2.4

1. Solar energy   

 2. Wind energy   

 3. Biomass (BM) energy  and financing of renewables 

4. Hydrogen as a seeming fuel (= only a type of energy storage) 

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Sources: 

1. _{https://www.sciencedirect.com/science/article/pii/S0360544221007167}
2. _{https://link.springer.com/article/10.1007/s10098-020-01939-3, graphic abstract}
3. _{https://en.wikipedia.org/wiki/Renewable_energy_in_the_Netherlands#/media/File:RenewableEnergyNL.svg: By KarlFrei - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=86417363
   https://unstats.un.org/sdgs/report/2019/goal-07/}
4. _{https://www.theworldofhydrogen.com/gasunie/supply-and-demand/, Source: Gasunie pitch for the ‘Electricity Table’, based on ECN 2017}