NJSC Ukrenergo has warned that emails infected with the BlackEnergy virus have been sent out to Ukrainian energy companies on its behalf.

"Hackers have been sending out numerous fake emails on behalf of state-run NJSC Ukrenergo on the rescheduling of public debates on the plan of the development of the integrated power grids. The emails have got an attachment allegedly with the said draft plan, which is most likely infected with the BlackEnergy virus," the press service said.

Ukrenergo once again stressed that the company is not engaged in the mass distribution of emails.

"The Ukrainian division of the Computer Emergency Response Team (CERT) has been informed about the incident," Ukrenergo said.

As was reported, three regional power distribution companies in Ukraine have earlier reported power outages due to the damage done by BlackEnergy.