Grosvenor Power

What Grosvenor Power does

Grosvenor Power Services Ltd is a UK-based, privately-held specialist contractor providing installation, maintenance, and asset management services for high-voltage power infrastructure rated 33kV to 400kV. Founded in 1982 and headquartered in Culcheth, Warrington, the company operates through two divisions: Grosvenor Power (substation and transformer services) and Grosvenor Oil Services (insulating oil supply, conditioning, regeneration, laboratory testing, and waste management). The company serves UK utility and grid operators including National Grid, UK Power Networks, and Scottish & Southern Energy, with a project portfolio spanning Air Insulated Switchgear (AIS), Gas Insulated Switchgear (GIS), power and distribution transformers, HVDC DC converter substations, and onshore/offshore renewable grid connections.

The company's technical capabilities are anchored in long-tenured field crews with principal contractor capability, supported by proprietary mobile High Vacuum Degassing units, a custom-built trailer-mounted Transformer Oil Regeneration System (TORS), and a permitted waste management facility in Carrington that enables reclamation of used transformer oil to BS 148:2009. Through a partnership with Transoil Laboratory, the company offers Dissolved Gas Analysis and broader condition-monitoring testing. It is the only direct UK distributor of Nynas naphthenic transformer oils (Nytro Libra, Gemini X, Taurus, Lyra X, 10XN), and holds ISO 9001, ISO 14001, and Achilles UVDB certifications.

Grosvenor Power generates revenue primarily through project-based professional services contracts plus managed oil services delivered directly to enterprise utility and renewable developer clients. Pricing is quote-based and not publicly disclosed, reflecting the bespoke nature of substation installation, transformer refurbishment, HVDC converter station delivery, and offshore wind grid connection work. Distribution is exclusively UK-domestic, with services delivered via mobile field teams and at dedicated facilities, and oil products supplied via bulk tanker or 1,000-litre IBC containers. The business is privately held without disclosed institutional investors or external funding.

Name

Grosvenor Power

Legal name

Grosvenor Power Services Ltd

Website

https://grosvenorpower.co.uk

Company type

Private

Founded year

1982

Operating status

Operating

Headcount range

1–10 employees

Short description

Grosvenor Power Services Ltd is a UK-based specialist contractor founded in 1982 that installs and maintains 33kV to 400kV power infrastructure for utility operators and renewable energy developers. It delivers substation, transformer, HVDC converter station, and offshore wind grid connection services alongside an integrated insulating oil supply, regeneration, and waste management business.

Ownership category

akta.pro rank

Product category

Power Infrastructure Services

NAICS

Electric Power Transmission, Control, and Distribution (22112), Electric Power Distribution (221122)

SIC

Electric Services (4911)

akta.pro primary industry

Power Transformers, Reactors & Auxiliary Power Systems (EUADACAJ)

akta.pro secondary industries

Grid Interconnection & Collector Substation EPC (Utility-Scale Renewables) (EUAEABAK), Commissioning, Testing & Energization Services (Pre-Commissioning, Grid Code Compliance) (EUAMAFAK)

Keywords

• Power infrastructure installation
• Transformer maintenance services
• Electrical substation services
• Transformer oil supply
• HVDC converter installation

Headquarters

HQ city

Culcheth, Warrington

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Power Infrastructure Installation Services: Installation, repair, upgrade, testing and asset management of power and distribution transformers, AIS, GIS substations, DC converter substations, and renewable energy grid connections from 33kV to 400kV. Delivered both on-site and at dedicated Transformer Facility.
2. Electrical Insulating Oil Supply: Supply of new unused electrical insulating oil to BS EN 60296 (2012) and reclaimed electrical insulating oil to BS 148 (2009). Delivered via bulk tanker or through pack sizes up to 1,000 litre IBC containers.
3. Oil Conditioning and Regeneration Services: Mobile oil conditioning and regeneration services using High Vacuum Degassing units for on-site filtration and the TORS system for full oil reclamation to British Standards.
4. Waste Oil Management: Complete waste management service including consignment, transportation, temporary storage, and full reclamation to BS 148:2009 from permitted facility in Carrington. Helps customers comply with Waste Hierarchy regulations.
5. Laboratory Testing Services: Comprehensive condition monitoring including Dissolved Gas Analysis, acidity, electric strength, water content, colour, sediment, fibres, resistivity tests, and contamination analysis for PCBs, particles, phenols, furanic compounds, and corrosive sulphur.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels2 records

Core offering

Grosvenor Power provides specialist installation, maintenance, and asset management services for electrical power infrastructure in the UK, covering voltages from 33kV to 400kV, including AIS and GIS substations, transformers, and DC converter substations. The company operates two divisions: Grosvenor Power Services, which delivers power infrastructure construction and transformer lifecycle services, and Grosvenor Oil Services, which supplies, conditions, tests, and manages transformer oil. The business serves UK utility operators, distribution network operators, and renewable energy developers.

Product overview

Grosvenor Power Services is an independent company providing comprehensive power infrastructure installation and maintenance services from 33kV to 400kV, with over 40 years of experience since 1982. The company's core offerings center on two divisions: Grosvenor Power (electrical infrastructure) and Grosvenor Oil Services (transformer oil management). Grosvenor Power provides installation services for AIS (Air Insulated Switchgear), GIS (Gas Insulated Switchgear), Transformers (with sub-services for installation/relocation, repair/refurbishment, uprating/retrofits, testing, and asset management), DC Converter Substations for HVDC applications, and Renewables integration for onshore/offshore wind connections. Grosvenor Oil Services complements the power division with a complete transformer maintenance package including supply of electrical insulating oils (Nynas products), electrical oil conditioning and regeneration using mobile HVD units and TORS systems, laboratory testing services with dissolved gas analysis, and waste oil management. The Transformer sub-services and Oil Services function together to provide full lifecycle support for power transformers and HV oil-filled equipment.

Differentiator

Problem solved

Functional benefit

Products and services

• Power Infrastructure Installation Turnkey installation of 33kV to 400kV electrical power infrastructure including Air-Insulated Switchgear (AIS) and Gas-Insulated Switchgear (GIS) substations, transformer installations, and DC converter substations for utility companies, distribution network operators, transmission owners, and renewable energy developers.
• Transformer Lifecycle Services Comprehensive transformer services including installation, repair, uprating, refurbishment, testing, and asset management for power transformer assets, offered to utility operators and asset owners across the UK.
• Transformer Oil Supply Supply of electrical insulating oils for transformers, leveraging the company's position as sole UK distributor of Nynas transformer oils, providing bulk supply to utility and industrial customers.
• Oil Conditioning and On-Site Treatment Mobile oil conditioning and treatment services delivered via on-site processing units, including reclamation, degassing, and reconditioning of transformer oils to extend asset life.
• Transformer Oil Laboratory Testing

Named customers4 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered core.

• Transoil LaboratorycoreTechnology or IntegrationPartnership with Transoil Laboratory for comprehensive condition monitoring services including Dissolved Gas Analysis for early transformer fault detection. Laboratory is ISO9001 and Achilles UVDB verified.
• NynascoreChannel Partner/ Reseller/ DistributorOnly direct distributor of packaged Nynas naphthenic based transformer oils in the UK. Supplies Nytro Libra, Gemini X, Taurus, Lyra X and 10XN grades from the Nynas Nova family.
• Leading HVDC Equipment ManufacturerscoreStrategic or Co-development PartnerPartnership with leading manufacturer of HVDC equipment for installation of DC converter stations. Grosvenor's trained workforce has experience in installing DC converter stations with proven installation service capability.
• World Leading Generation, Transmission & Distribution CompaniescoreStrategic or Co-development PartnerLong-standing partnerships with world leading generation, transmission and distribution companies built over 40+ years for installation and maintenance of AIS, GIS, offshore wind connections and Converter Substations.

Scale indicators4 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Siemens Energy: Global OEM for power transformers, GIS and HVDC technology with a substantial UK presence. Comparable as both a supplier of equipment Grosvenor installs and a competitor for end-customer EPC scopes.
• Hitachi Energy: Global leader in transformers, HVDC and grid integration that manufactures and supplies many of the high-voltage substations and converter stations on which Grosvenor performs installation services. Directly comparable as a transformer and HVDC market participant and a likely counterparty on UK projects.
• GE Vernova: Global grid solutions business covering transformers, HVDC and substations. Operates in the same product categories as Grosvenor's installation and maintenance services and shares the same utility customer base.
• Balfour Beatty: Major UK infrastructure group with a Power Transmission & Distribution business delivering substations and overhead lines for UK utilities. Directly comparable as a UK substation/grid contractor serving the same National Grid and DNO customer base.
• Schneider Electric: Global electrical equipment manufacturer active in distribution transformers, switchgear and grid solutions. Comparable as a broader portfolio incumbent whose products overlap the transformer, switchgear and oil-immersed equipment markets where Grosvenor operates.

Direct peers

• NG Bailey: UK-based electrical and mechanical services contractor with a dedicated power infrastructure division serving utilities and renewable developers. Closest UK-headquartered peer in business model and customer profile to Grosvenor Power.
• Kier Group: UK infrastructure and utilities services contractor with exposure to power, water and telecoms networks. Comparable as a UK infrastructure services firm engaging with similar DNOs and utility clients in non-mechanical electrical scopes.
• Spie UK: Multi-technical services provider operating across the UK energy infrastructure market, including substation and transmission services for DNOs and TSOs. Comparable as a UK field-services peer delivering installation, maintenance and commissioning to utilities.
• Wilson Power Solutions: UK specialist in power and distribution transformers, including refurbishment, uprating and field services. Comparable as a UK-focused transformer lifecycle services specialist competing for similar utility maintenance and refurbishment work.

Others

• Nynas: Global manufacturer of naphthenic transformer oils whose UK packaged distribution is exclusively handled by Grosvenor Oil Services. Comparable as a critical upstream partner and as the supplier of the oil grades that underpin Grosvenor's regeneration and condition-monitoring services.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/grosvenor-power

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Grosvenor Power