Italian solar design is governed by two connection standards, one national energy services agency, one grid operator process, and a tax incentive regime that has changed repeatedly. The technical work is conventional. The compliance work is not, and it is what decides whether a project connects on time. Software choice in Italy should be made against the documentation the process consumes.
Direct answer. The best solar design software in Italy for most installers is an Italian-market tool for domestic work and SurgePV or PVsyst for commercial, because the binding requirements are CEI 0-21 for low-voltage connection and CEI 0-16 for medium-voltage. No international platform emits Italian compliance documentation, so editable CAD output and a clean set of inputs for the TICA connection request are what matter.
TL;DR
- CEI 0-21 governs low-voltage connection and CEI 0-16 governs medium-voltage. The threshold decides the whole compliance path.
- The connection request, the TICA, runs through the distribution operator and sets the project timeline.
- The GSE administers the incentive and withdrawal mechanisms, and its requirements shape the documentation.
- CEI 82-25 is the design guide Italian technicians work to for PV systems.
- Inverter compliance with CEI 0-21 protection requirements must be confirmed, not assumed.
What Italy Actually Changes About Solar Design Software
Two connection standards, one threshold. CEI 0-21 covers connection of active and passive users to low-voltage networks, and CEI 0-16 covers medium and high voltage. Which applies depends on the connection level, and the difference is substantial: protection requirements, interface device arrangements, and testing obligations all change. A design that assumes the low-voltage path for a project that will connect at medium voltage has to be redone.
The TICA is the timeline. The connection request submitted to the distribution operator, principally e-distribuzione, produces a technical and economic connection proposal. Acceptance, works, and activation follow. For commercial projects this process, not the installation, is usually the long pole, and the design has to be settled enough to submit it.
The GSE sits in the middle. The Gestore dei Servizi Energetici administers the national mechanisms for withdrawal and incentives. Its documentation requirements are specific, and the design package has to support them.
CEI 82-25 is the design reference. Italian technicians work to CEI 82-25 as the guide for PV system design and installation. It is not something an international platform templates, which again points to editable output.
Incentives keep moving. Italy’s tax deduction regimes, including the wind-down of the enhanced Superbonus rates, have changed repeatedly. Any figure carried in a design or proposal should be verified against the current position rather than a remembered one.
The Platforms Ranked for Italy
| Platform | Best for | Hourly modelling | Editable CAD output | Price per seat per year |
|---|---|---|---|---|
| Italian market tools | Domestic workflow and compliance docs | Yes | Limited | Subscription, EUR |
| SurgePV | Commercial layout, SLD, proposal | Yes, 8,760-hour | DXF and DWG | $1,299 to $1,899 |
| PVsyst | Financed and larger commercial | Yes | No | ~$500 |
| HelioScope | Fast commercial rooftop layouts | Yes | DXF only | ~$1,188 |
| PVCase | Utility-scale ground-mount layout | Via PVsyst | Native CAD | Quote-based |
| OpenSolar | Low-volume domestic | Yes | No | $0 plus transaction fees |
| AutoCAD | Final sets for TICA and GSE | Not applicable | Native | ~$2,030 |
Italian-market tools carry the compliance documentation workflow that international platforms do not, which matters most on domestic work where the paperwork dominates the effort.
SurgePV covers commercial layout, string design, single-line diagrams, and editable DWG for correction to CEI conventions.
PVsyst is the model Italian banks and independent engineers expect on financed work. See PVsyst price and PVsyst alternatives.
PVCase suits Italy’s utility-scale ground-mount pipeline. See PVCase vs PVsyst for ground-mount.
Try the software behind this guide
Get the design settled early so the TICA can go in
SurgePV produces the 3D layout, 8,760-hour yield, string design, single-line diagram, and editable AutoCAD DWG export so the connection request is not waiting on drawings.
Book a free SurgePV demo →No credit card. 20-minute walkthrough on one of your own projects.
What an Italian Design Package Has to Contain
- Layout with module positions, orientation, and mounting detail.
- Single-line diagram with the interface protection arrangement required by CEI 0-21 or CEI 0-16 depending on connection level.
- Inverter compliance evidence against the applicable CEI standard’s protection functions.
- Connection request package supporting the TICA submission to the distribution operator.
- GSE documentation for the applicable withdrawal or incentive mechanism.
- Design documentation consistent with CEI 82-25 practice.
- Structural assessment including wind and, in northern regions, snow loading.
- Testing and commissioning records as required for activation.
Item 2 is where the low-voltage and medium-voltage paths genuinely diverge, and getting the connection level wrong early is the most expensive mistake available on an Italian commercial project.
Pricing in Euro
| Stack | Annual cost | Covers |
|---|---|---|
| OpenSolar | €0 plus fees | Basic domestic design |
| PVsyst | ~€460 | Yield modelling |
| HelioScope | ~€1,093 | Commercial layout and yield |
| SurgePV | ~€1,195 to €1,747 | Layout, SLD, DWG, proposal |
| Italian market tools | Quoted in EUR | Domestic workflow and compliance |
Dollar-quoted figures converted at an illustrative 0.92.
What Most Italian Installers Get Wrong
They start the design before confirming the connection level.
Whether a project connects at low or medium voltage determines which CEI standard governs, what interface protection is required, and how long the TICA process takes. Teams that size the array first and confirm the connection later frequently discover the project crosses the threshold and the protection scheme has to change. That is a redesign, and it happens after the customer has a price.
The second mistake is quoting an incentive rate from memory. Italy’s deduction regimes have changed repeatedly in recent years, and stating an outdated rate in a customer-facing document is a problem that surfaces at claim time.
When Software Is Not the Answer
Italian commercial and utility work turns on engineering: terrain-aware ground-mount layout, foundation design, structural calculations, and owner’s engineer support.
Our solar ground mount design, solar civil and structural engineering, STAAD Pro report calculations, and MW-scale project management consultancy services cover that. See our projects or talk to our team.
Conclusion
- Confirm the connection level before designing. CEI 0-21 and CEI 0-16 imply different protection schemes, and crossing the threshold late means a redesign.
- Submit the TICA as early as the design allows. The connection process, not the installation, is usually the critical path.
- Verify the current incentive position. Italian deduction regimes have changed repeatedly and stale figures cause claim problems.
In this country series: solar software in Italy, best solar proposal software in Italy, shading analysis software in Italy, Pvsyst review. Tool deep dives: Helioscope review, Aurora Solar review.
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Disclosure and accuracy note
Commercial relationship. Heaven Designs and SurgePV are part of the same group. Treat our recommendation of SurgePV as a vendor making its own case, not an independent verdict. We have tried to describe every other product fairly, and to say plainly where a competitor is the better choice.
Pricing. All prices are indicative, compiled from public sources when this page was written. They vary by tier, region, contract term and exchange rate, and change without notice. Several vendors quote rather than publish, and some price in currencies other than the US dollar, so a converted figure moves with the exchange rate. Confirm current pricing with the vendor before you decide anything.
Trademarks and corrections. All product names and trademarks belong to their respective owners, and are used here for identification and comparison only. Their use does not imply affiliation with or endorsement by those companies. If anything here is out of date or wrong, tell us and we will correct it.
FAQ
What is the best solar design software in Italy? An Italian-market tool for domestic work, because compliance documentation dominates the effort, and SurgePV or PVsyst for commercial depending on whether you need drawings or a bankable yield report.
What is the difference between CEI 0-21 and CEI 0-16? CEI 0-21 governs connection to low-voltage networks and CEI 0-16 governs medium and high voltage. They impose different protection, interface device, and testing requirements, so the connection level has to be established early.
What is the TICA? The connection request process run through the distribution operator, which produces a technical and economic connection proposal. On commercial projects it is usually the longest step in the schedule.
What does the GSE do? The Gestore dei Servizi Energetici administers national mechanisms for energy withdrawal and incentives, and its documentation requirements shape what the design package has to contain.
Does any software emit Italian compliance documentation? Italian-market tools handle much of it. International platforms do not, so choose one with editable CAD output and let an Italian technician complete the package.
How much does solar design software cost in Italy? From €0 with OpenSolar to roughly €1,750 per user per year for a full design and proposal license, with Italian-market licences quoted separately. Full math is in our solar design software pricing breakdown.
What about proposal software specifically? Covered in best solar proposal software in Italy.
What about shading analysis specifically? Shading is a separate tool decision at Italy’s latitude and approval regime. Covered in best solar shading analysis software in Italy.
