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The article explains this. Russia built 4 new gas fired power plants and an LNG import station at a port in Kaliningrad. The enclave is self sufficient now.

Kaliningrad oblast is an exclave of Russia by the way. Enclaves are states like the Vatican - entirely surrounded by one state.

Submarine power lines exist; Baltic and North Sea are full of them.

Would be hilarious if the authorities in Kaliningrad exerted no time and effort to prepare for such an eventuality.

Did you read part of the article or none of it? You clearly didn't read all of it.