Case Study

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Hull Energy - Siemens

Hull Energy Works will be the first facility of its kind in the UK, using a combination of innovative renewable energy technologies to achieve a highly efficient mix of recycling and energy conversion processes.

Excalon was contracted by Siemens to complete the contestable connection from the newly constructed site to Northern Powergrids Cornwall Street Substation. The 250 metre cable route to the allocated point of connection was not without  complications, including the crossing of Cleaveland Street in the centre of Hull and a design solution to excavate beneath the flood defences at Cornwall Street Substation.

Excalon’s scope included the design of the cable route and the electrical design specifications to meet the client’s requirements including an alternative route to that proposed by the DNO. Along with provision of the ICP connection, Excalon delivered the on-site construction of the privately owned 132/11kV power transformer, including commissioning through to energisation via Excalon’s Senior Authorised Person. Full liaison with multiple contractors was undertaken to ensure an efficient programme of works.

Civil works were completed on programme before the end of 2016.  132kV cable installation was undertaken in January, with the private 11kV connections installed and terminated within the power plant once buildings had been constructed and plant installed.

Excalon’s EHV Division’s primary contract and responsibilities were to deliver:



  • Full turnkey project
  • Full project management
  • Full site set up
  • Stakeholder management
  • Traffic management
  • CAD As-Built drawings
  • All NRSWA notice management.
  • CDM design and build


  • Excavation in public highway
  • Excavation in live substation and construction site
  • All associated fibre installation and boxes
  • Duct installation for 132kV cables and fibre
  • Installation of 11kV and 132kV cables through ducts
  • Supply of 11kV and 132kV cable and accessories
  • Transformer plinth and compound construction.


  • Full electrical design
  • Full civil design, including temporary works for deep excavation
  • 132kV jointing and terminations
  • 11kV installation and jointing
  • Electrical pressure testing, including partial discharge
  • Earth bonding installation
  • Transformer erection, oil handling and commissioning.

Case Study Specifics

Client: Siemens

Duration: 6 Months

Services Provided:

  • Full turnkey solution
  • Full project management
  • Design
  • Stakeholder management
  • Traffic management
  • Excavations and preparation of joint bays
  • 11kV and 132kV Cable installation, jointing and termination
  • Electrical pressure testing, including partial discharge
  • Earth bonding installation

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