How does the Saint-Élix-le-Château project demonstrate a model for future power generation despite its small capacity relative to France's largest plant?

The project proves that serious hybrid solar power can be deployed on already degraded spaces without waiting for mega-projects. It combines floating and ground-mounted technologies to utilize artificialized land, avoiding encroachment on agricultural or natural areas.

What are the specific capacity breakdowns for the floating and ground-mounted sections of the 15.4 MWc Saint-Élix-le-Château facility?

The facility allocates 11.3 MWc to floating panels on the water surface and 4.1 MWc to ground-mounted panels on surrounding filled areas. This hybrid configuration makes it one of the few operational mixed-technology plants in France.

What environmental benefits does the floating solar component of the Saint-Élix project offer for water bodies compared to traditional ground-mounted installations?

Floating solar limits water evaporation and reduces the warming of water bodies, which is critical for local ecosystems. It also allows for deployment on sites where ground-mounted installations would be difficult to implement due to terrain constraints.

Only 5% of France's record in New Aquitaine, but this new floating plant already serves as a model for future power generation

In September 2026, a neglected body of water became one of the most original solar power plants in the Southwest!

Saint-Élix-le-Château, located about 40 kilometers from Toulouse, has hosted a photovoltaic power plant unlike any other since this autumn. Driven by Solveo Energies, a French producer based in Fenouillet, the facility combines two technologies on a single site: floating panels on the water of a former alluvial quarry, and ground-mounted panels on the surrounding filled areas. This hybrid project was designed to make use of already artificialized land rather than encroaching on agricultural or natural lands.

Energy & Environment: Saint-Élix-le-Château hybrid solar power plant

The most original power plant in the Southwest

The installation has a total capacity of 15.4 MWc (peak power, meaning the maximum output the panels can deliver under full sunlight). Specifically, 11.3 MWc is deployed on the water surface, while 4.1 MWc is ground-mounted. This combination within a single site makes Saint-Élix one of the few operational hybrid floating/ground-mounted power plants in France.

The expected annual generation is 18.8 GWh, sufficient to cover the average annual electricity consumption of 4,400 households. This is an annual average, not a continuous supply: the sun does not shine on demand, even though the South-West region is one of the sunniest in France.

For reference, the project received authorization in late 2021 and was commissioned in 2026, representing a development period of approximately five years, a standard timeline for this type of infrastructure.

New Aquitaine hides the largest solar power plant

Power plant

Region

Power

Annual production

Household equivalent

Saint-Élix-le-Château

Occitania

15.4 MWc

18.8 GWh

~4,400 households

The Cestas plant, near Bordeaux, remains the largest in France: 300 MWc, covering approximately 260 hectares, and commissioned in 2015. Saint-Élix represents only 5% of its capacity. This is therefore a medium-to-large-scale project, solid at the local level, but with no ambition to break records.

A respectable standing in Occitanie

In Occitania, Saint-Élix outperforms several recent solar farms: it produces 1.7 times more than the Laissac-Sévérac-l’Église plant (10.9 GWh/year) and 2.6 times more than La Couvertoirade (7.1 GWh/year). However, compared to the future regional record, the ratio reverses dramatically.

The Roujanel plateau in Lozère will be commissioned between late 2026 and early 2027. With a capacity of 129 MWc and an estimated annual production of 177–181 GWh, it will become the largest solar farm in Occitania and the third largest in France.

Occitania is one of four French regions that have surpassed 1 GW of installed solar capacity, alongside Nouvelle-Aquitaine, Auvergne-Rhône-Alpes, and Provence-Alpes-Côte d’Azur (PACA). These four regions account for more than 72% of France’s photovoltaic capacity. In 2023, the region’s solar production had already reached 21.6 TWh, a 17% year-on-year increase. This is extremely promising at a time when energy production sovereignty is a key concern for France.

A positive sign for a neglected location

Saint-Élix illustrates a broader trend: repurposing industrial wastelands and former quarries into renewable energy production sites. The good news is that here, there is no deforestation, no new land artificialization… just an unused plot of land being put back to work.

This model is attracting growing interest from local authorities and developers, particularly because it shortens the timeline for local acceptance and simplifies administrative procedures. Floating solar, in particular, limits water evaporation, reduces the warming of water bodies, and can be adapted to sites where ground-mounted installations would be difficult.

The value of Saint-Élix lies not in its raw figures, but in what it demonstrates: it is possible to deploy serious, hybrid solar power on already degraded spaces without waiting for a mega-project to make it count!