Elon Musk says Tesla’s solar roof will be cheaper than ordinary roofs. He also says the energy-generating roofs will last longer than typical roofs, so, said the real-life Iron Man, “Why would you get anything else?”

At first Tesla solar roofs will be a premium product, according to Bloomberg, as the company’s slate and terra cotta tiles are 20 times more expensive than asphalt singles. But that factor could become irrelevant because of reduced shipping costs. It’s expensive to ship ...

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