Hera Group finalises the acquisition of the Sostelia Group and becomes Italy’s leading player in water treatment
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It will finance strategic projects of the multi-utility aligned with the EU Taxonomy. Orders received amouned to 7 times the offered amount

The Hera Group launches its first European Green Bond (“EuGB”), under its “Euro Medium Term Note Programme” (EMTN).
This bond issuance – in line with its European Green Bond Factsheet, published in the dedicated section of the Group’s website (https://eng.gruppohera.it/group_eng/investor-relations/debt-and-rating/green-financing-framework-e-opinion), together with the relevant Pre-Issuance Review, attracted significant interest from international investors, receiving orders for approximately 3.6 billion euros, nearly 7 times the offered amount.
With this issuance, which corresponds to the fifth green issuance overall considering all those carried out by the multi-utility over the last 12 years, the Hera Group has once again offered the market the opportunity to finance strategic projects aimed at the green transition and aligned with the EU Taxonomy, reaffirming its position as a benchmark company for sustainable finance, also at an international level.
Characteristics of the Group’s European Green Bond (“EuGB”) and funded areas
The Hera Group’s first European Green Bond (“EuGB”) amounts to a total of 500 million euros, repayable in 6 years with a coupon of 3.50% and a yield of 3.574%. The settlement date of the new issuance is expected on 4 June 2026.
The EuGB is represented by senior, non-convertible, unsecured notes, intended for circulation among qualified investors and governed by English law. Furthermore, the European Green Bond (EuGB) is expected to be assigned a rating in line with that of Hera.
The transaction saw significant participation from international investors (in particular, United Kingdom, France, Germany). Substantially all of investors were green and sustainable, confirming the interest in the Group also beyond national borders.
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Press release
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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.
For further information
Press release