We like the Raspberry Pi because it is a do-it-yourself device that will encourage people to have a go. We like it because it is British. We like it because it uses open source. But we just found a new reason to like the £22 computing device. We like it because it is green. We don’t mean that the thing itself will save electricity – although there are projects you could do with a Raspberry Pi that might cut your electricity bills by automating your house. No, the Pi is green because it could be the vanguard for the next wave of higher efficiency in our data centres.