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New nuclear plant designs, called small modular reactors, could speed deployment of carbon-free power in the future as electricity demand rises.

These small reactors would have simpler designs, making them easier and cheaper to build than current plants.

But the cost of building a first-of-its kind project has been a hurdle to commercializing the technology in the U.S.

Several power companies are looking at upgrading existing plants with these smaller reactors.