Wind Turbine Supply Agreement
Produced in partnership with James Bruce of Gowling WLG and Aniela Foster-Turner of Siemens Gamesa
Wind Turbine Supply Agreement

The following Energy practice note Produced in partnership with James Bruce of Gowling WLG and Aniela Foster-Turner of Siemens Gamesa provides comprehensive and up to date legal information covering:

  • Wind Turbine Supply Agreement
  • What is a Turbine Supply Agreement (TSA)?
  • How the TSA will fit in with the wider package of construction contracts and operation and maintenance (O&M) contracts
  • Key provisions of a turbine supply agreement
  • Interface with operation of the wind farm
  • Differences between onshore and offshore TSA
  • Repowering

What is a Turbine Supply Agreement (TSA)?

The Turbine Supply Agreement (TSA) is a critical component of the contractual framework for a wind farm. This note analyses some of the key aspects of a TSA and how it fits into the wider contractual suite of documents used to construct, operate and maintain an onshore or offshore wind farm.

Wind farms consist of individual wind turbine generators (WTG) used to generate renewable power. Each WTG typically consists of a nacelle (which sits at the top of the WTG’s tower and houses the generating components), blades, tower and other critical components such as control and data equipment, generator and switchgear.

The TSA will typically cover the design, construction and delivery to site of these components, as well as the erection, commissioning and warranties in relation to each WTG. The form of the TSA may be a bespoke form or amended standard form, but will be tailored to suit the specific requirements of wind turbine supply contracts.

Most manufacturers have developed their own individual forms of TSA, but each TSA will generally cover the following issues:

  1. specifications—to what specification will the WTG be designed and manufactured, and how it will perform. The specification needs to be clear and unambiguous to ensure certainty of what will be delivered. Developers (and funders) will need to ensure that the specification of the equipment being

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