Northeast–South Interconnected System

Northeast–South Interconnected System
Name	Northeast–South Interconnected System
Country	Brazil
Status	Active
Type	Interconnected grid
Established	20th century
Owner	Centrais Elétricas Brasileiras S.A. (ELETROBRAS), Operador Nacional do Sistema Elétrico (ONS)
Capacity	Gigawatt-scale

Northeast–South Interconnected System The Northeast–South Interconnected System is a major electric transmission network linking the Northeast Region and the South Region across Brazil. It integrates generation from Itaipu Dam, Belo Monte Dam, Xingó Hydroelectric Complex, and renewable projects such as Complexo Eólico do Nordeste and Parque Eólico de Osório, while interfacing with institutions like Eletrobras, ONS, ANEEL, IBAMA and international actors including Itaipu Binacional, Mercosur, Inter-American Development Bank and World Bank.

Overview

The system connects transmission corridors spanning from Recife and Fortaleza through Salvador and Brasília to Porto Alegre and Curitiba, integrating assets such as Itaipu Dam, Santo Antônio Dam, Jirau Dam, Operador Nacional do Sistema Elétrico (ONS), Eletrobras, Companhia Hidrelétrica do São Francisco (CHESF), Companhia Energética de Minas Gerais (CEMIG), Petrobras, Vale (company), CPFL Energia and Energisa. Key substations and transmission projects involve Linha de Transmissão 500 kV, LINHA 765 kV, Usina Hidrelétrica de Tucuruí, Usina Hidrelétrica de Balbina and international studies with USAID, European Investment Bank and Asian Development Bank.

History and Development

Development traces to early 20th-century electrification efforts by entities like Companhia Paulista de Força e Luz and later national expansion under Getúlio Vargas-era initiatives and the creation of Eletrobras and CHESF. Mid-century projects included Itaipu Dam negotiations with Paraguay, later complemented by Amazonian developments such as Balbina Dam and Tucuruí Dam. Structural reforms in the 1990s involved legislation like reforms influenced by Washington Consensus policies, regulators such as ANEEL and privatizations affecting Cemig and Light S.A., while international finance from World Bank and Inter-American Development Bank funded transmission reinforcements linking Nordeste and Sul. Later integration accommodated renewable expansion with projects associated with REN21, COP21 commitments, Proinfa program initiatives, and auctions administered by ANEEL involving firms like Iberdrola, EDP Renováveis, Engie and Siemens.

Network Architecture and Components

Topology combines high-voltage alternating current corridors and select high-voltage direct current links similar to projects in China and United States grids. Key components include 500 kV and 765 kV transmission lines, substations at Salvador, Fortaleza, Recife, Belo Horizonte, Curitiba, Porto Alegre, and converter stations akin to those used by Alstom and Siemens Energy. Generation nodes include hydroelectric complexes such as Itaipu Dam, Belo Monte Dam, Santo Antônio Dam, Jirau Dam, thermal plants historically run by Petrobras, biomass facilities near Manaus, as well as wind farms in Bahia and solar parks in Minas Gerais and Piauí developed by Enel Green Power, Renova Energia, EDP Renováveis and consortiums involving Vale (company). Control centers operated by ONS coordinate dispatch, while market operations interact with stakeholders like B3 (stock exchange), BNDES, CNI (Confederação Nacional da Indústria), and regional operators.

Operations and Management

Real-time operations are managed by Operador Nacional do Sistema Elétrico (ONS), with regulatory oversight from ANEEL and environmental licensing by IBAMA. Market frameworks use auctions and contracts influenced by policies from Ministério de Minas e Energia (MME), interaction with state utilities such as CEMIG, Copel, CEEE and private firms like CPFL Energia, Energisa, Neoenergia. Grid code enforcement references technical standards adapted from international practices by IEEE, CIGRE, and consultants from Siemens, ABB, GE Renewable Energy and Schneider Electric. Operations incorporate forecasting from institutions like INMET, CPTEC/INPE and planning tools developed with support from World Bank programs and research by universities such as Universidade de São Paulo, Universidade Federal de Pernambuco and Universidade Federal do Rio Grande do Sul.

Generation, Transmission, and Interconnection

Generation mix spans hydroelectric, thermal, wind, solar and biomass assets, coordinated via transmission corridors linking Itaipu Binacional and Amazonian plants to southern load centers like Porto Alegre and industrial hubs in São Paulo. Interconnection projects mirror international examples including links studied with Argentina and influenced by regional integration initiatives within Mercosur and technical exchanges with ENTSO-E and grid operators from United States and China State Grid. Transmission investment has involved contractors such as Camargo Corrêa, Andrade Gutierrez, Queiroz Galvão and equipment suppliers like Siemens, ABB and GE. Financing mechanisms employed loans from BNDES, Inter-American Development Bank and equity from utilities including Eletrobras and Cemig Energia Comercialização.

Reliability, Security, and Grid Integration

Reliability metrics and contingency planning draw on models from CIGRE and standards from IEEE, with security coordination among agencies including ANEEL, ONS and law enforcement when required. Cybersecurity practices reference frameworks from NIST and cooperative programs with CERT.br and private vendors Cisco Systems and FireEye. Integration of intermittent renewables uses approaches similar to those advanced in Germany, Spain and Denmark involving storage pilot projects, demand response pilots with Siemens and GE, and research partnerships with Instituto Nacional de Altos Estudos (INAE) and laboratories such as LNLS and CEPEL. Emergency response and resilience planning employ lessons from events like the 2009 Brazil blackout and collaborate with agencies including Ministério da Defesa and disaster management institutions such as Defesa Civil.

Category:Electric power transmission in Brazil