The full of Ukraine's occidental metropolis of Lviv is without powerfulness aft wide strikes were reported - including successful the superior Kyiv.
Neighbouring state Moldova besides reported "massive" blackouts, though it has not been straight hit.
Lviv's politician urged radical to shelter, portion the caput of the wider Kyiv portion said captious infrastructure and homes had been attacked.
Russia has precocious accrued its attacks connected Ukrainian vigor networks.
More than fractional of Moldova is without electricity, lawman premier curate Andrei Spinu wrote connected Twitter.
"Massive blackout successful Moldova aft today's Russian onslaught connected Ukraine's vigor infrastructure," helium said.
Earlier, an air-raid alert was issued crossed Ukraine, followed by reports of explosions successful a fig of locations.
Lviv mayor, Andriy Sadovy, said children had been taken to shelters with their teachers - and urged parents not to prime them up until the alarm was over.
Shortly earlier the caller reports from Kyiv and Lviv, officials said confederate Ukraine had travel nether renewed assault.
The politician of the Mykolaiv portion warned of "many rockets" arriving from the southbound and east.
In the adjacent Zaporizhzhia region, a newborn babe was killed erstwhile a rocket deed a maternity unit, exigency services said.
Russia was blamed for that attack, but is yet to remark connected immoderate of Wednesday's alleged strikes.
Scheduled and unscheduled blackouts person go communal successful galore parts of Ukraine arsenic a effect of the caller attacks.
Many areas of Ukraine deed by blackouts connected Wednesday were adjacent to neighbouring countries, including Lviv, conscionable 80km (50 miles) from Poland, where a Ukrainian aerial defence rocket killed 2 radical past week.
The towns of Chervonohrad and Yavoriv, besides adjacent to the Polish border, suffered powerfulness cuts.
Moldova besides experienced wide powerfulness cuts arsenic a effect of strikes connected Ukraine connected 15 November, Mr Spinu said. Mobile networks were besides severely affected.
Sergiu Tofilat, a section vigor argumentation analyst, told Moldova's TV8 transmission that the country's vigor supplies relied connected a powerfulness enactment that passed done Transnistria, a breakaway Russian-controlled territory successful Moldova bordering Ukraine, earlier reaching the superior Chisinau. "When determination are bombings successful Ukraine, this enactment is automatically disconnected and we are near without electricity," helium was quoted arsenic saying.
Russian attacks person damaged astir fractional of Ukraine's vigor system, and millions of radical are without powerfulness arsenic temperatures driblet for winter.