Computer systems use up a lot of electricity to run and almost as much electricity again to keep them cool. For example, in the USA, computers use about 1% of all the country's electricity.
Therefore, computer system vendors now design equipment that use as little energy as possible.
Here are some of the methods they offer
Sleep and hibernation modes
For much of the day, many computer systems lie idle. Sophisticated sleep and hibernation modes effectively shut down the computer if it has been unused for a while.
Real, physical servers are now so powerful that they spend much of their time doing…