Computers, like most electronics, consume a small amount of energy even when switched off because of losses in the transformer or sensors that remain active for functions such as remote power-on. For a PC, the consumption when powered off is typically between 1 and 4 watts, said Fujitsu Siemens. The best that energy-conscious users can do is keep electronics on a power strip that they must remember to turn off.
The Esprimo 7935 packs a system that achieves zero consumption without pulling the plug, said Lothar Lechtenberg, a company spokesman.
Businesses with a lot of computers stand to save a significant amount of money each year by ensuring that their PCs aren't consuming power overnight, but there are disadvantages. Many companies administer software updates overnight, and having the machines unplugged means that wouldn't be possible.
Fujitsu Siemens said it has solved this problem by allowing the machines to be awake and consuming a very small amount of power during a predefined time slot during which updates can take place. Once the time slot passes, the machine returns to zero-watt mode until it is switched on by its user.
Other green credentials of the new computer include a power supply that is 89% efficient, which means less electricity is wasted through heat, and motherboards with no halogen or lead. The PC conforms to the U.S. Environmental Protection Agency's Energy Star 5.0 standard, which will come into use in the middle of this year, and the German Blue Angel mark.
The machine is likely to cost between $757 and $883 (€600 or €700). Availability outside of Fujitsu Siemens' Europe, the Middle East and Africa sales area was not announced.
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