According to a report by European Union, 2018, sector coupling 'referred primarily to the electrification of end-use sectors like heating and transport, with the aim of increasing the share of renewable energy in these sectors (on the assumption that the electricity supply is, or can be, largely renewable) and providing balancing services to the power sector. More recently, the concept of sector coupling has broadened to include supply-side sector coupling. Supply-side integration focuses on the integration of the power and gas sectors, through technologies such as power-to-gas. The European Commission also uses this broader notion of sector coupling and understands it as a strategy to provide greater flexibility to the energy system so that decarbonisation can be achieved in a more cost-effective way'.
Read more regarding the EU report: