WARSAW--Poland's top power utility by market value, state-controlled PGE Polska Grupa Energetyczna S.A. (PGE.WA), said its Chief Executive Krzysztof Kilian resigned Monday.

Mr. Kilian quit "due to important reasons, especially related to changes to the management board carried out on Oct. 25," the company said in a news release late Monday.

In October, the supervisory board of the company worth $10.4 billion on the Warsaw bourse dismissed two of Mr. Kilian's close associates, Chief Financial Officer Wojciech Ostrowski and Chief Strategy Officer Boguslawa Matuszewska.

Mr. Kilian was at loggerheads with the government over PGE's role in a 12-billion-zloty ($3.9 billion) extension of a coal-fired power plant in Opole, claiming the project would hurt shareholder value. The government pushed for the plant despite the objections.

Deputy Chief Executive Piotr Szymanek will take the helm of PGE for the time being, the company said.

The Polish state controls nearly 62% of the company.

Write to Patryk Wasilewski at patryk.wasilewski@wsj.com

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