Brazil’s Ministry of Mines and Energy (MME) and the Energy Research Office (EPE) have published the Electricity Transmission Brochure of the Decennial Energy Expansion Plan 2035 (PDE 2035).
The study presents projected investments for the expansion of the transmission system through to 2035, reflecting the need to address a sector undergoing rapid transformation, driven by the growth of renewable energy sources and the connection of large electricity loads.
In this context, the study evaluated three expansion scenarios: a reference scenario, adopted as the basis of the Decennial Energy Expansion Plan 2035 (PDE 2035), and two alternative scenarios—one optimistic and one pessimistic—with a lower probability of occurrence. Under the reference scenario, investments of approximately R$120 billion in the transmission system are projected by 2035.
In addition to the results related to transmission system expansion, including the presentation of the physical evolution of the grid and investment projections, the PDE 2035 document also addresses other relevant issues related to transmission expansion planning, such as:
(i) Data from key transmission studies: In this context, particular attention is given to the study on the expansion of regional interconnections, which resulted in the recommendation to implement a bipolar high-voltage direct current (HVDC) link using Voltage Source Converter (VSC) technology—an unprecedented solution in Brazil.
The new bipolar link will significantly expand interregional exchange capacity, enhance the operational security of the National Interconnected System (SIN), enable the flow of large volumes of renewable generation and position the country at the technological forefront of power transmission. Also noteworthy are studies focused on supplying large loads, such as data centres and hydrogen production projects based on electrolysis.
(ii) Information on the evolution of exchange capacities between the SIN’s geo-electrical regions;
(iii) Projections of potential investments related to assets reaching the end of their regulated useful life;
(iv) A mapping of the number of transmission asset concession contracts set to expire in the coming years; and
(v) General considerations on the evolution of Transmission System Use Tariffs (TUST).
