Company lists · Data refreshed August 2026
Top 24 Clean energy venture capital companies based in Spain
RevenueBase identified 56 clean energy venture capital companies headquartered in Spain as of August 2026 and tracks 1,699 professional contacts across them, including 283 with verified work emails and 80 with mobile numbers. Madrid is the largest hub.
This list covers clean energy venture capital companies headquartered in Spain, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed August 31, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 24 largest clean energy venture capital companies based in Spain
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 499 contacts → | ||||
Strong evidence “Atlas Renewable Energy delivers clean energy at scale.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 2 | 466 contacts → | ||||
Partial evidence “X-ELIO: global leader in the development of renewable energy projects.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 3 | 146 contacts → | ||||
Partial evidence “Matrix Renewables is a global renewable energy platform created and backed by global alternative asset manager TPG and its $31 billion impact-investing platform.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 4 | 94 contacts → | ||||
Indirect evidence “We are a Swiss-based investment company.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 5 | 33 contacts → | ||||
Partial evidence “INGENIUM GROUP is an international energy group specialized in the development and investment in renewable energy projects, with a presence in Italy, Spain, and Germany.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 6 | 32 contacts → | ||||
Partial evidence “is a company focused on becoming a benchmark in energy generation and the provision of services to guarantee the sustainability of the planet.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 7 | 23 contacts → | ||||
Partial evidence “iGU Energy nace con la vocación de contribuir en la transición energética global y promover una economía descarbonizada.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 8 | 18 contacts → | ||||
Partial evidence “Altano Energy is an institutional renewables platform, lead by a strong executive team with a combined experience over 150 years in the infrastructure and energy sectors and…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 9 | 17 contacts → | ||||
Partial evidence “Uriel Renovables, S.A.(URSA) es una compañía dedicada a la promoción, construcción y explotación de proyectos de energías renovables.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 10 | 16 contacts → | ||||
Partial evidence “Integralia Energía desarrolla proyectos energéticos de calidad, eficientes y rentables, con la máxima profesionalidad.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 11 | 14 contacts → | ||||
Partial evidence “Energía Aljaval is a Spanish developer and investor in renewable energies, focusing on photovoltaic, wind and biomass.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 12 | 11 contacts → | ||||
Partial evidence “Alter5 is an investment platform that caters to institutional investors in the renewable energy sector, focusing on utility-scale solar and wind projects, as well as…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 13 | 6 contacts → | ||||
Strong evidence “Frontier Renewables is a global investment management firm focused on investing in renewable energy infrastructure projects to help accelerate the world’s clean energy transition.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 14 | 5 contacts → | ||||
Indirect evidence “At HydroH2, we believe that the greatest challenges of our time create the most significant opportunities.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 15 | 5 contacts → | ||||
Strong evidence “Sociedad gestora de entidades de inversión en el sector de las renovables, transferencia tecnológica y Venture Capital.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 16 | 4 contacts → | ||||
Strong evidence “Investing and accelerating energy projects to boost energy transition A Corporate Venture Capital that invests and accelerates startups, projects and disruptive technologies to…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 17 | 4 contacts → | ||||
Partial evidence “Desarrollamos proyectos globales de energías renovables y comunicaciones, creando alianzas con actores estratégicos en los países donde operamos.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 18 | 4 contacts → | ||||
Partial evidence “Supporting the energy transition towards a future powered by sustainable energy” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 19 | 3 contacts → | ||||
Partial evidence “SENERGY HOLDING GROUP es un grupo inversor español presente en diversos sectores como energía, agricultura e industria que, con el esfuerzo de un gran equipo de profesionales, ha…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 20 | 3 contacts → | ||||
Partial evidence “Green Tie Capital® was constituted in 2019 by a group of experts in various fields (legal, tax, technical, financial) related to the investment and divestment, management, and…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 21 | 3 contacts → | ||||
Partial evidence “Renewable Development - Investment - Advisory Sectors - Renewable Energy and Sustainable Development - Tech Startups” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 22 | 3 contacts → | ||||
Strong evidence “Qonsius Capital is a Madrid-based strategic advisory and venture building firm focused on the cleantech sector.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 23 | 2 contacts → | ||||
Strong evidence “Alium Technologies is a clean energy project development company founded in 2018 by a team of professionals with more than twenty years of experience in the renewable and energy…” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
| 24 | 1 contacts → | ||||
Indirect evidence “We invest into sustainable projects.” Source: RevenueBase Database · checked Aug 31, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: clean energy venture capital companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names clean energy venture capital companies.
- Partial evidence
- Its own public description names part of clean energy venture capital companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name clean energy venture capital companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 24 of 56 clean energy venture capital companies based in Spain
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Clean energy venture capital companies based in Spain at a glance
As of Aug 31, 2026Companies by employee count
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among clean energy venture capital companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Spain whose own description of what they do matches “clean energy venture capital companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names clean energy venture capital companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among clean energy venture capital companies, and records with no verified work email. Companies headquartered outside Spain are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 283 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on August 31, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names clean energy venture capital companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many clean energy venture capital companies are there based in Spain?
RevenueBase identified 56 clean energy venture capital companies headquartered in Spain as of August 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Atlas Renewable Energy, headquartered in Madrid, tops this list with the largest team on record.
Which city has the most clean energy venture capital companies?
Madrid leads with 23 headquartered companies, followed by Sevilla (7) and Barcelona (4).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 283 verified decision-maker contacts tracked across these 56 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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