Russian forces have damaged a high-voltage line connecting the former nuclear plant at Chernobyl to the power grid, Ukraine's state energy company has said.
The damage apparently occurred soon after electricity supplies to the facility were restored, but the BBC has not been able to verify this report.
Ukrenergo, Ukraine's state energy company, did not say whether the former nuclear plant had lost all external power as a result of the damage.
The grid operator says a repair crew must be given immediate access to the site, which is occupied by Russian forces, to inspect any damage.