Spain Electricity Tariff API

How a household electricity price is built in Spain

Spain liberalized retail in 2009 and nearly a thousand suppliers compete, though a state-regulated default tariff sold at cost still covers a meaningful share of homes. Distribution is dominated by five large network groups, but unlike most countries the grid charge is not set locally: the national regulator fixes one uniform network price per tariff class for the whole country. The signature feature is a three-band time-of-use structure covering almost every home, in which network and system charges run far higher during the daytime peak than overnight.

What a household bill is made of

1. 1

   Energy

   Day-ahead marginal pricing on the shared Iberian market, now cleared in quarter-hour periods. The regulated default tariff passes the market price through hourly with no commercial margin, though since 2023 it is no longer pure spot — the hourly production cost blends spot with monthly, quarterly and annual forward references. Free-market offers come as fixed rates, usually with the same three time bands, or as indexed products tracking the market plus a stated margin.

2. 2

   Network charges (peajes)

   Set by the national regulator, uniform per access-tariff class and never per operator. The mass-market low-voltage class has three energy periods but only two power periods, so a household is billed both on kWh by band and on contracted kilowatts by band. On working days the day splits into an overnight valley, mid-morning and evening shoulder blocks and two daytime peak blocks; weekends and national holidays are valley all day.

3. 3

   Taxes and levies

   System charges, set by the ministry with the same national-per-class structure, fund renewable and cogeneration support, historic tariff-deficit annuities and the extra cost of generation in the non-peninsular territories; capacity-mechanism financing is priced at the generator busbar and grossed up by losses before it reaches the meter. The electricity excise, the Impuesto Especial sobre la Electricidad under Ley 38/1992, is a *percentage*, not a per-kWh amount, applied to energy plus network and system charges plus the power term, with a statutory floor per MWh. Municipal right-of-way levies and the efficiency-fund contribution are charged to the supplier and reach the consumer inside the retail margin rather than as bill lines.

4. 4

   VAT

   21% standard, applied last, on top of the excise. The Canary Islands and the North African cities levy their own indirect taxes instead, at materially lower rates for domestic supply. Both the excise and the VAT rate on electricity have been temporarily cut and restored several times, sometimes with a statutory trigger tied to the electricity inflation figure.

Regulation shaping the price

• CNMC sets the network tariffs and the ministry sets the system charges, both annually and both national — which means the whole non-energy stack for a household is a single arithmetic sum with no local variation.
• The regulated default tariff is available only to natural persons and microenterprises below a contracted-power threshold, sold with zero margin by a small set of designated reference suppliers, and published hourly for the next day.
• A social tariff gives vulnerable consumers a substantial discount, and severely vulnerable consumers a larger one, applied to every term of the regulated tariff up to an annual consumption cap.
• There is no feed-in tariff. Residential export runs through simplified surplus compensation: surplus is credited in money on the same bill each month, and the credit may never exceed the value of the energy drawn in that billing period — the bill floors at zero with no carry-over.

Market structure last reviewed August 2026.