The technology is currently capable menransfer 5 watts of power via USB. Therefore we so often see used as a means of USB mobile phone charger or iPod postscript energy consumption is not too large.
Recently emerged a USB charger device models from a company called USB promoters Group. It's a design that they offer have not reached the final stage. But that certainly, if their design is complete, these technologies will be able to menransfer energy through a USB port 2.0 and 3.0 up to 100 watts.