Document Generated: 2022-06-22 Status: This is the original version (as it was originally made). (aa) was converted from electricity, and (bb) is stored for the purpose of its future reconversion into electricity; (j) “supply” has the meaning given by Article 2(19) of the Electricity Directive; (k) “transmission” has the meaning given by Article 2(3) of the Electricity Directive; and (l) “transmission system operator” has the meaning given by Article 2(4) of the Electricity Directive. The oil subsector 2.—(1) This paragraph describes the threshold requirements which apply to specified kinds of essential services in the oil subsector. (2) For the essential service of the conveyance of oil through relevant upstream petroleum pipelines, the threshold requirement, in the United Kingdom is the operator of a relevant upstream petroleum pipeline which has a throughput of more than 3,000,000 tonnes of oil equivalent per year excluding natural gas, if that operator does not fall within another threshold requirement in relation to this pipeline under this Schedule. (3) For the essential service of oil transmission by pipeline, the threshold requirements are— (a) in Great Britain, operators of any pipeline with throughput capacity of more than 500,000 tonnes of crude oil based fuel per year; and (b) in Northern Ireland, operators of any pipeline with throughput capacity of more than 50,000 tonnes of crude oil based fuel per year. (4) For the essential service of the operation of relevant oil processing facilities, the threshold requirement in the United Kingdom is in the case of— (a) a relevant oil processing facility, or (b) a relevant upstream petroleum pipeline which is connected to and operated from a relevant oil processing facility, an operator of a facility or pipeline with a throughput of more than 3,000,000 tonnes of oil equivalent per year. (5) For the essential service of oil production, refining, treatment, storage and transmission the threshold requirements are— (a) in Great Britain, operators of any facility where that facility has a capacity greater than any of the following values— (i) storage of 500,000 tonnes of crude oil based fuel; (ii) production of 500,000 tonnes of crude oil based fuel per year; or (iii) supply of 500,000 tonnes of crude oil based fuel per year; (b) in Northern Ireland, the operator of a facility which has a storage capacity of greater than 50,000 tonnes of crude oil based fuel. (6) For the essential service of the operation of petroleum production projects (other than projects which are primarily used for the storage of gas), the threshold requirement in the United Kingdom is, in the case of— (i) a relevant offshore installation which is part of a petroleum production project (other than a project which is primarily used for the storage of gas), or (ii) a relevant upstream petroleum pipeline which is connected to and operated from such an installation, 25