I don't think Russia determines to carry out strategic strikes based on a random news report in one of the western media network.Russia waited for Kiev to restore some electricity and today struck again on the power grid.
Yesterday the Western media was happy to report that after a year there are street lights again in Kharkiv, and today Russia hit Kharkiv again.
They started this after Crimea bridge was hit initially.
Unable to keep power out for sustained periods (weeks and months) really does miss the point here. For short term blackouts (few days), people can still manage and it won't really affect morale by alot.
Basically Russia is firing it off whenever they have enough stock to saturate AD, and not enough stock to sustain power shortages for long term.