Natural gas power plants are relatively modular, and we can chain together units to make a bigger power plant. There is no such equivalent modular unit for petr

Natural gas power plants are relatively modular, and we can chain together units to make a bigger power plant. There is no such equivalent modular unit for petroleum processing. Each plant is highly customised to deal with a specific mix of different kinds of input oil, and to deliver a specific mix of output petroleom products. They can be reconfigured within a narrow range, but they're not highly flexible.