Island of Ireland Single Electricity Market (SEM)—an introduction


Produced in partnership with Evie Doherty and Conall Bolger of Cornwall Insight
Practice notes

Island of Ireland Single Electricity Market (SEM)—an introduction


Produced in partnership with Evie Doherty and Conall Bolger of Cornwall Insight

Practice notes
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Brexit impact

11 pm (GMT) on 31 December 2020 marked the end of the Brexit transition/Implementation period entered into following the UK’s withdrawal from the EU. At this point in time (referred to in UK law as ‘IP completion day’), key transitional arrangements came to an end and significant changes began to take effect across the UK’s legal regime. Any changes relevant to this content will be set out below.

Upon IP completion day, the European Union (Withdrawal) Act 2018 (EU(W)A 2018) created a new category of domestic UK law—retained EU Law (REUL)—made up of EU-derived rights and legislation that were preserved in the UK following Brexit. On 29 June 2023, the Retained EU Law (Revocation and Reform) Act 2023 (REUL(RR)A 2023) gained Royal Assent. REUL(RR)A 2023 reforms the treatment of REUL by: 

  1. •

    revoking substantial amounts of REUL from 31 December 2023

  2. •

    re-labelling REUL as ‘assimilated law’ from 1 January 2024

  3. •

    creating new powers in relation to assimilated law

The re-categorisation of REUL (and associated

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United Kingdom
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Key definition:
Brexit definition
What does Brexit mean?

means: (a) the United Kingdom (UK) ceasing to be a member state of the European Union (EU) and/or the European Economic Area (EEA) on exit day; and/or (b) the commencement, end of[ or variation in] any transitional, trading or other arrangements from time to time between: (i) the UK and the EU and/or EEA (including during any implementation period and IP Completion Day); and/or (ii) the UK and any other country, group of countries, international organisation, bloc or body (including the World Trade Organization) in contemplation of or (directly or indirectly) in connection with the UK’s said cessation of membership;

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