2. For Article 2 (definitions) substitute—
In this Regulation—
“aggregation” means the function of combining multiple customer loads or generated electricity for sale, purchase or auction in any electricity market;
“capacity allocation” means the attribution of cross zonal capacity;
“customer” means a wholesale or final customer of electricity;
“demand response” means the change of electricity load by final customers from their normal or current consumption patterns in response to market signals, including in response to time-variable electricity prices or incentive payments, or in response to the acceptance of the final customer’s bid to sell demand reduction or increase at a price in an organised market as defined in point (4) of Article 2 of Commission Implementing Regulation (EU) No 1348/2014, whether alone or through aggregation;
“distribution” means the transport of electricity on high-voltage, medium-voltage and low-voltage distribution systems with a view to its delivery to customers, but does not include supply;
“distribution system operator” means a person responsible for operating, ensuring the maintenance of and, if necessary, developing the distribution system in a given area and, where applicable, its interconnections with other systems, and for ensuring the long-term ability of the system to meet reasonable demands for the distribution of electricity;
“electricity crisis” means a present or imminent situation in which there is a significant electricity shortage, as determined by the Secretary of State and described in the risk-preparedness plan, or in which it is impossible to supply electricity to customers;
“electricity undertaking” means a person who carries out at least one of the following functions—
generation;
transmission;
distribution;
aggregation;
demand response;
energy storage;
supply or purchase of electricity,
and who is responsible for the commercial, technical or maintenance tasks related to those functions but does not include final customers;
“energy storage” means, in relation to the electricity system, deferring the final use of electricity to a moment later than when it was generated, or the conversion of electrical energy into a form of energy which can be stored, the storing of such energy, and the subsequent reconversion of such energy into electrical energy or use as another energy carrier;
“final customer” means a customer purchasing electricity for the customer’s own use;
“generation” means the production of electricity;
“non-market-based measure” means any supply-side or demand-side measure that deviates from rules in relation to the electricity market in Great Britain or commercial agreements, the purpose of which is to mitigate an electricity crisis;
“producer” means a person who generates electricity;
“the regulatory authority” means the Gas and Electricity Markets Authority;
“security of electricity supply” means the ability of an electricity system to guarantee the supply of electricity to customers with a clearly established level of performance, as determined by the regulatory authority;
“supply” means the sale, including the resale, of electricity to customers;
“transmission” means the transport of electricity on the extra high-voltage and high-voltage interconnected system with a view to its delivery to final customers or to distributors, but does not include supply;
“transmission system operator” means a person who is designated as an electricity transmission operator under section 10H of the Electricity Act 1989;
“wholesale customer” means a person who purchases electricity for the purpose of resale.”