Can you take a look at actual satellite map and tell me where all the unused land you apparently see is?
Pretty much all of the land in Poland is used - either for agriculture, forests or human settlements.
Pretty much all of the land in Poland is used - either for agriculture, forests or human settlements.
So like maybe 99%? Are you say it should be strictly 100% and none of it for solar?
You only need 1% of land for solar to sustain entire population.