Frankfurt 2007: Fiat/Microsoft announce Ecodrive data-logging software - Autoblog
While it isn't electricity it is in the spirit of quantitating resource consumption to motivate us to reduce our ecological footprint. This takes the toyota announcement of including the "eco" light whenever you are driving with low gas usage, to a new level of data. This system will enable you to log how you are driving and emissions and gas usage to a much higher level. Of course this may only appeal to people that are prone to read electrimetric, and the toyota eco button will probably have a much broader appeal.