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Solar power is the king of modularity. It is also the lowest-risk project type of any I’ve tested in terms of cost and schedule. That’s no coincidence. Wind power? Also extremely modular. Modern windmills consist of four basic factory-built elements assembled on-site: a base, a tower, the “head” (nacelle) that houses the generator, and the blades that spin. Snap them together, and you have one windmill. Repeat this process again and again, and you have a wind farm. Fossil thermal power? Look inside a coal-burning power plant, say, and you’ll find that they’re pretty simple, consisting of a few basic factory-built elements assembled to make a big pot of water boil and run a turbine. They’re modular, much as a modern truck is modular. The same goes for oil- and gas-fired plants. Electricity transmission? Parts made in a factory are assembled into a tower, and factory-made wires are strung along them. Repeat. Or manufactured cables are dug into the ground, section by section. Repeat again.
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Bent Flyvbjerg (How Big Things Get Done: The Surprising Factors That Determine the Fate of Every Project, from Home Renovations to Space Exploration and Everything In Between)