2.4 Electrical Design



Prepare a comprehensive design to optimise procurement and construction of electrical works.


  • Inexperience leading to inefficient and unsafe designs,
  • construction price uncertainty and delays with related contract negotiations,
  • absence of optimisation.

Forte’s Risk Mitigation:

  1. Forte uses its experience from designing, constructing and asset management of onshore and offshore MV/HV wind farm electrical systems to safeguard designs.
  2. Using this experience and valuable lessons learned we ensure a high quality and optimised design is provided to the client.
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√ Extensive experience of delivering on/offshore electrical infrastructure    

√ Dedicated experts to provide best-in-class designs for tender and construction



A well-produced electrical design is necessary to determine layout, dimensions and related quantities for proposed electrical and telecommunication infrastructure to connect the wind farm to the Point of Common Coupling (PCC) with the national grid infrastructure.

This is essential for confirming the feasibility and economic viability of locating the WTG at its permitted location and for facilitating electrical and road designs.


1) Sign a) multiple work package (“EPC Manager”) contract or b) single-work package contract with Forte.

2) Issue all required project site information and employer requirements/preferences

3) Issue Forte with Work Package Instruction to Proceed


A typical wind farm design process can be split in 2 phases:

Phase 1: IFT Design

Design providing indicative infrastructure layouts and single line diagrams (SLDs), equipment specifications and detailed listing of required equipment

  • Conduct reviews and document completeness check for the Grid Owners Technical and Financial Connection Offer, OEM Specifications, Client requirements,
  • Commence IFT Design and investigate potential optimisations and value engineering
  • Issue IFT Design so that client can procure the electrical construction works


Phase 2: IFC Design

Expands upon the items above and specifies equipment to be used, defines precisely the required layouts, specifies protections and an exhaustive set of SLDs for HV, MV and LV systems.

  • Finalise layouts after value engineering and consultation with client
  • Execute Detailed Design in line with IFT specifications
  • Issue all IFC deliverables necessary to construct the Electrical Works


Design Package Contents

Results shall be presented in a combined package of reports and drawings as follows (non-exhaustive list): Technical Descriptions, Calculations, Cabling Layout Plans and Cross Sections, Single Line Diagrams, PDL layouts and Equipment listing etc.

This can be further broken down as follows:

  • Detailed technical description including: List of Input Documents, Terms of reference list (“technical assumptions, List of referred National and Industry Standards
  • Load flow, short-circuit and loss calculations
  • MV cable design: cross sections, lengths, cable parameters, cable trenches and cable terminals, cable ducts through WTG foundations,
  • Fibre optic cable design: splice boxes, cable parameters, cable trenches and connectors
  • Earthing of PDL(s) and WTGs
  • Electrical work and installation description, protections
  • List of documentation/deliverables needed for detailed engineering phase, FAT, SAT and commissioning requirements

√ Result: Provision of best-in-class documentation to be used for Electrical Works procurement and construction.

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