If you look at my previous post above about my solar system that NJ paid for almost 65% of the cost, I was only able to get that rebate by having my system connected to the grid which means anything that is generated that I am not using at that moment goes directly into the grid to all my neighbors. Since I keep detailed stats on everything, I can tell you, depending on the month, I put roughly anywhere from 25%-60% of the electricity I generate back into the grid. June through August are the months i put little back into the grid because of air conditioning and the pool pump. If you want to look at my yearly totals, in 2007 I generated about 9590kW and put 3670kW back into the grid which is about 39% to my neighbors. For 2008 I generated about 9596kW and put 4010kW back into the grid which is about 42%. You will notice that I had a 3% increase back to the grid due to me starting to become more energy conscience. I know I probably use more electricity than I should, but I have been trying to make more of an effort to reduce my carbon footprint and not just with electricity. While its not 50% (or 65% in my case), I am still putting a decent amount back into the grid. So anyone claiming that its rare a house generates more than it consumes is probably false. You have to remember that its only the electricity the house uses during the day that will come from the electricity generated by the panels. Anything used at night comes from the grid. Most people are not home during the day which means less electricity is used during the day because tv's, stereos, appliances, possibly computers and whatever else that someone would use while home that consumes electricity are turned off, which means more electricity back into the grid. Lights which are also another electricity hog (unless you are using compact florescent) are mostly used at night so none of that comes directly from the panels.