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The mPower reactor would include independent "modular" units that could be manufactured on an assembly line, thus cutting manufacturing and construction costs, said John Fees, CEO of McDermott International, the parent company of Babcock & Wilcox. Units could be built and come online even as others are being built, he said, allowing power companies to start earning revenue faster. "This brings not only lower installation base cost but also brings greater cost certainty" compared to the $6 billion to $8 billion large-reactor option, Fees said. He declined to name a price for mPower, but said it would be "under the $5,000 per megawatt" price that the industry has estimated for large reactors.