Because you need workers
You build a nuclear power plant on the middle on nowhere. Are your workers going to commute hundreds of miles per day? No. So you build houses for them close to their place of work. Your workers have families, so you build schools. Your families need to buy stuff, so you build shops. People need leisure activities, so you build those. The infrastructure grows and grows.
Congratulations, your power plant is right next to a city. A city that you built right next to the power plant, the power plant that was built in the middle of nowhere.
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