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.

Perpetual motion Wikipedia

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

The Bloom Energy Server is a solid oxide fuel cell made by Bloom Energy that uses liquid or gaseous hydrocarbons (such as gasoline, diesel or propane produced from fossil or bio sources) to generate electricity on the site where it will be used, and it is at least as efficient as a traditional large-scale coal power station. According to the company, a single cell (one 100mm X 100mm metal alloy plate between two ceramic layers) generates 25 watts.

The Bloom Energy Server uses thin white ceramic plates (100mm X 100mm) which are made by baking common beach sand, and each ceramic plate is coated with a "secret" green ink (anode) on one side and another secret black ink (cathode) on the other side.

According to the San Jose Mercury News, "Bloom's secret technology apparently lies in the proprietary green ink that acts as the anode and the black ink that acts as the cathode." Wired reports that the secret ingredient may be yttria-stabilized zirconia based upon a 2006 patent filing (7,572,530) that was granted to Bloom in 2009. To save money the Bloom Energy Server uses inexpensive metal alloy plates as a fast ion conductor between the two ceramic plates, instead of platinum.

According to the board of Bloom Energy, the technology works. A Guardian report on the story added, "But industry watchers say they remain unsure exactly how it works."

Bloom Energy Server   Wikipedia

Video: Q&A With Bloom Energy¹s Founder, Next Gen Fuel Cells and More   Wired - February 25, 2010

'Bloom Box' Fuel Cells a Revolution in Energy Technology   Epoch Times- February 25, 2010

  Bloom Energy Server   Google Videos

Nuclear fusion is the future   Telegraph.co.uk - December 8, 2009

Blog: Hot, medium and cool fusion   MSNBC - December 4, 2009

Next-generation solar cells get boost   ABC.au - December 2, 2009

Solar Power from Your Windows, Awnings, Even Clothing?   Science Daily - November 30, 2009

'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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