In the litany of failed technologies introduced by industry leaders, Sony’s Betamax—a videotape technology superior to its rival, VHS—probably leads the 20th century list.

Topping the 19th century list is Edison’s direct current (DC) electric transmission. At low levels, Westinghouse’s alternating current (AC) seemed a more efficient, safer means of transmitting power locally.

It may be that Edison had it right. DC allows transmission across greater distances with less power loss than AC. That may be crucial in bringing more wind and solar power on line. Suitable sites for wind and solar farms tend to be far away from the cities they’d supply. So says the July 26 Economist.

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