I've looked at the book, there's when I checked his figures and they seemed to disagree with reality.

So, electricity is about 1/3 of total energy. The 15% figure is the latest one for the last quarter of 2013[1] (PDF, see page 13). That means that (according to Prof Mackay) 5% of the UK is covered in renewable electricity generation.

No, it's still not.

[1]https://www.gov.uk/government/uploads/system/uploads/attachm...