Hera Group ranks 2nd in the ESG Identity Corporate Index 2025 (ex IGI)
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The transaction, with a total value of €138 million, is expected to contribute more than €20 million to the growth of the Hera Group’s EBITDA

A group rooted across Northern Italy
The Hera Group has finalised the acquisition of 100% of STA Società Trattamento Acque S.p.A., based in Mantua, together with its subsidiaries: NTW (Cornuda – Treviso), CID (Colloredo di Monte Albano – Udine), NPC (Marene – Cuneo), Trentino Acque (Lavis – Trento), COMS (Talmassons – Udine) and Acque della Concordia (Mantua).
Taken together, these companies form the Sostelia Group, which, thanks to the distinctive expertise of its entities, ranks among Italy’s leading private players in the water treatment sector, offering advanced technologies, research and development capabilities, and high-level technical know-how. The sale was carried out for 65% by Xenon Fidec, an impact private equity fund managed by Xenon AIFM, and for the remaining 35% by entrepreneurs, minority shareholders of STA who, starting in August 2023, had transferred the entire share capital of the individual companies to the fund.
The Sostelia Group’s key figures
The Sostelia Group manages more than 1,200 treatment plants, serves over 1,200 active clients, employs around 350 people and has a turnover of approximately €100 million. Its financial and economic profile confirms the industrial strength of the transaction. Around 70% of its activities are focused on industrial clients.
Economic rationale: enterprise value of €138 million and more than €20 million contribution to EBITDA
The transaction has an enterprise value of €138 million and is expected to generate a contribution of more than €20 million to the growth of the Hera Group’s consolidated EBITDA, in addition to the value of the expected integration synergies.
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Hera Group ranks 2nd in the ESG Identity Corporate Index 2025 (ex IGI)
On the tenth anniversary of the ESG Identity Corporate Index, Hera also received recognition for performance and continuity as Strongest Performer, Best Finance Identity and Best Transition Identity among Large Cap companies.

At the ESG Business Conference 2025, the Hera Group ranked second among Italian companies for its integration of sustainability policies into its business strategies and corporate governance. This year as well, and for the fifth consecutive time, Hera is among the leaders of the ESG Identity Corporate Index (formerly the Integrated Governance Index) managed by ETicaNews.
Hera thus celebrates ten years in the Top 10 of the Index, launched in 2016. And precisely one decade after the ESG Identity Corporate Index project was created, the Group was also awarded three multi-year performance and continuity awards, aimed at companies that participated in all of the last six editions (2020-2025) of ESG.ICI. More specifically, in the Large Cap category, Hera won the awards: Strongest Performer, Best Finance Identity and Best Transition Identity.
Sustainable growth and communication with local areas at the centre of strategies
The integration of ESG targets into business strategies and strong local roots are distinctive features of the Hera Group. Today, more than 7.5 million citizens have at least one service provided by the Group in the waste management, energy and water sectors, contributing to the Group doubling its operational size over the last decade. Its business model bases growth and value creation on sustainability, promoting innovation and an inclusive dialogue with all stakeholders. This ongoing dialogue enables Hera to face the challenges raised by the ecological transition, energy security and climate change.
The ESG Identity Corporate Index
The ESG.ICI is Italy’s only quantitative index that measures the integration of ESG principles into corporate strategies, assessing companies’ commitment to sustainability, social responsibility, the environment and governance. It is unique for its scientific and quantitative approach and aims at measuring the degree of integration of ESG factors in corporate processes, outlining trends, identifying best cases and stimulating debate.
The 2025 survey involved 98 companies, 72 of which were listed.
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