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High voltage electric corridor between Paraná and Santa Catarina received reinforcement monitored by official agencies, with new sections in operation, strategic equipment in the National Interconnected System, and direct impact on energy transmission in northern Santa Catarina and the Itajaí Valley.
The Brazilian electric system incorporated in March 2026 two new transmission sections at 525 kV between Paraná and Santa Catarina, highlighting the Areia/Joinville Sul line, noted by the minutes of the 317th CMSE meeting with an addition of 292 kilometers.
Also recorded by the same document, the Joinville Sul/Itajaí 2 section, located in Santa Catarina, added 82 kilometers to the transmission network and became part of the set of works monitored in the official monitoring of electrical expansion.
During the analysis of generation and transmission expansion, the National Electric Energy Agency informed the Electric Sector Monitoring Committee that the country added, in March 2026, 1,114 MW of centralized generation, 374 kilometers of lines, and 1,491 MVA of transformation.
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Reinforcement in the Santa Catarina electric system
In the daily record of the National Electric System Operator of March 8, 2026, the integration of the equipment appears linked to Neoenergia Vale do Itajaí Transmissão de Energia S.A., identified as the asset owner agent.
According to the ONS, the insertion of the lines and other equipment of the Joinville Sul substation improves service to the Santa Catarina market in the medium and long term, especially in the North and Itajaí Valley regions.
Although they deal with the same sections, the official records present different extensions for the lines, as the CMSE minutes mention 292 kilometers and 82 kilometers, while the ONS monitoring reports 278 kilometers and 77.3 kilometers.
This difference in measurement does not alter the central point of the expansion recorded by the electric sector, as the two sections connect strategic points of the extra-high voltage network and become part of a relevant arrangement for Santa Catarina.
Based on the available official documentation, the entry of assets into the National Interconnected System was recorded in March 2026, within the set of projects monitored by the agencies responsible for the operation and expansion of the network.
525 kV Line Expands Transmission Capacity
Structures at 525 kV are used in large-scale transmission systems, aimed at transporting energy over long distances and connecting strategic substations that support the electrical flow between regions.
In this case, the reinforcement mentioned by the CMSE is associated with the recent expansion of the network and the monitoring of commercial operation dates of generation and transmission projects at different points in the country.
Without directly producing energy, transmission defines the ability to deliver electricity from generation areas to consumption centers and makes it possible to redistribute flows when the system operation requires more flexibility.
Involving regions with growing demand and the need for greater operational reliability, the entry of new circuits and transformers is usually closely monitored by technical bodies in the electricity sector.
In the ONS report, the expected improvement in service to the Santa Catarina market is directly cited for the North of the state and the Itajaí Valley, areas connected to the new set of assets.
This indication reinforces the importance of the Joinville Sul/Areia line, the Itajaí 2/Joinville Sul line, and the equipment associated with the Joinville Sul substation within the regional transmission planning.
Expansion Includes Transformers in Different States
In addition to the new transmission lines, the CMSE minutes record the entry into operation of transformers in Ceará, Maranhão, Rio Grande do Sul, and Santa Catarina, with equipment installed in strategic substations of the network.
Among the reported assets are two 150 MVA transformers at the Crato II substation, units of 100 MVA and 450 MVA at the Santa Luzia III substation, and equipment of 75 MVA in Rio Grande do Sul.
In Santa Catarina, the document also records a 120 MVA transformer at the Jorge Lacerda A substation, within the same expansion balance monitored by the Electricity Sector Monitoring Committee.
Added to the extra-high voltage lines, these pieces of equipment show that the network expansion depends on interdependent works, in which substations, transformers, reactors, and circuits need to operate compatibly.
For a line of this size to enter operation safely, integration into the National Interconnected System requires adjusted technical parameters, operational tests, and coordinated connection between the different assets that make up the electrical grid.
CMSE Monitoring Follows Transmission Works
Held on April 8, 2026, the 317th regular meeting of the CMSE brought together representatives from the Ministry of Mines and Energy, ONS, ANEEL, CCEE, EPE, and other institutions linked to the electricity sector.
Electronically signed on May 4, 2026, the minutes bear the endorsement of the national secretary of Electric Energy, João Daniel de Andrade Cascalho, responsible for the formal record of the committee’s deliberations.
In the same meeting, the CMSE approved the trend dates for the commercial operation of generation and transmission projects, according to the 3rd Monthly Monitoring Meeting of the Expansion of Generation and Transmission Supply of 2026.
This monitoring shows that the expansion of the electrical grid is part of the ongoing planning of national energy security, focusing on the coordinated entry of works capable of reinforcing the system.
For the consumer, transmission works almost never appear visibly, but they influence the system’s ability to serve industrial, urban, and logistical areas with greater operational stability.
By integrating the Areia/Joinville Sul and Joinville Sul/Itajaí 2 sections, the high-voltage corridor monitored by official bodies plays a significant role in serving northern Santa Catarina and the Itajaí Valley.
