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At the University of Liverpool, the self-developed software powers down around 3,500 participating computers that are idle, typically for over 10 hours daily, bringing a number of benefits. The annual savings of CO2 emissions and electricity costs are over 500 tonnes and £64,000, respectively. Moreover, the walk up centres do not overheat as they previously did. The system has an opt-out mechanism for computers which legitimately must not be shut down (e.g. workstations acting as servers).
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