Best I've got is an offhand sentence that Kosovo is using more power than it produces and Serbia refuses to balance that consumption.
https://www.platts.com/latest-news/electric-power/london/kos...
Since the end of the Kosovo war in 1999, the four northern Serb-majority municipalities have not paid Pristina for their energy consumption.
To make up for the shortfall, people from other areas of Kosovo had a percentage added to their bills to pay for the north’s electricity.
In December, the Energy Regulator’s Office announced that electricity bills will be reduced by 3.5 per cent as consumers will no more cover the cost of the four municipalities’ power as they have done for the past 19 years.
Source: I live here.
raising this issue now (rather than earlier in the year) in response to the near-end of the syrian pipeline proxy war, bulgarias mysteriously financed repurchase of it's own gas lines from czech holding co, lavrov and gazprom ceo in belgrade unveiling giant mosaic, etc etc etc...