Jurisdiction(s):
United Kingdom

Key definition

Supply definition

What does Supply mean? Supply describes the provision of goods, services or rights by one party to another for consideration. In UK VAT law it is a defined term: Value Added Tax Act 1994, s.5(2)(a) states that “supply includes all forms of supply”, and s.5 distinguishes between a supply of goods and a supply of services, with deeming rules (such as self-supplies). In Ireland, the Value-Added Tax Consolidation Act 2010 similarly defines supply of goods and supply of services on a broad basis. The concept is central to VAT, determining whether a transaction is taxable, the place and time of supply (tax point), and...

Drafting and Negotiating Wind Turbine Supply Agreements: Key Terms, Risk Allocation, Performance and Warranties, Interfaces with BOP, EPC and O&M, and Onshore/Offshore, Repowering and Technology Considerations

Published by a LexisNexis Energy expert

Practice notes

What is a turbine Supply agreement (TSA)?

The turbine supply agreement (TSA) is a pivotal element within the contractual structure for both onshore and offshore wind farms. This note considers key aspects of a TSA and how it fits within the wider suite of contracts used to construct, operate and maintain a wind farm. Wind farms are made up of individual wind turbine generators (each a WTG) that produce renewable power. A typical WTG includes a nacelle—positioned at the top of the tower and housing the generating components—together with other essential parts:

Blades
Tower
Control and Data equipment
Generator
Switchgear

A TSA usually covers the design, manufacture and Delivery to site of these components, as well as the Commissioning and performance of each WTG. The agreement may take a bespoke form or an amended standard form, tailored to the particular requirements of wind turbine supply contracts. For further practical guidance on key legal issues in the wind sector, see the textbook: Wind: Projects and Transactions.

Key provisions of a turbine supply agreement

The specific terms of the TSA will vary between turbine suppliers...

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Tim Williams

Osborne Clarke

Tim is a senior associate in Osborne Clarke's corporate team in London. Tim advises a range of sponsors, developers and suppliers on acquisitions, disposals, joint ventures, restructurings and other corporate transactions in the energy and infrastructure sector across the UK and Europe. Tim has particular experience assisting on transactions relating to solar, battery storage and offshore wind projects at the bidding, development, construction and operation phases (including OFTO disposals). Tim also has experience advising on corporate transactions involving other low carbon technologies including onshore wind, anaerobic digestion, hydropower, hydrogen, smart grid and EV charging....

Web page updated on 21/05/2026

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