Energy Cycles are a fundamental principle in permaculture. Market led food production is an unsustainable system advocating the use of fossil fuels. Permaculture food production reduces the need for marketing, sales and distribution costs.
Permaculture seeks to keep the energy flow within the system instead of allowing the waste products to go elsewhere. Kitchen waste, for example, can be composted instead of being thrown out to the general waste.
"Good design uses incoming natural energies with those generated on-site to ensure a complete energy cycle." Mollison and Slay.