ACEA Tor di Valle
District heating plant, Tor di Valle
To replace its Tor di Valle plant, built 30 years ago, ACEA has appointed a consortium including General Electric and Cefla to carry out the required renovation works, so as to ensure quality and continuity for 40,000 residents and significantly improve efficiency, addressing issues related to prices in today's wholesale energy market.
Strengths
Turnkey solution
Cefla managed the entire project, from design to installation, including seismic retrofitting and restoration of existing structures.
Advanced technology
Installation of two GE Jenbacher J920 FleXtra motor generators, each with a capacity of 9.5 MW, for a total output of 19 MW of electricity and approximately 15 MW of heat, with an overall efficiency of over 80%.
Operational flexibility
The engines can be started or stopped in less than 5 minutes, allowing Acea to flexibly meet the needs of the network in real time.
Environmental sustainability
Reduction of CO₂ emissions by 16,000 tonnes per year, improving air quality for the local community.
Key Numbers
50 km
total length of the network
19 MW
Electricity
15 MW
Thermal energy
production
>80%
Overall efficiency
Background
Today, the efficiency of the plant ensures that only the exact amount of fuel needed to meet the local population's heating, hot water and wastewater treatment requirements is used.
Challenges
- Refurbishment of an existing plant
Adapting a decades-old power plant to modern energy and environmental requirements. - Integration of new technologies
- Installing latest-generation cogeneration engines and auxiliary boilers without interrupting the district heating service.
- Flexible production management
Ensuring a rapid response to changes in energy demand.
Project Tasks
Installation of two GE Jenbacher J920 FleXtra motor generators, each with a capacity of 9.5 MW.
Addition of three auxiliary gas boilers for a total thermal power of 70 MW, useful for covering peak demand.
Revamping and seismic proofing of the existing building.
Implementation of an advanced control system for optimal plant management.
Multi-year maintenance contract to guarantee engine performance.
Implementation
Acea has worked in conjunction with two key partners to achieve energy self-sufficiency at its wastewater treatment plant.
The partnership with General Electric and Cefla has enabled the J920 FleXtra gas engine to be commissioned four months ahead of schedule.
The use of 3D simulations accelerated the design and installation process.
The J920 FleXtra engines are the first commercial units in operation in Italy.
General Electric supplied the necessary equipment, while Cefla managed the engineering and installation tasks, ensuring seismic compliance and CE certification.
The Tor di Valle plant, operational since 2017, offers 80% efficiency, reducing CO2 emissions by 16,000 tonnes per year and improving air quality.
Cogeneration enables efficient fuel use and energy self-sufficiency for the treatment plant, which serves over 2 million residents.
Six 1,320 m3 tanks manage peak demand, and the engines can be started or stopped in less than 5 minutes, allowing Acea to respond quickly to network requirements. The plant contributes significantly to reducing local emissions, improving the quality of life in Tor di Valle.
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