The FBI said Brandon Russell, who helped found Atomwaffen in 2015, was arrested in Florida, after spending four years in prison for possessing bomb-making materials.
The woman, Sarah Beth Clendaniel, was arrested in Maryland where she had also spent time in prison for armed robbery.
Guided by Russell, Clendaniel had planned to acquire a gun and to attack five electrical substations around Baltimore, Maryland, the FBI said.
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In February 2022, three men with neo-Nazi ties pleaded guilty in Columbus, Ohio to plotting to use rifles and explosives to damage power infrastructure in various locations.
In 2021 five men who allegedly had white supremacist beliefs were charged in North Carolina with planning similar attacks.