2020ok.com offers free e-books on renewable energy for online reading and/or download. Book titles include:
- Thermal Energy, Fall 2002
- Sustainable Energy, Spring 2005
- Photovoltaic Solar Energy Systems
- Fundamentals of Advanced Energy Conversion
- Advanced Power Sources for Space Missions
PDFee.com presents a free PDF book for download, Renewable Energy: Hydropower. Historical Water has always been one of mankind’s most vital resources. While the human body can go weeks without food, it can only survive for a couple of days without water consumption. Crops in the field will shrivel and die without a readily available supply. We use it for cleaning; we use it for cooking. And since almost the start of recorded history, we have used it as an energy source.
There are free PDF books for download at PDF-WORD.net. Articles include: