Elys’ services: wind power

Development and finance

Elys relies on its field experience to support developers and investors in the initial project phase.

Early stage Design for permiting and/or budget evaluation
Road Survey

Electrical Basic Design

  • Preliminary layout
  • Preliminary Single Line Diagram
  • Definition and rating / sizing of main equipment specifications
  • Dimensionnement et spécifications des infrastructures électriques
  • Earthing Potential calculation for gas pipe compliance or low voltage installations

Civil Basic Design

  • Geotechnical Report
  • Access Roads and Platforms Layout
  • Access Roads and Platforms structure Pre-Design
  • Foundation Pre-Design


  • Drawings/layouts
  • Photomontage

CAPEX & OPEX Estimations

Grid analysis
Review and proposal of the different potential Grid Connections option
Negociation of solutions with the utility
Budget evaluation

Bid Specification preparation
Tender Procedure
Employer’s Requirements
Bidders Prequalification
Bid Evaluation
Contract Negotiation
Contract Award

Due Diligence Review

  • Independant review and technical opinion on a Due Diligence provided by a Vendor

Due Diligence report

  • Energy Yield Assessment
  • Technology Review
  • Site Conditions and Suitability for the Site
  • Electrical Infrastructures Design Review
  • Balance of Plant Design Review
  • Grid Interconnection Review
  • Electrical Infrastructures agreement Review
  • Balance of Plant agreement Review
  • Contractual interfaces Review
  • Financial Model Review
  • Permitting and Environmental Compliance
  • Project Schedule Review


We use our own teams to design the civil and electrical infrastructure (BoP).

Load Flow / Losses
Short Circuit
Selectivity/Protections studies
Harmonics studies
Earthing system calculation
Grid Compliance studies
Stability studies
Regulation design/studies (P/Q/U)
Lines/Cables studies
Single Line Diagrams
SCADA design and implementation

Fondation design
Road & Cranes plateforms design
hydraulic design
Development of 3d plans with Covadis


Remaining as true to the site as possible, we ensure that quality, costs, planning and safety are respected during construction.

Tender Support / Preparation
Project Management
BoP Civil Works Site Management
BoP Electrical works Site Management (MV network & HV Substation)
Mechanical Assembly supervision
Commissioning supervision
Contractors’ coordination – Planning
Quality inspections
Budget monitoring
Invoices approval
Taking over management (punch list)
Contract amd claim management
EHS management

Construction reports review
Change Orders Review and Approval
Periodical site visit
Ongoing technical and contractual assistance

Medium voltage
high voltage transformer/high voltage station

Lender advisor


O&M audits

Benefit from our expertise to ensure your production assets remain stable (audits, resolving problems).

Due diligence

Expertise on HTB workstations in operation

Production optimization / Cost reduction for Wind Farms in O&M


Elys is a pioneer when it comes to engineering wind repowering projects, allowing you to benefit from its extensive experience in this field.

Requalification of existing infrastructure and adaptation for repowering
Study of demolition work to be planned
Demolition Material Reuse Study
Optimisation of the disassembly / installation schedule for new wind turbines