The Panama Canal, handling 5 percent of world trade, may change how it calculates tolls for ships carrying energy cargoes to boost traffic once a $5.25 billion expansion is complete in 2015.

The authority is consulting canal users about the proposed changes, including meetings with associations representing owners of tankers and dry-cargo vessels in London next month, Panama Canal Authority Administrator Jorge Luis Quijano said. The new fee structure will be announced by February 2014, for implementation by 2015, he said.

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