Company lists · Data refreshed September 2026
Top 24 Transmission line consulting firms based in London, United Kingdom
RevenueBase identified 66 transmission line consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 1,997 professional contacts across them, including 1,024 with verified work emails. Across the United Kingdom, London is the largest hub for this category.
This list covers transmission line consulting firms headquartered in London, United Kingdom, 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 29, 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 transmission line consulting firms based in London, United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,007 contacts → | ||||
Indirect evidence “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 583 contacts → | ||||
Indirect evidence “Aureos is a multi-disciplinary energy, transport networks specialist and engineering services provider, spanning the design, engineering, installation, maintenance, and crisis…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 62 contacts → | ||||
Indirect evidence “Chosen to deliver, trusted to care - for 30 years we’ve worked with clients across a diverse range of sectors to deliver safe and sustainable engineering solutions that prioritise…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 48 contacts → | ||||
Indirect evidence “VEDA Associates is an independent, multidisciplinary engineering consultancy driven by a passion for problem solving and technical excellence.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 27 contacts → | ||||
Indirect evidence “Navitas Engineering provides electrical engineering consultancy services to the railway and electricity supply industries.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 25 contacts → | ||||
Indirect evidence “M.P.E.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 23 contacts → | ||||
Indirect evidence “ELTRADE ELECTRICAL LTD is a civil engineering company” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 16 contacts → | ||||
Indirect evidence “UK Power Engineers (UKPE) is a professional services firm established in 2013, specializing in turnkey design, engineering, and consultancy solutions for the UK and international…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 14 contacts → | ||||
Partial evidence “PaE T&D is a Power Transmission and Distribution Design Consultancy” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 10 contacts → | ||||
Indirect evidence “In 2019, Hurley Palmer Flatt Group, the UK’s leading independent multidisciplinary engineering consultancy, joined global design firm HDR.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 10 contacts → | ||||
Indirect evidence “Utility Infrastructure Planning, Utility Project Management, Utility Design & Utility & Energy Procurement Specialists” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 9 contacts → | ||||
Indirect evidence “Established in 2013, Rail Power Solutions (RPS) has grown rapidly to become a well-recognised and leading provider of electrical designs for the railway industry.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 8 contacts → | ||||
Indirect evidence “LV and HV Electrical Consultancy and Engineering Services to Renewable Energy Markets and Industrial and Commercial Sectors” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 6 contacts → | ||||
Indirect evidence “Harrison How Limited are situated in the heart of London and have been serving clients since 1939.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 6 contacts → | ||||
Indirect evidence “On 6th December 2021, Collaborative Project Management Services (CPMS) was acquired by French construction engineering and mobility services group, Egis, and changed its name to…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 3 contacts → | ||||
Indirect evidence “OLAX Engineering is a company with global aspirations.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 2 contacts → | ||||
Indirect evidence “Power & Rail Solutions (PRS) is an innovative, progressive company that provide an extensive range of Consultancy, Design and Management services.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 2 contacts → | ||||
Partial evidence “Mechanical and Electrical Services Design Consulting Engineers.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 2 contacts → | ||||
Partial evidence “We are a consulting engineers company who provides specialised design, planning, and advisory services related to electrical systems in buildings, infrastructure, environmental…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 2 contacts → | ||||
Indirect evidence “Axonas is a UK-based specialist consultancy delivering advanced engineering and advisory solutions to clients worldwide.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 2 contacts → | ||||
Partial evidence “Harper Associates are consulting structural and civil engineers established in London, and we have conducted projects nationwide to bring our clients’ ideas to reality.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 1 contacts → | ||||
Partial evidence “ENR Consulting Engineers are a friendly, agile and dynamic group of experienced engineers with a keen eye for detail and efficient design.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 1 contacts → | ||||
Indirect evidence “A consultancy offering the services that will ensure utilities and engineering systems are conceived, designed, installed and commissioned for longevity and efficiency.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 1 contacts → | ||||
Indirect evidence “Orient Research Group aims to provide solutions across a wide spectrum of engineering needs.” Source: RevenueBase Database · checked Sep 29, 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: transmission line consulting firms. 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 transmission line consulting firms.
- Partial evidence
- Its own public description names part of transmission line consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name transmission line consulting firms. 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 66 transmission line consulting firms based in London, United Kingdom
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Transmission line consulting firms based in London, United Kingdom at a glance
As of Sep 29, 2026Companies by employee count
Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 66 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 transmission line consulting firms, 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 London, United Kingdom whose own description of what they do matches “transmission line consulting firms”. 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 transmission line consulting firms), 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 transmission line consulting firms, and records with no verified work email. Companies headquartered outside London 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, 1,024 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 29, 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 transmission line consulting firms, 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 transmission line consulting firms are there based in London, United Kingdom?
RevenueBase identified 66 transmission line consulting firms headquartered in London, United Kingdom 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?
Penspen, headquartered in London, tops this list with the largest team on record.
Which city in the United Kingdom has the most transmission line consulting firms?
London leads the United Kingdom with 66 headquartered companies, followed by Manchester (16) and Bristol (9).
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 1,024 verified decision-maker contacts tracked across these 66 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 29, 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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