E19/238 Solar Panel by Sunpower
We've been waiting for a breakthrough in residential solar, and here it is. These panels convert up to 19½
percent of the sunlight they receive into electric power, far more than any other panels. Specially shaped solar cells that occupy 3 percent more surface area than standard cells deliver up to 238 watts per panel.
About $15,000 for a 2.5-kilowatt system (sans subsidies); sunpowercorp.com