Hera Group finalises the acquisition of the Sostelia Group and becomes Italy’s leading player in water treatment
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The recognition rewards the credibility and consistency with which the Group integrates ESG factors into its strategy, governance and corporate culture

We ranked first in the 2026 ESG Identity Corporate Index, developed by ET.Group to measure the extent to which ESG factors are integrated into companies’ strategies and decision-making processes. The results of the eleventh edition were presented today in Milan at the ESG Business Conference.
Our growth, together with the progressive evolution and increasing maturity of our ESG model, has gone hand in hand with continuous advances in governance, enabling us to rank among the Top 10 for 9 consecutive years and on the podium for six years in a row.
A more selective assessment focused on ESG credibility
The recognition is even more significant as it is the outcome of a rigorous assessment process carried out against a benchmark that continues to rise. The 2026 edition included a record 109 companies, all demonstrating increasingly advanced levels of ESG maturity. The assessment itself has also become more demanding, shifting the focus from disclosure alone to companies’ ability to demonstrate the effective integration of ESG factors into strategy, decision-making processes and corporate culture. The analysis centres on the development of a robust and coherent ESG strategy geared towards value creation, transparent reporting of results, and the ability to anticipate and manage risks.
For us, particular emphasis was placed on:
- governance as an enabler, supported by the active involvement of dedicated governance bodies;
- the integration of ESG targets into remuneration policies and long-term strategies;
- the ability to foster a cross-functional ESG culture involving all business functions and the entire value chain.
Over more than twenty years, we have combined sustained economic growth with the evolution of our governance towards increasingly demanding targets, clear accountability and measurable performance. The credibility of our commitment rests on a consistent track record of delivery, as demonstrated by significant investments, completed projects and reported impacts. The same rigour underpins investment in people development through skills, inclusion and professional growth, as well as incentive systems that embed sustainability targets.
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Hera Group finalises the acquisition of the Sostelia Group and becomes Italy’s leading player in water treatment
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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