What JSM Group does

JSM Group is a UK-headquartered specialist infrastructure engineering company that designs, builds, commissions, and maintains complex power networks, digital infrastructure, and civil engineering assets for enterprise clients. Founded in 1998 in London, the company has grown to 300+ employees operating across the UK, Ireland, Germany, Sweden, and Bahrain, delivering high-voltage grid connections from 11kV to 400kV, substation construction, hollow core fibre and dark fibre deployment, civil engineering services, and 24/7 fault response and maintenance for transmission and distribution networks.

The company's core technology platform centres on integrated turnkey delivery of power and digital infrastructure, combining in-house design, civil engineering, HV cabling, and commissioning teams. Proprietary no-dig methods NICE® (Non-Intrusive Cable Extraction) and NITE (Non-Intrusive Tank Extraction) are National Grid-approved registered technologies for safe removal of decommissioned fluid-filled cables and tanks without traditional open-cut trenching. The company also holds Ofcom Code Powers for telecoms infrastructure deployment and maintains NERS, WIRS, GIRS, ISO 9001/14001/45001/27001, and SOC 2 accreditations, enabling it to operate across power, water, gas, and telecoms sectors under a single integrated management system.

JSM generates revenue through three streams: project-based infrastructure engineering services (turnkey HV power and digital infrastructure projects delivered via EPC and fixed-price contracts with DNOs, network operators, and private developers), recurring fault response and maintenance services (24/7 framework agreements with National Grid and UK DNOs), and front-end advisory services (route feasibility, design viability, stakeholder coordination, and cost modelling). Customers span hyperscale data centre operators (e.g., maincubes), renewable energy developers (e.g., Island Green Power's Lime Down Solar Park), telecoms operators, UK DNOs (UK Power Networks), National Grid, property developers, and transport/defence infrastructure operators. The company is majority-owned by TowerBrook Capital Partners since 2024, with Rutland Partners as a prior investor from 2021.

Name

JSM Group

Legal name

JSM Group Services Limited

Website

https://jsmgroup.com

Company type

Private

Founded year

1998

Operating status

Operating

Headcount range

251–500 employees

Short description

JSM Group is a UK specialist infrastructure engineering company that designs, builds, and maintains high-voltage power networks, digital infrastructure, and civils for hyperscale data centres, renewable developers, telecoms operators, and UK utilities. The 300+ person firm operates across the UK, Ireland, Germany, Sweden, and Bahrain.

Ownership category

akta.pro rank

Headquarters

HQ city

Potters Bar

HQ country

United Kingdom

HQ region

Europe

Offices7 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Infrastructure Engineering Services: Project-based engineering and construction services delivering complex power infrastructure, digital infrastructure, and specialist systems. Services include turnkey solutions from concept design through construction to energisation and commissioning, covering high-voltage grid connections, substations, hollow core fibre installation, civil engineering, and fault maintenance. Revenue is earned through fixed-price contracts, EPC (Engineer Procure Construct), and framework agreements with DNOs, network operators, and private developers.
2. Advisory Services: Front-end consultancy services working with developers, city planners, business owners, and utility companies to de-risk strategy, validate feasibility, and provide expert oversight. Includes route feasibility, design viability, stakeholder coordination, and cost modelling.
3. Fault Response & Maintenance Services: 24/7 fault response and maintenance services for electricity networks, including EHV fault repairs, oil/gas filled cable repairs, substation maintenance, emergency call-out, and operational control. Long-standing partnerships with National Grid and UK DNOs.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

JSM Group is a specialist infrastructure engineering company that delivers full turnkey power, digital infrastructure and advisory solutions for enterprise clients. Its services span high-voltage grid connections (11kV to 400kV), substation design and construction, civil engineering, hollow core fibre and dark fibre installation, and 24/7 fault response and maintenance for utility and energy networks. All work is self-delivered by in-house teams from concept design and stakeholder coordination through construction, commissioning and long-term support.

Product overview

JSM Group is a specialist infrastructure engineering company offering an integrated portfolio of infrastructure solutions organised around three core service pillars: Power (high-voltage grid connections and turnkey electrical solutions), Digital Infrastructure (telecom civil engineering, hollow core fibre, and dark fibre), and Advisory (technical consultancy). The company also provides specialised Civils services, Substation solutions, and Faults & Maintenance services. All specialisms are delivered in-house through self-delivery teams, enabling complete oversight from initial design through long-term support. The Foundations framework underpins operations with health & safety, environmental management, social value, governance, and quality accreditations. The company operates across the UK, Europe (Germany, Ireland, Sweden), and Bahrain.

Differentiator

Problem solved

Functional benefit

Products and services

• Power High-voltage grid connections and turnkey power solutions, providing comprehensive electrical engineering services including new and upgraded connections, substations (11kV to 400kV), cable installation, faults and maintenance, and specialist services such as NICE® and NITE. Delivered for data centres, renewable energy developers, DNOs and National Grid.
• Digital Infrastructure Digital infrastructure deployment and telecoms civil engineering services, including hollow core fibre, dark fibre, civil works, cable installations, fibre connections, and maintenance for data centres, telecoms networks, and modern industries. Delivered for telecom carriers, network operators and hyperscalers.
• Advisory Infrastructure consultancy and technical advisory services. Works with developers, city planners, business owners, and utility companies to de-risk strategy, validate feasibility, and build confidence before construction through route feasibility, design viability, stakeholder coordination, and cost modelling.
• Civils Civil engineering services covering excavations, duct installation, horizontal directional drilling (HDD), chamber/manhole construction, utility diversion works, and emergency call-outs. Delivers infrastructure across power, telecoms, and gas sectors.
• Dark Fibre Dark fibre infrastructure solutions providing organisations with direct control over network capacity and performance for ultra-fast data transmission, dedicated connectivity, and long-term scalability. Supports data centres, enterprise networks, renewable energy infrastructure, and cloud environments.
• Hollow Core Fibre Advanced hollow core fibre (HCF) solutions enabling light to travel faster for greater connectivity speeds. Includes design, network integration support, engineering and consulting services. JSM has 25+ engineers trained and certified to deliver HCF installations.
• Substations Comprehensive substation solutions across the full voltage spectrum (LV, HV, EHV). Capabilities span design, construction, commissioning, switchgear and transformer installations, and innovative containerised solutions for flexible power distribution.
• Faults & Maintenance 24/7 rapid fault response and maintenance capability for 11kV to 400kV XLPE and fluid/gas-filled cable systems. Includes expert jointing, repair, fluid-filled cable pumping, oil sampling, PFT dosing, leak detection, and full lifecycle support including decommissioning and recycling services.

Quantifiable outcome

• 99% recycling rate across the Group with 67,506 tonnes of material reused, recycled or recovered
• +3 more outcomes

Named customers8 records

Segments6 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Ten partnerships are on record, tiered core, board, project and supporting.

• maincubescoreStrategic or Co-development Partner · 1 May 2026JSM Group commenced construction of critical power infrastructure for maincubes' Berlin Data Centre Campus in Nauen, Germany. JSM is responsible for delivery of the company-owned 110kV cable route and substation - approximately 6km cable route from renewable energy sources to site, with 200MW grid connection capacity.
• John LeahyboardOthers · 1 January 2021John Leahy joined JSM as Chairman in April 2021, bringing track record of value creation in private equity. He served as Operating Partner at Doughty Hanson for 18 years and has expertise in renewable energy including 12 years as Chairman of LM Windpower and current role at GEV Windpower.
• Island Green PowerprojectStrategic or Co-development PartnerJSM is involved in delivering civil preconsent activities for Lime Down Solar Park cable route, a proposed utility-scale solar PV and battery energy storage scheme being developed by Island Green Power in Wiltshire, anticipated to deliver up to 500MW of renewable electricity.
• Network RailprojectStrategic or Co-development PartnerJSM engages with Network Rail for works impacting rail assets, including Network Rail BAPA submissions and approvals for works under rail infrastructure for projects like Lime Down Solar Park cable route.
• National HighwaysprojectStrategic or Co-development PartnerJSM engages with National Highways for planning and assurance of intrusive works under live-network constraints, including M4 crossing for Lime Down Solar Park project.
• National GridcoreStrategic or Co-development PartnerLong-standing 22+ year partnership with National Grid for fault response and maintenance services. JSM's NICE® method is an approved method of cable extraction for National Grid. Operating 24/7 fault response capability.
• UK DNOs (Distribution Network Operators)coreStrategic or Co-development PartnerLong-standing partnerships with UK Distribution Network Operators for connections projects, fault response, and maintenance. JSM works with host DNOs and National Grid to align project programmes to achieve desired energisation dates.
• HSP TrainingsupportingImplementation/ SI/ Consulting PartnerTraining partner supporting JSM's Leadership Academy, including NVQ assessment for Front-Line Supervisors completing Level 1 'Leading the Frontline' programme leading to CITB Supervisor CSCS Gold Card.
• CITB (Construction Industry Training Board)supportingOthersJSM Group Training Centre delivers CITB-accredited training programmes including SMSTS, SSSTS and Refreshers. The Leadership Academy programme leads to CITB Supervisor CSCS Gold Card following NOCN Level 3 Occupational Work Supervision NVQ.
• E.DIS NetzprojectStrategic or Co-development PartnerE.DIS Netz is the distribution network operator for the maincubes Berlin campus area. JSM is coordinating with E.DIS for the 200MW grid connection through their regional electricity distribution network.

Scale indicators11 records

Recent moves10 records

Expansion highlights6 records

Direct peers

• Costain Group: UK-listed infrastructure engineering contractor with a focused Energy & Water division delivering complex infrastructure projects. Comparable to JSM in its emphasis on HV power, water utility, and infrastructure engineering for regulated clients, though operating at a larger scale and broader scope.
• Clancy Group: Privately held UK multi-utility infrastructure contractor working on power, gas, water, and telecoms networks. Comparable to JSM in delivering multi-utility connections, civils, and HV projects for UK utilities and developers, with similar mid-market scale.
• M Group Services: UK-based infrastructure services group delivering utility, telecoms, and energy-from-waste projects. Closely comparable to JSM in scope (multi-utility connections, EHV, fibre), geographic focus (UK primary), and customer base (DNOs, telecoms operators, developers).
• Linxon: Hitachi Energy and AtkinsRéalis joint venture specialising in turnkey substation delivery and grid connections for utilities. Closely comparable to JSM's Power business — both focus on HV substation EPC and grid connection delivery for transmission and distribution clients.
• Keltbray Group: UK-headquartered specialist infrastructure contractor operating across energy, rail, and built environment. Comparable to JSM in delivering complex civil engineering and infrastructure projects for regulated utility and energy clients in the UK.

Broad incumbents

• Skanska: Global infrastructure contractor with significant utility and energy exposure. Comparable to JSM through civil engineering and infrastructure delivery for power and telecoms clients, but with a much larger international footprint and broader infrastructure portfolio.
• Balfour Beatty: Major UK-listed infrastructure group with a substantial Power Transmission & Distribution business. Overlaps with JSM in HV cable installation, substation delivery, and DNO/National Grid frameworks, but operates at far greater scale and across broader end markets (rail, highways, construction).
• Morgan Sindall: UK-listed construction and infrastructure group with a strong energy and utility services division. Overlaps with JSM in HV, telecoms, and infrastructure delivery for regulated clients, but with substantially larger revenue base and broader end-market exposure.

Others

• Mott MacDonald: Global engineering consultancy advising on power, transmission, and major infrastructure projects. Adjacent to JSM through consulting on the same complex HV and infrastructure projects JSM executes, and operates JV infrastructure delivery (Mott MacDonald Bentley) that directly competes for similar UK civil schemes.
• Siemens Energy: Global supplier of HV substation equipment, grid technology, and transmission systems. Relevant as an enabling technology provider that JSM integrates into delivered projects (substations up to 400kV) and as an adjacent participant in the same HV grid-connection value chain.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/jsm-group-services-ltd

Compliance9 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles18 records

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 JSM Group