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 traditional roof tiles because they’re so heavy and fragile. Musk said Tesla’s solar tiles are easier to ship and weigh around a fifth of what regular tiles weigh.

Tesla’s tile roofs will be cheaper to both manufacture and install, according to Musk, and will provide savings to a homeowner even before energy bill savings. He said “Electricity is just a bonus.”

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