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GW meaning

Published by a LexisNexis Energy expert
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 project pipelines and system capability in GW. Usage is consistent across these jurisdictions. In practice, GW figures appear in planning and consenting materials, grid connection agreements, EPC contracts, power purchase agreements, Contracts for Difference (CfD) documentation, capacity market discussions and regulatory impact assessments concerning installed or nameplate capacity. Do not confuse GW (power/capacity at a point in time) with GWh or MWh (energy over time), which are used for output, settlement and billing. For quick conversion: 1 GW = 1,000 MW = 1,000,000 kW = 10^9 W.
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NEWS
UK Private Client weekly round-up: wills execution, contentious probate, trust formalities, HMRC tax updates and avoidance, proprietary estoppel remedies, and Scottish Budget delay—week ending 9 October 2025

In this issue: Wills Probate Trusts UK taxes for Private Client HMRC Manuals updates Tax avoidance, evasion and non-compliance Contentious trusts and estates Scotland, Wales and Northern Ireland International Question of the week Daily and weekly news alerts LexTalk®Private Client: a Lexis+® community New and updated content Dates for your diary Trackers Latest Q&As Useful information Wills No line of sight—due execution and presence In the Estate of Kathleen Coady, District Judge Chloë Phillips delivered judgment in Coady v Coady PT-2023-BHM-000025 (Business & Property Courts in Birmingham (Probate)), addressing as a preliminary question whether a coronavirus (COVID-19) era ‘garden signing’ met section 9 of the Wills Act 1837. The court concluded it did not, rendering the 25 April 2020 Will invalid. Written by Charlotte John of Gatehouse Chambers. See News Analysis: No line of sight—due execution and presence In the Estate of Kathleen Coady. Probate...

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NEWS
UKFTT holds employee share scheme payments taxable as earnings; purported repayment via uncalled capital disregarded under Ramsay; full amounts subject to PAYE and NICs (GW Martin v HMRC)

FTT holds payments to employees under tax avoidance scheme were taxable earnings despite purported repayment obligation (GW Martin & Co Limited & another v HMRC) GW Martin & Co Ltd & another v The Commissioners for HMRC [2025] UKFTT 1147 (TC). The appellants transferred sums to employees on the basis that those employees would subscribe for a newly created class of shares in the appellants (the Shares). These Shares conferred no voting power, no dividend entitlement, and only very limited rights in the event of a winding up. The structure was intended to sidestep PAYE and NICs liabilities while also delivering a corporation tax deduction. The sums advanced were not loans; rather, they were conditional on staff taking up Shares with a nominal value mirroring the payments. Only 1% of that nominal amount was paid up, leaving the remaining 99% uncalled, so the cash flowed to employees while the issued share capital largely remained unpaid...

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NEWS
UK tax weekly update: key rulings on domicile, PAYE schemes, VAT partial exemption, SDLT/ATED; HMRC guidance changes; Scottish Budget date; corporate tax statistics; compliance developments (9 October 2025)

In this issue: Individuals and income tax Employment taxes Budgets and Finance Bills Companies and corporation tax International Tax compliance and administration Daily and weekly news alerts New and updated content Latest Q&A Dates for your diary Trackers Useful information Individuals and income tax High Court allows taxpayer to pursue judicial review regarding his historic domicile status (Aubrey Weis v HMRC). As noted in last week’s highlights, in Aubrey Weis v HMRC [2025] EWHC 2479 (Admin), the High Court accepted the claimant’s request to extend the deadline for issuing judicial review proceedings against HMRC and approved permission for the matter to go forward to a full hearing. The case turns on the taxpayer’s historic domicile and whether he held a legitimate expectation that HMRC would treat him as non-UK domiciled, so that his overseas income and gains would be assessed on the remittance basis. See News Analysis: High Court permits taxpayer to...

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PRACTICE NOTES
Nuclear energy: overview of industry and regulatory bodies, licences, electricity market codes, key guidance, and energy code governance reforms

Industry bodies Body Description The ESC serves as the Capacity Market Settlement Body, overseeing the distribution of capacity payments and the collection of penalties from recipients supported by the Capacity Market. It acts as the Capacity Market ‘Settlement Body’. It also manages, in that capacity, the sums received from licensed electricity suppliers that finance the payments the ESC makes to those Capacity Market beneficiaries. Those supplier receipts underpin the ESC’s outgoing payments. The ESC was designated under the Electricity Capacity Regulations 2014, SI 2014/2043, reg 80, and is a company wholly owned by DESNZ. Its relationship with its sole shareholder—the Secretary of State for Energy Security and Net Zero (SoS)—is set out in a Framework Document. Operationally, ESC shares premises, a website and senior leadership with the Low Carbon Contracts Company Ltd (LCCC), the counterparty for the low carbon Contract for Difference (CfD) scheme. Further detail on LCCC appears in Practice Note: Industry Bodies and Codes—Renewable Energy. Great British Energy—Nuclear is an arm’s-length body tasked with delivering the...

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PRACTICE NOTES
UK Offshore Wind Project Finance: Consents, OFTO and Grid, Procurement and O&M, Offtake and CfDs, Financing Documents, Security and Key Risks

Introduction An offshore wind farm is a generating plant comprising all the infrastructure needed to capture and gather wind energy, convert it into electricity, and securely deliver it to the main power network or a nearby local grid as required. Offshore wind is gaining prominence as a renewable solution to address climate change, with the UK and Europe leading globally in the development of large-scale offshore wind farms today. Though the recent gas shortages and spells of low wind in Europe have revealed the fragilities of relying on offshore wind for energy security, it unquestionably remains a crucial and growing share of the global energy mix, bolstered by rapid expansion in China. In recent years, the European offshore wind industry has flourished, most notably in the UK, which ranks among the largest markets and hosts several of the biggest operational offshore wind projects anywhere today. The UK’s objective is 50 GW of offshore wind by 2030, of which 5 GW is planned to utilise floating technology. By 2025, around...

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PRACTICE NOTES
Onshore Wind Project Finance: A Lawyers’ Guide to Structure, Offtake (CfDs and PPAs), Construction Interfaces, O&M, Risk Allocation, Insurance, Curtailment, Repowering and Decommissioning

Introduction Wind energy has been pivotal in driving the shift in generation from fossil fuels to renewables. Among renewable technologies, onshore wind is generally inexpensive and its costs have fallen sharply over the last decade; a recent International Renewable Energy Agency (IRENA) analysis indicates the levelised cost of onshore wind power dropped by 69% between 2010 and 2022. In contrast with offshore turbines, which contend with stronger winds and need underwater installation and maintenance, onshore turbines are regarded as relatively low-tech and straightforward to set up. As a result, onshore wind is among the most widely deployed renewable options, supported by a mature global market that in 2023 surpassed 940 GW of capacity across developed and developing nations on five continents. By comparison, offshore wind — with just 72 GW across three continents — is far smaller than the more advanced onshore segment. Despite the onshore market’s size and maturity, rollout remains robust, with more than 105 GW added in 2023 versus 54 GW in 2019. In 2023, onshore...

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