The Team

Expert Power System Consultants

Our Engineers

  • Stephen Sommerville


    Stephen Sommerville is the Director of SPE Electrical. He has over 18 years of experience in HV power systems, gained from working in a number of different industries. Stephen is a specialist in power system studies and HV earthing. He has a broad range of knowledge in a wide range of packages such as DigSILENT, ETAP, SKM, EMTP, CDEGS, PSCAD & AMTECH. As well as system studies, Stephen also has expert knowledge in power system protection and control, substation automation (IEC 61850), large VSDs as well as HV and EHV transmission systems technology and is also our resident earthing specialist.

  • Mark Horrocks

    Engineering Manager

    Mark Horrocks is SPE's Engineering Manager and a specialist in power system studies. He has over thirteen years experience in electrical power system analysis, electrical design, power system studies (power quality), arc flash safety, marine electrical systems, fault finding and the development of practical solutions for complex issues. Mark is an expert user of DigSilent PowerFactory, and always keen to develop his skills and knowledge in the field of system studies. Mark is an active member of the engineering community and sits on a number of key committees in the UK for Distribution Code and other key standards.

  • John Portess

    Senior Consultant

    John Portess is a Senior Consultant with over 40 years experience. He has over forty years experience in electrical generation, distribution and electrical services design, specification, procurement and installation. He is conversant with current techniques for distribution network loadflow, fault analysis and protection co-ordination and has worked across a wide range of industries and specialisms.

  • Tibor Hoffman

    Associate Senior Consultant

    Tibor Hoffman is an Associate Senior Consultant with over 15 years experience gained in the mining, oil & gas and industrial sectors. He is a specialist in power system studies and has experience in both ETAP and SKM Powertools. Tibor has carried out a wide range of studies and has experience in numerous different study types.

  • Lee Milliken

    System Studies Engineer

    Lee Milliken is a System Studies engineer with over 2 years experience in the UK, having worked in both distribution and switch gear design. Having recently joined SPE, Lee is developing a specialism in power system studies for loadflow, shortcircuit, motor starting and arc-flash and has experience in ETAP and is currently learning DiGSILENT.

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