Best Solar Proposal Software in Spain (2026)

TL;DR: Spain’s solar proposal needs are unique: autoconsumo economics under RD 244/2019, IBI/ICIO tax modeling, and OMIE wholesale pricing that most international tools ignore. SurgePV delivers automated design-to-proposal with Spanish financial calculators at ~EUR 1,750/year. Aurora Solar offers polished visuals but no Spanish tax modeling. OpenSolar is free but generic. For Spanish instaladores who close deals based on accurate autoconsumo projections, proposal software with IBI calculators is not optional.

Spanish homeowners compare 3-6 solar quotes.

Your proposal lands third in the inbox. First instalador showed IBI tax savings of EUR 450/year for 3 years. Second showed ICIO construction tax deductions of EUR 2,100. Your proposal shows… generic “savings estimates” with no Spanish tax line items.

You just lost to competitors using proposal software built for Spain.

After the “Impuesto al Sol” (Sun Tax) was abolished in 2018, Spain became Europe’s second-largest solar market, adding 5+ GW annually. Under RD 244/2019, autoconsumo individual and autoconsumo colectivo exploded. Residential installations under 15 kWp are the fastest-growing segment.

But Spain’s financial modeling is completely different from Northern Europe. Surplus energy under compensacion simplificada is valued at OMIE wholesale prices (EUR 50-70/MWh in 2025), not retail rates (EUR 150+/MWh). IBI property tax reductions, ICIO construction tax deductions, and IRPF income tax benefits create ROI advantages that proposals without Spanish tax calculators simply cannot capture.

A proposal tool that works in Munich does not work in Malaga. Not because Spanish customers are different, but because Spanish financial incentives are different. When your competitor’s proposal shows EUR 18,000 in IBI/ICIO/IRPF tax benefits over 25 years and yours does not, the homeowner assumes you did not do the research.

Spain is Europe’s second-largest solar market with regulations designed to accelerate residential and commercial adoption. Proposals that model these regulations close faster.

For the broader Spanish solar software market, see our best solar software in Spain guide. We tested the top solar proposal software platforms specifically for the Spanish market. We ran real proposals on residential autoconsumo projects in Madrid, Barcelona, Valencia, Sevilla, and Malaga. We evaluated each tool on autoconsumo modeling, IBI/ICIO/IRPF calculators, OMIE pricing integration, Spanish-language support, and automated SLD generation for municipal permit applications.

In this guide, you’ll learn:

• Which 5 proposal platforms handle Spanish autoconsumo and tax modeling best
• Why IBI, ICIO, and IRPF calculators separate winning proposals from generic estimates
• How to model OMIE wholesale pricing instead of retail rates for surplus compensation
• Which tools generate Spanish-language proposals with EUR financial modeling
• What Spanish regulations (RD 244/2019, PVPC tariffs, CTE HE-5) mean for your proposals
• Our recommendation by business type: instalador, ingenieria, or promotor

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Quick Comparison: 5 Best Solar Proposal Tools for Spanish Installers

Feature	SurgePV	Aurora Solar	OpenSolar	Solargraf	Enact Solar
Best For	Autoconsumo with Spanish tax modeling	Polished residential proposals	Budget-conscious installers	Quick residential quotes	US residential sales
Spanish Language	Yes	Limited	Yes	Partial	English-primary
IBI/ICIO/IRPF Modeling	Full calculators	No	No	No	No
Autoconsumo Modeling	Full (individual + colectivo)	Basic	Basic	Limited	No
OMIE Pricing	Integrated	Not native	Manual input	Not native	Not native
PVPC Tariff Analysis	3-period (punta/llano/valle)	No	No	No	No
Automated SLD	Yes (5-10 min)	No	No	No	No
Spanish Tax Calculator	Yes	No	No	No	No
Platform	Cloud	Cloud	Cloud	Cloud	Cloud
Price (EUR/year)	~1,750 (3 users)	3,600-7,200+	Free-1,800	1,200-2,400	2,400-4,800
Our Rating	9.3/10	8.0/10	7.5/10	6.8/10	6.5/10

Quick verdict: For Spanish residential and commercial installers handling autoconsumo projects, SurgePV offers the only integrated platform with IBI/ICIO/IRPF tax modeling, OMIE pricing, and automated SLD generation. Aurora Solar creates beautiful proposals but requires manual Spanish financial modeling in Excel. OpenSolar is the best free option but has no Spanish tax features.

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Why Spanish Solar Proposals Require Specialized Financial Modeling

Generic solar software misses what makes Spanish solar economics different. Before comparing specific platforms, here is why Spain demands specialized proposal capabilities.

IBI Tax Reductions — The #1 Incentive Spanish Homeowners Ask About

IBI (Impuesto sobre Bienes Inmuebles) is Spain’s annual property tax. Most Spanish municipalities offer IBI reductions of 25-50% for 3-5 years for residential solar installations.

For a typical home in Madrid with EUR 900/year IBI, a 50% reduction for 3 years saves EUR 1,350. For a commercial property in Barcelona with EUR 3,500/year IBI, a 50% reduction for 5 years saves EUR 8,750.

When a Spanish homeowner compares proposals, the one that shows “EUR 1,350 IBI tax savings (50% reduction, 3 years, Madrid municipal rate)” builds instant credibility. The one that shows generic “tax incentives available” looks like the instalador did not research local regulations.

ICIO Construction Tax Deductions — The Upfront Savings That Close Deals

ICIO (Impuesto sobre Construcciones, Instalaciones y Obras) is Spain’s construction tax, typically 2-4% of project cost. Many municipalities offer ICIO deductions of 50-95% for solar installations.

For a EUR 12,000 autoconsumo installation with 4% ICIO base rate (EUR 480), a 95% deduction saves EUR 456 upfront. That is cash savings at installation, not over 25 years.

Spanish homeowners understand ICIO. When your proposal line-items “EUR 456 ICIO deduction (95%, municipality rate)” versus a competitor showing “EUR 12,000 total cost” with no ICIO mention, you just demonstrated local expertise.

IRPF Income Tax Deductions — The Overlooked 60% Benefit

IRPF (Impuesto sobre la Renta de las Personas Fisicas) is Spain’s income tax. Under certain conditions, Spanish taxpayers can deduct up to 60% of solar installation costs from taxable income for energy efficiency improvements.

For a EUR 12,000 installation, 60% IRPF deduction (EUR 7,200) applied to a 25% tax bracket saves EUR 1,800 in income taxes.

This is a one-time deduction, not annual. But for Spanish homeowners, it is often larger than 3 years of IBI savings.

IRPF deductions apply when installations meet Spanish building energy code (CTE HE-5) efficiency requirements. Proposal software that does not calculate whether your system qualifies creates unrealistic expectations.

OMIE Wholesale Pricing — Why Surplus Compensation Varies 200% Seasonally

Spain’s autoconsumo con excedentes (self-consumption with surplus) compensates exported energy at OMIE monthly average spot prices, not retail electricity rates.

In 2025, OMIE averaged EUR 50-70/MWh. Retail electricity averaged EUR 150+/MWh. That is a 2-3x difference.

Proposal tools that model surplus at retail rates create ROI projections that are 30-50% too optimistic. When the homeowner’s actual compensation is 40-60% lower than your proposal predicted, that is a customer satisfaction problem.

Accurate Spanish proposals must use OMIE wholesale pricing for surplus compensation. Tools that default to retail rates (or let users manually enter a “compensation rate” with no OMIE integration) produce proposals that look great on paper but do not match real cash flow.

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The 5 Best Solar Proposal Software Platforms for Spain (2026)

SurgePV — Best Design-to-Proposal Platform with Spanish Tax Modeling

Rating: 9.3/10 | Price: ~EUR 1,750/year (3 users) | Book a demo | See pricing

SurgePV is a cloud-based solar design and proposal platform that combines design, electrical engineering, financial modeling, and customer-facing proposals in one workflow. For Spanish installers and EPCs handling residential and commercial autoconsumo projects, it eliminates the need to switch between design software, Excel tax calculators, and PDF proposal generators.

Why SurgePV works for the Spanish market:

The platform includes Spanish-specific financial modeling that no other tool matches. IBI calculators with municipality-specific rates for 500+ Spanish cities. ICIO construction tax deductions. IRPF income tax modeling. PVPC 3-period tariff analysis (punta, llano, valle). And autoconsumo modeling with integrated OMIE wholesale pricing for surplus compensation.

For a typical 8 kWp residential autoconsumo project in Madrid, SurgePV automatically calculates:

• IBI savings: EUR 450/year for 3 years (50% reduction, Madrid municipal rate) = EUR 1,350 total
• ICIO deduction: EUR 456 upfront (95% of EUR 480 construction tax)
• IRPF deduction: EUR 7,200 (60% of EUR 12,000 installation cost)
• Surplus compensation: OMIE wholesale rate (~EUR 60/MWh) instead of retail (EUR 150+/MWh)
• PVPC hourly optimization: Higher self-consumption during punta (peak) periods when electricity costs EUR 0.25-0.35/kWh

The proposal output is in Spanish with EUR pricing and Spanish financial terminology (autoconsumo, compensacion simplificada, IBI, ICIO, IRPF). No manual Excel spreadsheets. No English-language templates that need translation.

SurgePV also generates automated single line diagrams in 5-10 minutes, critical for Spanish municipal permit applications and distribuidor grid connection requests (Endesa, Iberdrola, Naturgy, EDP). Traditional outsourced CAD drafting for Spanish projects costs EUR 300-1,500 per project with 2-5 day turnaround. SurgePV eliminates that bottleneck entirely.

Mini case study: A Barcelona-based instalador switched from Aurora Solar + Excel to SurgePV for residential autoconsumo proposals. Aurora created beautiful proposals in 20 minutes, but the instalador spent another 45 minutes in Excel calculating IBI (Barcelona municipal rate), ICIO (95% deduction), and IRPF (60% deduction), then manually copying data into the Aurora proposal.

With SurgePV’s integrated Spanish tax calculators, the entire proposal — design, financial modeling, IBI/ICIO/IRPF calculations, OMIE pricing, and Spanish-language output — took 25 minutes total. Result: 60% time savings per proposal and zero manual tax calculation errors. The instalador’s closing rate improved 18% because homeowners saw detailed local tax benefits instead of generic “incentives available” language.

Reader objection: “Aurora Solar is the industry standard for residential — when does SurgePV make more sense?” Aurora creates polished proposals faster than any platform. But it has zero Spanish financial modeling. No IBI calculator. No ICIO. No IRPF. No OMIE pricing. No PVPC tariff analysis. If you are a Spanish instalador, you will spend 30-60 minutes in Excel after Aurora finishes, then manually re-enter data. SurgePV does it all in one workflow with Spanish tax calculators built in. For Spanish autoconsumo projects, SurgePV’s integrated approach beats Aurora + Excel.

Pros:

• Only platform with integrated IBI/ICIO/IRPF Spanish tax calculators
• Full autoconsumo modeling (individual + colectivo) with OMIE pricing
• PVPC 3-period tariff analysis (punta/llano/valle optimization)
• Spanish-language proposals with EUR financial modeling
• Automated SLD generation (5-10 min vs 2-5 days outsourced)
• Bankable P50/P75/P90 yield forecasts (+-3% vs PVsyst)
• 70,000+ projects globally, 3-minute average support response
• ~EUR 1,750/year for 3 users — all features included

Cons:

• Newer brand in Spain compared to Aurora Solar’s global presence
• Developing advanced autoconsumo colectivo multi-dwelling features
• Less established Spanish sales team (India-based company)

Best for: Spanish instaladores and EPCs handling residential autoconsumo (3-100 kWp) and commercial projects (50-500 kWp) who want design, Spanish tax modeling, and proposals in one platform without Excel spreadsheets.

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Aurora Solar — Most Polished Proposal Experience, No Spanish Financial Modeling

Rating: 8.0/10 | Price: EUR 3,600-7,200+/year | Aurora Solar | Aurora Solar review

Aurora Solar is the global leader in residential solar design and proposals. For high-volume Spanish installers processing large numbers of residential quotes in metro areas like Madrid, Barcelona, and Valencia, Aurora’s AI-powered design speed and proposal polish are industry-leading.

Why Aurora has a role in the Spanish market:

Aurora’s AI roof detection creates panel layouts in minutes using satellite imagery. The 3D visualization is the most photorealistic in the industry. Spanish homeowners can see exactly what their rooftop will look like with modules installed. The proposal interface is mobile-friendly, interactive, and professionally branded.

For pure residential volume (30+ quotes per week), Aurora’s speed advantage is real. An experienced user can go from address input to customer-facing proposal in 15-20 minutes.

Here is where it gets complicated for Spain.

Aurora was built for the US market. It does not model compensacion simplificada under RD 244/2019. OMIE wholesale pricing is not built in. There is no PVPC 3-period tariff analysis. IBI and ICIO tax benefit calculators are absent. IRPF income tax deductions are not supported. And the interface is primarily English — Spanish language support is limited.

Speed without Spanish financial accuracy creates proposals that look beautiful but lack the local tax details that Spanish homeowners compare across quotes. An Aurora proposal shows generic “25-year savings: EUR 28,000” without IBI/ICIO/IRPF line items. Your competitor using SurgePV shows “EUR 1,350 IBI savings + EUR 456 ICIO + EUR 1,800 IRPF + EUR 24,394 electricity savings = EUR 28,000 total.” Same total, but one proposal demonstrates local expertise.

Pros:

• Industry-leading AI roof detection and design speed
• Most polished, photorealistic 3D visualization
• Professional interactive proposals (mobile-friendly)
• Strong brand recognition globally
• Native Salesforce/HubSpot CRM integration
• Cloud-based, fast onboarding

Cons:

• No IBI/ICIO/IRPF Spanish tax calculators
• No OMIE pricing integration
• No compensacion simplificada modeling under RD 244/2019
• No PVPC 3-period tariff analysis
• English-primary interface — limited Spanish language
• No autoconsumo colectivo modeling
• No automated SLD generation (requires separate AutoCAD for electrical)
• Premium pricing tier (EUR 3,600-7,200+/year)

Best for: High-volume Spanish residential installers in metro areas (Madrid, Barcelona, Valencia, Sevilla) who prioritize proposal speed and visual polish over Spanish-specific financial modeling. Best paired with Excel tax calculators for IBI/ICIO/IRPF calculations.

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OpenSolar — Best Free Proposal Option for Budget-Conscious Spanish Installers

Rating: 7.5/10 | Price: Free-EUR 1,800/year | OpenSolar | OpenSolar review

OpenSolar is the most affordable full-featured proposal platform, offering a free tier that includes design, proposals, and basic financial modeling. For Spanish installers starting out or handling low monthly volumes (under 10 projects/month), OpenSolar’s zero-cost entry is unmatched.

Why OpenSolar works for Spain:

The free tier includes enough functionality for basic residential proposals: design, shading analysis, financial modeling with cash/loan/lease options, and PDF proposal export. The interface is available in Spanish. And OpenSolar has transparent pricing — no “contact sales” required.

For a small Spanish instalador doing 5-10 residential autoconsumo projects per month, OpenSolar provides a functional proposal workflow at zero cost. That is a real advantage when starting out.

Here is where it falls short for Spain.

OpenSolar has no Spanish financial modeling. No IBI calculator. No ICIO. No IRPF. No OMIE pricing integration. No PVPC tariff analysis. Financial modeling uses generic utility rate inputs — you can manually enter a “compensation rate” for surplus energy, but there is no OMIE dynamic pricing.

OpenSolar creates functional proposals quickly, but Spanish tax benefits require manual Excel calculations and re-entry. For installers handling higher volumes (20+ projects/month), that manual workflow becomes a bottleneck.

Pros:

• Free tier available (best value for low-volume installers)
• Transparent pricing (no sales call required)
• Spanish-language interface
• Basic design and proposal tools included
• Cloud-based, easy onboarding (1-2 weeks)
• Good for residential focus

Cons:

• No IBI/ICIO/IRPF Spanish tax calculators
• No OMIE pricing integration
• No PVPC tariff analysis
• Limited autoconsumo modeling
• No automated SLD generation
• Free tier has feature limitations (storage modeling, advanced reports)

Best for: Budget-conscious Spanish installers handling low monthly volumes (under 10 projects/month) who can manually calculate IBI/ICIO/IRPF in Excel. Good starting point before upgrading to platforms with integrated Spanish financial modeling.

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Solargraf — Quick Residential Proposals from Satellite Imagery, No Spanish Financial Features

Rating: 6.8/10 | Price: EUR 1,200-2,400/year | Solargraf | Solargraf review

Solargraf is a satellite-based solar design software and proposal platform focused on speed for residential installers. For Spanish installers doing high-volume residential prospecting (50+ leads per week), Solargraf’s satellite imagery workflow creates quick preliminary proposals without site visits.

Why Solargraf has a niche in Spain:

Solargraf generates proposals directly from satellite imagery and address data. No manual roof modeling. For initial lead qualification (is this roof viable for solar?), Solargraf produces ballpark estimates in minutes.

Spanish installers using Solargraf for prospecting can filter viable leads before scheduling site visits, improving sales efficiency.

Here is where it breaks down for closing deals in Spain.

Solargraf has no Spanish financial modeling. No IBI. No ICIO. No IRPF. No OMIE pricing. No PVPC tariffs. Financial projections are generic retail rate assumptions. And for commercial projects or complex residential layouts, satellite-only design lacks the accuracy Spanish customers expect in final proposals.

Solargraf works for lead qualification (“Yes, your roof can support solar”) but not for competitive final proposals in the Spanish market. You will need a second platform (SurgePV, Aurora) for proposals that include Spanish tax calculations.

Pros:

• Fastest initial proposal generation (satellite-only workflow)
• Good for high-volume lead prospecting
• No site visit required for preliminary quotes
• Transparent pricing

Cons:

• No Spanish financial modeling (IBI/ICIO/IRPF)
• No OMIE pricing or PVPC tariff analysis
• Satellite-only design less accurate than manual/AI modeling
• Limited commercial capabilities
• No automated SLD generation
• Not suitable for final competitive proposals in Spanish market

Best for: Spanish residential installers doing high-volume lead prospecting who need quick preliminary estimates before investing in detailed site visits. Not recommended as primary proposal tool for closing deals.

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Enact Solar — US-Focused Solar Sales Platform, Not Recommended for Spanish Domestic Projects

Rating: 6.5/10 | Price: EUR 2,400-4,800/year | Enact Solar | Enact Solar review

Enact Solar is a US-focused solar sales and proposal platform designed for high-volume residential installers. It combines CRM, proposal generation, and sales automation in one workflow.

Why Enact Solar does not fit the Spanish market:

Enact was built specifically for the US residential solar market. US-specific financing (PACE, solar loans, PPAs), US utility structures, and US incentive programs (ITC federal tax credit, state rebates) are core to the platform.

For Spanish domestic projects, Enact has no autoconsumo modeling, no IBI/ICIO/IRPF calculators, no OMIE pricing, and no Spanish regulatory support. The interface is English-only. Financial modeling assumes US utility rate structures and financing products that do not exist in Spain.

Enact Solar is a strong platform for US residential solar sales teams. It has no applicability to Spanish autoconsumo projects. Spanish installers should not consider Enact.

Pros:

• Strong US residential sales automation
• Integrated CRM for high-volume lead management
• US financing product support

Cons:

• Zero Spanish market applicability
• No autoconsumo, IBI, ICIO, IRPF, OMIE, or PVPC support
• English-only interface
• US-focused pricing and financing models
• Not recommended for Spanish projects

Best for: Not recommended for Spanish installers. Included in this comparison only for completeness. Spanish installers should use SurgePV, Aurora, or OpenSolar instead.

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Solar Drafting Services in Spain: From Manual CAD to Automated Engineering

If you are looking for solar drafting services in Spain, you are dealing with one of two bottlenecks: outsourced CAD engineers or in-house AutoCAD staff who cannot keep up.

Every grid connection application to your distribuidor (Endesa, Iberdrola, Naturgy, EDP) requires technical documentation. Commercial installations above 15 kW need a proyecto tecnico signed by an ingeniero. Even residential autoconsumo systems need a memoria tecnica with single-line diagrams.

Traditional solar drafting services in Spain cost EUR 300-1,500 per project depending on complexity. Commercial projects run higher. Turnaround: 2-5 business days. At 30+ projects per month, that is EUR 9,000-45,000 annually in drafting costs alone, and 60-150 business days of waiting.

What integrated proposal software replaces:

• Single-line diagrams (SLDs) — SurgePV generates IEC-compliant SLDs automatically in 5-10 minutes. No AutoCAD license (saves ~EUR 2,000/year), no external drafting service.
• Wire sizing calculations — Automated conductor sizing per REBT (Reglamento Electrotecnico para Baja Tension) standards.
• Equipment specifications — Complete BOM with 98% accuracy from a database of 70,000+ components.
• Permit-ready documentation — Technical packages that meet distribuidor requirements across all 17 Comunidades Autonomas.
• Memoria tecnica components — System specs, protection schemas, and installation parameters that support the engineering sign-off process.

For Spanish EPCs doing both residential and commercial work, eliminating the drafting bottleneck means same-day proposals. Your customer in Madrid or Barcelona gets a complete technical and financial package before your competitor’s drafting service finishes their first drawing.

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The Financial Details That Win Spanish Solar Deals

Spanish solar proposals compete on financial details, not just system size or pricing. Here is what separates winning proposals from generic estimates.

IBI (Property Tax) Reductions — Municipality-Specific Rates Matter

IBI reductions are the #1 financial incentive Spanish homeowners ask about. But the reduction percentage and duration vary by municipality.

Regional IBI Variations (2026):

• Madrid (capital): Up to 50% IBI reduction for 3 years
• Barcelona: Up to 50% IBI reduction for 3 years
• Valencia: Up to 50% IBI reduction for 5 years
• Sevilla: Up to 50% IBI reduction for 3 years
• Malaga: Up to 50% IBI reduction for 3 years
• Alicante: Up to 50% IBI reduction for 5 years
• Zaragoza: Up to 50% IBI reduction for 3 years

These municipal rates change annually. SurgePV’s proposal engine includes updated IBI rates for 500+ Spanish municipalities, so proposals automatically reflect the correct local tax benefits.

ICIO (Construction Tax) Deductions — Upfront Cash Savings

ICIO is Spain’s construction tax on installations. Most municipalities charge 2-4% of project cost but offer 50-95% deductions for renewable energy.

For a EUR 12,000 installation:

• ICIO base (4%): EUR 480
• ICIO deduction (95%): EUR 456 saved upfront
• Net ICIO paid: EUR 24

That EUR 456 is cash savings at installation, not over 25 years. Spanish homeowners understand this — it reduces their upfront payment directly.

IRPF (Income Tax) Deductions — The 60% Benefit Most Proposals Miss

IRPF deductions apply when solar installations meet Spanish building energy code (CTE HE-5) efficiency improvements. Taxpayers can deduct up to 60% of installation costs from taxable income.

For a EUR 12,000 installation:

• IRPF deduction (60%): EUR 7,200
• Tax savings (25% bracket): EUR 1,800

This is a one-time deduction on the year’s tax return. For Spanish homeowners, it is often larger than multiple years of IBI savings combined.

Not all installations qualify for 60%. The system must demonstrate energy efficiency improvements per CTE HE-5. Proposal software that claims “60% IRPF deduction” without verifying CTE compliance creates unrealistic expectations.

PVPC Tariff Optimization — Why Hourly Self-Consumption Matters

Spain’s PVPC (Precio Voluntario para el Pequeno Consumidor) tariff has 3 periods with different electricity prices:

• Punta (peak): 10h-14h, 18h-22h weekdays — highest cost (EUR 0.25-0.35/kWh)
• Llano (mid): 8h-10h, 14h-18h, 22h-24h weekdays — medium cost (EUR 0.15-0.20/kWh)
• Valle (off-peak): 0h-8h all days + weekends — lowest cost (EUR 0.08-0.12/kWh)

Solar production peaks during punta periods. Self-consumption during punta saves EUR 0.25-0.35/kWh. Surplus exported during valle (weekends) earns OMIE wholesale (~EUR 0.06/kWh).

Proposals that model hourly PVPC optimization show Spanish homeowners that their system maximizes self-consumption during expensive periods and minimizes low-value export. Generic proposals using flat-rate electricity pricing miss this entirely.

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Spanish Energy Regulations That Impact Proposals

Proposal accuracy in Spain depends on modeling the regulatory framework. Here is what Spanish homeowners expect proposals to address.

RD 244/2019 — Autoconsumo Individual y Colectivo Framework

Spain’s RD 244/2019 defines autoconsumo categories:

Individual autoconsumo: One consumer, one PV installation. Surplus energy compensated monthly at OMIE wholesale price as bill credit (never exceeding bill value).

Autoconsumo colectivo: Multiple consumers sharing one PV installation. Energy allocation follows reparto de energia coefficients. Common in Spanish apartment buildings (comunidades de vecinos).

Proposals must specify which autoconsumo mode applies and model compensation accordingly. Tools that do not distinguish between individual and collective self-consumption create confusion for multi-dwelling projects.

Compensacion Simplificada — Monthly OMIE Surplus Compensation

Under compensacion simplificada, surplus PV energy is compensated at the OMIE monthly average spot price. This is NOT the retail rate.

Spanish proposals that model surplus at retail rates (EUR 0.15-0.25/kWh) instead of OMIE wholesale (EUR 0.05-0.07/kWh) will overestimate ROI by 30-50%.

CTE HE-5 — Building Energy Code Efficiency Requirements

Spain’s building energy code (Codigo Tecnico de la Edificacion, section HE-5) defines minimum renewable energy contribution requirements for new buildings and major renovations.

For new construction, proposals must demonstrate that the PV system meets the required solar fraction for the building’s specific zona climatica (I-V). This documentation is part of municipal permit applications.

For existing buildings, CTE HE-5 compliance enables IRPF tax deductions. Proposals claiming IRPF benefits should verify CTE alignment.

EU Next Generation Funds — Regional Subsidy Programs

Spain’s EU Next Generation recovery plan includes solar subsidies administered through IDAE and regional agencies. Subsidy amounts vary by Comunidad Autonoma and project type.

Proposal software should include subsidy calculators for regions where programs are active. SurgePV’s financial modeling includes EU Next Generation subsidy fields for applicable regions.

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Autoconsumo Colectivo: Spain’s Shared-Energy Proposal Challenge

Autoconsumo colectivo is a distinctly Spanish framework that creates proposal requirements no other European market shares at this scale.

How Collective Self-Consumption Works in Spanish Apartment Buildings

In Spanish comunidades de vecinos (homeowner associations for apartment buildings), a single rooftop PV installation can serve multiple dwelling units. Under RD 244/2019, each participating consumer receives an allocated share of generated energy based on agreed coefficients.

This is common in Spain because approximately 65% of Spaniards live in multi-dwelling buildings. The autoconsumo colectivo framework was specifically designed to let these residents access solar energy without individual rooftop access.

Reparto de Energia — Energy Allocation Coefficients per Dwelling

Each participant in autoconsumo colectivo receives energy according to fixed or dynamic reparto de energia coefficients. For example, a 30 kWp rooftop system serving 10 apartments might allocate 3 kWp equivalent per unit, adjusted for each apartment’s consumption profile.

Proposal software must model individual consumption profiles per dwelling unit, calculate self-consumption ratios per household, and determine surplus allocation per participant — all while maintaining correct OMIE compensation calculations for collective surplus.

Which Proposal Tools Handle Multi-User Modeling

SurgePV can model collective self-consumption scenarios with individual energy allocation per dwelling unit and ROI calculations per household. Aurora Solar has limited multi-dwelling capabilities. OpenSolar has no dedicated autoconsumo colectivo features.

Autoconsumo colectivo modeling is still evolving across all platforms. Spanish instaladores working in this segment should evaluate each tool’s specific multi-dwelling capabilities before committing.

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How to Choose the Right Proposal Tool for Your Spanish Business

The right tool depends on your company type, project scale, and financial modeling requirements. Here is a practical decision framework.

By Company Type (Instalador vs Ingenieria vs Promotor)

Spanish instalador (residential/commercial installer): You need speed, Spanish tax modeling (IBI/ICIO/IRPF), and autoconsumo proposals. SurgePV or Aurora Solar. SurgePV is stronger on Spanish financial modeling; Aurora is faster on pure residential volume but requires Excel tax calculations.

Ingenieria (engineering firm): You need accurate financial projections and technical documentation. SurgePV for integrated design-to-proposal with automated SLD generation.

Promotor (developer): You need scalable proposal workflows for multiple projects. SurgePV for commercial solar and autoconsumo colectivo projects.

By Project Scale (Residential Autoconsumo vs Commercial C&I)

For residential autoconsumo (3-15 kWp), SurgePV and Aurora Solar provide the speed and proposal capabilities needed for high-volume quoting. SurgePV adds IBI/ICIO/IRPF calculators; Aurora requires manual tax modeling.

For commercial autoconsumo (50-500 kWp), SurgePV’s combination of financial modeling, automated SLD generation, and Spanish tax calculators is the strongest single-platform option.

By Documentation Needs (Municipal Permits, Distribuidor Applications, CTE HE-5)

For municipal permit applications, proposals should include technical documentation (SLDs, wire sizing, BOM) that meets local requirements. SurgePV generates automated SLDs compliant with REBT standards.

For distribuidor grid connection applications (Endesa, Iberdrola, Naturgy, EDP), technical packages must include single-line diagrams and electrical specs. SurgePV’s automated SLD generation creates permit-ready documentation in 5-10 minutes.

For IDAE subsidy applications (EU Next Generation funds), financial projections must include IBI, ICIO, IRPF, and subsidy calculations, a capability that SurgePV provides natively.

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Conclusion: Which Solar Proposal Software Is Right for Your Spanish Business?

Spain’s solar market does not wait. OMIE prices move daily. Autoconsumo regulations continue evolving. And with Spain adding 5+ GW of solar capacity annually, the competition for residential and commercial projects intensifies every quarter.

Here is the bottom line by use case:

For residential autoconsumo (3-100 kWp): SurgePV delivers the best combination of Spanish financial modeling (IBI/ICIO/IRPF calculators, OMIE pricing, PVPC tariff analysis), automated SLD generation, and Spanish-language proposals at ~EUR 1,750/year for 3 users. Aurora Solar is an alternative for pure speed if you handle Spanish tax calculations separately in Excel.

For commercial and industrial (100 kWp - 1 MW): SurgePV covers design, Spanish financial modeling, automated SLD generation, and proposals in one platform. No Excel spreadsheets, no outsourced drafting services, no manual tax calculations.

For autoconsumo colectivo (apartment buildings, comunidades de vecinos): SurgePV models multi-dwelling energy allocation (reparto de energia) with individual ROI per household. Aurora and OpenSolar have limited collective self-consumption capabilities.

For budget-conscious installers (under 10 projects/month): OpenSolar’s free tier provides basic proposal functionality. Manual Spanish tax calculations required, but zero software cost.

Every week without solar software that includes Spanish financial modeling is another set of proposals showing generic “savings estimates” while competitors show “EUR 1,350 IBI + EUR 456 ICIO + EUR 1,800 IRPF.” Spanish homeowners compare 3-6 quotes. The instalador with municipality-specific tax details wins the contract.

OMIE prices move daily. IBI rates vary by municipality. Start proposing with Spanish financial accuracy. Book your demo. Compare pricing. Or explore all solar software reviews for additional comparisons.

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Frequently Asked Questions

What is the best solar proposal software for Spain in 2026?

SurgePV is the best solar proposal software for Spain in 2026. It combines automated design, IBI/ICIO/IRPF tax modeling, autoconsumo analysis with OMIE pricing, and automated SLD generation in one platform at approximately EUR 1,750/year for 3 users. Aurora Solar offers polished proposals for residential but lacks Spanish financial modeling and requires manual Excel calculations for tax benefits. OpenSolar is the most affordable free option but has no IBI/ICIO/IRPF calculators or OMIE pricing. The best choice depends on your project scale: residential autoconsumo (SurgePV, Aurora with Excel), commercial (SurgePV), or high-volume residential sales (Solargraf for quick preliminary quotes, SurgePV for final proposals).

How much does solar proposal software cost for Spanish installers?

Solar proposal software for Spain ranges from free (OpenSolar basic tier) to approximately EUR 1,750-8,000+/year. SurgePV costs approximately EUR 1,750/year for 3 users with all features included: IBI/ICIO/IRPF calculators, OMIE pricing, PVPC tariff analysis, automated SLD generation, and Spanish-language proposals. Aurora Solar pricing varies by market but typically ranges EUR 3,600-7,200+/year without Spanish tax modeling. Solargraf offers transparent pricing around EUR 1,200-2,400/year but lacks Spanish financial features. For Spanish installers handling 30+ autoconsumo projects per month, dedicated proposal software with Spanish financial modeling typically pays for itself within 1-2 months through faster closing rates and higher conversion.

Do Spanish solar proposals need to include IBI and ICIO tax benefits?

Yes. Spanish solar proposals must include IBI (Impuesto sobre Bienes Inmuebles) and ICIO (Impuesto sobre Construcciones, Instalaciones y Obras) tax benefits to be competitive in the Spanish market. These are among the most significant financial incentives for Spanish homeowners and businesses. IBI reductions typically range 25-50% for 3-5 years depending on municipality (Madrid, Barcelona, Valencia offer up to 50%). ICIO deductions range 50-95% on installation costs. Additionally, IRPF (income tax) deductions up to 60% apply under CTE HE-5 energy efficiency conditions. SurgePV includes Spanish-specific tax calculators with municipality-level IBI rates. Aurora Solar and OpenSolar do not natively support Spanish tax modeling.

Can solar proposal software model Spain’s autoconsumo regulations?

Yes. Proposal software targeting Spain must model RD 244/2019 autoconsumo regulations. This includes self-consumption ratios, surplus compensation at OMIE wholesale prices (not retail), PVPC 3-period tariff analysis (punta, llano, valle), and autoconsumo individual vs autoconsumo colectivo modes. SurgePV models autoconsumo individual and autoconsumo colectivo with integrated OMIE pricing and PVPC hourly optimization. Aurora Solar and OpenSolar do not natively support Spanish autoconsumo economics. Tools that use retail rates for surplus energy instead of OMIE wholesale pricing will overestimate ROI by 30-50% because surplus compensation under compensacion simplificada is valued at OMIE spot prices (EUR 50-70/MWh) rather than retail rates (EUR 150+/MWh).

What is OMIE and why does it matter for Spanish solar proposals?

OMIE (Operador del Mercado Iberico de Energia) operates the Iberian Peninsula electricity market covering Spain and Portugal. Under Spain’s autoconsumo con excedentes, surplus PV energy is compensated at the OMIE monthly average spot price as a bill credit, typically EUR 50-70/MWh in 2025, or 40-60% less than retail electricity rates (EUR 150+/MWh). Solar proposals that model surplus compensation at retail rates instead of OMIE wholesale pricing create unrealistic ROI projections. Accurate Spanish proposals must integrate OMIE dynamic pricing to show homeowners realistic payback timelines. SurgePV integrates OMIE wholesale pricing. Aurora Solar, OpenSolar, and Solargraf do not natively support OMIE pricing.

Are solar drafting services available through proposal software in Spain?

Yes. SurgePV provides automated solar drafting services including IEC-compliant single-line diagrams (SLDs), wire sizing calculations per REBT standards, and permit-ready technical documentation. This replaces traditional outsourced CAD drafting for Spanish installers, reducing engineering time from 2-5 days to under 10 minutes per project while meeting distribuidor requirements (Endesa, Iberdrola, Naturgy, EDP) across all 17 Comunidades Autonomas. Traditional solar drafting services in Spain cost EUR 300-1,500 per project. SurgePV eliminates this cost and turnaround time entirely.

Which Comunidades Autonomas offer the best solar incentives?

Solar incentives vary by region. Strong programs include: Andalucia (IBI + IRPF deductions), Cataluna (IBI up to 50% for 3 years), Comunidad Valenciana (IBI for 5 years + EU Next Generation funds), and Madrid (IBI + ICIO + EU Next Generation subsidies). SurgePV proposal software includes region-specific tax calculators for all 17 Comunidades Autonomas, automatically adjusting IBI, ICIO, and IRPF deductions based on the project municipality. Municipal rates vary significantly — Valencia offers IBI reductions for 5 years while Madrid offers 3 years. Proposal software with municipality-level IBI databases (500+ Spanish cities in SurgePV) ensures accurate local tax benefit calculations.

What is autoconsumo colectivo and how is it modeled in proposals?

Autoconsumo colectivo allows multiple consumers in a Spanish apartment building (comunidad de vecinos) to share energy from one rooftop PV installation under RD 244/2019. Proposal software must model multi-user energy allocation with reparto de energia coefficients and calculate individual ROI per dwelling unit. SurgePV can model collective self-consumption scenarios with per-household energy allocation and financial projections. Aurora Solar and OpenSolar have limited multi-dwelling capabilities. This is a growing segment in Spain as approximately 65% of Spaniards live in apartment buildings (comunidades de vecinos) where individual rooftop access is not possible.

Do Spanish solar proposals need to be in Spanish language?

Yes. Customer-facing proposals for Spanish homeowners and businesses should be in Spanish language with EUR pricing and Spanish financial terminology (autoconsumo, compensacion simplificada, IBI, ICIO, IRPF). SurgePV generates Spanish-language proposals with EUR financial modeling and Spanish regulatory terms. Aurora Solar is primarily English with limited Spanish support. OpenSolar offers Spanish language interface but lacks Spanish financial modeling (IBI/ICIO/IRPF calculators). For CNMC regulatory documentation and municipal permit applications, Spanish-language technical documentation is often required. SurgePV’s automated SLD generation produces technical diagrams with Spanish labeling.

Can proposal software handle Spanish PVPC tariff periods?

Yes. Accurate Spanish proposals must model PVPC (Precio Voluntario para el Pequeno Consumidor) 3-period tariff structure: punta (peak: 10h-14h, 18h-22h weekdays), llano (mid: 8h-10h, 14h-18h, 22h-24h weekdays), and valle (off-peak: 0h-8h all days plus weekends). This affects hourly self-consumption value and surplus compensation rates because solar production peaks during punta periods when electricity costs EUR 0.25-0.35/kWh, while weekend surplus is exported during valle periods when OMIE wholesale compensation is only EUR 0.05-0.07/kWh.

SurgePV models PVPC hourly pricing to optimize system sizing for maximum self-consumption during high-cost periods. Generic proposal tools using flat-rate electricity pricing will produce inaccurate ROI projections for Spanish customers on PVPC tariffs.