(4)In accordance with Article 10(2) of Regulation (EU) 2020/852 covering transitional economic activities, it is necessary to lay down technical screening criteria for electricity generation, high-efficiency co-generation of power and heat/cool, and production of heat/cool in efficient district heating and cooling systems from fossil gas, where greenhouse gas emissions from fossil gas are below an appropriate threshold. In addition, it is necessary to lay down technical screening criteria for the use of fossil gas in electricity generation, high-efficiency co-generation of power and heat/cool, and production of heat/cool in efficient district heating and cooling systems, where such electricity generation, high-efficiency co-generation of power and heat/cool, and production of heat/cool in efficient district heating and cooling systems do not yet comply with that appropriate threshold, as in addition to the use of climate-neutral energy and more investments in already low-carbon economic activities and sectors, the transition requires substantial reductions in greenhouse gas emissions in other economic activities and sectors for which there are no technologically and economically feasible low-carbon alternatives. All those economic activities should be qualified as transitional under Article 10(2) of Regulation (EU) 2020/852, given that technologically and economically feasible low-carbon alternatives may not yet be commercially available at a sufficient scale to cover the energy demand in a continuous and reliable manner. In particular, for electricity generation, it is appropriate to provide for an alternative approach to directly limiting the greenhouse gas emissions. Under this alternative approach, that should deliver similar results over a 20 years period, facilities may reach such results by limiting the number of hours in operation or by advancing the switch to renewable or low-carbon gases to an earlier date. The technical screening criteria should facilitate an accelerated phase-out from more emissions-intensive energy sources, including solid fossil fuels. In addition, in order to fulfil the requirements laid down in Article 10(2), first subparagraph, points (a), (b) and (c), of Regulation (EU) 2020/852, the technical screening criteria for the use of fossil gas should also ensure that robust evidence is available to demonstrate that the same energy capacity cannot be generated with renewable sources, and that effective plans are put in place for each facility, in line with the best performance in the sector, to switch entirely to renewables or low carbon gases by a specific date. Finally, the technical screening criteria should provide for a time-limited recognition of the contribution of those activities to decarbonisation.