Brazil's Power Grid

Overview

  

Brazil’s energy sector is governed by the Federal Constitution.  Since the late 1980s, the energy sector has experienced several restructurings, aiming to facilitate private investment and create sector security. Today, the power trading market is divided into the regulated market (ACR) and the free market (ACL).  In the ACR, distributors purchase energy through auctions overseen by the ANEEL and supply consumers at regulated tariffs. In the ACL, eligible consumers freely negotiate contracts with generators or traders.

  

Electricity mix

  

Brazil's electricity mix is cleaner than most countries, as shown in Figure 1.

  

Basic Grid

  

Brazil’s electric energy (EE) production and transmission is a large and widespread system, dominated by hydropower plants of multiple owners.  Such interconnected system (“SIN-Sistema Interligado Nacional") (a.k.a. “Basic Grid”), provides the transfer of energy btw subsystems, allows synergistic gains, and exploits the diversity of hydrological regimes of basins, serving the market in a safe, efficient, and economical way.

  

It operates primarily at voltages equal to or above 230 kV, delivering an average of ~78,500 MW in 2024. This high-voltage infrastructure supports long-distance, high-capacity transmission, integrating generation from multiple sources, including large hydropower plants, thermal units, and increasingly variable renewable sources.  Figure 2 shows Brazil's Basic Grid.