Great Britain electricity interconnector projects—construction contracts

The following Construction practice note provides comprehensive and up to date legal information covering:

  • Great Britain electricity interconnector projects—construction contracts
  • Key parties
  • Procurement
  • Form of contract used on electricity interconnector projects
  • Key issues in the EPC contract
  • Offshore issues
  • Testing
  • Performance monitoring
  • Defects
  • Spare parts and ongoing maintenance
  • More...

Great Britain electricity interconnector projects—construction contracts

This Practice Note examines some key issues in the construction arrangements of electricity interconnector projects carried out in the UK.

Electricity interconnectors are large transmission cables that transmit electricity from one country to another. An interconnector project will include the manufacture and installation of the cable itself (normally high voltage direct current (HVDC)) and the construction and fit out of an electricity substation (known as a converter station) at either end, which converts electricity between Alternating Current (AC) and Direct Current (DC). AC is used in each country’s transmission system, while DC is used for sending electricity along the high voltage subsea cables. For an introduction to electricity interconnectors, and how and where they operate in the UK, see Practice Note: Great Britain electricity interconnectors.

Electricity interconnector projects usually require a contractual structure comprising either one ‘wrapped’ construction contract or two separate construction contracts (see section ‘Form of contract used on electricity interconnector projects’) to:

  1. manufacture and install a cable which will carry the electricity between the countries or territories, and

  2. construct the converter stations at either end of the interconnector cable (once manufactured and installed) into which the interconnector cable runs

Existing and planned subsea electricity interconnectors connect the UK electricity transmission system with the equivalents in neighbouring countries such as France, Ireland, the Netherlands and the Scandinavian countries. Subsea interconnectors also operate (or are being constructed) elsewhere

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