If the power goes out in your neighbourhood, you may have to rely on solar power to get by and communicate with these gadgets ...

Concentrated solar power was one of several technologies that showed promise. Ivanpah's main buyer is pulling out to save customers money.

This is roughly what system size you need. For example, if your home used 30,000 kWh last year, you would need a 25-kW system. Solar panels are designed to last 25 to 30 years, and your roof needs ...