With this integration, the multiutility further strengthens its positioning also in the industrial and civil water treatment sector
Hera Group further strengthens its leadership in the environmental sector, in particular in the treatment of civil and industrial water, thanks to the binding agreement signed for the purchase of 100% of STA and the related stakes in the subsidiaries that are part of the Sostelia Group (NTW, CID, NPC, Trentino Acque, COMS, Acque della Concordia, Arcobaleno GC). Sostelia is an important Italian private player for technologies and the treatment of industrial and civil water, 65% controlled by Xenon Fidec, an impact private equity fund managed by Xenon AIFM, and with the remaining 35% held by entrepreneurs representing the companies within the group.
The transaction has an enterprise value of €138 million. The acquisition by Hera Group is subject to certain customary closing conditions (including notifications and approvals by the competent authorities) and is expected to be completed by the end of March 2026.
Once fully integrated, the transaction is estimated to contribute more than €20 million to the consolidated EBITDA growth of Hera Group, in addition to the value of the expected integration synergies.
The strategic lines of the transaction
The transaction creates a benchmark player in Italy with an integrated offering in the water treatment market - from design and construction (EPC) to operation and maintenance (O&M), up to the treatment and disposal of liquid waste and sludge related to purification processes. It also enables a strong system of synergies with Herambiente, the Hera-controlled subsidiary and Italy’s foremost environmental operator, enhancing quality, efficiency, and service continuity for both public and private customers.
Synergies are, in fact, one of the main drivers of value creation. On the one hand, the integration of Sostelia’s services could enable Herambiente to broaden its commercial offering by providing its customers with additional services such as revamping solutions and the design of new plants, or the operation and maintenance of existing private plants, ensuring technical-operational continuity that translates into greater reliability and lower operating costs. On the other hand, Sostelia’s customer portfolio represents a significant opportunity for Herambiente to integrate its own service offering.
More generally, the combination of Sostelia’s technical expertise, plant infrastructure, and commercial capability will enable Hera Group to expand its customer base, diversify revenues, and increase business resilience in a sector that requires speed of intervention, high quality of service, and continuous innovation.
For further information
Press release