From permitting to connection at high voltage.
We design utility-scale energy infrastructure — generation, storage and data centres — and the grid works that connect it. As an integrated assignment or on the grid works alone.
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Three lines of work
All servicesTurnkey permitting
We take the plant through the entire authorisation process, through to the permit being granted: strategy, multi-scale constraint analysis, filing, and handling of requests for further information from the authorities.
DesignGrid works
RTN substations, primary substations, HV overhead lines and shared user substations, with review of the STMG (the grid operator's binding connection proposal) and of the PTO packages submitted to Terna and the distribution operators.
ExecutionDetailed design and site supervision
IFC construction drawings, site supervision and quality control, variation management, as-built updates and the final plant dossier.
The electrical infrastructure we design
Our projectsRTN substations
Final design and connection works on the national transmission grid (RTN), including coordination of the PTO (Piano Tecnico delle Opere), the technical plan for the connection works.
HV/MV primary substations
Primary substations and technical plans for connection works on the distribution grid.
HV overhead lines
Overhead and underground lines: route studies, interference analysis, towers and typical sections.
User and shared substations
SEU (Sistemi Efficienti di Utenza) and shared MV/HV substations for multiple producers or energy-intensive users, cable ducts and user works.
- 20 kVMedium voltage
- 36 kVHigh voltage
- 132 kVHigh voltage
- 150 kVHigh voltage
- 220 kVHigh voltage
- 380 kVExtra high voltage
| Project | Level | Location | Year | Power |
|---|---|---|---|---|
| Shared user substation 30/380 kV | EHV · 380 kV | Chiaramonte Gulfi (RG) | 2025–26 | 990 MW |
| Shared user substation 30/150 kV | HV · 150 kV | Palazzo San Gervasio (PZ) | 2025 | 250 MW |
| BESS plant and Terna connection | HV · 220 kV | Siculiana (AG) | 2026 | 215 MW |
| BESS plant and Terna connection | EHV · 380 kV | Carlino (UD) | 2025 | 141 MW |
| BESS plant and Terna connection | HV · 132 kV | Malo (VI) | 2026 | 120 MW |
| Primary substation 150/20 kV and 150 kV overhead line — 7 km | HV · 150 kV | Banzi (PZ) | 2025 | 50 MW |
| RTN substation 150/36 kV | HV · 150/36 kV | Marsala (TP) | 2026 | — |
| RTN substation 150/36 kV | HV · 150/36 kV | Mazara del Vallo (TP) | 2026 | — |
About us
CaltaTech is an engineering company working in energy infrastructure: renewable generation, storage systems, energy-intensive users and the electrical grids that connect them.
Every project is staffed in-house across all the disciplines involved: no handover between the people who set the permitting strategy and the people who sign the drawings.
Do you have a project in development or a connection to verify?
Tell us where the permitting process stands and which voltage level you are connecting to.
Let's talk about your project