Spain has Europe’s best solar resource and one of its most administratively demanding installation processes. The design work is the easy part. The legalizacion, the process of registering the installation with the regional authority and the distribution company, is where Spanish projects consume time, and it runs on documentation that no design platform produces. Choosing software for the Spanish market therefore means choosing for what feeds that paperwork, not for what looks good in a demo.
Direct answer. The best solar design software in Spain for most installers is SurgePV or PVsyst for commercial work, with a Spanish-market tool for domestic autoconsumo. RD 244/2019 governs self-consumption and the REBT, specifically ITC-BT-40, governs the installation. No international platform emits either natively, so editable CAD output and a clean memoria tecnica input set are what matter.
TL;DR
- RD 244/2019 defines the self-consumption regimes, including whether the installation exports and whether it is shared.
- The REBT, particularly ITC-BT-40, governs generator installations connected to the network.
- Legalizacion runs through the regional autonomous community and the distribution company. It is the real project timeline.
- Autoconsumo colectivo, shared self-consumption between nearby consumers, is a genuine Spanish design pattern with allocation coefficients to model.
- Compensacion simplificada credits surplus at a modest rate, so self-consumption still carries the payback.
What Spain Actually Changes About Solar Design Software
RD 244/2019 sets the regime. The royal decree defines self-consumption categories, including installations without surplus, with surplus eligible for simplified compensation, and with surplus outside that mechanism. The category chosen affects metering, contracting, and the paperwork, and it has to be decided during design rather than discovered afterwards.
The REBT governs the installation. The Reglamento Electrotecnico para Baja Tension, with ITC-BT-40 covering generating installations connected to the network, is the technical framework. Documentation, protection arrangements, and conductor sizing follow it, and a drawing set produced from a foreign template does not.
Legalizacion is the schedule. After installation, the project has to be registered with the autonomous community’s industry department and the distribution company, principally i-DE, e-distribucion, or UFD depending on region. Requirements vary by autonomous community, which means a national installer maintains several documentation templates. Design software feeds this process but does not run it.
Collective self-consumption is real. Autoconsumo colectivo allows several consumers near an installation to share its output according to agreed allocation coefficients. Designing for it means modelling not just generation but how it is divided, which is a different exercise from a single-customer system.
Surplus is compensated modestly. Compensacion simplificada credits surplus against the customer’s bill at a rate well below the retail price. As elsewhere in Europe, that makes self-consumption the value driver and hourly modelling necessary.
The Platforms Ranked for Spain
| Platform | Best for | Hourly self-consumption | Collective allocation | Editable CAD output | Price per seat per year |
|---|---|---|---|---|---|
| SurgePV | Commercial layout, SLD, proposal | Yes, 8,760-hour | Via hourly output | DXF and DWG | $1,299 to $1,899 |
| PVsyst | Financed and larger commercial | Yes | Via hourly output | No | ~$500 |
| Spanish market tools | Domestic autoconsumo workflow | Yes | Often native | Limited | Subscription, EUR |
| HelioScope | Fast commercial rooftop layouts | Yes | Manual | DXF only | ~$1,188 |
| PVCase | Utility-scale ground-mount layout | Via PVsyst | Not applicable | Native CAD | Quote-based |
| OpenSolar | Low-volume domestic | Yes | Manual | No | $0 plus transaction fees |
| AutoCAD | Final sets for legalizacion | Not applicable | Not applicable | Native | ~$2,030 |
SurgePV produces the layout, string design, single-line diagram, and editable DWG that a Spanish technician turns into the memoria tecnica and legalizacion package.
PVsyst is what Spanish banks and independent engineers accept on financed projects, and Spain has plenty of those. See PVsyst price.
PVCase is the practical tool for Spain’s substantial utility-scale ground-mount pipeline. See PVCase vs PVsyst for ground-mount.
Try the software behind this guide
Design once, feed the legalizacion pack from the same model
SurgePV gives you 3D layout, 8,760-hour generation and self-consumption modelling, string design, single-line diagrams, and editable AutoCAD DWG export from one license.
Book a free SurgePV demo →No credit card. 20-minute walkthrough on one of your own projects.
What a Spanish Design Package Has to Contain
- Layout with module positions, orientation, and mounting detail.
- Single-line diagram with protection and isolation to REBT ITC-BT-40.
- Self-consumption regime declared under RD 244/2019, including whether surplus is exported and under which compensation mechanism.
- Metering arrangement consistent with the declared regime.
- Memoria tecnica or proyecto, depending on installation size, prepared for the autonomous community’s process.
- Distribution company documentation for the connection, to i-DE, e-distribucion, UFD, or the relevant operator.
- Structural assessment of the roof or mounting structure, including wind loading.
- Allocation coefficients where the installation serves collective self-consumption.
Item 3 is decided at design time and it constrains everything downstream. Choosing the wrong regime means redoing the paperwork, which in Spain is the expensive part.
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 |
| Spanish market tools | Quoted in EUR | Domestic autoconsumo workflow |
Dollar-quoted figures converted at an illustrative 0.92.
What Most Spanish Installers Get Wrong
They design for peak sun and ignore the load curve.
Spain has enough irradiance that a south-facing array produces a large, sharp midday peak. If the customer is a household empty during the day, most of that peak is exported at a compensation rate well below retail, and the payback is much worse than the generation figure implies. Spanish commercial customers with daytime load are a far better fit, and the design for a residential customer often should be smaller, west-shifted, or paired with storage.
The second mistake is treating legalizacion as a formality handled after installation. Requirements differ by autonomous community, and a project designed without checking the local process ends up waiting.
When Software Is Not the Answer
Spain’s ground-mount pipeline is substantial, and utility-scale work is engineering rather than software: terrain-aware layout, foundation design against local geotechnical data, and structural calculation packages.
Our solar ground mount design, site survey and land feasibility, and STAAD Pro report calculations services cover that, with MW-scale project management consultancy for owner’s engineer support. See our projects or talk to our team.
Conclusion
- Declare the RD 244/2019 regime during design. It drives metering, contracting, and the paperwork, and changing it later is expensive.
- Model the load curve, not just the resource. Spanish irradiance produces a sharp midday peak that a daytime-empty household cannot use.
- Check the autonomous community’s legalizacion requirements first. They vary, and they are the real project timeline.
In this country series: solar software in Spain, best solar proposal software in Spain, shading analysis software in Spain, Pvsol review. Tool deep dives: Pvcase review, Pvsyst review.
More from our network
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 Spain? SurgePV or PVsyst for commercial work depending on whether you need drawings or a bankable yield report, and a Spanish-market tool for domestic autoconsumo. PVCase for utility-scale ground-mount layout.
What is RD 244/2019? The royal decree governing self-consumption in Spain. It defines the categories of installation, including whether surplus is exported and how it is compensated, and the choice affects metering and contracting.
Does any software produce the memoria tecnica? No. Design platforms produce the drawings and calculations that feed it, but the memoria tecnica or proyecto is prepared for the autonomous community’s process by a competent technician.
What is autoconsumo colectivo? Collective self-consumption, where several nearby consumers share the output of one installation according to agreed allocation coefficients. Designing for it means modelling how generation is divided, not just how much there is.
Why does self-consumption matter if Spain has so much sun? Because surplus is credited under compensacion simplificada at a rate well below retail. Generating a lot is not the same as saving a lot if the customer is not there to use it.
How much does solar design software cost in Spain? From €0 with OpenSolar to roughly €1,750 per user per year for a full design and proposal license. Full math is in our solar design software pricing breakdown.
What about proposal software specifically? Covered in best solar proposal software in Spain.
What about shading analysis specifically? Shading is a separate tool decision at Spain’s latitude and approval regime. Covered in best solar shading analysis software in Spain.
