Company lists · Data refreshed September 2026

Top 25 Cleantech startups based in Italy

Name: Cleantech startups based in Italy
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 812 companies tracked

RevenueBase identified 812 cleantech startups headquartered in Italy as of September 2026 and tracks 14,239 professional contacts across them, including 3,722 with verified work emails. Roma is the largest hub.

This list covers cleantech startups headquartered in Italy, 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 19, 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 19, 2026 86% judged on-target in blind review

812Companies

14,239Contacts tracked

3,722Verified emails

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The 25 largest cleantech startups based in Italy

Ranked by team size

Top 25 of 812 cleantech startups based in Italy, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to cleantech startups: 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	Enel Green Power	Indirect evidence	Roma, ItalyHQ checked Sep 19, 2026	5,001-10,000	5,251 contacts →
	Indirect evidence “We are the Enel Group company dedicated to the development and management of renewable energy generation worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
2	NWG S.P.A	Indirect evidence	Prato, ItalyHQ checked Sep 19, 2026	n/a	766 contacts →
	Indirect evidence “Nata a Prato nel 2003 è oggi una delle più importanti realtà nel mercato della Green Economy.” Source: RevenueBase Database · checked Sep 19, 2026
3	Dolomiti Energia	Indirect evidence	Rovereto, ItalyHQ checked Sep 19, 2026	1,001-5,000	369 contacts →
	Indirect evidence “Rinnovabili.” Source: RevenueBase Database · checked Sep 19, 2026
4	Renovit	Indirect evidence	Milano, ItalyHQ checked Sep 19, 2026	201-500	255 contacts →
	Indirect evidence “Renovit Società Benefit è un primario operatore nel mercato dell’efficienza energetica, nato da un'iniziativa di Snam e CDP Equity.” Source: RevenueBase Database · checked Sep 19, 2026
5	Geoside	Indirect evidence	Casalecchio Di Reno, ItalyHQ checked Sep 19, 2026	51-200	140 contacts →
	Indirect evidence “A national player in energy efficiency and sustainability: Geoside is the Energy Service Company (ESCo) of Italgas Group and a leader in Italy and Europe in the field of energy…” Source: RevenueBase Database · checked Sep 19, 2026
6	Siel S.P.A	Indirect evidence	Trezzano Rosa, ItalyHQ checked Sep 19, 2026	51-200	100 contacts →
	Indirect evidence “In its current structure, Siel Group is a holding company deeply rooted in a world-class economic, technological, and cultural context.” Source: RevenueBase Database · checked Sep 19, 2026
7	Robur S.P.A	Indirect evidence	Verdellino, ItalyHQ checked Sep 19, 2026	51-200	99 contacts →
	Indirect evidence “Founded in 1956, ROBUR designs, engineers and manufactures heating and cooling systems and solutions for residential, commercial, PA and industrial applications.” Source: RevenueBase Database · checked Sep 19, 2026
8	Italia GAS E Luce	Indirect evidence	Camaiore, ItalyHQ checked Sep 19, 2026	51-200	83 contacts →
	Indirect evidence “Advanced industrial knowledge and detailed research help us deliver renewable and cost-effective energy to tens of thousands of businesses and homes around the world.” Source: RevenueBase Database · checked Sep 19, 2026
9	Dolomiti Energia	Indirect evidence	Trento, ItalyHQ checked Sep 19, 2026	201-500	79 contacts →
	Indirect evidence “Siamo al tuo fianco per intraprendere un percorso di sostenibilità.” Source: RevenueBase Database · checked Sep 19, 2026
10	Lenergy SPA	Indirect evidence	Fornacette, ItalyHQ checked Sep 19, 2026	51-200	68 contacts →
	Indirect evidence “In Lenergy, acceleriamo la transizione verso l'indipendenza energetica per famiglie e imprese.” Source: RevenueBase Database · checked Sep 19, 2026
11	Unoenergy Green Solutions SPA	Indirect evidence	Cascina, ItalyHQ checked Sep 19, 2026	201-500	63 contacts →
	Indirect evidence “Unoenergy Green Solutions è una società del Gruppo Unoenergy che opera su tutto il territorio nazionale attraverso la vendita e l’installazione di sistemi per l’efficientamento…” Source: RevenueBase Database · checked Sep 19, 2026
12	Gesco SPA	Indirect evidence	Monteriggioni, ItalyHQ checked Sep 19, 2026	51-200	62 contacts →
	Indirect evidence “Entra nel mondo di Gesco SpA e scopri con noi come costruire un futuro sostenibile.” Source: RevenueBase Database · checked Sep 19, 2026
13	Energy Italy	Indirect evidence	Costermano Sul Garda, ItalyHQ checked Sep 19, 2026	11-50	59 contacts →
	Indirect evidence “Energy Italy SpA, azienda parte del gruppo Energy Holding, dal 2012 è tra le realtà più innovative nel settore delle energie rinnovabili e del risparmio energetico.” Source: RevenueBase Database · checked Sep 19, 2026
14	CNR Itae	Indirect evidence	Messina, ItalyHQ checked Sep 19, 2026	51-200	58 contacts →
	Indirect evidence “ITAE develops and promotes innovative energy technologies able to conjugate the deep knowledge on electrochemical, catalytic and adsorption processes with the ability to design…” Source: RevenueBase Database · checked Sep 19, 2026
15	EVA Energie Valsabbia	Indirect evidence	Gavardo, ItalyHQ checked Sep 19, 2026	51-200	57 contacts →
	Indirect evidence “EVA: il tuo partner per un futuro energetico sostenibile.” Source: RevenueBase Database · checked Sep 19, 2026
16	Inergia S.P.A	Indirect evidence	Rome, ItalyHQ checked Sep 19, 2026	11-50	53 contacts →
	Indirect evidence “Inergia was founded in 2003 with the strategic diversification of the Santarelli group, a leader in Italy’s real estate industry.” Source: RevenueBase Database · checked Sep 19, 2026
17	GIN Group	Indirect evidence	Milano, ItalyHQ checked Sep 19, 2026	n/a	47 contacts →
	Indirect evidence “La GIN GROUP è una società giovane e dinamica, creata da tre professionisti che hanno maturato la loro esperienza nel campo dell’energia alternativa attraverso l’importazione e la…” Source: RevenueBase Database · checked Sep 19, 2026
18	Gaia Energy Systems	Indirect evidence	Gricignano Di Aversa, ItalyHQ checked Sep 19, 2026	11-50	43 contacts →
	Indirect evidence “Gaia Energy Systems opera da anni nei settori delle energie rinnovabili e dell’efficientamento energetico, sia al fianco di aziende che di privati.” Source: RevenueBase Database · checked Sep 19, 2026
19	Greengo SRL	Indirect evidence	Bologna, ItalyHQ checked Sep 19, 2026	11-50	42 contacts →
	Indirect evidence “GreenGo originates, develops, finances, builds, and operates greenfield projects with cutting-edge solutions and state-of-the-art technologies.” Source: RevenueBase Database · checked Sep 19, 2026
20	Samso SPA	Indirect evidence	Milano, ItalyHQ checked Sep 19, 2026	11-50	42 contacts →
	Indirect evidence “OGNI GIORNO AIUTIAMO LE AZIENDE A DIVENTARE PIÙ EFFICIENTI, A RIDURRE I CONSUMI, A GENERARE AUTONOMAMENTE L’ENERGIA PULITA IN GRADO DI SODDISFARE IL PROPRIO FABBISOGNO.” Il nostro…” Source: RevenueBase Database · checked Sep 19, 2026
21	Eureka S.R.L	Indirect evidence	Trento, ItalyHQ checked Sep 19, 2026	51-200	41 contacts →
	Indirect evidence “Da oltre un decennio, ci impegniamo nel settore delle energie rinnovabili con una visione chiara incentrata sulla sostenibilità, l'efficienza energetica e la fornitura di servizi…” Source: RevenueBase Database · checked Sep 19, 2026
22	Esserenergia S.P.A	Indirect evidence	Pontedera, ItalyHQ checked Sep 19, 2026	11-50	40 contacts →
	Indirect evidence “Esserenergia S.p.A è un’azienda giovane e piena di entusiasmo che fa parte di un gruppo industriale solido e di successo.” Source: RevenueBase Database · checked Sep 19, 2026
23	VP Solar SRL	Indirect evidence	Montebelluna, ItalyHQ checked Sep 19, 2026	11-50	40 contacts →
	Indirect evidence “VP Solar company subject to management and coordination by Tadiran Group Ltd has been working in the field of renewable energy and energy saving since Led by innovation in R&D VP…” Source: RevenueBase Database · checked Sep 19, 2026
24	Aliseo Group SRL	Indirect evidence	Empoli, ItalyHQ checked Sep 19, 2026	11-50	39 contacts →
	Indirect evidence “WORK FOR MAXIMISING YOUR PERFORMANCE Thanks to technology and our values, we work to optimize the performance of facilities renewable energy.” Source: RevenueBase Database · checked Sep 19, 2026
25	Agenzia PER L'energia E LO Sviluppo Sostenibile	Indirect evidence	Modena, ItalyHQ checked Sep 19, 2026	11-50	38 contacts →
	Indirect evidence “La mission di AESS è fornire servizi a imprese, operatori economici e sociali, enti pubblici e di diritto privato e altre associazioni relativi a: – miglioramento dell’efficienza…” Source: RevenueBase Database · checked Sep 19, 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: cleantech startups. 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 cleantech startups.
Partial evidence: Its own public description names part of cleantech startups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cleantech startups. 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 812 cleantech startups based in Italy

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Cleantech startups based in Italy at a glance

As of Sep 19, 2026

26.1%Verified-email coverage

17.5Average contacts per company

1-10Median size (employees)

6.3%Largest-city concentration · Roma

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

445

11-50

287

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 Italy, so it is reported there. Company counts and contact totals on this page are exact for Italy, over 812 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 cleantech startups, 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 Italy whose own description of what they do matches “cleantech startups”. 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 cleantech startups), 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 cleantech startups, and records with no verified work email. Companies headquartered outside Italy 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, 3,722 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 19, 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.

Cleantech startups by metro

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 cleantech startups, 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 cleantech startups are there based in Italy?

RevenueBase identified 812 cleantech startups headquartered in Italy 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?

Enel Green Power, headquartered in Roma, tops this list with the largest team on record.

Which city has the most cleantech startups?

Roma leads with 51 headquartered companies, followed by Milan (41) and Milano (32).

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 3,722 verified decision-maker contacts tracked across these 812 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 19, 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.