Various meanings of the term free energy include:

• The term thermodynamic free energy denotes the total amount of energy in a physical system which can be converted to do work.
  • Helmholtz free energy: the amount of thermodynamic energy which can be converted into work at constant temperature and volume. In chemistry, this quantity is called work content.
  • Gibbs free energy: the amount of thermodynamic energy in a fluid system which can be converted into work at constant temperature and pressure. This is the most relevant state function for chemical reactions in open containers.

  In engineering fields related to power generation, free energy means an energy source available directly from the greater environment and which cannot be expected to be depletable by humans. Free energy in this sense may be categorised as renewable energy, although most renewable energy sources would not normally be called free energy sources.

  • Free energy is energy which may be directly utilized (and returned) by a device from the surroundings (electromagnetic free energy is sometimes referred to as radiant energy).
  • Free energy can also mean a primary energy source that is free (i.e. does not cost anything) for consumption. Examples include wind power, earth batteries, water power, and solar power. Remaining so-far-unexploited forces of nature which are well documented in scientific literature include atmospheric electricity, and atmospheric pressure change.

• Free energy can mean more fantastical forces attributed by fewer qualified scientists and engineers, and are generally considered Perpetual motion. These devices utilize telluric currents, quantum vacuum perturbation (which cannot really be considered to be a force as much as it is a bending of time-space), quantum vacuum energy, rotating magnets (employed in ways hitherto unpracticed), as well as some purported methods to crack hydrogen.

• Free energy suppression is the notion that corporate energy interests deliberately suppress technologies that may provide energy at very little cost.

A device which collects energy at zero cost

Free Energy Wikipedia

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Alternative Energy

Alternative energy is an umbrella term that refers to any source of usable energy intended to replace fuel sources without the undesired consequences of the replaced fuels. Typically, official uses of the term, such as qualification for governmental incentives, exclude fossil fuels and nuclear energy whose undesired consequences are high carbon dioxide emissions, the major contributing factor of global warming according to the Intergovernmental Panel on Climate Change, and difficulties of radioactive waste disposal. Over the years, the nature of what was regarded alternative energy sources has changed considerably, and today because of the variety of energy choices and differing goals of their advocates, defining some energy types as "alternative" is highly controversial.

The term "alternative" presupposes a set of undesirable energy technologies against which "alternative energies" are opposed. As such, the list of energy technologies excluded is an indicator of what problems that the alternative technologies are intended to address. Controversies regarding dominant forms of energy and their alternatives have a long history.

Alternative Energy Wikipedia

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In the News ...

'Blue energy' seems feasible and offers considerable benefits   PhysOrg - October 30, 2009
Generating energy on a large scale by mixing salt and fresh water is both technically possible and practical. The worldwide potential for this clean form of energy - 'blue energy' or 'blue electricity' - is enormous.

Powering a Green Planet: Sustainable Energy, Made Interactive   Scientific American - October 27, 2009

  'Smart Grid' Gets $3.4 Billion Jolt   Live Science - October 27, 2009

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