How To Encourage Office Staff To Switch Off Electrical Equipment Before They Go Home

How can office staff be encouraged to switch off electrical equipment before they go home?

Before staff go home they can be encouraged to switch off electrical equipment. For example, they can be sent an electronic memo that reminds you to switch off, or there can be competitions to see at the end of the week, who's left their monitor, or their PC on. And, anonymously, that can be fed back to people at staff meetings.