I guess it is how you define temporary. Actually, it took years for the Serbs to repair the damage done by the bombing.
Still, military officials confirmed that the objective of using conventional explosives against parts of the power grid was to cause longer-lasting disruptions of electrical service. “It’s fair to say we made the decision that we’re going to attack some elements of it in a way that’s going to take it down for longer than it would have been,” said a senior officer at the Pentagon.
By focusing the attacks more on distribution lines than on main production components, the officer said, the damage should take weeks, not years to repair. He said Yugoslav authorities have access to “auxiliary power supplies for many of these facilities,” but he added that the latest attacks should prove more challenging for the Yugoslav military than the brief outages caused by the filament drops.
The source you are quoting shows that what NATO did was different than what Russia is doing.
NATO went for weeks of disruption at the warm part of the year and the start of summer.
Russia is taking out civilian power and heat and water permanently at the beginning of a deadly winter.