en.Wedoany.com Reported - Twenty-five cities in Bahia experienced a power outage on the morning of June 11, caused by a bus short circuit at the Governador Mangabeira 230 kV substation, operated by Axia Energia.

At the time of the incident, two outsourced employees were performing routine maintenance at the substation. The bus short circuit triggered automatic tripping at the Governador Mangabeira and Tomba 230 kV substations, as well as the Pedra do Cavalo hydroelectric plant (160 MW), leading distribution company Neoenergia Coelba to interrupt 180 MW of load—140 MW at the Tomba substation and 40 MW at the Governador Mangabeira substation—affecting power supply to 25 cities in the Feira de Santana region.

The two employees involved were taken to a hospital, where one died despite rescue efforts. The cause of the bus short circuit is under investigation.

According to information from the National Electric System Operator (ONS), 230 kV transmission lines and transformers operated by Axia Energia and Afluente Transmissão de Energia (controlled by Neoenergia) were affected. Based on the ONS's Daily Preliminary Operation Report (IPDO), the automatic tripping occurred at 9:04 a.m. Load restoration began at 9:05 a.m. through the distribution network, with 51 MW of load transferred by 10:05 a.m. Equipment restoration started at 10:47 a.m. and was fully completed by 11:37 a.m.

Equipment affected by the tripping includes: LT 230 kV Sapeaçu / Governador Mangabeira C1, C2, and C3 (Axia Nordeste); LT 230 kV Catu / Governador Mangabeira C1 (Axia Nordeste); LT 230 kV Governador Mangabeira / Tomba C1 and C2 (Afluente); LT 230 kV Feira de Santana III / Governador Mangabeira C1 (Axia Nordeste); LT 230 kV Camaçari II / Governador Mangabeira C1 (Axia Nordeste); LT 230 kV Governador Mangabeira / UHE Pedra do Cavalo C1 (Votorantim Cimentos); Governador Mangabeira substation 230/69 kV 100 MVA TR1 and TR2 transformers (Axia Nordeste); Tomba substation 230/69 kV 100 MVA TR1, TR2, TR3, and TR3 transformers (Afluente).

According to Neoenergia Coelba, the affected municipalities include: Água Fria, Amélia Rodrigues, Anguera, Antonio Cardoso, Cabaceiras do Paraguaçu, Cachoeira, Castro Alves, Conceição de Feira, Coração de Maria, Cruz das Almas, Feira de Santana, Governador Mangabeira, Ipecaetá, Irará, Muritiba, Ouriçangas, Pedrão, Salinas das Masgaridas, Santa Terezinha, Santo Estevão, São Felipe, São Felix, São Gonçalo dos Campos, Sapeaçu, Serra Preta.

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