Baltics only use Russian electricity system to maintain grid frequency
Due to sanctions, Russia has been unable to sell its electricity to the Baltic countries and Finland since mid-May. Currently Estonia, Latvia and Lithuania are only connected to Russia due to being in the same frequency band, which is managed centrally from Moscow. However, as the Baltic states have been trying to maintain a clean balance sheet with Russia since June, they are not required to pay Moscow for frequency management, or energy supplies.
Source: news.err.ee