linked together through this system. It also connects power sources such as nuclear plants, solar parks, and hydropower plants. These power sources are then distributed to factories and some local users through distribution networks. Transmission networks are then divided into categories of voltage, with higher voltage transmission networks (400 kV, 225 kV) and sub-transmission networks (63 kV, 90 kV). In France, the Transmission System Operator (TSO) is RTE. The Commission de régulation de l’énergie (CRE) regulates the six Distribution System Operators (DSO), of which Enedis (DSO) serves 95% of France.

The process of connecting with the grid

In France, all grid operators (DSOs and TSOs) must provide access to the network to all users and producers in a non-discriminatory manner (Code de l’ ́energie, 2022a). The French law states there is no priority for the connection of renewable energy capacity, unlike its neighboring country Germany, which endorses the priority connection of renewables. At Glint Solar, we believe endorsing priority connections for renewables is key to aligning the growth of the renewable energy pipeline with transmission capacity.

France's lack of emphasis on renewable energy connecting to the grid can be seen as a concern. This is especially true when compared to its neighbors. The main worry is ensuring a secure energy supply. France has pushed back its aims to scale down nuclear energy by 50% until 2035, postponing the urgency to connect renewable energy supply.

Solar energy developers installing new power plants must submit a connection request to grid operators. Then, you are placed in a capacity reservation system known as "File d’attente” (the interconnection queue). RTE classifies connection requests according to a "first come, first served" priority of processing. The grid operator thereafter conducts a technical connection study (RTE has three months to do this). This document is known as the PEFA, and once signed, the project is added to the queue.

The process involves requesting a technical and financial proposal (PTF), which outlines the project's scope, costs, and timelines. RTE commits to this quote and typically has three months to respond. If accepted, a connection agreement is signed, specifying technical, legal, and financial terms, as well as plant conditions. RTE keeps developers updated on connection progress and notifies them when it's available.

Source: RTE

Costs involved in connecting to the grid for developers

To connect new power plants to the distribution grid, producers pay for the installation of meters, circuit breakers, cables, etc. As well as costs of the network extension, addition of transformers, and any modification of the network if necessary. For the connection to the transmission grid, the producers pay a share of the costs calculated per region and in Euros per MW. The uncertainty of costs and the opacity of the process is cited as one of the largest challenges for developers.

To obtain a cost estimation, developers must send a connection request to the DSO. Requests must be completed with several technical and administrative documents, such as certificates of compliance with local urban planning regulations. Often, if costs outweigh the expected return of a project, developers will abandon the project despite prolonged preparatory work, which often exceeds one year. Time cost is stressed as a major impediment to developing new power projects. Enedis, the quasi-monopolistic DSO, acknowledges that connection requests can sometimes extend beyond one year and has committed to cutting this time in half.

There are EU-level schemes (REPowerEU) that stress the need for member states to ease and accelerate the permitting process for renewable energy projects through spatial planning and greater and more efficient contact points.

Working with Enedis to connect to the power grid

For utility-scale projects, Enedis provides a contact person for the grid connection process and follows on relations thereafter. Many developers often cite friction with Enedis as a major challenge in developing PV assets in France, given its centralized and quasi-monopolistic nature. Often, Enedis’ choice of technical solutions entails additional costs and their calculations are often opaque with no alternatives provided most of the time.

Another challenge for developers is the concept of a first come first served principle for the connection. It entails changing prices depending on the state of the grid, capacity, and the project’s place in the queue. Understanding the landscape of projects in the pipeline and sharing costs between developers could be a solution - Enedis recognizes that but has a duty of non-discrimination and data/project confidentiality that prevents it from revealing competing project locations and details. DSOs are not allowed to perform competitive activities, hence any consulting on evaluating different connection possibilities and cost optimization studies might be seen as a violation by the regulators.


RTE’s 15-year plan for the grid and transmission upgrades

RTE (Réseau de transport d'électricité) has a 15-year plan to modernize the French grid, adapt it for greater renewable capacity and expand the reach of the network, both with cross-border interconnection and with offshore lines. The plan outlined is valued at EUR 33bn over the 15-year horizon, with EUR 13bn earmarked for transmission grid adaptations, EUR 8bn to replace old infrastructure, EUR 7bn for marine initiatives, EUR 3bn for digital and EUR 3bn for cross border interconnection. The program is financed by TURPE (the tariff system) and by the share paid by the producers under the regional renewable energy connection programs.

Developing interconnections across the European continent has been one of the mainstay energy policies - enhanced security, greater electrification, and better consumer prices. Currently, France’s ambition is to have 30 GW of interconnection capacity by 2035.

Examples of transmission projects in the works:

France and Spain have only three high voltage interconnection lines planned, to be delivered by 2027. One of the projects is a 400-kilometer link that will run between the Cubnezais substation (near Bordeaux, France) and the Gatika substation (near Bilbao, Spain) and it will be the first submarine interconnector between Spain and France. The project has a total transmission capacity of 2 GW and will lift the total interconnection capacity between the two countries to 5 GW. 5 GW of transmission capacity will be able to interchange roughly 40 TWh per year if used at very high utilization factors. This seems like a substantial amount, however, it is a small number compared to the total power demand in both countries, hence begs the question: With lead times of 10 years for such projects, are we being ambitious enough? We can’t afford to misjudge the scale of the grid developments required and thus create bottlenecks for the energy transition.

Stop spending days to assess the impact of your solar projects on the grid

At Glint Solar, we see France as one of the key markets for solar developers in Europe with strong ambitions to grow and a lot of potential for accelerated PV development. Glint Solar helps developers more accurately assess the potential impact of their projects on the grid and take steps to ensure that necessary infrastructure is in place to support them.

This could potentially help avoid bottlenecks and facilitate a smoother transition to renewable energy sources. Glint Solar brings value to the market in France by enabling more efficient and effective planning for renewable energy projects. We keep adding new features to make things smoother. We're excited about what's coming in 2023 and how we can help you. Book a free demo of France in the Glint Solar software.


In summary, France's solar grid poses challenges for developers due to its 'first come, first served' approach and opaque cost estimates. However, RTE's 15-year plan offers hope for grid modernization and increased interconnection capacity. Glint Solar is helping developers by providing tools to assess grid impact and avoid bottlenecks. France's renewable energy targets remain ambitious, and efficient planning is key to achieving them in 2023 and beyond.

Useful links for our developers entering France:

Various information and guidelines according to RTE:


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