These Regulations implement Article 16 of Directive 2004/8/EC of the European Parliament and of the Council on the promotion of cogeneration based on a useful heat demand in the internal energy market and amending Directive 92/42/EEC (OJ L 52, 21.2.2004, p.50). That Article amended Article 3(1) of Council Directive 92/42/EEC on efficiency requirements for new hot-water boilers fired with liquid or gaseous fuels (OJ L 167, 22.6.1992, p.17) as last amended by Directive 93/68/EEC (OJ L 220, 30.8.1993, p.1). The cogeneration of electricity is more commonly referred to in the United Kingdom as electricity produced from combined heat and power.