"Before 2023, we will have to have clean energy in the Polish electric power system," he told the radio station RMF FM.

"Round about 2023, we will no longer be able to respect very strict environmental norms, especially concerning greenhouse gases."

"The priority for the next 15 years will be to develop renewable electrical energy resources; windpower, biomass and hydro-electric power. But these resources will not suffice," the official added.

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