Jurisdiction(s):
United Kingdom

Key definition

NI definition

What does NI mean? NI is an abbreviation used in nuclear and energy legal practice to mean, depending on context, either nuclear island or the Nuclear Institute. Nuclear island: a descriptive industry term (not defined in statute or case law) for the safety‑related part of a nuclear power station—typically the reactor building, containment, and associated safety systems. It is widely used in EPC and O&M contracts, licensing, decommissioning scopes and technical schedules across England & Wales, Scotland and Northern Ireland; in Ireland the term is understood in cross‑border procurement and standards, although there are no operational nuclear power stations. Nuclear Institute: the UK professional body for...

Gas Shipper Obligation in Great Britain (with potential Northern Ireland extension): levy funding low carbon hydrogen—legal framework, administration, calculation, credit cover, exemptions and compliance

Published by a LexisNexis Energy expert

Practice notes

For a fuller analysis of regulation, consenting and incentivisation within the net zero energy shift under the laws of England and Wales, see: Collinson and Hockman on Energy Law: Regulating, Consenting and Incentivising the Energy Transition. The textbook offers detailed treatment of themes addressed in this Practice Note. This Practice Note outlines the proposed Gas Shipper Obligation (GSO), a Levy upon licensed gas shippers in Great Britain (GB). It describes the GSO and identifies its legal footing, geographical reach, admiNIstrator, the method of calculation and charging, credit support obligations, potential exemptions, and linkages with low carbon hydrogen production and blending. It highlights the principal policy developments informing the GSO’s design and considers practical consequences for market participants. It also signals where further guidance may emerge and how stakeholders might prepare.

What is the GSO?

The GSO is a proposed charge on licensed gas shippers (Gas Shippers) operating in GB. In time, the GSO could be broadened to cover Northern Ireland (NI) gas suppliers undertaking activities equivalent to shipping (Northern Ireland Gas Shippers) (see also ‘What is the territorial scope of the GSO?’ below). Further detail is set out below within the framework outlined herein in this Practice Note...

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Web page updated on 22/05/2026

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