The Scottish Government’s energy strategy sets out two extremely different scenarios for the energy system. One scenario primarily involves electrification and using electricity, with either ground-source or air-source heat pumps being used in buildings. The other scenario involves hydrogen, which, primarily, would be produced from natural gas, with the carbon sequestered. Those are the two options. Under the electrification scenario, there would be much less fossil-fuel use, although I do not think that it would be entirely ruled out. The primary energy supply would come from electricity.
Clearly, those are two extreme examples. On which scenario is better, our view is that the answer probably lies somewhere in the middle. We have some concerns regarding hydrogen. As we have heard, there is an awful lot of additional work to be done in putting the various bits together, demonstrating the full chain and rolling it out—it is quite a big infrastructure project. Our concern is that we do not want that work to distract from building on the technologies that we have today.
For example, there is arguably still quite a lot that could be done with heat pumps to help to grow the market as we have grown the wind turbines market. We have provided confidence by saying that we will do it at volume, which has allowed supply chains to grow and get cheaper.
We have not done that with electric heat; we are only beginning that work. Things are getting much better, because the grid has decarbonised. Five years ago, a heat pump produced roughly the same emissions as those from a gas boiler. Today, thanks to the rapid decarbonisation of the electricity grid, a heat pump produces something like 25 to 30 per cent of the emissions from a gas boiler. Therefore, such pumps have become a true source of low-carbon heat. We still need to do more to help the sector by rolling out the technology and working out some of the issues.
The same goes for district heat networks, which is another technology that we could roll out in the near term. The networks are large pipes in the ground through which we pipe to buildings the heat that is generated in power stations. They could take large-scale heat pumps, perhaps by drawing on energy from rivers or the air. Again, that is a technology that is tried and trusted, and we do not want the focus on longer-term infrastructure, such as that for hydrogen, to detract from the nearer-term technologies that we can use.