The story
On 31 May 1999, Terna was established within the Enel Group, by way of implementation of Italian Legislative Decree No. 79/99 which within the context of the process for the deregulation of the Italian electricity sector, sanctioned the separation between ownership and management of the national transmission grid.
On 23 June 2004, following the Prime Minister's Decree issued on 11 May of the same year, Terna was put on sale with an IPO on Borsa Italiana.
In November 2005, Terna acquired a business unit from GRTN, as defined by the Prime Ministerial Decree of 11 May 2004. Cassa Depositi e Prestiti became the relative majority shareholder.
In 2010 Terna joined Desertec, a project aimed at producing and transmitting renewable energy in the Middle East and North Africa (MENA) to meet local needs and be assigned in part to the European interconnected grid.
In 2011, the Terna Group reorganized its corporate structure, establishing a holding company overseeing two fully owned operational subsidiaries: Terna Rete Italia and Terna Plus, each with its own CEO and board of directors.
In 2013, Terna initiated strategic projects, including the “Capri-Torre Annunziata” submarine cable connecting Capri to mainland Italy. The same year, Terna and its French counterpart RTE began work on enhancing the Italy-France interconnection via the new “Piedmont-Savoy” line, which became operational in 2023.
In 2015, Terna acquired the high-voltage grid of the FS Italiane Group and started developing new national and international interconnection infrastructures, including SA.CO.I.3 (Italy-Corsica-Sardinia) and links with Montenegro (inaugurated in 2019) and Austria (operational in 2023).
To support efficiency improvements and environmental protection investments in its national infrastructure, Terna issued its first Green bond worth €750 million in July 2018, becoming the first Italian utility to do so. Additional green hybrid bonds followed in 2022 (€1 billion) and 2024 (€850 million).
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In 2022, Terna launched the Tyrrhenian Link interconnection project between Campania and Sicily, followed in 2023 by the Adriatic Link project between Marche and Abruzzo. That year, Terna also activated the submarine connection between Elba Island and Piombino. Internationally, the company developed the world's longest direct-current cable laid along a highway between Italy and France and initiated the first submarine direct-current connection between Europe and North Africa, linking Italy and Tunisia.
In April 2023, Giuseppina Di Foggia was appointed CEO and General Manager, becoming the first woman to lead a major publicly listed Italian company. The same year, Terna launched its 2023-2032 Development Plan, featuring over 30 infrastructure projects, including the Hypergrid project, utilizing high-voltage direct current (HVDC) technologies to double exchange capacity and achieve Italy’s energy transition and security objectives. The Plan was updated in 2025.
On 6 November 2024, Terna signed a binding agreement with Areti, a company controlled by Acea, for the acquisition of part of the high-voltage power grid in the metropolitan area of Rome, marking a step in the process of streamlining and unifying the management of the national transmission grid.
In March 2025, Terna Energy Solutions, the Group company managing non-regulated activities, was reorganized by integrating expertise previously managed by other subsidiaries. Specifically, Altenia was established, bringing together all system integrator activities that had previously been managed separately by LT, Terna Energy Solutions, and Avvenia.
Also in 2025, the Terna Foundation, established in July 2024, was officially presented to the public to promote greater inclusion and broad access to the world of energy through projects and initiatives focused on three main areas of intervention: the dissemination of an energy culture, promoting literacy also through educational initiatives involving younger generations; combating energy poverty; and programs that foster access to the labor market and new professional opportunities in the energy sector.
From Wikipedia’s article on Terna Group, shared under CC BY-SA 4.0.5