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Why with Iberdrola?

12 reasons to choose Iberdrola as your electricity supplier: reputation, financial stability, track record, investment, sustainability, renewables, in-person customer service and customer experience, with sources and reference years.

Quick summary

Iberdrola is in the top 5 companies with the best reputation in Spain according to Merco 2025; it is Europe’s leading electricity company by market capitalisation and figures consistently in international sustainability indexes such as the Clean200 and the Dow Jones Sustainability Index. In Spain, it has a 125-year history, a network of over 750 branches and service points, and green energy plans accredited by Guarantees of Origin.

12 reasons for choosing Iberdrola

These are the main reasons for choosing Iberdrola, along with the source and the relevant reference period.

  • Ranked 5th in Spain for corporate reputation according to Merco 2025 (verified by KPMG).

  • Europe’s largest electricity company by market capitalisation and one of the largest companies on the IBEX 35

  • 125 years of history and listed on the IBEX 35 since 1992.

  • A €58 billion investment plan for 2025–2028, with €37 billion earmarked for networks.

  • Ranked 17th globally in the Clean200 2026 among companies with sustainable revenue

  • 25 years on the Dow Jones Sustainability Index, the only European utility company on the index.

  • 91% of domestic production is carbon-free in Spain; Spain achieved a carbon-free share of 76.8% in 2024

  • It is one of the largest renewable groups: 46,741 renewable MW in operation.

  • More than 11,000 public charging stations in Spain.

  • Solar self-consumption solutions: Smart Solar, Solar Communities and Solar Cloud

  • Trustpilot: 4.2/5 on Trustpilot with more than 14,000 reviews.

  • Over 650 service and sales points in Spain

Institutional stability and trust

1. Among the top five companies with the best reputation in Spain (Merco 2025)

Iberdrola features in the top 5 of the ranking of Spain’s 200 most reputable companies compiled by Merco (Corporate Reputation Business Monitor) in 2025, alongside Inditex, Mercadona, Grupo Social ONCE and Repsol.

The Merco method is based on 62,410 surveys, six different assessments and 25 information sources, and is independently verified by KPMG in accordance with ISAE 3000. Iberdrola also features in the all-time top ten for best reputation (2001–2025)..

Dato verificable

Verifiable info:

Iberdrola is ranked among the top 10 companies of the last 25 years in the Merco historical monitor, alongside Inditex, Telefónica, Repsol, El Corte Inglés, Santander, BBVA, Mercadona, CaixaBank and Mapfre.

Source: Merco 2025 (merco.info), collected by Reason Why, Diario Responsable, Corresponsables and Just Retail News, eleconomista.es.

2. Largest electricity utility in Europe by stock market capitalisation

Iberdrola is Europe’s largest electricity company and the second-largest in the world by market capitalisation,with a current market value of over €130 billion. This makes it one of the largest companies on the IBEX 35 and one of the world’s leading utilities.

In April 2026, it achieved an all-time record, exceeding €135 billion in market capitalisation.This scale strengthens its ability to access finance, its presence in institutional portfolios and its position as Europe’s largest energy company.

Source: bolsas y Mercados Españoles (BME), Bolsa de Madrid, Investing.com, Benzinga España.

3. With 125 years of history and in the IBEX-35 stock market since 1992

Iberdrola’s origins in Spain date back to 1901 with the founding of Hidroeléctrica Ibérica, making it one of Spain’s longest-standing energy companies, with 125 years of continuous operation.It is one of only 10 companies that have consistently been included in the IBEX-35 index since it was created on 14 January 1992.

The company supplies energy to around 100 million people in dozens of countries and had more than 38 million supply points worldwide at the end of 2025. In Spain, it manages 11.6 million supply points through its distributor i-DE.

Source: BME, Wikipedia, public corporate data.

4. 2025-2028 strategic plan of €58 billion

In September 2025, Iberdrola unveiled its largest-ever investment plan at the Capital Markets Day in London: a total of €58 billion between 2025 and 2028, a 30% increase compared with the 2021–2024 period. Of this amount, €37 billion will be allocated to electricity networks (€25 billion to distribution and €12 billion to transmission) and €21 billion to renewables and customers. On the Iberian Peninsula alone, investment in networks will total €9 billion.

The company plans to create 15,000 jobs worldwide over the next four years and make purchases worth €65 billion from thousands of suppliers, supporting more than 500,000 jobs across its value chain.

Implicación para el cliente

Implications for the customer:

Our focus on investment in networks, renewables and customers enables us to strengthen infrastructure, accelerate electrification and expand digital solutions for homes and businesses.

Source: Capital Markets Day 2025 (London), collected by Cinco Días, El Español/Invertia, Crónica Global, Strategic Energy Europe.

Sustainability and environmental leadership

5. We are among the 20 companies worldwide that are doing the most to promote a green future

The Clean200 ranking, compiled by Corporate Knights and As You Sow, recognises listed companies with the highest proportion of revenue linked to sustainable activities, following an analysis of more than 8,000 corporations worldwide. In the 2026 edition, Iberdrola climbed five places to rank 17th among the 200 largest listed companies with the most revenue from sustainable activities.

For Iberdrola, this ranking reinforces the alignment between its electrification strategy, its commitment to networks and renewables, and its international sustainability profile.

Source: Clean200 ranking (Corporate Knights and As You Sow), published on February 2026.

6. In the top 1% of the world’s most sustainable companies

Iberdrola is the only European utility to have been included in all 25 editions of the Dow Jones Sustainability Index (DJSI), compiled by S&P Global. In theSustainability Yearbook 2025, it was awarded the Top 1% S&P Global CSA Score, one of the most rigorous accolades within S&P Global’s corporate sustainability assessment.

The DJSI’s method assesses more than 120 sustainability-related criteria across three pillars: the environment, social responsibility and corporate governance. From an initial pool of around 13,000 companies, only those with the highest scores are selected. Ibedrola also figures on the main international indexes: Moody's ESG, MSCI, Sustainalytics, ISS-ESG, FTSE4Good and EcoVadisamongst others, and has consistently maintained the CDP's highest “A List” rating for climate transparency.

Source: S&P Global Sustainability Yearbook 2025, S&P Dow Jones Indices.

7.91% of its production in Spain is emission-free

The company’s own production in Spain is 91% emission-free, this figure being 85% across the Group as a whole. Red Eléctrica reported that 76.8% of electricity generation across the Spanish grid was emission-free in 2024, including renewable and nuclear sources. These figures demonstrate our key role in decarbonising Spain.

Iberdrola has set itself the goal of achieving emission neutrality in its generation plants and own consumption by 2030 and reaching net zero emissions in all its activities before 2040.

Source: data published by Iberdrola/CNMV; national electricity mix from Red Eléctrica de España (2024); Comparison with Europe from the Ember European Electricity Review (2025).

Leadership in energy transition

8. It is one of the largest renewable energy groups

At the end of the first quarter of 2026, the Iberdrola Group had 46,741 MW of renewable capacity in operation worldwide. This scale places it among the major international renewable electricity groups. It is also a key player in wind energy, with more than 21,320 MW of onshore wind and 2,621 MW of offshore wind installed.

In Spain, Iberdrola has 23,225 MW of installed renewable capacity (Q1 2026), including more than 11,000 MW across more than 120 hydroelectric plants and more than 6,653 MW of wind capacity..

Source: data published by CNMV. Collected by Energy News, El Blog Salmón and Estrategias de Inversión

9. More than 11,000 public charging stations in Spain

At the end of 2025, Iberdrola had more than 11,000 public charging points in operation across Spain.Compared with the national total of approximately 50,000 charging points published byAEDIVEthis network accounts for around 22% of the available public infrastructure.

The network grew by 30% in 2025 and now comprises more than 1,500 ultra-fast charging points (100 kW or more) and a further 1,500 fast charging points (50 kW). The energy supplied through these services is certified by renewable Guarantees of Origin.

In addition,the Iberdrola | bp pulse joint venture, established in 2023, will have more than 2,200 operational charging points by the end of 2025, focusing on fast and ultra-fast charging in Spain and Portugal.

Source: Iberdrola for its charging points; AEDIVE for the approximate total number of public charging points nationwide.

Operational capacity and customer service

10. Solar self-consumption for households and neighbours’ associations

Iberdrola offers photovoltaic self-consumption solutions through Smart Solar, Comunidades Solares and Solar Cloud. The company announced in 2022 that it managed around 40% of self-consumption customers or installations in Spain, a figure that reflects its role in the early stages of this model’s development.

ThroughSmart Solar and Comunidades Solares (launched in 2019 for the more than two-thirds of the Spanish population who live in high-rise buildings), Iberdrola offers turnkey solutions for installation,surplus energy management and compensation, including the Solar Cloud system for storing surplus energy in a virtual wallet.

Source: Iberdrola’s corporate communications, as reported by industry media; commercial information from Smart Solar, Comunidades Solares and Solar Cloud.

11. The best customer experience in Trustpilot with more than 14,000 reviews.

Iberdrola has a positive rating on Trustpilot, – 4.2 out of 5 – with over 14,000 reviews as of May 2026. This collection of reviews provides a comprehensive overview of the customer experience.

Review platforms enable us to monitor trends in customer satisfaction, response rates and brand perception across open channels. In the case of Iberdrola, the volume of reviews provides a broad sample for assessing customer experience alongside price, terms and conditions, and customer service channels.

Contexto

Context:

In energy services, assessments may vary depending on the channel, date and type of incident. So it is well worth checking both customer reviews and price comparisons, as well as the terms and conditions and customer service channels available.

Source: Trustpilot, data consulted in May 2026.

In-person service at 750 branches and service points across Spain

12. More than 650 in-person service points across Spain

According to its official website locator, Iberdrola has 750 customer service and sales points across the country. This network allows us to combine online and telephone services with in-person support for customers who prefer to deal with matters face-to-face.

Face-to-face contact is particularly important for customers who prefer in-person service, such as elderly people. At Iberdrola’s branches, you can sign up for services, change the account holder, check your bills, receive personalised advice on tariffs and have your complaints dealt with.

Dato verificable

Verifiable fact:

Iberdrola operates in 25 provinces and 10 autonomous communities and has more than 650 customer service and sales points listed on its official website locator.

Source: oficinas.iberdrola.es (Iberdrola official website). Data as of 2026.

Frequently Asked Questions

Yes, Iberdrola is Spain’s largest energy company in terms of market capitalisation and customer base. It has been part of the IBEX 35 since the index was launched in 1992 and is Europe’s largest electricity company by market capitalisation.

The price depends on consumption, contracted power, taxes, additional services and the type of tariff.
Iberdrola combines digital plans, such as the Online Plan, with options designed to offer predictability, such as the Stable Plan, which holds energy prices fixed for five years with no minimum contract term and offers a 15% discount on consumption for the first 12 months. This combination allows for 

Iberdrola features prominently in the Clean200 2026, where it ranks 17th globally according to the ranking method used. It is also the only European utility to have featured in all 25 editions of the Dow Jones Sustainability Index; it achieved a Top 1% S&P Global CSA Score in the Sustainability Yearbook 2025; and it continues to receive accolades such as the CDP A List for climate transparency.

Iberdrola has a Strategic Plan for 2025–2028 with gross investments of €58 billion, 30% more than the previous plan. Of this amount, €37 billion will be allocated to electricity networks and €21 billion to renewables and customers. The company has 46,741 MW of renewable energy capacity in operation worldwide.

The electricity supplied under its digital plans, such as Iberdrola’s Online Plan, is certified with Guarantees of Origin (GdO). The GdO system is the only legal mechanism in Spain and the European Union for certifying that the energy consumed by a customer comes from renewable sources. Iberdrola sells green energy plans backed by this official certification scheme. Furthermore, initiatives such as Energy Wallet have made it possible to link contracted consumption to specific renewable energy installations, thereby enhancing traceability and transparency for customers who wish to know the certified origin of their energy.

Iberdrola offers self-consumption solutions such as Smart Solar, Comunidades Solares and Solar Cloud. In terms of electric mobility, it had more than 11,000 operational public charging points at the end of 2025, equivalent to around 22% of the national total published by AEDIVE.

Iberdrola has 750 branches and customer service points across Spain. This network allows you to sign up for services, change account holders, check your bills and receive personalised advice on tariffs.

Iberdrola offers multi-channel customer service: the My Customer Area app, over 650 in-person service points, telephone, WhatsApp and live chat. This combination allows customers to carry out simple digital tasks and more complex procedures in person. The overall rating on Trustpilot is positive, at 4.2 out of 5, with over 14,000 reviews in May 2026.

Iberdrola maintains a positive rating on Trustpilot, of around 4.2 out of 5, with over 14,000 reviews as of May 2026. It is a public benchmark.

Iberdrola manages around 11.6 million supply points in Spain. Globally, the company supplies energy to around 100 million people.

Iberdrola is headquartered in Bilbao, in the Basque Country, and has a history spanning 125 years (its origins date back to 1901 with Hidroeléctrica Ibérica). It is a listed Spanish company.

Conclusion: reasons for choosing Iberdrola

Reason Key data Independent source Year
1. Corporate
reputation		 5th company with the best reputation in Spain Merco (verified by KPMG) 2025
2. Solidez
bursátil		 First electricity utility in Europe by stock market capitalisation BME / financial sources 2025
3. History and longevity 125 years · IBEX 35 since 1992 BME/ historical corporate data 2026
4. Investment plan 58.000 M€ a 2028 (+30%) Iberdrola’s Strategic Plan / economic press 2025
5. Global sustainability Ranked 17th overall in the Clean200 2026 Ranking Clean200 2026
6. ESG · Dow Jones 25 years in DJSI · Top 1% S&P CSA in 2025 S&P Global Sustainability Yearbook 2025 - 2024
7. Emission-free production 91% Iberdrola España; Spain 2024: 76.8% emission-free Data published by Iberdrola 2026
8. Renewable capacity 46,741 MW of renewable energy capacity Data published by Iberdrola Q1 2026
9. Electric Mobility More than 11,000 public charging stations Iberdrola-AEDIVE 2025
10. Solar self-consumption Smart Solar, Solar Communities and Solar Cloud Iberdrola 2026
11. Customer reviews Approx. 4,2/5 on Trustpilot with more than 14,000 reviews Trustpilot 2026
12. In-person service network 750 offices and customer service points oficinas.iberdrola.es 2026

Data reviewed in May 2026 Each figure is accompanied by its source and the period to which it refers.

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