The underground transmission line of the Riacho Grande project by the concessionaire ISA Energia Brasil, in the Metropolitan Region of São Paulo, was inaugurated this Thursday (March 26), considered by the concessionaire to be the largest of its kind in the country, with a length of 44,6 km.
The project represents an investment of R$ 1,1 billion, has an installed capacity of 800 MVA, and the potential to serve more than 2 million people. The initiative also includes 9 km of overhead lines and three 400 MVA transformers each.
According to the concessionaire, the project includes the construction of the São Caetano do Sul Substation, with 11,8 m² of built area and GIS (Gas-Insulated Switchgear) technology, which allows for a reduction of up to 75% in the space required for installation, a relevant feature in urban areas.
The unit has three identical transformers, each with a capacity of 400 MVA, designed to operate quietly even under maximum load. Two units operate continuously, while the third remains as a strategic backup, increasing safety and operational flexibility.
According to ISA Energia Brasil, the new infrastructure will allow for a connection between the city of São Paulo and the ABC region, facilitating the flow of energy from the Itaipu hydroelectric plant and contributing to meeting the growing demand for electricity.
“The Riacho Grande Project synthesizes the capacity of Brazilian engineering to enable complex solutions in dense urban environments, with a high level of technology and respect for the surroundings, with operational efficiency and the generation of value for society, guaranteeing greater safety and robustness to the electrical system,” stated Dayron Urrego, Executive Director of Projects at ISA ENERGIA BRASIL.
The project involved technologies aimed at reducing urban impacts, including real-time cable monitoring systems and the use of drones for launching structures.
The project also included the construction of a 120-meter-high, 100-ton transmission tower near the Billings Reservoir, as well as the expansion of existing substations.
During its execution, the project generated approximately 2.200 direct and indirect jobs and incorporated socio-environmental initiatives, such as environmental education programs and support for community projects in the region.
The delivery was presented at an event held at the São Caetano do Sul Substation (SP), with the presence of representatives from the electricity sector, such as the ONS (National System Operator) and the MME (Ministry of Mines and Energy).
“This infrastructure directly contributes to mitigating operational risks, expands the capacity to meet growing demand, and strengthens the system's resilience in the face of extreme weather events,” said Márcio Rea, Director-General of ONS.
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