Green and Pink hydrogen:
The carbon intensity of Green hydrogen is closely related to the carbon intensity of the electricity used. Wind or solar power are low carbon sources. The UK has access to onshore and offshore sources [11] and the supply has increased significantly over recent decades. Hydroelectricity and electricity from biomass also form part of the mix of low carbon electricity. Pink Hydrogen has a very similar production pathway to Green Hydrogen, in that it is produced from the electrolysis of water, but uses low carbon electricity from nuclear sources. Electrolysers use the low carbon electricity to convert water into hydrogen and oxygen. The electrolysers can range in size from small, appliance-size equipment that is well-suited for small-scale distributed hydrogen production to large-scale, central production facilities [13]. The development of Electrolyser technology continues at pace during the energy transition.
Renewables made up the following percentages of the UK electricity supply (Q4 2021) [12]
15
10
5
0
Percentage UK energy Supply Q4 2021
Types of electrolysers: A number of technologies are available for electrolysers, with different operating conditions and efficiencies. Polymer Electrolyte Membrane (PEM) Electrolysers [14] [15] Alkaline Electrolysers [16] Solid Oxide Electrolysers [17]
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