Solar compensation in Spain: compare the whole bill, not just the export rate.

Solar electricity is normally most valuable when it replaces electricity the home would otherwise buy. Surplus sent to the grid can still have value, but the advertised compensation rate is not enough to judge an offer. A fair comparison brings import charges, export credit and fixed costs into one annual estimate.

What “simplified compensation” means

Royal Decree 244/2019 established administrative, technical and economic conditions for electricity self-consumption in Spain. Under the simplified compensation route, the value of eligible surplus exported during a billing period is used in the economic balance on the supply bill. This is commonly called compensación simplificada de excedentes.

It is not the same as selling unlimited electricity as an independent generator. The decree sets conditions for participation, and the economic balance is applied within the bill. Households outside the simplified route can face different market, representation, registration and tax arrangements. Confirm the installation’s category with the installer, distribution company and supplier.

Why the import tariff still matters most

A home may self-consume solar at midday, import electricity in the evening and export the remaining daytime surplus. Self-consumed electricity avoids the applicable retail import cost for that unit. Exported electricity earns or receives the contractual compensation. Because the import price is often different from the compensation value, increasing useful self-consumption can be more valuable than maximising exports.

That does not mean a battery is automatically economic. A battery adds equipment cost and loses some energy during charging and discharging. Its value depends on usable capacity, efficiency, cycle life, warranties, the household’s demand profile and the gap between import and export prices.

Check eligibility and registration first

The installation needs the correct technical and administrative treatment. Depending on its location, size, configuration and connection, this can involve an electrical certificate, regional self-consumption registration, distribution-company processing, an access and connection procedure or an exemption from part of that procedure. Collective self-consumption requires additional agreements and allocation information.

Do not judge a supplier by the advertised solar rate until the supplier confirms that the supply point and installation are ready for compensation. Ask what documents are outstanding, who submits them and when the first compensated bill is expected. Keep registration receipts and the installer’s handover documents.

Compare these seven contract points

1. Import energy price. Compare every time period and any price-review formula.
2. Export compensation. Is it fixed, variable or linked to a published market reference?
3. Credit limit. Ask how the supplier applies the billing-period economic balance and what happens to surplus value beyond it.
4. Contracted power cost. Solar generation does not remove the fixed capacity charge.
5. Virtual-battery terms. If offered, check whether it is a financial credit, whether it expires and whether monthly fees apply.
6. Contract duration. Record renewal, price-change and exit conditions for both import and export.
7. Required extras. Add maintenance, insurance, equipment rental or service fees to the annual comparison.

Model a full year, not one sunny month

Solar output and household demand change with season, orientation, shading, weather and occupancy. Air conditioning can raise daytime self-consumption in summer; electric heating can raise winter imports. Use at least a reasonable annual estimate of generation, direct self-consumption, export and import. Treat installer projections as estimates and ask what losses and degradation they include.

For an existing system, smart-meter and inverter history is better than a generic yield estimate. Align the periods carefully: inverter production, household consumption, grid import and grid export measure different things. Production minus export is not always a perfect self-consumption figure if the measurements cover different intervals.

Questions for a like-for-like solar tariff comparison

Question	Why it changes value
What is the annual import estimate?	Sets the main energy cost that export credits reduce.
How many kWh will be exported?	Headline compensation matters only for eligible measured surplus.
Is compensation fixed or indexed?	An indexed value can rise or fall after contracting.
Can credits carry forward?	Only a contract’s specific virtual-credit terms answer this.
Are there monthly service fees?	A fee can outweigh a slightly higher compensation rate.

Be precise about “feed-in tariff”

The phrase is used loosely online. In Spain, many household offers are commercial surplus-compensation arrangements under the self-consumption framework, not a classic guaranteed feed-in tariff paid for every exported kWh without reference to the bill. Rayte labels the route as solar export or compensation and links to the supplier’s terms so the visitor can see the actual mechanism.

After changing supplier

Check that the new contract identifies the self-consumption arrangement and compensation method. Review the first complete bill after activation: the meter period, imported energy, exported energy, rate applied and credit. A delay in administrative processing can mean compensation does not appear immediately. Keep dated copies of the contract, registration evidence, meter data and correspondence for any complaint.

Official sources used

• BOE — Royal Decree 244/2019 on electricity self-consumption
• IDAE — five steps to becoming a self-consumer
• CNMC energy-offer comparator

Administrative processes and commercial offers can change. Sources were reviewed on 31 July 2026; confirm the current position for the installation and autonomous community.