content: The publishers have found a unique way to make money - they take something that was produced by the government, slap a price on it and ship it out. If I had done more careful research, I would have realized that this product was available on the web at the National Renewable Energy Laboratory web site. In fact, an updated version is available for download.The work itself provides a general overview of various technologies, along with the developments and projections as to how that technology might be deployed in the future. It may be influenced by the priorities of the administration in power - this version gives a lot of play to the "hydrogen economy" that the administration is pushing.