Here’s an article from your preferred news source (AFP) describing events in the last 24 hours. According to the Russian source quoted in the article, Ukraine put out the lights in his city of 330,000. So it appears Ukraine can also turn off the lights with impunity. Oh, and destroy key and very strategic bridges. So is that also a sign that Russia is winning?
What the article says he said. “An electric substation... caught fire after a strike on Belgorod,” Gladkov said on Telegram, adding that it would take “up to four hours” to activate a backup system and restore power.
There is nothing to indicate the fire knocked out power to the entire city, so its pure exaggeration to say it did. In fact, only a few city districts lost power for a few hours.
Likewise, there's no empirical evidence to support your assertion that key bridges were 'destroyed'. I could post images of the Kerch Bridge in use today but at this point it would be casting pearls before swine.