Whether solar is worth it for your business comes down to three things: how much power you use while the sun is up, the tariff you pay and what the system costs. Sunshine is rarely the deciding factor – a restaurant that trades late has a very different case to an office that empties at six.
What Decides Whether Solar Is Worth It for a Spanish Business?
Whether solar is worth it for a Spanish business is decided by three factors: the share of electricity used during daylight, the electricity tariff and the installed system cost. Daytime self-consumption moves the return most, because exported power earns far less than power used on site.
What decides it is daytime load alignment, not roof size and not sunshine hours. Spain has the sunshine; that is not the variable separating a strong case from a weak one. A bakery, an office or a warehouse running Monday to Friday under the generation curve consumes its own output directly. A late-night bar exports most of what it makes for very little back. Size the system around consumption, not around the roof.
| The three variables | What it means for your return |
| Daytime consumption share | How much of your generation you use on site instead of exporting it cheaply |
| Electricity tariff | The price per kWh you avoid every time you self-consume |
| System cost | The capital you recover through those avoided bills |
What is self-consumption, and why does it decide your return?
Self-consumption (autoconsumo) is the solar electricity a site uses the moment it is generated, rather than exporting it. It decides the return because a self-consumed unit avoids the full import price, while an exported unit earns only a partial credit under Spanish surplus rules.
This is why two identical systems on two identical roofs can return very differently:
- The business that consumes as it generates captures the full value of every unit.
- The one that generates into an empty building exports the surplus for far less.
Savings, payback, whether you need a battery: it all comes back to this percentage.
Do Spanish businesses pay a different electricity rate to households?
Spanish businesses and households pay on different electricity tariff structures. Households use the 2.0TD tariff, up to 15 kW. Businesses over 15 kW use the 3.0TD tariff, or the high-voltage 6.1TD group, with six time-of-use periods and mandatory free-market pricing above 10 kW.
Two more lines land on a commercial bill that a household never sees:
- One is a charge for reactive energy, drawn by motors, compressors and air conditioning.
- The other is a penalty for exceeding your contracted power in any period.
A domestic savings estimate accounts for neither. That is why you cannot read a commercial saving off a household rule of thumb.
Can a solar system cover a three-phase supply?
A solar system covers a three-phase supply through three-phase inverters, which balance generation across all three phases of the connection. Most commercial premises larger than a small shop run three-phase, and three-phase inverters are standard for these installations in Spain.
We confirm the intake, the phase balance and your contracted power on site. That is part of why a commercial quote is engineered, not read off a price list.
How Much Does a Commercial Solar System Cost in Spain?
A commercial solar system in Spain costs roughly €9,000 to €25,000 installed, for systems of 6 to 25 kWp, PV only and IVA included. Cost per kWp falls as the system grows, from about €1,499 at 6 kWp to €991 at 25 kWp, because part of every installation is fixed regardless of size.
| System size | Likely installed cost | Mid-point | € per kWp |
| 6.0 kWp (10 panels) | €7,200 – €10,800 | €9,000 | €1,499 |
| 9.0 kWp (15 panels) | €9,200 – €13,800 | €11,500 | €1,276 |
| 12.0 kWp (20 panels) | €11,200 – €16,800 | €14,000 | €1,165 |
| 15.0 kWp (25 panels) | €13,200 – €19,800 | €16,500 | €1,099 |
| 18.0 kWp (30 panels) | €15,200 – €22,800 | €19,000 | €1,054 |
| 21.0 kWp (35 panels) | €17,200 – €25,800 | €21,500 | €1,022 |
| 25.2 kWp (42 panels) | €20,000 – €30,000 | €25,000 | €991 |
Installed cost by system size. PV only, no battery, IVA included. Panels are 600W. These figures are what a system of this size costs. A commercial installation adds roughly €326 for the higher legalisation fee, plus site-specific costs the model cannot capture.
The spread on each row is about ±20%, and it is deliberate; a price in a blog post gets quoted back to us for years. The band reflects the real gap between one roof and the next.
Look again at that €/kWp column: it drops 34% across the range.
Here’s why: roughly €4,000 of any installation is fixed: delivery, legalisation, commissioning and admin. Only about €499 per panel scales with size. So the fixed block spreads thinner across a bigger system, and doubling the system does not double the price. Most buyers I quote assume the opposite.
You can see what you’re actually paying for in a solar quote broken down line by line.
This table stops at 25.2 kWp because that is where our measured cost data ends, not where our systems do. We install commercial systems well beyond it, up to around 400 kW. Above the table’s range, every project is quoted individually. Three-phase connection, industrial mounting, roof access and grid studies vary too much between sites to publish a figure that means anything.
What pushes a commercial system’s price up or down?
A commercial system’s price is driven up or down by five main factors beyond the panels: three-phase connection, mounting type, roof access, grid studies and structural reinforcement. Mounting and access typically move the figure more than the modules, which are a minority of the total cost.
The five, in the order they usually bite:
- Three-phase connection
- Industrial or ballasted mounting
- Difficult roof access, and the scaffolding it needs
- Grid studies, once you pass certain power thresholds
- Structural reinforcement, on older or lightweight roofs
The panels are a minority of the bill. What changes the number is the building.
Does a business need a battery, and what does it add to the cost?
Whether a business needs a battery depends on when it consumes electricity: daytime operations often need none, while evening-trading businesses use storage to shift generation into trading hours.
A commercial battery adds roughly €2,600 to €16,000 depending on capacity.
| Battery capacity | Mid-point | Realistic range |
| 5 kWh | €2,640 | €1,300 – €3,980 |
| 10 kWh | €5,280 | €2,600 – €7,960 |
| 15 kWh | €7,920 | €3,900 – €11,940 |
| 20 kWh | €10,560 | €5,200 – €15,920 |
| 30 kWh | €15,840 | €7,800 – €23,880 |
Indicative battery pricing, added on top of the PV system.
A battery also widens the estimate on the whole project, from ±20% to ±40%, because prices vary threefold across brands. Treat these as indicative, not settled.
How Much Can a Business Save with Solar in Spain?
A business in Spain can save several thousand euros a year with solar, depending on how much generation it uses on site. A 25 kW restaurant installation in Mijas cut its annual bill from €7,640 to €1,629, a saving of about €6,011. Savings scale with self-consumption.
To show how a projection is built, we model roughly 1,653 kWh per kWp per year in Málaga. You can sense-check any installer’s yield claim against the EU’s own site-specific solar yield calculator. Multiply that generation by your self-consumption share and your tariff, and you have the savings. That’s the whole calculation.
A rental villa in Marbella saves over €4,380 a year on the same arithmetic.
You can see both in context: a 25 kW restaurant system in Mijas and a rental villa in Nueva Andalucía.
How much of what you generate will you actually use?
A business’s self-consumption percentage is the share of generation it uses on site. It typically runs from around a third to most of the output, depending on operating hours. At the Mijas restaurant, a battery raised it from 36% to 62%.
Filling the roof is not the goal. A system sized past what you can use in daylight just exports more surplus at a low price. The right size is the one that maximises what you use yourself.
What happens to surplus generation?
Surplus generation in Spain is credited against the energy term of the next bill, under the simplified compensation mechanism (compensación de excedentes) for installations up to 100 kW. The credit cannot be sold for cash, nor exceed the value of energy consumed that month.
This is the most misunderstood point in commercial solar. It’s where UK-style “sell your power back to the grid” advice goes wrong for Spain, whose rules are set by Royal Decree 244/2019. The grid does not pay you for export. It credits the value against what you import. That is also why some businesses use a “virtual battery” instead of a physical one. It banks your surplus value as credit to draw down later. Self-consumption, not export, is where the return lives.
What Is the Payback Period for Commercial Solar in Spain?
The payback period for commercial solar in Spain is typically four to five years for a business that consumes well during daylight. It is calculated as net system cost divided by annual saving, and shortens most when a high share of generation is self-consumed.
An installer who asserts “four to five years” and one who can show the working are not offering the same thing. Two things move the number: the cost and the saving. Change either, and the payback moves with it.
How is solar payback actually calculated?
Solar payback is calculated as net installed cost divided by annual electricity saving. For a business, net cost is the ex-IVA price reduced by accelerated amortisation, since the IVA is reclaimable. A discounted payback also accounts for electricity prices rising over the system’s life.
| Payback input | For a business |
| Net system cost | Ex-IVA (you reclaim the IVA), reduced further by accelerated amortisation |
| Annual saving | Self-consumed kWh × tariff avoided, plus surplus compensation |
| Simple payback | Net cost ÷ annual saving |
| Discounted payback | The same, adjusted for rising electricity prices over the system’s life |
What shortens or lengthens it?
Payback shortens with high daytime self-consumption, a high tariff, reclaimed IVA and accelerated amortisation. It lengthens with evening-weighted demand, a low tariff, or an oversized system exporting surplus cheaply. A mid-life inverter replacement adds a cost that clean payback figures omit.
The levers that pull payback shorter:
- High daytime self-consumption
- A high electricity tariff
- The IVA reclaimed and amortisation applied
- Municipal IBI or ICIO relief
The one caveat worth pricing in early: an inverter usually needs replacing once over a system’s 25 to 30 year life. A clean payback figure leaves that out. None of it makes solar a poor investment. A four-to-five-year payback on a 25-year asset is strong. The honest payback figure is the one that counts the whole picture, replacement included.
What Tax Relief and Grants Can a Spanish Business Claim?
A Spanish business can claim several tax reliefs on solar: recovery of the IVA on the installation, accelerated amortisation (libertad de amortización) against corporation tax, and optional municipal bonificaciones on IBI (up to 50%) and ICIO (up to 95%). National grants are largely closed; regional schemes vary.
The corporate write-off runs through Impuesto sobre Sociedades under the accelerated-amortisation provision extended for 2026. This is the business route, not the residential IRPF deduction you will see in most consumer guides.
IBI and ICIO relief is municipal. It exists only where your town hall has adopted it. The percentage, the duration, even whether commercial premises qualify: all of it varies locally, and Málaga’s scheme, for one, is scoped to residential-use property.
On grants, no national subsidy is open to new applicants right now. Regional programmes such as those from the Junta de Andalucía open and close on their own budgets, so check the live position before you count on one.
Which Businesses Get the Best Return from Solar in Spain?
The best returns from solar in Spain go to businesses whose demand falls during daylight: offices, retail units, warehouses and daytime workshops, which self-consume most of what they generate. Restaurants, bars and holiday rentals return well only with a battery to shift generation into evening trade.
| Business type | When it uses electricity | Battery needed? | What drives the return |
| Restaurants & bars | Mostly evening trade | Yes | Storage shifts midday generation into evening hours |
| Hotels & accommodation | Steady through the day, all season | Sometimes | Air-con, hot water and laundry draw across generation hours |
| Holiday rentals | Peaks in the costliest months | Yes | Pool plant and guest demand peak with summer prices |
| Offices & retail | Under the generation curve | Usually no | Trading hours sit directly beneath midday output |
| Industrial & warehousing | Steady weekday daytime | Usually no | Large roof plus steady daytime load, so high self-consumption |
Sources: the restaurant and holiday-rental rows come from jobs we have completed: the Mijas restaurant (about €6,011 a year saved) and the Nueva Andalucía rental (over €4,380). The hotel, office/ retail and industrial rows come from proposals we have created for businesses in Spain and for ongoing installation projects.
For a system engineered around your own consumption rather than a category, our commercial solar installation service starts from twelve months of your actual usage.
Why does a bigger business save a smaller share of its bill?
A bigger business saves a smaller share of its bill because its constraint inverts. A small premises is limited by how much midday generation it can use on site. A large consumer uses nearly all it generates, but cannot fit enough panels on its roof to match total demand.
A large hotel or factory can install the biggest system its roof allows and still cover only part of its consumption. Not because the system underperforms. Because its demand is larger than any rooftop array can meet. Solar still pays at that scale. It just will not clear the bill.
When Are Solar Panels Not Worth It for a Business in Spain?
Solar is not worth it for a business in Spain in three cases: when it consumes mostly after dark, when it leases on a term shorter than the payback period and when its roof is too small to offset a very large bill. Each is a mismatch between generation and demand, not a fault in the technology.
A business that knows when solar does not pay can weigh the case for when it does.
What if your business consumes mostly after dark?
For a business that consumes mostly after dark, such as a late bar or a night-shift operation, solar’s advantage largely disappears, because it generates while the premises is quiet. A battery can store daytime output for evening use, but rarely justifies its cost for overwhelmingly nocturnal demand.
If most of your load lands after dark, I will tell you that at the survey rather than sell you a system that cannot pay for itself.
What if you lease your premises?
Where a business leases its premises, solar may not be worth it, because the system is a fixed asset requiring landlord consent and a payback within the remaining lease. A business four years into a five-year lease cannot recover a four-to-five-year payback before it leaves.
Ownership, or a long lease with the landlord’s agreement, is effectively a precondition. Close to the end of a lease, solar is a conversation for your next premises, not this one.
Get a Free Commercial Solar Survey
Want the figures for your own premises? The examples here come from real buildings. But your roof, your consumption and your electrical intake are yours alone, and all three change the answer.
A commercial survey puts a qualified survey engineer on your site. We take twelve months of your consumption, scan the roof by drone, and model the system in Pylon. You get two costed options within 48 hours, a projected payback, and an itemised quote you can hold us to. It’s free, with no obligation to proceed.
