Solar panels on a rented villa in Spain: who pays, who saves, who owns them

A villa in Maresme with 12 panels on the roof looks like a gift until you read the electricity contract. Sometimes the tenant gets the savings. Sometimes the landlord keeps them, and the tenant pays rent on a house that pays for itself. The difference is paperwork, not sunshine.

Two installations, two very different deals

The first case is the landlord's system. The panels belong to the owner, the self-consumption contract is in the owner's name or the supply point is still theirs, and the tenant simply pays for whatever grid electricity arrives. In that setup the bill is lower than it would be without panels, but nobody has agreed how much of that saving belongs to you. If the rent was set with the panels in mind, you are paying twice.

The second case is a tenant who installs. That only makes sense on a long lease. A 5 kWp kit on a detached villa costs roughly €5,000–9,000 before any subsidy, and a battery adds €4,000–8,000. At current bills the payback is six to ten years. On a two-year rental it is a donation to the landlord.

What Spanish law actually requires

• A tenant cannot make fixed alterations without the landlord's written consent. Drilling anchors into a roof counts. A plug-in balcony kit is a different conversation.
• If the roof is a common element, the community of owners also has a say. Collective self-consumption has its own approval route, and a neighbour who dislikes the look can slow it down.
• Most small rooftop installations no longer need a prior administrative authorisation, but a town hall licence for the works often does apply, and coastal or historic-protection rules can say no.

Ask these questions before you sign anything

• Who owns the installation, and is there a financing or leasing contract attached to it? A 10-year panel lease can survive a change of tenant and even a change of owner.
• Is the supply contract in your name? If not, you cannot see the self-consumption arrangement, and you cannot claim the surplus compensation.
• Is surplus compensation active, and at what price? Retail electricity is roughly €0.20–0.28/kWh. Surplus is usually bought back at €0.05–0.10, so exporting is not the business case.
• Who maintains and insures the panels? Hail, theft and inverter failure are real, and the inverter is usually the first thing to go at year eight or ten.
• What happens when you leave? Removing a fixed installation is expensive. Either the lease says it stays and the rent reflects it, or it says the landlord buys it at a stated price.

The pool pump is the reason it works

A Maresme villa consumes most of its electricity in daylight hours: pool pump, air conditioning in July and August, the washing machine, the dishwasher, the immersion heater if there is one. That matches solar production well. A flat occupied by two people who leave at eight and come back at seven matches it badly, and without a battery almost everything generated is exported for small change.

So the first number to check is not the panel count. It is the contracted power (potencia contratada) and the last twelve months of bills, split into day and night. If the previous tenant used 350 kWh a month and most of it after dark, the panels are decoration.

If the landlord owns the system

A fair lease clause is short. It says the installation exists, who maintains it, who insures it, that the tenant pays only for imported electricity, and that the rent already reflects the panels or does not. What you want to avoid is a landlord who argues that the house is "energy independent" and then charges a premium for a system that still leaves a €90 monthly grid bill in January.

The "free panels" offer

Several companies install solar at no upfront cost and take the savings or a monthly fee for ten to fifteen years. That can be reasonable for an owner who intends to stay. For a tenant it is almost always wrong, because the contract is attached to the property and outlives your lease. If a landlord mentions a "free" installation, ask to see the contract and check whether it is registered against the finca. A charge on the property is not your problem while you rent, but it explains why the rent is what it is.

One more practical point: panels do not remove the need for a contract. Someone still pays the standing charge, the meter rental and the night consumption. A villa with solar and no battery is still a grid customer, usually a smaller one.