The targeting of 330 kilovolt transformers in various switching stations has cut some 50% of the distribution capability of Ukraine's electricity network. These transformers weigh up to 200 tons. There are no replacements. You do not buy them at the next corner but will have to order them with years of lead time. As far as I can tell Russia is currently the only producer of transformers of that type.
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The lack of energy is degrading the railway network that brings weapons from the west to the eastern front. It makes redeployment of units from one front section to another very difficult and time consuming. It will give the Russian forces the advantage when they change the Schwerpunkt of their attacks from one corner of the frontline to another.
Another effect of the strikes on the electricity systems and the blackouts in the big cities that follow them is a renewed stream of refugees that will want reach western Europe. It will over time change the public opinion and the political priorities of those countries. If they fail to end the war they will have to carry the burden.
