What TNEI Services does

TNEI Services Ltd is an independent, UK-headquartered specialist energy consultancy founded in 1974, operating from Manchester with regional offices in Glasgow, Newcastle, Dublin, Cape Town and the United States, and indicated activity in India. The firm employs 101–250 staff and serves transmission and distribution utilities, onshore and offshore renewables developers, conventional and industrial energy operators, hydrogen projects, and data centre operators across the UK, Ireland, Africa, the US and selected Asian markets.

The company's core assets are deep multi-disciplinary engineering capability and proprietary technology, most notably the IPSA power system analysis software (with modules for wind, wave and tidal energy modelling) and an in-house bespoke link-end analysis tool for wind farm design. Service delivery spans power systems design, feasibility studies, grid connection, environmental impact assessment, acoustics and noise monitoring (including involvement in ETSU-R-97 and the ARWTN guidance working group), shadow flicker, GIS and mapping, planning and consenting, due diligence, independent technical expert reports, arc flash calculations, and a "Training From TNEI" course programme. TNEI's track record includes noise assessments on more than 5 GW of onshore wind, capability assessments on over 3.9 GW of T&D-connected assets under NESO's ESR tender process, and Section 36 / planning consent wins on multi-turbine wind farms.

Commercially, TNEI runs a professional services model (project-based consulting fees) supplemented by IPSA software licensing and training course revenue. The firm is privately held with no disclosed parent, institutional investors or external funding rounds, and markets through direct enterprise engagement, industry events, content (TNEI Insights), webinars and LinkedIn. Certifications include ISO 9001 (since 2008), ISO 45001, ISO 14001 and Achilles UVDB pre-qualification, and recent recognition includes the 2025 Irish Renewable Energy Awards "Excellence in Renewable Services" and the 2025 SAWEA "Exceptional Service Provider" awards.

Name

TNEI Services

Legal name

TNEI Services Ltd

Website

https://tneigroup.com

Company type

Private

Founded year

1974

Operating status

Operating

Headcount range

101–250 employees

Short description

TNEI Services is a UK-headquartered specialist energy consultancy (founded 1974, 101–250 staff) that delivers technical, strategic, environmental and consenting advisory services — including power systems design, grid connection, EIA, and noise assessment — to utilities, renewables developers, and industrial energy operators across the UK, Ireland, the US and Africa, supported by its proprietary IPSA power system analysis software.

Ownership category

akta.pro rank

Product category

Energy Consultancy Services

NAICS

Management, Scientific, and Technical Consulting Services (5416), Other Scientific and Technical Consulting Services (54169), Electric Power Generation, Transmission and Distribution (2211)

SIC

Electric Services (4911), Electric, Gas & Sanitary Services (4900)

akta.pro primary industry

Transmission Reliability, Resilience & Emergency Restoration (NERC/ENTSO-E Compliance) (EUADAAAO)

akta.pro secondary industry

System Operations & Control Centers (EMS/SCADA for Transmission) (EUADAAAG)

Keywords

• Energy consultancy services
• Power systems analysis
• Renewable energy consulting
• Grid connection studies
• Environmental impact assessment

Headquarters

HQ city

Newcastle

HQ country

Australia

HQ region

Oceania

Offices6 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Consulting Services: TNEI provides technical, strategic, environmental and consenting advice to organizations operating within conventional and renewable energy sectors. Services include power systems design, feasibility studies, grid connection analysis, due diligence, environmental impact assessment, planning and consenting, and expert witness services.
2. IPSA Software Licensing and Training: TNEI develops and licenses its proprietary IPSA power system analysis software. They also provide associated training courses for the software.
3. Training Services: TNEI provides training courses under the 'Training From TNEI' banner, including environmental and technical training programs.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

TNEI Services is a specialist energy consultancy providing technical, strategic, environmental, and consenting advice to clients in the conventional and renewable energy sectors. Its offerings span power systems design, feasibility studies, grid connection analysis, due diligence, environmental impact assessment, planning and consenting, and expert witness services, complemented by proprietary IPSA power system analysis software that is licensed along with associated training courses.

Product overview

TNEI Services is a specialist energy consultancy offering a comprehensive portfolio of technical, strategic, environmental, and consenting advisory services. The core offering includes IPSA Software (power system analysis software), alongside 14 specialized consultancy services covering the full project lifecycle from feasibility and design through to planning, grid connection, and operational support. The company operates across transmission and distribution, onshore and offshore renewables, conventional energy, hydrogen, and data centre sectors.

Differentiator

Problem solved

Functional benefit

Brands

• IPSA Software: Proprietary power system analysis software developed and owned by TNEI for analysis of power systems, wind farms, and wave/tidal energy

Products and services

• IPSA Software Proprietary power system analysis software developed and licensed by TNEI for modeling and analyzing electrical networks, including capabilities for wind farm analysis and wave/tidal energy analysis. Targeted at power systems engineers and energy sector analysts.
• Power Systems Design Technical consultancy for designing power systems for energy projects.
• Feasibility Studies Assessment services evaluating the technical and economic viability of energy projects.
• Grid Connection Expert support for connecting renewable energy projects to electricity networks, including grid code compliance and connection studies.
• Acoustics and Noise Monitoring Noise assessment services for wind farms and other energy developments, including ETSU-R-97 and ARWTN-aligned assessments.
• Innovation and Data Science Advanced analytics and innovative solutions for the energy sector.
• Due Diligence Technical and commercial due diligence services for energy investments.
• TNEI Training Courses Professional training programs for the energy industry, including IPSA software training and environmental/technical training under the 'Training From TNEI' banner.
• Environmental Impact Assessment Comprehensive EIA coordination, project management, and technical specialist services including noise, shadow flicker, socio-economics assessments, GIS and mapping support.
• GIS, Mapping and Analysis Geographic information system services and spatial analysis for energy projects.
• Shadow Flicker Assessment Assessment of shadow flicker effects from wind turbines on nearby properties.
• Planning and Consenting Planning application support and regulatory consenting services for energy projects.
• Electricity Networks Analysis Analysis and consultancy for electricity transmission and distribution networks.
• Independent Technical Expert Reports Technical expert witness and reporting services for regulatory and legal processes, including public inquiries.
• Data Centre Services Technical consultancy services for data centre power infrastructure, including electricity network analysis and grid connection support.

Quantifiable outcome

• Undertook noise assessments for more than 5 GW of onshore wind developments
• +3 more outcomes

Named customers8 records

Segments6 records

Ideal customer profiles6 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• ENWORKSminorImplementation/ SI/ Consulting PartnerTNEI was selected to join ENWORKS' bank of specialist consultants helping deliver award-winning environmental support to businesses across the North West of England. ENWORKS provides free environmental support to businesses and TNEI contributes specialist energy expertise.

Scale indicators5 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• WSP: Global professional services firm with a strong UK energy and environment practice. Competes with TNEI on onshore and offshore wind environmental impact assessments, planning, and grid-related advisory for utility and developer clients.
• Mott MacDonald: Major engineering consultancy with established energy and renewables practices covering power systems, environmental, and consenting services. A direct competitor for UK/Ireland renewables EIA, planning, and grid connection mandates alongside TNEI.
• AFRY: European engineering and design consultancy (formerly ÅF/Pöyry) with substantial energy and renewables practices. Competes with TNEI on power system studies, grid connections, and offshore wind advisory across European markets.
• DNV: Global assurance and energy advisory firm providing renewable energy consultancy, grid advisory, power system studies, and certification. Competes with TNEI on wind farm technical advisory and grid connection studies but at a much larger scale and broader service portfolio.
• Wood Group: Global engineering and consultancy with a sizable energy transition and renewables practice. Overlaps with TNEI on offshore wind technical due diligence, grid, and EIA-adjacent advisory, often serving the same UK and international developer clients.
• Arcadis: Global design and consultancy firm with a sizable energy and environment practice. Competes with TNEI for UK/EU renewables EIA, planning, and grid advisory mandates, often bundled with broader infrastructure programs.

Direct peers

• Ricardo: Engineering and environmental consultancy with a UK energy practice covering power systems, grid, and renewables. Closely comparable to TNEI's multidisciplinary technical-environmental offering and similarly serves UK utilities and developers.
• SLR Consulting: Environmental and advisory consultancy with strong UK renewables EIA, planning, and acoustics capability. Direct overlap with TNEI's onshore wind noise/EIA and consenting service line for the same developer customer base.
• Baringa Partners: Specialist energy and resources consultancy with deep UK/European utility client base. Directly comparable to TNEI on power markets, grid, and renewables advisory, although Baringa skews more toward commercial/strategy work than TNEI's technical power systems focus.

Emerging players

• Energy Systems Catapult: UK-based technology and innovation catapult focused on clean energy systems, grid modernization, and energy data. Adjacent to TNEI's Energy Networks practice, particularly around innovation, grid reform, and TNEI's head of innovation remit.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/tnei-services-ltd
• Xx.com/tneiservices

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries3 records

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 TNEI Services