Meeting of the Parliament 01 May 2025
If I understand the argument correctly, that still depends on the development and efficiency of carbon capture and storage, which has yet to be proven and will always add additional cost.
Green hydrogen is where Scotland has a massive advantage. The potential scale of renewables generation in Scotland is immense, and if we develop that potential fully, we will be producing far more electricity than we need or can export through transmission infrastructure, which means that the production of hydrogen is an obvious opportunity.
Where hydrogen comes from is not the end of the story. We also need to address how it is used. There are still those who cling to the idea that we can simply inject hydrogen into existing energy systems, whether that is the gas grid for heating or transport systems to displace fossil fuels, but there are some fundamental limits that we need to address.
We can generate renewable electricity and use it to produce hydrogen. The hydrogen can then be stored, transported to where it is needed and turned back into useful energy, but at every step in that journey, efficiency is lost, so we end up with less useful energy at the end of the process than was generated at the start. Any use case in which direct electrification can be achieved will always be the better choice when compared with hydrogen, not only with today’s technology, but under the laws of physics.
That argument is only stronger for heat, because the technology that some countries have been deploying at scale for decades, and with which Scotland is struggling to catch up, goes far beyond even the theoretical limit of the 100 per cent efficiency that a closed system can reach. Heat pumps do not turn electricity into heat, but rather use electricity to gather heat from the ambient environment. They can produce up to three or four times as much heat output from the electrical input that they run on. Hydrogen can never do that, yet the Scottish Government continues to promote the notion of hydrogen for domestic heating.