Raising capital isn't SolarCity's number one reason for borrowing.

Secret Service slipups, solar power and the death of Saturday morning cartoons.

Despite some failures, solar is growing into a big industry.

For firefighters, there can be too many solar panels on a roof. Fire officials and the solar industry are paying attention to the concern.

Rooftop solar installations cut into utilities' revenue, but still use their expensive grid and and rely on them for backup power.

Solar facilities like Ivanpah could be the future — or, they could be a footnote in the history of clean energy.

European — and some American manufacturers — believe Chinese solar panels are being sold for less than they cost to build. The European Commission is investigating, but now Germany is distancing itself from the "dumping" allegations.

The U.S. believes China is dumping solar panels at below-market prices in America and has hit back with a penalty of 31 percent. That tariff is surprisingly steep and many in China are not reacting well. Could they backfire?

The U.S. will impose new tariffs on cheap Chinese solar panels. The new duties will be low. Analysts say it's not likely to spark a trade war.