By Brazil Stock Guide – Brazil’s power regulator, the Agência Nacional de Energia Elétrica, approved new annual electricity tariffs for two of the main distributors serving Rio de Janeiro state on Tuesday (Mar. 10), producing markedly different outcomes for the companies. Tariffs for Enel Distribuição Rio will increase 15.46% on average, while those for Light S.A. will rise 8.59%, with both adjustments taking effect on March 15, 2026.
For Enel Rio, the increase will be heavier for large industrial and commercial users connected to the high-voltage grid, whose tariffs will rise 19.94% on average, while residential and small-business customers connected to low voltage will see an average increase of 14.23%. In the Light concession area, the increases will average 13.46% for high-voltage customers and 6.56% for low-voltage users. After the adjustment, the typical residential tariff in Enel Rio’s service area will exceed R$ 1,061 per megawatt-hour, compared with roughly R$ 880 per megawatt-hour in Light’s distribution network.
Costs Beyond Utilities’ Control
Much of the increase reflects costs that distributors themselves do not directly control, known in Brazil’s regulatory framework as “Parcel A” costs. These include energy purchases, sectoral charges, and payments for the use of transmission infrastructure.
For Light, these components alone contributed about 7.12 percentage points to the tariff adjustment. A key driver was the Conta de Desenvolvimento Energético (CDE), a nationwide fund used to finance public policy subsidies in the electricity sector, including social tariffs and regional energy programs.
Enel Rio faced similar pressures, but its adjustment was amplified by the removal of temporary financial components that had reduced tariffs in the previous cycle. Once those temporary factors expired, the regulatory reset resulted in a sharper increase for consumers.
Tax Credits at the Center of the Decision
The biggest difference between the two tariff reviews came from how the regulator treated PIS/Cofins tax credits—payments that utilities previously made in excess and must return to consumers through tariff reductions.
For Light, ANEEL decided to recognize only part of the tax credits proposed by the agency’s technical staff. Instead of the roughly R$ 1.65 billion initially suggested for reimbursement to consumers, the regulator approved the return of about R$ 1.04 billion in this tariff cycle.
Regulators said the decision was designed to avoid creating a future “tariff rebound” if Brazil’s tax authority ultimately confirms that the company’s eligible credits are lower than previously estimated.
The case is particularly sensitive because the tax authority has already audited part of Light’s claims and determined that the credits formally recognized may be smaller than the amounts already compensated by the company. If the regulator were to return all credits immediately and the tax authority later upheld its interpretation, tariffs might need to rise sharply in a future cycle to reverse the difference.
For Enel Rio, by contrast, ANEEL opted for a more aggressive return of credits to consumers, reflecting the company’s different stage in the tax-credit process and the regulator’s concern that unused credits could expire due to statutory deadlines.
Utilities Await Concession Renewal
The tariff decisions come at a sensitive moment for both distributors, as their operating concessions approach expiration. The contracts for the two utilities—among the largest distribution franchises in Brazil—are currently under review for renewal by the federal government.
The concession held by Enel Rio expires in December 2026, while Light’s concession is due to end in June 2026. ANEEL has already recommended extending both contracts for another 30 years, but the final decision rests with Brazil’s Ministry of Mines and Energy.
Together, the two companies serve nearly 7 million customer units across the state of Rio de Janeiro, making their tariff adjustments one of the most consequential regulatory decisions in Brazil’s power sector this year.
Tariff Paths Diverge
The contrasting outcomes illustrate how regulatory and financial factors can produce different tariff trajectories even within the same regional power market.
While Enel Rio’s tariffs rose more sharply due to the removal of previous financial offsets and ongoing pressure from sectoral charges, Light’s increase was partially tempered by the staged return of tax credits and by the regulator’s attempt to smooth tariff volatility in future cycles.
For consumers in Rio de Janeiro, however, both decisions reinforce a broader trend: electricity prices remain heavily influenced by sector-wide costs—subsidies, transmission infrastructure, and regulatory adjustments—rather than by the distribution companies themselves.
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