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<p>We have interpreted this question as referring to sulphur hexafluoride (SF6).</p><p>
</p><p>In the EU Fluorinated Greenhouse Gases Regulation (2014), equipment containing
sulphur hexafluoride (SF6) is subject to containment provisions, including leak checking
obligations, a requirement to repair any detected leakages without undue delay and
the need to use appropriately qualified personnel to perform these tasks. The Regulation
also prohibits the intentional release of F-gases into the atmosphere, where the release
is not technically necessary for the intended use.</p><p> </p><p>The EU F-gases Regulation
requires that the Commission publish a report by 1 July 2020, assessing whether cost-effective,
technically feasible, energy-efficient and reliable alternatives exist, which make
the replacement of SF6 possible in new medium-voltage secondary switchgear. It also
requires that a comprehensive review of the EU F-gas regulation, including a consultation
process, is published by December 2022.</p><p> </p><p>All requirements of the Regulation,
including the above, will be retained in UK law after EU exit.</p>
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