The advance of distributed solar energy demands a new tariff model to ensure sustainability and fairness in Brazil’s electricity sector.
The significant growth of distributed solar generation in Brazil, while a step forward for clean energy, has sparked debates about the sustainability of the current tariff model. The Electric Energy Compensation System (SCEE), known as ‘net metering,’ has been the main driver of this expansion, but its current structure raises significant concerns about the sector’s financial and operational balance.
The most critical point lies in the implicit subsidy that the system offers to distributed micro and mini-generation. Estimates indicate that, in 2025, this benefit could reach R$ 17.1 billion. This amount is, in practice, passed on to consumers who do not have their own generation systems, raising questions about tariff justice and equity among different profiles of Brazilian consumers.
Operational and Financial Challenges of Distributed Generation
The rapid pace of distributed solar generation adoption, with an annual growth rate of 122.8%, resulted in an installed capacity of 47.6 gigawatts by the end of 2025. This significant expansion, while positive for the renewable energy matrix, imposes considerable technical challenges on distribution networks. A direct consequence is the need for forced curtailment of generation at certain times to prevent overloads. Furthermore, the massive injection of surplus energy and the mismatch between peak solar production hours (during the day) and highest consumption hours (usually at night) have caused critical deviations in network voltage levels, compromising supply quality.
Proposals for a Fairer and More Efficient Tariff System
Experts from the Acende Brasil Institute have advocated for the implementation of a tariff reform to promote greater economic rationality in the electricity sector. The central proposal is the adoption of tariffs that more accurately reflect the real costs and benefits associated with distributed generation. This includes the suggestion of differentiated tariffs that consider consumption and generation times, the demand placed on the grid, and the consumer’s geographical location. The goal is to build a more equitable system where costs are distributed fairly among all users, ensuring the financial and operational sustainability of the national electricity system.
The discussion surrounding the tariff for distributed solar energy is crucial for the future of Brazil’s electricity sector. The quest for a balance that encourages the expansion of renewable sources, like solar, without disproportionately burdening other consumers and compromising the stability and efficiency of distribution networks, is the main challenge. The implementation of more flexible tariff mechanisms aligned with real costs is seen as a fundamental step to ensure a sustainable and fair advance of clean energy in the country, paving the way for solutions that benefit all involved in the energy value chain.
