ISA CTEEP was born in 1999 from the division of assets of the São Paulo state company Companhia Energética de São Paulo (CESP), as part of the privatization program of the State Government. In 2001, the Company merged the Paulista Electricity Transmission Company (EPTE), resulting from the break up of Eletropaulo.

In 2002, ISA CTEEP became the first company in the electric sector in the state of São Paulo to adhere to Level 1 Corporate Governance of the São Paulo Stock Exchange (now B3), demonstrating its commitment to high standards of transparency in the disclosure of your information.

In a public auction promoted by the São Paulo government on the São Paulo Stock Exchange, in 2006, the company was privatized. The multilatine business group ISA gained control of the Company, acquiring 50.1% of the common shares (with voting rights). A year later, ISA's share would jump to 89.4% of common shares and 37.5% of ISA CTEEP's total capital.

Also in 2006, the company won, at an auction promoted by the National Electric Energy Agency (ANEEL) - the federal government agency responsible for regulating the sector - the concession to build a transmission line that crosses 14 municipalities in Minas Gerais, between the cities of Contagem and Ipatinga. This venture gave rise to the subsidiary Interligação Elétrica de Minas Gerais (IEMG).

At that time, with the proposal to restructure and consolidate its trajectory of sustained growth, the Company participated in another auction promoted by ANEEL and won the transmission concession lot that links the states of Tocantins, Maranhão and Piauí. The implementation and operation of the new project created the North and Northeast Electric Interconnection (IENNE).

The company increased its share in the sector again in 2008, with the acquisition of seven lots in new transmission auctions. Thus, it expanded its activities to six states, including its entry into the South Region, and consolidated its operations in the Southeast. The South Electrical Interconnection (IESUL) and the Pinheiros Electrical Interconnection (Pinheiros) were created. Among the outstanding projects that year, the Madeira Electric Interconnection (IE Madeira) started, which connects the energy generated by the plants on the Madeira River, in Rondônia, to the National Interconnected System (SIN).

A year later, in 2009, it would be the turn of participation in a new auction to give rise to the subsidiary Interligação Elétrica Serra do Japi, in São Paulo.

At the organizational level, in 2009, the Company advanced by establishing its Corporate Social Responsibility (CSR) policy, and in 2011, it launched its Code of Ethics, which reinforces transparency in the relationship with its stakeholders.

Meanwhile, in the operational field, the Interconnection Electric Garanhuns (IE Garanhuns) was created, created due to projects in the Northeast, and in 2012 the company Evrecy was acquired in Espírito Santo. ISA CTEEP thus completed its operations in 16 states.

At the end of the same year, the extension of the Company's main concession contract was signed with ANEEL, initiating another 30 years of concession in energy transmission services.

In 2013, the IE Madeira transmission line started to operate, the largest direct current transmission line in Brazil, with more than 2,300 kilometers of extension.

The company was the first organization in the electricity sector to achieve, in 2015, the international Quality Assessment certification, granted by the Institute of Internal Auditors (IIA) in recognition of the quality of the internal audit areas of organizations. In the same year, he received the Best Annual Report Award, granted by the Brazilian Association of Listed Companies (Abrasca).

In 2016, a decade was completed in which ISA acquired share control of ISA CTEEP, and the Company was recognized for the first time as one of the Best Companies to Work for in Brazil, according to the Great Place to Work (GPTW) ranking. It was also the winner of the Abrasca Award, which highlights the best Annual and Sustainability Reports. The organization resumed participation in transmission auctions, with the conquest of three lots in the states of Minas Gerais, Espírito Santo and Bahia - in the latter the company was not yet present. These projects originated the subsidiaries IE Paraguaçu, IE Aimorés and IE Itaúnas, expanding the Company's presence to 17 Brazilian states.

The following year, another five projects were auctioned off, with the creation of IE Ivaí, IE Tibagi, IE Itaquerê, IE Aguapeí, IE Itapura. ISA CTEEP was elected the best energy company in Brazil, in the "Best and Biggest 2017" awards, organized by Exame magazine, in addition to being present, for the second consecutive year, in the GPTW Best Companies to Work for ranking.

In 2018, the Company won two lots in transmission auction, which reinforce its presence in São Paulo and Santa Catarina. This year, the company was one of the winners of the “Transparency Trophy”, which highlights organizations that present their accounting information with excellence, and once again was included in the list of “Best Companies to Work for in Brazil”.

ISA CTEEP reached its 20 years existence in 2019 and continues to develop. The organization announced the first Brazilian project of Conexão Jaguar - the main sustainability program of the ISA group, which seeks to contribute to the mitigation of climate change, to the conservation of areas of importance for biodiversity and that connect jaguar populations in America Latin America, through the sale of internationally certified carbon credits.

The company obtained more important recognitions: it was the winner of the Valor 1000 Award, promoted by the Valor Econômico newspaper, in the Electricity sector. For the fourth year in a row, it was among the Best Companies to Work for at GPTW. Once again, she received the “Transparency Trophy” and was elected one of the Companies that Best Communicates with Journalists - the award was the result of a free and direct vote by journalists from all over Brazil.

Pursuing its growth strategy, ISA CTEEP won three lots at auction, with projects in Rio Grande do Sul, Mato Grosso do Sul, São Paulo and Minas Gerais. In the same year, IE Itapura went into commercial operation, 18 months ahead of ANEEL's implementation deadline.

The Company is currently working on the projects won in the most recent auctions, which will contribute to the expansion of Brazil's electricity transmission system.

Updated on January 24, 2020.