Rick Scarlet and Gloria Johnson paid their electric bill last month, just like most people. It was $3.35. That took care of heating the couple's energy-efficient Springfield home and charging their electric car using solar power. The key is solar panels that went up behind their home in 2009. The system is tied into the power grid. When their system generates surplus power -- more than they use -- Scarlet and Johnson receive credit on their electric bill. When they use more than they generate,... Continuar leyendo