What we do

Our passionate and experienced people deliver successful clean energy projects globally.

Technologies

Driving a clean energy future through state-of-the-art renewable technologies.

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Resources

Browse our latest resources, including company updates, customer stories, industry insights, and research reports.

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Careers

Join a collaborative team of passionate individuals who engage in meaningful, stimulating, and world-changing work.

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About RES

We live our mission, celebrate the people making it happen and transform the way the world produces and consumes energy.

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Our offices

Like our business, we’re truly global – but proudly local. Find contact and location details for every RES office.

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Operations & Maintenance

HV Services

Our specialist HV service engineers provide a broad range of operation & maintenance, design, installation consultancy, testing and commissioning services for renewable energy projects.

Safety is our priority

We implement and operate our own safety rules which is supplemented by our in-house 24/7 control centre, ensuring statutory compliance and the highest levels of safety.

Our robust ISO certified H&S Management System ensures that we achieve market leading safety performance.

What we offer

Leveraging our decades of experience in the renewable industry, we deliver HV services across solar, energy storage, onshore wind and offshore wind, at voltages up to 400kV.

  • Transformer and switchgear installation and maintenance
  • Switching and isolations
  • Fault finding and repairs
  • SAP’s up to 400kV
  • Cable jointing, termination and testing
  • Oil sampling and analysis

  • Protection testing and commissioning (new and existing sites)
  • Partial discharge testing and reporting
  • Site rectification and defect works

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Get in touch

To find out more about our range of services and how RES can support you with High Voltage related services please get in touch via our contact form.

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Latest Resources

Learn more about our projects.

HV Services

A collaborative effort by RES’ Projects and High Voltage (HV) teams culminated in the successful re-energisation of a large solar farm for one of our clients. Decoy Solar is a 5.3MW solar farm located in Chichester, England. The site consists of over 26,000 panels and can provide sufficient low-cost renewable…

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David Coad #TeamRenewables

As a renewables specialist and High Voltage (HV) service provider we understand the importance of prioritising safety above all else, time management and minimising the downtime of assets.  In the UK&I, RES’ in-house HV unit builds on the existing experience of operating HV networks for both onshore and offshore assets…

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O&M Conference 2023

RenewableUK and ORE Catapult’s O&M Conference takes place on 13th September in Hull, UK&I. As headline sponsor of the event, our team will be on hand to answer any of your questions.

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Our technologies

Providing the transformation and innovation needed to deliver a clean energy future.

Wind

Delivering both onshore and offshore wind projects, carefully balancing safety, cost, risk, and opportunity to drive best-in-class results.

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Solar

Using our wealth of industry experience to build high performing utility scale solar farms.

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Energy Storage

Powering flexible ways to facilitate clean energy using our innovative energy storage solutions.

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Green hydrogen

Helping decarbonise industry by developing and operating green hydrogen plants fuelled by clean energy.

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Our technologies

Providing the transformation and innovation needed to deliver a clean energy future.

Wind

Delivering both onshore and offshore wind projects, carefully balancing safety, cost, risk, and opportunity to drive best-in-class results.

Learn more

Solar

Using our wealth of industry experience to build high performing utility scale solar farms.

Learn more

Energy Storage

Powering flexible ways to facilitate clean energy using our innovative energy storage solutions.

Learn more

Green hydrogen

Helping decarbonise industry by developing and operating green hydrogen plants fuelled by clean energy.

Learn more

Wind

Delivering both onshore and offshore wind projects, carefully balancing safety, cost, risk, and opportunity to drive best-in-class results.

Learn more

Solar

Using our wealth of industry experience to build high performing utility scale solar farms.

Learn more

Energy Storage

Powering flexible ways to facilitate clean energy using our innovative energy storage solutions.

Learn more

Green hydrogen

Helping decarbonise industry by developing and operating green hydrogen plants fuelled by clean energy.

Learn more

Contact us

Speak to a member of the team today

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