(2)The total energy use accounts for approximately 75 % of direct greenhouse gas emissions in the Union. Thus, the energy sector has a crucial role in continuing to reduce greenhouse gas emissions. The technical screening criteria laid down in Delegated Regulation (EU) 2021/2139 therefore cover a wide range of economic sectors and activities related to the energy supply chain, ranging from electricity or heat generation from different sources, through transmission and distribution networks to storage, as well as heat pumps and the manufacture of biogas and biofuels. However, Delegated Regulation (EU) 2021/2139 does not contain technical screening criteria for economic activities in the fossil gas and nuclear energy sectors, despite their potential to contribute to the decarbonisation of the Union’s economy.