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Enel Challenges Brazilian Regulator to Halt São Paulo Concession Review
Italian energy company Enel has filed a final defense with Brazil’s power regulator, Aneel, urging it to cancel a review that could lead to the termination of its crucial São Paulo distribution concession. Enel contends the regulator has not adequately analyzed the potential impact on consumers and has overlooked improvements in service quality.
Enel's Arguments
In its filing, which Aneel confirmed it received on Thursday, Enel argues that it has met the two official service-quality metrics that could be used as grounds for a termination recommendation. The company is pushing back against the regulator's findings, which were heavily influenced by widespread power outages during extreme weather events.
Enel's key points include:
- The regulator is allegedly ignoring performance improvements made since 2023.
- An event in December 2025 that caused significant outages was "unprecedented and extraordinary."
- The company has repeated its request for an independent technical audit, a proposal Aneel rejected in August.
Regulator's Stance and Background
AdThe regulatory review stems from Aneel's prior determination that Enel’s São Paulo distribution unit suffers from structural failures. This conclusion was based on poor performance during severe weather events in 2023, 2024, and 2025, which left millions of customers without power for extended periods.
This filing represents Enel's final opportunity to present its case before Aneel decides whether to recommend that the federal government terminate the concession. The regulator's board members had previously criticized Enel's proposal for an independent audit before formally rejecting it.
What's at Stake
The dispute places the future of a major utility concession in one of South America's largest metropolitan areas in jeopardy. For investors, the outcome will be a key indicator of the regulatory environment in Brazil and the stability of long-term infrastructure contracts. The federal government will have the final say based on Aneel's ultimate recommendation.
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