In the 1980s, leading consultants were skeptical about cellular phones. McKinsey & Company noted that the handsets were heavy, batteries didn’t last long, coverage was patchy, and the cost per minute was exorbitant. It predicted that in 20 years the total market size would be about 900,000 units, and advised AT&T to pull out. McKinsey was wrong, of course. There were more than 100 million cellular phones in use in 2000; there are billions now. Costs have fallen so far that even the poor — all over world — can afford a cellular phone.
A new generation of solar panels made from a mineral called perovskite has the potential to convert solar energy into household electricity more cheaply than ever before, according to a study from Briain’s Exeter University.
Super-thin, custom-colored panels attached to a building’s windows may become a “holy grail” for India and African countries, Senthilarasu Sundaram, one of the authors of the study, told the Thomson Reuters Foundation.
“In those countries these types of material will be like a holy grail: they can both shade windows … and at the same time produce electricity,” he said.
If you are reading this, you are probably mulling over a decision to stop paying for electricity and contemplating finally going solar. When you decide to go solar, you can choose where to install your photovoltaic (PV) panels.
Depending on your townships zoning and ordinances, you may be able to determine where to put your panels, either:
On top of your property (i.e. rooftop installation)
In the front, side, or back yard (i.e. ground-mounted installation)
But between rooftop and ground-mounted solar, which option is best? And, which option is best for you.