The General Secretariat for Civil Protection has warned that the risk of wildfires would remain very high on Wednesday in six of the country's regions: Attica, the northern Aegean, the Peloponnese, mainland Greece, western Greece and eastern Macedonia and Thrace.
The agency said it has briefed regional and local authorities to be on standby for fires in those areas.
Greek authorities said on Thursday they have fully restored electricity to the island resort of Poros, a day after a private helicopter hit its main power line and crashed into the sea, killing all three men on board.
The accident knocked out the island's power supply at the height of the summer tourist season.
The wreckage of a private helicopter that crashed Tuesday has been lifted from the sea off the coast of Poros, an island 60 kilometers south of Athens.
Two Russian passengers, aged 56 and 24, and the 57-year-old Greek pilot died in the crash. Their bodies were recovered Tuesday by Coast Guard divers in shallow water near the island's port.