Energy suppliers in Spain that AI assistants recommend
We asked ChatGPT, Claude and Gemini the four questions a buyer asks when looking for energy suppliers in Spain, three times each (Claude once), in Spanish, and counted who they named. These are the businesses named in two or more of the 28 answers.
Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.
- Answers
- 28
- Businesses named
- 17
- Named only once
- 3
- Named by 2+ assistants
- 11 of 14
- Named again on a rerun
- 74%
Edition October 2026. Download the data
Asked for energy suppliers in Spain, ChatGPT, Claude and Gemini most often named Naturgy (64% of answers), Holaluz (64%) and Octopus Energy (61%). Across 28 answers they named 17 different businesses, 3 of them only once. Each of four buyer questions was asked three times (Claude once), in Spanish, in October 2026.
The ranking
The AI Recommendation Rate is the fraction of the 28 answers that named a business. The range under it is a 95% confidence interval: where two ranges overlap, the gap between those businesses could be chance.
| # | Business | AI Recommendation Rate | ChatGPT | Claude | Gemini | Questions | Avg. position | With search |
|---|---|---|---|---|---|---|---|---|
| 1 | NaturgyIs this your business? | 95%: 46 to 79% | 33% | 50% | 100% | 4 of 4 | 2.4 | 0% |
| 2 | HolaluzAlso written HolaLuzIs this your business? | 95%: 46 to 79% | 33% | 100% | 83% | 4 of 4 | 4.1 | 0% |
| 3 | Octopus EnergyAlso written Octopus Energy EspañaIs this your business? | 95%: 42 to 76% | 92% | 100% | 17% | 4 of 4 | 1.6 | 50% |
| 4 | TotalEnergiesIs this your business? | 95%: 33 to 67% | 33% | 25% | 75% | 3 of 4 | 3.1 | 100% |
| 5 | EndesaIs this your business? | 95%: 27 to 61% | 8% | 0% | 92% | 4 of 4 | 3.1 | 50% |
| 6 | IberdrolaIs this your business? | 95%: 21 to 54% | 8% | 25% | 67% | 3 of 4 | 3.3 | 50% |
| 7 | Gana EnergíaIs this your business? | 95%: 18 to 51% | 17% | 0% | 58% | 3 of 4 | 3.7 | 0% |
| 8 | Som EnergiaIs this your business? | 95%: 15 to 47% | 25% | 50% | 25% | 2 of 4 | 2.3 | 0% |
| 9 | RepsolAlso written Repsol Luz y GasIs this your business? | 95%: 15 to 47% | 25% | 75% | 17% | 3 of 4 | 3.3 | 50% |
| 10 | LuceraIs this your business? | 95%: 6 to 32% | 17% | 25% | 8% | 2 of 4 | 3 | 0% |
| 11 | PodoIs this your business? | 95%: 4 to 27% | 0% | 75% | 0% | 3 of 4 | 3.7 | 0% |
| 12 | PepeenergyIs this your business? | 95%: 4 to 27% | 0% | 25% | 17% | 2 of 4 | 7 | 0% |
| 13 | Energía XXIIs this your business? | 95%: 2 to 23% | 0% | 0% | 17% | 2 of 4 | 4.5 | 0% |
| 14 | Factor EnergíaIs this your business? | 95%: 2 to 23% | 0% | 50% | 0% | 2 of 4 | 5 | 0% |
Each assistant column is the share of that assistant's own answers. Questions counts how many of the four produced the name at least once; position is where it came in the answer's list, 1 being first. 3 more names came up in a single answer and are counted above but not listed.
Is this your business?
Named on this list? Get the badge for your website and a free scan of who AI assistants recommend to your customers. Use the badge only for a business named here. It records this edition, without verifying ownership or promising future mentions.
What each assistant said
The same questions, the same number of times, and often different names. Each column is one assistant's top five from the ranking above, with the share of its own answers that named them.
| # | ChatGPT | Claude | Gemini |
|---|---|---|---|
| 1 | Octopus Energy92% | Holaluz100% | Naturgy100% |
| 2 | Naturgy33% | Octopus Energy100% | Endesa92% |
| 3 | Holaluz33% | Repsol75% | Holaluz83% |
| 4 | TotalEnergies33% | Podo75% | TotalEnergies75% |
| 5 | Som Energia25% | Naturgy50% | Iberdrola67% |
Named here? Put it on your site
Every business in the ranking was named in two or more answers. The badge says that and nothing more: no position, because the ranges above do not support one. It links back to this page, so anyone can check.
<a href="https://aigrow.gg/index/energy-suppliers/spain"><img src="https://aigrow.gg/badges/index/2026-10/energy-suppliers/spain.svg" width="312" height="100" alt="Named by AI assistants: Energy suppliers in Spain, AIGROW AI Visibility Index, October 2026"></a>The questions
Asked word for word, three times each (Claude once), to every assistant, in Spanish. The English under each is our translation. The prompt is the one the free scan uses. No web search, no location and no chat history, so every answer starts from the same place.
- 1¿Cuál es la mejor comercializadora de luz en España?What is the best electricity provider in Spain?
- 2Me voy a mudar a una casa nueva en España. ¿Qué compañía de luz y gas debería elegir?I am moving into a new home in Spain. Which electricity and gas company should I choose?
- 3¿Qué comercializadora de energía en España tiene las tarifas más baratas?Which energy company in Spain has the cheapest rates?
- 4¿Qué comercializadora de energía en España tiene la mejor tarifa de energía renovable?Which energy provider in Spain has the best renewable energy plan?
On this page the same questions were also asked with web search on, 2 answers. 71% of the businesses named with search were also named without it; the With search column above is each business's share of those answers.
How to read this page
- What it measures
- Which names these models produce when asked cold, from what they learned in training. It is not a review, a rating or our recommendation, and a business missing here may simply be one the models were never shown.
- Why the ranges matter
- 28 answers is a sample. Asked again next month, most shares will move by a few points; the ranges say how far they could move by chance alone.
- One business, several spellings
- Branches, legal suffixes and spellings of one business are merged, and the other spellings are printed under its name. Names that might be two businesses are kept apart.
- A name is wrong
- If a business here is closed, misnamed or yours and you want it removed, tell us. We correct or remove it when the page is next published.
AI Visibility Index
Elsewhere in the Index
Is your business on this list?
The free scan asks the same assistants the questions your customers ask, scores whether they name you, and lists who they name instead.
Edition October 2026 · published by Guglielmo Paesano, founder of AIGROW · data under CC BY 4.0