On the 19th of October at 2:29 pm, the breaking of the connection of current transformer associated with the 345 kV busbar breaker of substation Samambaia caused an imbalance between supply and load on 345 kV busbars, resulting in the shutdown of various equipment and transmission lines of substation Samambaia, causing load cuts totaling 300 MW.

Main actions and measures implemented:

• Incorporation of part of 138 kV transmission system of Brasilia area to the Operation Grid, aiming to expand the area of ​​ ONS operation in the electrical system of 138 kV in this region.
• Establishment of operating procedures involving all lines and substations of the transmission system 138 kV of the area Brasília which have merged into the Grid Operation.