How to get FREE Standard Shipping: Ship to an address within the United States (including U.S. territories) Place your online order of $25 or more* - after promotions and before tax are applied. Use Standard shipping option at checkout.
alternative energy-energy derived from sources that do not use up natural resources or harm the environment. energy, free energy - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; energy can take a wide variety of forms.
RENEWABLE ENERGY AND ALTERNATE ENERGY SOURCES. Renewable energy is sustainable as it is obtained from sources that are inexhaustible (unlike fossil fuels). Renewable energy sources include wind, solar, biomass, geothermal and hydro, all of which occur naturally.olar energy is a renewable free source of energy that is sustainable and totally inexhaustible, unlike fossil fuels that are finite. It is also a non-polluting source of energy and it does not emit any greenhouse gases when producing electricity.