# Best Energy Providers in Spain (2026) > Top electricity and gas suppliers in Spain for 2026: Iberdrola, Endesa, Naturgy, and Repsol compared on network reach, product range, and green and dynamic tariff options. Updated: July 2026 · By Jules · URL: https://www.how-to-spain.com/energy/providers Updated July 2026. **[Iberdrola](https://www.iberdrola.es)** and **[Endesa](https://www.endesa.es)** are Spain's largest electricity suppliers, both with nationwide coverage and renewable-backed tariff options. **[Naturgy](https://www.naturgy.es)** is the traditional leader in gas supply and also sells electricity, and **[Repsol](https://www.repsol.es)** is a strong all-round challenger bundling electricity, gas, and fuel products. All four are comercializadoras regulated by the **[CNMC](https://www.cnmc.es)**, and all compete against the regulated **PVPC** tariff. Beyond the big four, other active national challengers include [EDP](https://www.edpenergia.es), [TotalEnergies](https://www.totalenergies.es), Repsol, [Octopus Energy](https://octopusenergy.es), and [Holaluz](https://www.holaluz.com), plus dozens of smaller comercializadoras; the CNMC publishes the full, current census of registered electricity suppliers at its official registry (source: CNMC, Listado de Comercializadoras de Electricidad, sede.cnmc.gob.es, as of July 2026). ## Top Energy Providers in Spain Ranked by network reach, product breadth, and how commonly each is recommended to newcomers setting up a home in Spain. Best for Green Tariffs ### Iberdrola 4.2Spain's largest electricity utility by generation capacity, with a strong focus on renewable energy and green tariff products sold nationwide. Why we recommend it: Largest electricity supplier in Spain with the broadest renewable generation portfolio and a strong green-tariff lineup. Best for: Households prioritizing renewable-backed electricity and nationwide coverage Pros - Largest electricity supplier in Spain by generation - Strong renewable and green-tariff product range - Nationwide coverage including islands Cons - Fixed-rate green tariff plans (Plan Online) priced around EUR 0.152-0.157/kWh, near the upper end of the big-four range as of 2026 - Gas product range narrower than Naturgy - Largest electricity supplier in Spain by generation - Strong renewable and green-tariff product range - Nationwide coverage including islands [Explore Iberdrola](https://www.iberdrola.es)Best All-Round Coverage ### Endesa 4.1One of Spain's largest electricity and gas suppliers, part of the Italian Enel group, offering combined and standalone electricity and gas contracts nationwide. Why we recommend it: Nationwide electricity and gas coverage backed by the international Enel group, with a broad tariff range. Best for: Households wanting one supplier for both electricity and gas backed by an international group Pros - Nationwide electricity and gas coverage - Backed by the international Enel group - Broad tariff range including bundled options Cons - Lost roughly 700,000 customers over the prior three years even while leading electricity sales, per CNMC market-supervision data as of Q2 2025 - Green tariff naming less prominent than Iberdrola - Nationwide electricity and gas coverage - Backed by the international Enel group - Broad tariff range including bundled options [Explore Endesa](https://www.endesa.com)Best for Gas ### Naturgy 4.0Spain's traditional gas market leader, historically the dominant national gas distributor, now also a major electricity supplier with combined tariff options. Why we recommend it: Traditional leader in gas supply in Spain, with a growing electricity and bundled-tariff business. Best for: Households where gas is the primary consideration, with electricity as a bundled add-on Pros - Traditional leader in Spanish gas supply - Growing electricity supply business - Combined electricity and gas billing Cons - Electricity sales market share of 8%, well below Endesa (28%) and Iberdrola (23%), per CNMC Q2 2025 data, though it remains the leading PVPC-segment supplier - Green electricity lineup less established - Traditional leader in Spanish gas supply - Growing electricity supply business - Combined electricity and gas billing [Explore Naturgy](https://www.naturgy.es)Best for Bundled Fuel Discounts ### Repsol 3.9A major Spanish energy group best known for fuel retail, also selling combined electricity and gas contracts with loyalty discounts at Repsol fuel stations. Why we recommend it: Strong all-round challenger with combined electricity, gas, and fuel-discount products under one account. Best for: Drivers and households who also want fuel-station discounts bundled with their energy account Pros - Combined electricity, gas, and fuel-discount products - Loyalty program tied to Repsol fuel stations - Growing challenger in the electricity and gas market Cons - A smaller, newer entrant to household electricity and gas than the traditional big three, though it added around 740,000 customers over the prior three years per CNMC data - Fewer green-tariff options than Iberdrola - Combined electricity, gas, and fuel-discount products - Loyalty program tied to Repsol fuel stations - Growing challenger in the electricity and gas market [Explore Repsol](https://www.repsol.es) ## How Do You Choose an Energy Provider in Spain? **Start by comparing the per-kWh energy price and standing charge separately from the regulated grid and levy components**, since only the energy portion differs between suppliers. If green sourcing matters, compare Iberdrola and Endesa's renewable-tariff certifications. If gas is your main need, Naturgy's traditional gas focus may offer a wider range of gas-specific options. Use the CNMC's official Comparador de Ofertas de Energia to check current offers before committing. Illustration of a lightbulb, a plug, and a home meter, for choosing an electricity and gas provider in Spain.Power, plug, and meter: energy in Spain. ## What Should Expats Know When Choosing a Supplier? Most expats prioritize a supplier that offers a straightforward **alta nueva** (new connection) or **cambio de titular** (change of contract holder) process, English-language customer service where available, and a clear combined electricity-and-gas bill. See the full [energy hub](/energy) for the complete market-structure breakdown, including the difference between your supplier and the regional distributor. ## How Much Does Energy Cost by Supplier? Energy pricing in Spain varies by supplier, tariff type, contracted power, and region, and has moved significantly with wholesale gas and electricity markets in recent years, so there is no single flat rate across providers. See [our price research page](/energy/providers-price-research) for illustrative per-kWh bands by supplier and tariff type. Illustration of a lightbulb, a plug, and a home meter, for choosing an electricity and gas provider in Spain.Power, plug, and meter: energy in Spain. ## Entity References Regulator: [CNMC](https://www.cnmc.es) (Comision Nacional de los Mercados y la Competencia). Grid operator (transmission): **[Red Electrica (REE)](https://www.ree.es)**. See our [user-review comparison](/energy/providers-comparison) for sentiment data on each provider listed above. ## Official Sources Supplier websites, [CNMC](https://www.cnmc.es). Updated: July 2026. Market-share rankings are sourced from the CNMC's quarterly retail electricity and gas market supervision report for Q2 2025, and green-tariff certification from the CNMC guarantees-of-origin registry, both as of July 2026. ## Related Guides [### Energy Providers: User Reviews Sentiment scores for every supplier above.](/energy/providers-comparison)[### Electricity & Gas in Spain The core setup and switching explainer.](/energy/electricity-gas) ## Frequently Asked Questions ### Which is the best overall energy provider in Spain? Iberdrola and Endesa are the two largest electricity suppliers in Spain, both offering nationwide coverage and green tariff options. By CNMC electricity sales market share for the second quarter of 2025, Endesa led with 28%, followed by Iberdrola with 23% and Naturgy with 8%, though Naturgy remains the dominant player in the separate regulated PVPC segment. Naturgy is the traditional leader in gas alongside a growing electricity business, and Repsol is a strong all-round challenger with combined electricity, gas, and fuel products, having added around 740,000 customers over the prior three years, more than any other major group (source: CNMC, quarterly retail electricity and gas market supervision report, Q2 2025, as of July 2026). The right pick depends on whether gas, green electricity, or bundled pricing matters most to you. ### Do these suppliers offer green electricity tariffs? Iberdrola markets itself heavily around renewable generation and green tariff options, and Endesa and Naturgy also sell renewable-backed tariffs. All Spanish green-electricity products must be backed by a Garantia de Origen (Guarantee of Origin) certificate issued under CNMC oversight, confirming the electricity sold was generated from renewable sources. Iberdrola's Energy Wallet lets customers pick the specific renewable plant, wind farm or hydro plant, their electricity is credited against, and Endesa, Naturgy, Repsol, TotalEnergies, and EDP all sell their own CNMC-certified 100% renewable tariffs (source: CNMC guarantees-of-origin registry and supplier product pages, as of July 2026). ### Can I get electricity and gas from the same supplier in Spain? Yes. Iberdrola, Endesa, Naturgy, and Repsol all sell combined electricity and gas contracts, often bundled onto a single monthly bill. Bundling with one supplier can simplify admin, but it is still worth comparing the combined price against separate best-in-class offers for each fuel using the CNMC's Comparador de Ofertas de Energia. --- Source: https://www.how-to-spain.com/energy/providers Last updated: Updated: July 2026 Format: LLM-readable Markdown twin (.md) of the canonical HTML page.