Business Details
Expert Electrical Engineering Services
Pannell & Partners is a specialist electrical engineering consultancy with over 35 years of experience in power systems analysis, testing, and commissioning. Our expertise spans frequency response testing, partial discharge analysis, G99 compliance, and high-voltage condition assessment for land-based, marine, and offshore applications. We deliver tailored solutions to defence, renewable energy, industrial, and commercial clients across the UK and Republic of Ireland. Our engineers combine deep technical knowledge with practical problem-solving to ensure grid compliance, system reliability, and asset longevity.Recognised by National Grid as Independent Technical Experts, we provide on-site testing, data analysis, and expert reporting to meet stringent industry standards. Our commitment to precision engineering and client-focused service has established long-term partnerships with organisations including the Ministry of Defence and major renewable energy providers.
Services
Frequency Response Testing
Partial Discharge Analysis
G99 Compliance Testing
High-Voltage Condition Assessment
Power Quality Monitoring
Cable Testing
Pre-Commissioning Services
Marine Electrical Systems
Highlights and features
- 35+ years of specialist electrical power systems experience
- Recognised National Grid Independent Technical Experts (ITE)
- On-site testing capabilities for HV assets and frequency response
- Proven track record with Ministry of Defence and renewable energy leaders
- Tailored solutions for complex power quality and compliance challenges
Associations and certifications
- National Grid (Independent Technical Experts)
What people say
Never missed a grid deadline
Invaluable HV condition support
Expert commissioning service
Pragmatic system solutions
Quick mobilisation
Services
Frequency Response Testing
Specialist testing to ensure power systems meet National Grid requirements for dynamic containment, regulation, and moderation. Our engineers perform on-site frequency injection and measurement to validate system response times and power output stability. This service supports battery storage, renewable energy, and industrial clients seeking grid connection approval.
Partial Discharge Analysis
Advanced condition assessment for high-voltage assets using partial discharge and tan delta testing. We identify insulation degradation in cables, generators, and motors to prevent failures and extend asset lifespan. Our marine industry expertise includes Royal Navy platform assessments and cruise ship electrical system diagnostics.
G99 Testing
Comprehensive G99 compliance testing for embedded generation systems including solar PV, wind turbines, and battery storage. We conduct protection system commissioning, voltage step testing, and witness tests to ensure DNO approval. Our pre-commissioning service identifies issues before final inspections to avoid costly delays.
Power Quality Analysis
G5/4 and G5/5 power quality assessments using high-speed data loggers to measure harmonics, transients, and power factor. We help clients resolve distribution network operator (DNO) concerns and optimise electrical infrastructure to reduce penalties and equipment wear in industrial and commercial facilities.
Cable Testing
Non-destructive VLF testing for medium and high-voltage cables up to 60kV. Our portable systems detect partial discharge activity and insulation degradation in land-based and marine installations. Time domain reflectometry identifies fault locations while minimising stress on cable systems during testing.
People
Ross Pannell
Director
Chartered Electrical Engineer with 35+ years' experience in power systems design, condition assessment, and grid compliance. Leads technical operations and client relationships at Pannell & Partners.
Questions
What grid compliance services do you offer?
We provide National Grid-approved frequency response testing, G99 compliance, and power quality analysis to ensure system approval for renewable energy and industrial clients.
Can you test marine electrical systems?
Yes, our engineers specialise in high-voltage condition assessment for naval, cruise ship, and offshore platforms including partial discharge analysis and cable testing.
Do you offer pre-commissioning support?
We recommend pre-commissioning G99 testing to identify issues before DNO witness tests, preventing costly delays and ensuring first-time approval success.
How do you handle power quality issues?
Using advanced harmonic monitoring equipment, we diagnose G5/4 and G5/5 compliance issues and recommend corrective actions to reduce DNO penalties and equipment wear.
What industries do you work with?
We serve defence, renewable energy, industrial, commercial, and marine sectors with specialist electrical testing, commissioning, and condition assessment services.
