Welcome to APS

Comprehensive
Power System Studies

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.

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.

APS wider services

Beyond Power System Studies

Power system studies are only one part of the project journey. APS also supports clients through testing capability and independent technical consultancy, helping engineering findings be checked, challenged and translated into confident project decisions.

APS engineer conducting high-voltage testing using Omicron equipment on site
Site validation

Test & Commissioning

APS can support testing and commissioning activities where practical site validation is required. The focus is to help verify that measured outcomes and site observations are consistent with the assumptions, conclusions and recommendations developed during the engineering studies.

APS technical consultancy — independent engineering review for power and infrastructure projects
Independent advice

Technical Consultancy

APS provides independent technical consultancy for complex power, infrastructure, renewable and industrial projects. Support can include technical review, engineering advice, standards interpretation and practical guidance where clarity, safety, risk and performance need to be carefully considered.

Wider APS capability

Beyond Power System Studies

APS connects specialist studies with testing capability and technical consultancy, helping clients move from analysis to validation, review and confident project delivery.