I read this book cover-to-cover over the course of a couple of weeks. I'm new to the field of renewable energy, so you'll have to take my criticisms for what they are, a critique of the writing:
1) The author frequently repeats himself, and sometimes goes so far to state that he is repeating himself, and that the reader should refer back to a previous section.
2) Many of the references are "so and so claims such and such" or references to the Home Power magazine. It's great that the author cites his sources, but it often left me wondering if the author placed any stock in the claim being reported.
3) The author frequently refers to his own house, which was designed from the ground up to use renewable energy. While this is neat, it doesn't seem applicable to readers who already own houses (with a 99% chance that they're not nearly as efficient, and that it's not possible to convert them).
4) I would have enjoyed more information on solar power, since it seems to be the most applicable in urban and suburban areas. Instead, it received basically equal treatment alongside micro-hydroelectric and wind power.
Still, it's a good book - 3.5 stars - and contains a number of references to other sources of information on the topic.