Natural gas should be priced in a flexible way and it is in the industry's own interest to diversify away from the historical link with oil prices, the European Union energy chief said Wednesday.

Guenther Oettinger's comments -- made at a conference with Russia's energy minister -- come as EU antitrust authorities investigate OAO Gazprom's (GAZP.RS) practice of linking the price of gas in long-term contracts with that of oil.

"It is in the gas industry's own interest to price gas in a flexible way and not just" with an oil link, Oettinger said.