Altenia Energy infrastructure and solar power plant construction & maintenance in Italy
Innovation and experience. Altenia at the service of your energy assets.
Altenia is a single partner for the development and long-term care of energy assets, supporting its clients across the full lifecycle: from design and construction to maintenance and refurbishment, Altenia responds promptly to market needs, helping to secure operational continuity and maximum asset performance. This is the result of combining the specialist expertise and experience of the companies within the Terna Energy Solutions Group.
Data Center
We build HV electrical substations end-to-end, managing the entire project through a single customer interface and ensuring quality, safety, on-time delivery and full integration with the Group’s strategic equipment.
IPP and Investment funds
Thanks to an integrated approach and turnkey management, we offer a single point of reference for the design, EPC and O&M of energy assets in Italy.
Utility
We ensure the business continuity of high-voltage energy infrastructures, delivering reliability, rapid response and operational excellence thanks to well-established know-how.
Industries
We support our clients with tailor-made solutions, designed to effectively meet specific project needs.
Our solutions
Comprehensive support for the end-to-end management of electrical infrastructure and renewable energy plants.
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Engineering, Procurement & Construction
Discover the solutionAs an EPC contractor in Italy, we design and deliver turnkey HV electrical systems and solar PV plants: over 150 HV installations and 2 GW of installed renewable capacity already delivered by Altenia.
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Operation & Maintenance
Discover the solutionPlanned maintenance and continuous monitoring to maximise reliability and operational continuity: over 600 HV O&M interventions in 2025 and 1.5 GW of solar PV capacity under management.
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Revamping & Repowering
Discover the solutionWe upgrade and repower existing HV, MV and LV electrical infrastructure, improving efficiency, availability and energy performance, while extending asset lifespan and boosting performance.
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Energy advisory services
Discover the solutionThe Group’s ESCo has delivered over 250 energy audits, helping to cut CO₂ emissions by 4 million tonnes and achieve the highest standards of energy efficiency.
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Services and digital solutions
Discover the solutionCustomised engineering services and advanced digital technologies for the digitalization of HV/MV and solar PV energy assets, making them more efficient, easier to monitor and smarter.
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Power continuity
Discover the solutionThrough Half Bridge Automation (HBA), a company owned by Altenia, we refurbish, repair and rent out solar PV inverters: over 100 MW of inverters refurbished in 2025.
Our projects
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Two 113 MW agrivoltaic plants completed in Sicily
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Construction of a Solar Park of 37 MW near Viterbo (Italy)
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Construction of an electrical substation near Viterbo (Italy)
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Our results
> 150
systems and projects realized
> 600
O&M interventions per year
> 1 GWp
capacity installed in EPC mode
> 1.5 GWp
managed power
4
energy storage systems installed
> 1 GW
capacity installed
> 150
projects worldwide
> 100 MW
inverter regenerated in 2025
> 7,000
on-site working hours in 2025
> 250
energy audits
> 4
million tons CO2 reductions
Altenia News
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Altenia completes the acquisition of Energy System Services
The acquisition of 100% of ESS from BayWa r.e. Italia has been completed.
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Ciminna agrivoltaic project reaches new milestones
Major electrical infrastructure milestones completed for the 67.42 MWp plant in the Province of…
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Altenia strengthens its photovoltaic O&M business
The new agreement signed with Comunità Energetiche S.p.A. covers 46 photovoltaic plants totaling approximately…
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Altenia opens a new office in Taranto
Strengthening its presence across Italy and its commitment to local communities
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Altenia invests in skills for operational excellence
Specialized training at the Terna Academy for the Operation & Maintenance team
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Altenia obtains ISO 50001 certification
Another milestone in the company’s journey towards energy efficiency and sustainability
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Completed the STE Energy merger into Altenia
As of July 1, STE Energy is officially part of Altenia
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Grid connection completed for a 28.08 MWp photovoltaic plant
Thanks to the implementation of a Fast Installation Connection Station (SCRI), the plant’s commissioning…
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Advanced Solar Tracker monitoring solutions
Innovation and data analytics to maximize the value of photovoltaic plants