Jurisdiction(s):
United Kingdom

Key definition

GW definition

What does GW mean? GW means gigawatt, a measure of power used in energy and infrastructure documents to describe very large electricity generation or transmission capacity (for example, the size of an offshore wind farm, interconnector, nuclear unit or battery storage project). One gigawatt equals 1,000 megawatts (MW), or one billion watts (W). It is a descriptive scientific unit (an SI prefix applied to the watt) rather than a term specially defined in energy legislation or case law. Statutes and regulatory schemes in England & Wales, Scotland, Northern Ireland and Ireland commonly state capacity thresholds in MW, but market participants and policy papers often summarise...

UK onshore wind life extension and repowering: legal, planning, property, grid (TMO4+), revenue and finance issues; CfD eligibility for repowering from AR7; guidance for developers and lenders

Published by a LexisNexis Energy expert

Practice notes

UK onshore wind extension of life and repowering projects

Across the UK, onshore windfarms are generally planned and approved to run for around 20–25 years. As much of the installed fleet nears that age through the late 2020s and into the 2030s, attention is shifting from constructing new sites to squeezing more value from existing ones. Owners and developers are therefore increasingly considering either prolonging the operation of current turbines or replacing them with new machines — routes commonly labelled ‘extension of life’ and ‘repowering’ respectively. This Practice Note outlines what these options involve and the rationale for investing in them, and highlights principal considerations for onshore windfarm owners and developers and, for repowering in particular, project finance lenders, including:

Corporate structure and ownership
Licensing
Revenue strategy
Grid connection
EPC
O&M
Planning and permitting
Property rights
Project finance considerations

It also assesses whether such projects may qualify for revenue support under a UK government subsidy. This Practice Note proceeds on the basis that any extension of life or repowering initiative is undertaken in the context of...

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Web page updated on 22/05/2026

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