Company lists · Data refreshed September 2026

Top 25 Energy infrastructure contractors based in Spain

Name: Energy infrastructure contractors based in Spain
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 236 companies tracked

RevenueBase identified 236 energy infrastructure contractors headquartered in Spain as of September 2026 and tracks 21,480 professional contacts across them, including 3,118 with verified work emails. Madrid is the largest hub.

This list covers energy infrastructure contractors 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 September 16, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 16, 2026 86% judged on-target in blind review

236Companies

21,480Contacts tracked

3,118Verified emails

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The 25 largest energy infrastructure contractors based in Spain

Ranked by team size

Top 25 of 236 energy infrastructure contractors based in Spain, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to energy infrastructure contractors: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Tecnicas Reunidas	Partial evidence	Madrid, SpainHQ checked Sep 16, 2026	10001+	10,588 contacts →
	Partial evidence “TR is an international general contractor engaged in the engineering and construction of industrial facilities in the fields of-Oil & Gas -Refining & Petrochemical -Power…” Source: RevenueBase Database · checked Sep 16, 2026
2	Isolux Corsan	Strong evidence	Madrid, SpainHQ checked Sep 16, 2026	5,001-10,000	1,649 contacts →
	Strong evidence “Isolux is a global benchmark in energy, water and environmental, road and railways infrastructure with presence in more than 35 countries on four continents.” Source: RevenueBase Database · checked Sep 16, 2026
3	Dragados Offshore	Indirect evidence	11510 Puerto Real, SpainHQ checked Sep 16, 2026	1,001-5,000	1,348 contacts →
	Indirect evidence “Founded in 1972, Dragados Offshore S.A.” Source: RevenueBase Database · checked Sep 16, 2026
4	GES	Indirect evidence	Zamudio, SpainHQ checked Sep 16, 2026	501-1,000	702 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026
5	Insyte Instalaciones	Indirect evidence	Getafe, SpainHQ checked Sep 16, 2026	1,001-5,000	628 contacts →
	Indirect evidence “Insyte Instalaciones inicia su actividad en 1990 como empresa instaladora en el sector eléctrico y de telecomunicaciones.” Source: RevenueBase Database · checked Sep 16, 2026
6	Sampol	Partial evidence	Palma, SpainHQ checked Sep 16, 2026	1,001-5,000	581 contacts →
	Partial evidence “SAMPOL is an independent, multinational, family owned company founded in 1934 and a leader in the implementation of Energy projects, Electrical installations, Telecommunications…” Source: RevenueBase Database · checked Sep 16, 2026
7	Grupo Lantania	Partial evidence	Madrid, SpainHQ checked Sep 16, 2026	1,001-5,000	475 contacts →
	Partial evidence “En Lantania hacemos realidad grandes infraestructuras de transporte, agua y energía con el entusiasmo de una empresa joven y la solidez que nos aporta la experiencia.” Source: RevenueBase Database · checked Sep 16, 2026
8	Lanco Infratech Limited	Partial evidence	Madrid, SpainHQ checked Sep 16, 2026	1,001-5,000	314 contacts →
	Partial evidence “LANCO INFRATECH LIMITED is an oil and energy company based out of Calle Laguna del Marquesado Nª 19, Nave 16 Edificio Adriana 1ª Planta, Polígono Industrial La Resina…” Source: RevenueBase Database · checked Sep 16, 2026
9	Df-Duro Felguera	Indirect evidence	Gijón, SpainHQ checked Sep 16, 2026	1,001-5,000	301 contacts →
	Indirect evidence “Duro Felguera is a global company based in Asturias.” Source: RevenueBase Database · checked Sep 16, 2026
10	Técnicas Reunidas Initec	Indirect evidence	Madrid, SpainHQ checked Sep 16, 2026	501-1,000	276 contacts →
	Indirect evidence “Contratista general con actividad internacional que se dedica a la ingeniería, diseño y construcción de todo tipo de instalaciones industriales para un amplio espectro de clientes…” Source: RevenueBase Database · checked Sep 16, 2026
11	ACISA	Indirect evidence	Madrid, SpainHQ checked Sep 16, 2026	201-500	232 contacts →
	Indirect evidence “Elevate your expectations with ACISA, a proud member of the prestigious Aldesa Group, Spain's construction titan.” Source: RevenueBase Database · checked Sep 16, 2026
12	Quadrante Izharia	Indirect evidence	Las Rozas De Madrid, SpainHQ checked Sep 16, 2026	1,001-5,000	178 contacts →
	Indirect evidence “Nos dedicamos a la Ingeniería de Subestaciones y Lineas de AT y MT.” Source: RevenueBase Database · checked Sep 16, 2026
13	Initec Energía	Partial evidence	Madrid, SpainHQ checked Sep 16, 2026	201-500	168 contacts →
	Partial evidence “INITEC Energía focuses its activity on the construction of electricity generation facilities.” Source: RevenueBase Database · checked Sep 16, 2026
14	Syneox Rail	Strong evidence	Alcobendas, SpainHQ checked Sep 16, 2026	501-1,000	155 contacts →
	Strong evidence “Railway Energy Systems International Contractor” Source: RevenueBase Database · checked Sep 16, 2026
15	Voltae Engineering	Indirect evidence	Sevilla, SpainHQ checked Sep 16, 2026	51-200	132 contacts →
	Indirect evidence “Somos una compañía de ingeniería y consultoría altamente especializada, ofreciendo servicios integrales de alto valor en proyectos de transmisión, distribución y generación de…” Source: RevenueBase Database · checked Sep 16, 2026
16	Tecopsa	Partial evidence	Madrid, SpainHQ checked Sep 16, 2026	51-200	125 contacts →
	Partial evidence “Tecnología de la Construcción y Obras Públicas, S.A, tiene su origen en el sector de las energías renovables.” Source: RevenueBase Database · checked Sep 16, 2026
17	CEN Solutions	Partial evidence	Dos Hermanas, SpainHQ checked Sep 16, 2026	201-500	121 contacts →
	Partial evidence “CEN Solutions specializes in the design, development, and implementation of electrical equipment and turnkey solutions for the energy, petrochemical, industrial, aerospace, and…” Source: RevenueBase Database · checked Sep 16, 2026
18	Propav Infraestructuras	Partial evidence	Madrid, SpainHQ checked Sep 16, 2026	1,001-5,000	99 contacts →
	Partial evidence “Propav Infraestructuras (Propav) is an international company, specializing in the provision of multidisciplinary and sustainable services in the sector of infrastructure…” Source: RevenueBase Database · checked Sep 16, 2026
19	Diseprosa	Indirect evidence	Madrid, SpainHQ checked Sep 16, 2026	51-200	92 contacts →
	Indirect evidence “DISEÑOS Y PROYECTOS REUNIDOS, S.A.(DISEPROSA), fundada en Madrid en 1986 y dedicada al desarrollo y prestación de servicios de Ingeniería y Consultoría, Dirección y Supervisión de…” Source: RevenueBase Database · checked Sep 16, 2026
20	Emurtel	Indirect evidence	El Palmar (murcia), SpainHQ checked Sep 16, 2026	51-200	92 contacts →
	Indirect evidence “Emurtel es una compañía líder de ingeniería y consultoría multidisciplinar orientada a la gestión integral de proyectos, ofreciendo soluciones de valor añadido en el diseño…” Source: RevenueBase Database · checked Sep 16, 2026
21	Comaple	Indirect evidence	Villafranca Del Castillo, SpainHQ checked Sep 16, 2026	51-200	64 contacts →
	Indirect evidence “Empresa líder en el sector de suministro de material eléctrico, instrumentación y comunicaciones para proyectos industriales e infraestructuras.” Source: RevenueBase Database · checked Sep 16, 2026
22	Seselec España	Indirect evidence	Madrid, SpainHQ checked Sep 16, 2026	51-200	61 contacts →
	Indirect evidence “SESELEC es una empresa EPC especializada en infraestructura eléctrica (Subestaciones, Líneas de Transmisión, Plantas Fotovoltaicas) dentro de México, Latinoamérica y España.” Source: RevenueBase Database · checked Sep 16, 2026
23	Ineltron Solutions	Indirect evidence	Betanzos, SpainHQ checked Sep 16, 2026	201-500	58 contacts →
	Indirect evidence “INELTRON es una empresa multinacional especializada en la prestación de servicios de ingeniería, construcción, puesta en marcha, operación y mantenimiento en sistemas de…” Source: RevenueBase Database · checked Sep 16, 2026
24	Design And Projects International, C.A. Dapin	Partial evidence	San Sebastián De Los Reyes, SpainHQ checked Sep 16, 2026	201-500	58 contacts →
	Partial evidence “Design and Projects International, C.A.(DAPIN, C.A.), is a thriving engineering and construction company in the Oil & Gas / Energy industry positioned in natural gas, refining…” Source: RevenueBase Database · checked Sep 16, 2026
25	Grupo Cartago Ingenieros	Indirect evidence	Madrid, SpainHQ checked Sep 16, 2026	51-200	56 contacts →
	Indirect evidence “Grupo CARTAGO desarrolla servicios de ingeniería y de dirección y supervisión de obra en la construcción y puesta en marcha de plantas industriales, petroquímicas, centrales…” Source: RevenueBase Database · checked Sep 16, 2026

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: energy infrastructure contractors. 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 energy infrastructure contractors.
Partial evidence: Its own public description names part of energy infrastructure contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy infrastructure contractors. 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 25 of 236 energy infrastructure contractors based in Spain

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Energy infrastructure contractors based in Spain at a glance

As of Sep 16, 2026

14.5%Verified-email coverage

91.0Average contacts per company

11-50Median size (employees)

16.9%Largest-city concentration · Madrid

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for Spain, so it is reported there. Company counts and contact totals on this page are exact for Spain, over 236 companies.

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 energy infrastructure contractors, 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 “energy infrastructure contractors”. 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 energy infrastructure contractors), 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 energy infrastructure contractors, 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, 3,118 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 September 16, 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.

Energy infrastructure contractors by metro

Energy infrastructure contractors in Madrid40

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 energy infrastructure contractors, 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 energy infrastructure contractors are there based in Spain?

RevenueBase identified 236 energy infrastructure contractors headquartered in Spain as of September 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?

Tecnicas Reunidas, headquartered in Madrid, tops this list with the largest team on record.

Which city has the most energy infrastructure contractors?

Madrid leads with 40 headquartered companies, followed by Barcelona (10) and Sevilla (7).

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 3,118 verified decision-maker contacts tracked across these 236 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 16, 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.