Hera Group finalises the acquisition of the Sostelia Group and becomes Italy’s leading player in water treatment
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Hera Group finalises the acquisition of the Sostelia Group and becomes Italy’s leading player in water treatment
The integration further strengthens the multi-utility’s position in both municipal and industrial water treatment, while activating strong commercial synergies with its subsidiary Herambiente. 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
Today 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.
Signing completed following the successful verification of the conditions precedent
Today’s closing follows the successful verification of all conditions precedent set out in the binding agreement signed on 19 January and announced on the same date. These included, among other things, the prior divestment of 100% of Smart SEA, a company excluded from the scope of the transaction.
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. Around 70% of its activities are focused on industrial clients.
A leading player in water treatment is born
Through this acquisition, the Hera Group further strengthens its positioning both the Water and Waste sectors, in the treatment of municipal and industrial water – an area that is highly synergistic with its activities.
As outlined in greater detail in the press release issued when the binding agreement was signed, with this acquisition the Hera Group becomes the reference player in Italy in water treatment, with an integrated offer across the entire supply chain.: from design and construction to operation and maintenance, through to the treatment and disposal of liquid waste and sludge associated with purification processes.
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.
Advisors involved in the transaction
In the transaction, Hera was advised by PwC as strategic advisor and by GA-Alliance for legal matters, while Xenon was advised by Rothschild & Co. as financial advisor, by LCA for legal matters, and by Deloitte Financial Advisory and Fortlane Partners.
The Hera Group is one of Italy’s largest multi-utilities and operates in the environmental, energy and water sectors, with more than 10,500 employees. Over 7.5 million citizens receive at least one service provided by the Group. Listed since 2003, Hera ranks among the top 40 Italian companies by market capitalisation (it is part of the FTSE MIB index) and since 2020 has been included in the Dow Jones Sustainability Index (recently renamed the Dow Jones Best-in-Class Index). https://eng.gruppohera.it
Xenon FIDEC is one of the first Italian sustainable private equity funds, in compliance with Article 9 of the SFDR Regulation. It supports entrepreneurs and companies in building Italian leaders active in the energy and ecological transition, and is managed by Xenon AIFM S.A., an alternative investment fund manager authorised by the Commission de Surveillance du Secteur Financier (CSSF) in Luxembourg. For thirty years, Xenon has worked alongside family-owned businesses to manage transformation projects aimed at driving growth, mainly through buy-and-build strategies.
The Sostelia Group was created through an aggregation strategy promoted by the Xenon FIDEC fund, launched in 2023, bringing together companies that provide design, construction and maintenance solutions for water treatment plants. The minority stake is held by the entrepreneurs representing the various companies acquired during the build-up process. Today, the Group represents an important Italian private player in the sector, capable of offering biological and physico-chemical treatment plants, zero-discharge systems, and technologies for the treatment of primary and process water as well as liquid waste.
Download the press release
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The multi-utility tops the ranking, marking its sixth consecutive year on the podium, the only Italian company to achieve this result. The recognition rewards the credibility and consistency with which the Group integrates ESG factors into its strategy, governance and corporate culture.
Hera Group 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.
The Group’s growth, together with the progressive evolution and increasing maturity of its ESG model, has gone hand in hand with continuous advances in governance, enabling the multi-utility 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 credibilityThe 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 Hera Group, 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.
Hera Group builds its ESG narrative on its strategy, its commitments and its ability to translate them into tangible results. Over more than twenty years, the multi-utility has combined sustained economic growth with the evolution of its governance towards increasingly demanding targets, clear accountability and measurable performance. The credibility of the Group’s commitments 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.
For Hera Group, ESG is therefore the practical framework through which the company governs, grows and creates value over time.