Aerial view of the Diablo Canyon Nuclear

By: – Special to CNBC.com

Once touted as a successor, or at least a competitor, to carbon-based power, the nuclear sector has taken a beating as the momentum behind new projects stalls and enthusiasm for domestic fossil fuel production grows.

Across the country, plans to build nuclear plants have hit roadblocks recently—a sharp turn for a sector that just a few years ago was looking forward to a renaissance. These developments come as energy policy becomes increasingly focused on oil and gas.

In recent weeks, the Nuclear Regulatory Commission ruled against a proposed partnership between NRC Energy and Toshiba, citing a law that prohibits control of a U.S. plant by a foreign corporation.

Elsewhere, Duke Energy scuttled plans to construct two nuclear reactors in North Carolina, while California officials warned that two damaged reactors could be shut down permanently if the NRC doesn’t take action to get the plants back online.

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