Best Electricity Tariffs After Solar

Sources checked on 12 September 2026. This comparison of contract conditions is not a price ranking or supplier recommendation. Obtain the current offer and its particular conditions.

For a second home, compare credit you can actually spend, not just credit accumulated during empty months. Before switching, ask in writing what happens to the remaining balance. Your offer’s conditions may differ from the linked public documents.

Gather 12 months of imported and exported kWh from your distributor, your contracted power in each period, and the complete written terms of each offer. For time-of-use or indexed pricing, use the relevant hourly or period data. An annual average rate can hide expensive hours.

For each billing period, calculate import charges, subtract usable export credit, then add power charges, fees, services, meter rent and applicable taxes. Model each month separately before adding the year: standard compensation does not act like unlimited annual net metering.

Illustrative comparison, not live supplier prices. For 300 imported kWh and 200 exported kWh in one month:

• Offer A: EUR 0.20/kWh import and EUR 0.05/kWh export. EUR 60 minus EUR 10 = EUR 50 energy subtotal.
• Offer B: EUR 0.24/kWh import and EUR 0.10/kWh export. EUR 72 minus EUR 20 = EUR 52 energy subtotal.

With identical other charges, A is EUR 2 cheaper despite paying half as much for exports. These subtotals exclude fixed charges and taxes. Neither example reaches the compensation cap. In an export-heavy month the outcome can reverse, so do not multiply one summer result by twelve.

Read the export compensation and virtual-battery guide before assigning a value to unused credits.

The Spanish electricity market features hundreds of commercial suppliers (comercializadoras), each offering distinct tariffs for solar customers. The optimal tariff for your property depends entirely on your consumption profile.

A home with very low imports may be sensitive to fixed charges, whereas a villa with evening cooling may be sensitive to import prices. Neither pattern proves a virtual battery or a particular tariff will be cheaper: calculate the complete bill.

Two very different kinds of battery

Stored electricity is not the same as bill credit.

Physical battery

Electricity · kWh

Stores energy at your property for later use.

• Equipment and installation costs
• Capacity, power limits and losses
• Backup only with a compatible, correctly configured system

Virtual battery

Bill credit · EUR

A supplier account records financial credit under a commercial agreement.

• Check service fees and eligible bill charges
• Check expiry, transfer and cancellation rules
• No stored electricity and no blackout backup

Concept illustration. Physical storage provides blackout backup only with compatible equipment and a correctly designed isolation arrangement.

When evaluating solar energy contracts, you must analyze the complete pricing structure:

• Import Price (P1, P2, P3): The price you pay for energy drawn from the grid. Time-of-use tariffs have different rates for peak (punta), flat (llano), and off-peak (valle) hours.
• Export Compensation Rate: The rate paid for surplus solar energy fed back into the grid.
• Virtual Battery Option: Whether the supplier allows surplus credits to accumulate to offset fixed charges or apply to a second property.
• Fixed Daily Power Fee (Potencia): The cost per kW of contracted power capacity. This represents a significant portion of Spanish electricity bills.

Illustrative bill layout, not a customer bill or a current supplier offer.

Unless your property is completely off-grid with massive battery storage, you will continue to import electricity. Most residential solar production occurs between 10:00 and 16:00, whereas peak household usage often occurs in the evenings (lighting, cooking, entertainment) and overnight (air conditioning, heating, pool filtration).

Choosing a tariff with a slightly higher export rate but a penalizing import rate is a common mistake. A low import rate is critical for keeping bills low during the winter and cloudy periods.

Contracted power represents the maximum electrical capacity your home can draw from the grid simultaneously before the main breaker trips. In Spain, you are billed a fixed daily rate per kW of contracted capacity.

Installing solar does not establish a safe capacity reduction. Check peak demand in both power periods, winter evenings, battery reserve and discharge limits, and operation with an empty battery. Request a demand-based assessment before changing capacity; savings depend on the actual contract and change charges.