Dr. Ciaran Byrne:

There are two elements to that, although I appreciate that they are blended.

If someone installs solar now, it will help with his or her electrical costs. We are in a crisis, so I take the Deputy's point in that regard and it is why we are looking at the issue. However, the fabric upgrade helps more in the longer term. It moves a home away from CO2 emissions and into renewables, decarbonising the home. These two elements – the shorter term and longer term – are blended together.