The result of the Auction for Supply to Isolated Systems 2025 held last Friday (26), marked an important step towards the insertion of clean sources in regions disconnected from the SIN (National Interconnected System).
The tender contracted six hybrid generation units, totaling 50,265 MW of power and planned investments of R$312,8 million, intended for supply to locations in Amazonas and Pará.
The contracts are valid for 15 years and supply begins in December 2027. The winning solutions combine solar plants with diesel-fired thermoelectric plants and battery storage systems.
The auction was also the first in the country to require a minimum 22% share of renewables in each project, in addition to pricing the emissions avoided by the associated clean generation.
In total, SISOL 2025 had 241 registered projects, of which 39% were thermoelectric plants and 61% hybrid plants (thermoelectric + photovoltaic with or without storage), according to a report from EPE.
Analysis of the contest
In evaluating the ABSOLAR (Brazilian Association of Photovoltaic Solar Energy), the result of the auction represents a first step towards expanding the use of batteries combined with solar generation, especially in areas without an electrical grid.
“Although contracting photovoltaic technology with storage systems in the two lots of the auction is a good first step, it is necessary to increase the minimum fraction of renewables in future auctions of this kind,” comments Rodrigo Sauaia, executive president of ABSOLAR.
Isolated system auction contracts hybrid projects with diesel, solar and BESS
According to the director, several applications involving storage and photovoltaic systems are already being used in international markets, given that these are consolidated technologies with projects in operation in several countries.
"To accelerate the decarbonization process in various Brazilian regions, it is necessary to increase this 22% share of renewable energy contracts to over 50% as quickly as possible, to benefit the energy transition and ecological transformation," he adds.
Additionally, Sauaia recalls another opportunity that the sector has at its disposal is the implementation of the LRCAP (Storage Capacity Reserve Auction), initially scheduled to be held in the first half of 2025. Interested investors are awaiting the publication of the auction guidelines to prepare for this important event.
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