My wife and I are very concious of the energy we use to operate the Volt and try to keep our trips within the 40+ mile EV range whenever possible. We have also become very aware that charging the Volt from our solar panels only really works on sunny days. On cloudy or overcast days we often do not generate enough power to run our home, much less charge the vehicle, so we’re paying the utility 13 cent/kWh to charge it up. Being committed to a low carbon footprint we prefer to charge from solar. Now that we have passed the summer solstice our available solar energy is declining too. I am lobbying my wife to approve installing more solar panels on the house before the end of the year. So far fiscal prudence has sway!