It sounds boring, but Sustainable Energy: Without the Hot Air by David J C MacKay is a must-read. In it, he assesses various possible futures for energy supply in the UK after fossil fuels have finished. The key thing that makes this book stand out is that he uses simple methods to calculate the available energy resources in each sector.
So whether you think nuclear or wind is the future, he comes up with the numbers.
He is a Professor in the Physics Department at Cambridge University. He tries not to state his preferred future option, but I think you may detect slight bias in places!
I ordered a copy from Wigton Library (they had to get a copy sent up from Kendal!) but it will be in the school library soon. However, if you want it for free, you can download it from www.withouthotair.com
It will make you a better physicist.
