Renewable energy (sources) or RES capture their energy from existing flows of energy, from on-going natural processes, such as sunshine, wind, wave power, flowing water (hydropower), biological processes such as anaerobic digestion, and geothermal heat flow.
The most common definition is that renewable energy is from an energy resource that is replaced by a natural process at a rate that is equal to or faster than the rate at which that resource is being consumed. Renewable energy is a subset of sustainable energy.
From Nordic Folkecenter for Renewable Energy. (n.d.). http://www.folkecenter.net/gb/overview/definitions/
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Interdisciplinarity in Engineering
International Journal of Renewable Energy Research
Journal of Natural Resources and Development
Journal of Power Technologies
Journal of Renewable and Sustainable Energy
Journal of Sustainable Energy
Materials for Renewable and Sustainable Energy
Mechatronics, Electrical Power, and Vehicular Technology
These are a sampling of eBooks available from the library.