A report by the International Energy Agency says China has overtaken the United States to become the world's top energy consumer.
Provisional figures from the International Energy Agency on Tuesday indicate that China's energy demand has doubled in a decade.
The IEA said China had taken first place because it was hit less hard than the US by the global financial crisis.
But the BBC reports China has challenged the report's findings, saying its figures were unreliable.
The United States has been the biggest consumer of energy for more than 100 years.
But China's rapid economic growth in the past two decades has pushed it into top spot.