United Kingdom
View the UK registered office details.
UK Registered Office
Address18 Canberra Road
Gretna, Dumfriesshire
Scotland
DG16 5DP
Gretna, Dumfriesshire
Scotland
DG16 5DP
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Welcome to APS
Comprehensive Power System Studies and Engineering Consultancy
Specialist engineering studies supporting projects across battery storage, wind, and solar technologies.
Power System Studies
Engineering Studies That Support Confident Decisions.
APS provides focused power system studies for projects where electrical performance, compliance and design risk need to be understood before decisions are made.
View Study Areas
Independent AssessmentClear FindingsPractical Engineering Advice
Insulation Coordination
APS provides insulation coordination studies to assess switching overvoltages, temporary overvoltages, lightning-related stresses, surge arrester performance, and equipment withstand requirements. The studies support safe selection of insulation levels and help reduce the risk of dielectric failure in substations, renewable plants, industrial networks, and grid connection projects.
Grid Compliance and Connection Studies
APS supports developers, consultants, and asset owners with grid connection studies for wind farms, solar plants, BESS, industrial sites, data centres, and substations. The service includes load flow, short-circuit, reactive power capability, voltage compliance, contingency assessment, and dynamic performance studies using recognised power system analysis tools.
Electromagnetic Interference Studies
APS provides EMI and AC interference studies to assess the impact of power networks on nearby metallic infrastructure, pipelines, rail systems, telecom assets, and sensitive installations. The analysis considers conductive, inductive, and capacitive coupling to identify transferred voltage risks, coating stress, safety concerns, and practical mitigation requirements.
Advanced Grid Dynamics Studies
APS carries out advanced RMS and EMT studies for complex power systems, including dynamic stability, harmonic resonance, weak-grid behaviour, SSCI, SSTI, and converter-driven interactions. These studies can be provided as independent technical support alongside TSO, DSO, or DNO grid connection processes
Power Quality Assessment
APS provides power quality studies to assess harmonics, voltage distortion, flicker, unbalance, resonance risk, and disturbance propagation in electrical networks. The studies help identify compliance issues, filter requirements, resonance conditions, and the impact of nonlinear loads, converters, renewable generation, and industrial equipment.
Relay Coordination Studies
APS delivers protection coordination studies to verify that protection devices operate selectively, reliably, and within the required fault-clearing times. The service includes short-circuit analysis, relay setting review, time-current grading, backup protection checks, and assessment of overcurrent, earth fault, differential, distance, and generator protection functions.
Early-Stage Energy Screening
APS evaluate grid capacity, renewable potential, BESS opportunities, data centre integration, connection options, and optimal hybrid technology mix at the earliest stage of project development, providing clear visibility before detailed feasibility studies, grid applications, and investment decisions.
Cable Sizing, Ampacity and Thermal Rating
APS carries out cable ampacity and thermal rating studies for underground and subsea cable systems. The service considers cable construction, installation arrangement, soil thermal resistivity, bonding configuration, load profile, grouping effects, and environmental conditions to determine safe continuous and emergency current ratings.
MV/HV Substation Design
APS provides MV/HV AIS and GIS substation design support, including access road/passway requirements, typical layout development, equipment selection and sizing, busbar forces, cable sizing, P&C integration, earthing design, and compliance with DNO/TSO requirements.