When temperatures in the San Francisco Bay Area soared over 100 degrees in May of 2008, Sunnyvale homeowner Larry Bunka didn’t sweat over turning on his central air conditioning. The Hewlett-Packard (HP) employee had just seen the impact his new SunPower residential system had made on his electric bill: In their first month of generating clean solar electricity, the Bunka family had reduced their bill down to $12, the price PG&E charges for the monthly rental of a meter. SunPower was able to completely offset the family’s electricity demands. Bunka says his meter now runs backwards during daylight hours, sending a surplus of electricity back to the grid – which is great news for this forward-thinking family.