Good perspective, i had not thought about it but this situation can really alter the globalisation of energy resources and bring new airs of energy sovereignty (both in national and individual scale). It is interesting to see how a reduction of the emissions can be the outcome of isolating a fossil fuel producer.
I don't have a roof myself but your friends' page looks like offering a very complete and easy service, and exactly that, more professionals that make it easy is what is necessary for the solar revolution @cocacolaron is speaking about.