First Law of Thermodynamics: Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.
Kinds of renewable or alternative energy sources that can be enabled include natural energy (e.g. collected via solar-thermal collectors, or dry cooling towers used to collect winter's cold), waste energy (e.g. from HVAC equipment, industrial processes or power plants), or surplus energy (e.g. as seasonally from sunny power)
As mentioned above, energy cannot be recycled, and it is not recycled in an ecosystem. On the contrary, it flows in and out of the ecosystem. But the matter does recycle in the biosphere, and it is here that matter and energy move very differently.
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