How little is too little?

Just in - a monthly power bill from a family with teenage boys living an in a eHaus.  The TOTAL cost (ie: no gas or wood for a fire) of $30.40 for 23 days with a projected cost for the month of $40.96.  How unbelievable is that?!  That would be at least 1/4 of  your monthly power bill wouldn't you say?  We will be keeping a track on this and will update you as we move into the Winter season but it certainly reinforces our belief of the low running costs when you choose to build with eHaus.