David MacKay has done some great work, but I feel I need to present some of the criticism he has received, for balance. In particular, there is a perception that he is biased towards nuclear energy (understating its drawbacks, while also being unnecessarily dismissive of renewables).
People can consider these articles for themselves:
https://www.thetimes.co.uk/article/professor-david-mackay-br...
"Professor David MacKay: Britain ‘must go nuclear’ to control climate"
https://www.theguardian.com/environment/2016/may/03/idea-of-...
"Idea of renewables powering UK is an 'appalling delusion' – David MacKay"
The latter, from 2016, includes the line:
"There is this appalling delusion that people have that we can take this thing that is currently producing 1% of our electricity and we can just scale it up..."
For reference, according to:
https://www.independent.co.uk/environment/wind-solar-overtak...
"Renewables’ share of electricity generation shot up to 29 per cent, while nuclear sources accounted for around 21 per cent."