Solar Photovoltaic Plant Sigma (Arcos 1, 2, 3, 4 and 5)

The Sigma photovoltaic plant is a solar complex made up of a set of five plants located in the municipality of Jerez de la Frontera (Cádiz). The five installations are called Arco 1, Arco 2, Arco 3, Arco 4 and Arco 5, all promoted by subsidiary companies (Arco Energía 1 SL, Arco Energía 2 SL, etc.), belonging to the Repsol group through its renewable energy subsidiary, Repsol Renovables S.L.U.

Technically, Sigma totals an installed capacity of 204 MWp distributed across the five parks: Arco 1 and Arco 2 with 48.00 MWp each; Arco 3 with 48.70 MWp; and Arco 4 and Arco 5 with 29.45 MWp and 29.54 MWp respectively — for a total of 203.69 MWp according to the official report.

The installations occupy a cadastral area of approximately 694.15 hectares, although the actual area occupied by the parks is smaller: around 362 hectares. Access to the plants is via several regional roads in Cadiz. For example, the Arco 1 and Arco 2 plants are accessed from the CA-3110 road, and the Arco 1 and Arco 3 plants can be accessed from the CA-9017 road. The Arco 4 plot is accessed directly from the CA-9017 road.

Regarding its commissioning, electricity production from the Sigma project began in early 2024: on January 3, 2024, Repsol announced that all five plants were already connected to the grid and in production phase.

The total investment announced for its development is around 150 million euros. It is estimated that Sigma will generate about 430 GWh per year, enough energy to supply approximately 43,000 homes. Additionally, this renewable production would prevent the emission of approximately 191,000 tons of CO₂ per year.